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Nanotek Instruments Inc patents


Recent patent applications related to Nanotek Instruments Inc. Nanotek Instruments Inc is listed as an Agent/Assignee. Note: Nanotek Instruments Inc may have other listings under different names/spellings. We're not affiliated with Nanotek Instruments Inc, we're just tracking patents.

ARCHIVE: New 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 | Company Directory "N" | Nanotek Instruments Inc-related inventors


Partially and fully surface-enabled transition metal ion-exchanging energy storage devices

A surface-enabled, metal ion-exchanging battery device comprising a cathode, an anode, a porous separator, and a metal ion-containing electrolyte, wherein the metal ion is selected from aluminum (al), gallium (ga), indium (in), tin (sn), lead (pb), or bismuth (bi), and at least one of the electrodes contains therein a metal ion source prior to the first charge or discharge cycle of the device and at least the cathode comprises a functional material or nanostructured material having a metal ion-capturing functional group or metal ion-storing surface in direct contact with the electrolyte. This energy storage device has a power density significantly higher than that of a lithium-ion battery and an energy density dramatically higher than that of a supercapacitor.. ... Nanotek Instruments Inc

Flexible and shape-conformal rope-shape supercapacitors

Provided is a rope-shaped supercapacitor having a first and second conductive porous electrode in a rod shape, where the pores are filled with an electrolyte and an electrode active material. The pores of the first electrode may contain activated carbon or isolated graphene sheets. ... Nanotek Instruments Inc

Process for producing flexible and shape-conformal rope-shape alkali metal batteries

Provided is a process for producing a rope-shaped alkali metal battery, comprising: (a) providing a first electrode comprising a first conductive porous rod and a first mixture of a first electrode active material and a first electrolyte residing in the pores of the first porous rod; (b) wrapping or encasing a porous separator around the first electrode to form a separator-protected first electrode; (c) providing a second electrode comprising a second conductive porous rod and a second mixture of a second electrode active material and a second electrolyte residing in the pores of the second porous rod; (d) combining the separator-protected first electrode and second electrode to form a braid or a yarn having a twist or spiral electrode; and (e) wrapping or encasing a protective casing or sheath around the braid or yarn to form the rope battery.. . ... Nanotek Instruments Inc

Process for flexible and shape-conformal rope-shape alkali metal-sulfur batteries

Provided is a process for producing a rope-shape alkali metal-sulfur battery, comprising (a) providing a first electrode comprising a conductive porous rod and a mixture of a first electrode active material and a first electrolyte residing in pores of the first porous rod; (b) providing a porous separator wrapping around the first electrode to form a separator-protected first electrode; (c) providing a second electrode comprising a conductive porous rod having a mixture of a second electrode active material and a second electrolyte residing in pores of the second porous rod; (d) combining the separator-protected first electrode and the second electrode to form a braid or a yarn; and (d) encasing the braid or yarn with a protective sheath; wherein one of the electrodes is a cathode containing sulfur or a sulfur compound as a cathode active material and the battery has a length-to-diameter aspect ratio no less than 5.. . ... Nanotek Instruments Inc

Chemical-free production of graphene-wrapped electrode active material particles for battery applications

Provided is a simple, fast, scalable, and environmentally benign method of producing graphene-embraced or encapsulated particles of a battery electrode active material directly from a graphitic material, the method comprising: a) mixing graphitic material particles, multiple particles of an electrode active material, and non-polymeric particles of milling media to form a mixture in an impacting chamber, wherein the graphitic material has never been intercalated, oxidized, or exfoliated and the chamber contains therein no previously produced graphene sheets; b) operating the energy impacting apparatus with a frequency and an intensity for a length of time sufficient for peeling off graphene sheets from the graphitic material and transferring graphene sheets to surfaces of electrode active material particles to produce graphene-embraced active material particles; and c) recovering the graphene-embraced particles from the impacting chamber. Also provided is a mass of the graphene-embraced particles, electrode containing such particles, and battery containing this electrode.. ... Nanotek Instruments Inc

Process for flexible and shape-conformal cable-shape alkali metal-sulfur batteries

Provided is a process for producing a cable-shaped alkali metal-sulfur battery, comprising: (a) providing a first electrode comprising a conductive porous rod and a first mixture of a first electrode active material and a first electrolyte, wherein the first mixture resides in the pores of the porous rod; (b) wrapping around or encasing the first electrode with a porous separator to form a porous separator-protected structure; (c) wrapping around or encasing the porous separator-protected structure with a second electrode which comprises an electrically conductive porous layer and a second mixture of a second electrode active material and a second electrolyte, and the second mixture resides in pores of the porous layer; and (d) wrapping around or encasing the second electrode with a protective casing or sheath to form the battery; wherein either the first or the second electrode contains sulfur or a sulfur compound as a cathode active material.. . ... Nanotek Instruments Inc

Flexible and shape-conformal cable-shape alkali metal-sulfur batteries

Provided is a cable-shaped alkali metal-sulfur battery comprising: (a) a first electrode comprising an electrically conductive porous rod and a first mixture of a first electrode active material and a first electrolyte residing in pores of the porous rod; (b) a porous separator wrapping around the first electrode; (c) a second electrode comprising an electrically conductive porous layer wrapping around or encasing the separator, wherein the porous layer contains a second mixture of a second electrode active material and a second electrolyte residing in pores of the porous layer; and (d) a protective sheath encasing the second electrode; wherein one electrode is a cathode containing sulfur, a sulfur-carbon compound, sulfur-polymer composite, or metal sulfide.. . ... Nanotek Instruments Inc

Lithium-sulfur secondary battery containing gradient electrolyte

A rechargeable lithium-sulfur cell comprising a cathode, an anode, a separator electronically separating the two electrodes, a first electrolyte in contact with the cathode, and a second electrolyte in contact with the anode, wherein the first electrolyte contains a first concentration, c1, of a first lithium salt dissolved in a first solvent when the first electrolyte is brought in contact with the cathode, and the second electrolyte contains a second concentration, c2, of a second lithium salt dissolved in a second solvent when the second electrolyte is brought in contact with the anode, wherein c1 is less than c2. The cell exhibits an exceptionally high specific energy and a long cycle life.. ... Nanotek Instruments Inc

Process for producing flexible and shape-conformal cable-type alkali metal batteries

Provided is a process for producing a cable-shaped alkali metal battery, comprising: (a) providing a first electrode comprising an electrically conductive porous rod having pores and a first mixture of a first electrode active material and a first electrolyte, wherein the first mixture resides in these pores; (b) wrapping around or encasing the first electrode with a porous separator to form a porous separator-protected structure; (c) wrapping around or encasing the porous separator-protected structure with a second electrode which comprises an electrically conductive porous layer, wherein the conductive porous layer contains pores and a second mixture of a second electrode active material and a second electrolyte, and the second mixture resides in the pores of the porous layer; and wrapping around or encasing the second electrode with a protective casing or sheath to form the battery.. . ... Nanotek Instruments Inc

Flexible and shape-conformal cable-type alkali metal batteries

Provided is a cable-shaped alkali metal battery comprising: (a) a first electrode comprising an electrically conductive porous rod having pores and a first mixture of a first electrode active material and a first electrolyte, wherein the first mixture resides in the pores of the porous rod; (b) a porous separator wrapping around the first electrode; (c) a second electrode comprising an electrically conductive porous layer wrapping around or encasing the porous separator, wherein the conductive porous layer contains pores and a second mixture of a second electrode active material and a second electrolyte, and the second mixture resides in the pores of the porous layer; and (d) a protective casing or packing tube wrapping around or encasing the second electrode.. . ... Nanotek Instruments Inc

Continuous process for producing electrodes for supercapacitors having high energy densities

A process for producing a supercapacitor cell, comprising: (a) continuously feeding a conductive porous layer to a cathode material impregnation zone, wherein the conductive porous layer contains interconnected electron-conducting pathways and at least 70% by volume of pores; (b) impregnating a wet cathode active material mixture (containing a cathode active material and an optional conductive additive mixed with a liquid electrolyte) into pores of this porous layer to form a cathode electrode; (c) preparing an anode electrode in a similar manner; and (d) stacking an anode electrode, a porous separator, and a cathode electrode to form the supercapacitor, wherein the anode electrode and/or the cathode electrode has a thickness no less than 100 μm; and/or wherein the anode or cathode active material constitutes an electrode active material loading no less than 7 mg/cm2 in the anode or the cathode.. . ... Nanotek Instruments Inc

Hybrid solid state electrolyte for lithium secondary battery

Provided is a solid state electrolyte for a rechargeable lithium battery, comprising a lithium ion-conducting polymer matrix or binder and a lithium ion-conducting inorganic species dispersed in or chemically bonded by the polymer matrix or binder, wherein the lithium ion-conducting inorganic species is selected from a mixture of a sodium-conducting species or sodium salt and a lithium-conducting species or lithium salt selected from li2co3, li2o, li2c2o4, lioh, lix, roco2li, hcoli, roli, (roco2li)2, (ch2oco2li)2, li2s, lixsoy, or a combination thereof, wherein x=f, cl, i, or br, r=a hydrocarbon group, x=0-1, y=1-4; and wherein the polymer matrix or binder is in an amount from 1% to 99% by volume of the electrolyte composition. Also provided are a process for producing this solid state electrolyte and a lithium secondary battery containing such a solid state electrolyte.. ... Nanotek Instruments Inc

Graphene-protected lead acid batteries

A lead acid battery comprising a negative electrode, a positive electrode comprising lead oxide, an electrolyte in physical contact with the negative electrode and the positive electrode, an optional separator positioned between the negative electrode and the positive electrode, wherein the negative electrode comprises a plurality of particulates of graphene-protected lead or lead alloy, wherein at least one of the particulates is formed of a single or a plurality of graphene sheets and a single or a plurality of fine lead or lead alloy particles having a size smaller than 10 μm, and the graphene sheets and the particles are mutually bonded or agglomerated into the particulate with at least a graphene sheet embracing or wrapping around the particulate, and wherein graphene is in an amount of at least 0.01% but less than 99% by weight based on the total weight of the particulate.. . ... Nanotek Instruments Inc

Graphene oxide-coated graphitic foil and processes for producing same

A graphene oxide-coated graphitic foil, composed of a graphitic substrate or core layer having two opposed primary surfaces and at least a graphene oxide coating layer deposited on at least one of the two primary surfaces, wherein the graphitic substrate layer has a thickness preferably from 0.34 nm to 1 mm, and the graphene oxide coating layer has a thickness preferably from 0.5 nm to 1 mm and an oxygen content of 0.01%-40% by weight based on the total graphene oxide weight. The graphitic substrate layer may be preferably selected from flexible graphite foil, graphene film, graphene paper, graphite particle paper, carbon-carbon composite film, carbon nanofiber paper, or carbon nanotube paper. ... Nanotek Instruments Inc

05/17/18 / #20180138498

Lithium-ion cell having a high-capacity cathode

A method of operating a lithium-ion cell comprising (a) a cathode comprising a carbon or graphitic material having a surface area to capture and store lithium thereon; (b) an anode comprising an anode active material; (c) a porous separator disposed between the two electrodes; (d) an electrolyte in ionic contact with the two electrodes; and (e) a lithium source disposed in at least one of the two electrodes to obtain an open circuit voltage (ocv) from 0.5 volts to 2.8 volts when the cell is made; wherein the method comprises: (a) electrochemically forming the cell from the ocv to either a first lower voltage limit (lvl) or a first upper voltage limit (uvl), wherein the first lvl is no lower than 0.1 volts and the first uvl is no higher than 4.6 volts; and (b) cycling the cell between a second lvl and a second uvl.. . ... Nanotek Instruments Inc

05/17/18 / #20180135200

Heat dissipation system comprising a unitary graphene monolith

A unitary graphene layer or graphene single crystal containing closely packed and chemically bonded parallel graphene planes having an inter-graphene plane spacing of 0.335 to 0.40 nm and an oxygen content of 0.01% to 10% by weight, which unitary graphene layer or graphene single crystal is obtained from heat-treating a graphene oxide gel at a temperature higher than 100° c., wherein the average mis-orientation angle between two graphene planes is less than 10 degrees, more typically less than 5 degrees. The molecules in the graphene oxide gel, upon drying and heat-treating, are chemically interconnected and integrated into a unitary graphene entity containing no discrete graphite flake or graphene platelet. ... Nanotek Instruments Inc

04/19/18 / #20180108909

Battery having a low output voltage

An electrochemical battery cell comprising an anode having a primary anode active material, a cathode, and an ion-conducting electrolyte, wherein the cell has an initial output voltage, vi, measured at 10% depth of discharge (dod), selected from a range from 0.3 volts to 0.8 volts, and a final output voltage vf measured at a dod no greater than 90%, wherein a voltage variation, (vi−vf)/vi, is no greater than±10% and the specific capacity between vi and vf is no less than 100 mah/g or 200 mah/cm3 based on the cathode active material weight or volume, and wherein the primary anode active material is selected from lithium (li), sodium (na), potassium (k), magnesium (mg), aluminum (al), zinc (zn), titanium (ti), manganese (mn), iron (fe), vanadium (v), cobalt (co), nickel (ni), a mixture thereof, an alloy thereof, or a combination thereof.. . ... Nanotek Instruments Inc

04/12/18 / #20180102543

Lithium ion battery anode containing silicon nanowires grown in situ in pores of graphene foam and production process

A process for producing an anode layer, comprising: (a) dispersing catalyst metal-coated si particles, graphene sheets, and an optional blowing agent in a liquid medium to form a graphene/si dispersion; (b) dispensing and depositing the dispersion onto a supporting substrate to form a wet layer and removing the liquid medium from the wet layer to form a dried layer of graphene/si mixture material; and (c) exposing the dried layer to a high temperature environment, from 300° c. To 2,000° c., to induce volatile gas molecules from graphene sheets or to activate the blowing agent for producing the graphene foam and, concurrently, to enable a catalyst metal-catalyzed growth of multiple si nanowires emanated from si particles as a feed material in pores of the foam to form the anode layer; wherein the si nanowires have a diameter of 5-100 nm and a length-to-diameter aspect ratio of at least 5.. ... Nanotek Instruments Inc

03/22/18 / #20180083289

Metal-sulfur battery cathode containing humic acid-derived conductive foam impregnated with sulfur or sulfide

Provided is a sulfur cathode for a metal-sulfur battery, containing a humic acid-derived foam, composed of multiple pores and pore walls, and sulfur or polysulfide impregnated into the pores or deposited on pore walls, wherein the pore walls contain single-layer or few-layer humic acid-derived hexagonal carbon atomic planes or sheets. The few-layer hexagonal carbon atomic planes or sheets have 2-10 layers of stacked hexagonal carbon atomic planes having an inter-plane spacing d002 from 0.3354 nm to 0.60 nm. ... Nanotek Instruments Inc

03/22/18 / #20180083266

Process for metal-sulfur battery cathode containing humic acid-derived conductive foam

Provided is a process for producing a sulfur cathode for a metal-sulfur battery. The process comprises: (a) preparing a humic acid-derived foam or combined humic acid/graphene-derived foam composed of multiple pores and pore walls, wherein the pore walls contain one or a plurality of hexagonal carbon atomic planes; and (b) impregnating the foam with sulfur or sulfide in a form of thin particles or coating, having a diameter or thickness less than 500 nm, which are lodged in the pores or deposited on the pore walls of the foam.. ... Nanotek Instruments Inc

03/01/18 / #20180061517

Highly conductive graphitic films and production process

A process for producing a graphitic film comprising the steps of (a) mixing humic acid (ha) with a carbon precursor polymer and a liquid to form a slurry and forming the slurry into a wet film under the influence of an orientation-inducing stress field to align the ha molecules on a solid substrate; (b) removing the liquid to form a precursor polymer composite film wherein ha occupies a weight fraction of 1% to 99%; (c) carbonizing the precursor polymer composite film at a carbonization temperature of at least 300° c. To obtain a carbonized composite film; and (d) thermally treating the carbonized composite film at a final graphitization temperature higher than 1,500° c. ... Nanotek Instruments Inc

03/01/18 / #20180058782

Unitary graphene-based composite material

A unitary graphene-based integrated heat sink comprising a heat collection member (base) and at least one heat dissipation member (e.g. Fins) integral to the baser, wherein the base is configured to be in thermal contact with a heat source, collects heat therefrom, and dissipates heat through the fins. ... Nanotek Instruments Inc

03/01/18 / #20180057367

Humic acid-derived conductive foams and devices

A humic acid-derived foam composed of multiple pores and pore walls, wherein the pore walls contain single-layer or few-layer humic acid-derived hexagonal carbon atomic planes or sheets, the few-layer hexagonal carbon atomic planes or sheets have 2-10 layers of stacked hexagonal carbon atomic planes having an inter-planar spacing d002 from 0.3354 nm to 0.40 nm as measured by x-ray diffraction, and the single-layer or few-layer hexagonal carbon atomic planes contain 0.01% to 25% by weight of non-carbon elements, and wherein the humic acid is selected from oxidized humic acid, reduced humic acid, fluorinated humic acid, chlorinated humic acid, brominated humic acid, iodized humic acid, hydrogenated humic acid, nitrogenated humic acid, doped humic acid, chemically functionalized humic acid, or a combination thereof.. . ... Nanotek Instruments Inc

03/01/18 / #20180057360

Process for producing humic acid-derived conductive foams

A process for producing a humic acid (ha)-derived foam, comprising: (a) preparing a ha dispersion having multiple ha molecules and an optional blowing agent dispersed in a liquid medium having a blowing agent-to-ha weight ratio from 0/1.0 to 1.0/1.0; (b) dispensing and depositing the ha dispersion onto a surface of a supporting substrate to form a wet ha layer; (c) partially or completely removing liquid medium from the wet ha layer to form a dried ha layer; and (d) heat treating the dried ha layer at a first heat treatment temperature from 80° c. To 3,200° c. ... Nanotek Instruments Inc

02/22/18 / #20180054921

Highly oriented humic acid films and highly conducting graphitic films derived therefrom and devices containing same

A highly oriented humic acid film, comprising multiple humic acid (ha) or chemically functionalized humic acid (cha) sheets that are chemically bonded or merged and are substantially parallel to one another, wherein the film has a thickness from 5 nm to 500 μm, a physical density no less than 1.3 g/cm3, hexagonal carbon planes with an inter-planar spacing d002 of 0.4 nm to 1.3 nm as determined by x-ray diffraction, and a non-carbon element content or oxygen content lower than 5% by weigh.. . ... Nanotek Instruments Inc

02/22/18 / #20180053931

Humic acid-bonded metal foil film current collector and battery and supercapacitor containing same

A humic acid-bonded metal foil current collector in a battery or supercapacitor, comprising: (a) a thin metal foil having two opposed but parallel primary surfaces; and (b) a thin film of humic acid (ha) or a mixture of ha and graphene, having hexagonal carbon planes, wherein ha or both ha and graphene are chemically bonded to at least one of the two primary surfaces; wherein the thin film has a thickness from 10 nm to 10 μm, an oxygen content from 0.01% to 10% by weight, an inter-planar spacing of 0.335 to 0.50 nm between hexagonal carbon planes, a physical density from 1.3 to 2.2 g/cm3, all hexagonal carbon planes being oriented substantially parallel to each other and parallel to the primary surfaces, exhibiting a thermal conductivity greater than 500 w/mk, and/or electrical conductivity greater than 1,500 s/cm when measured alone without the metal foil.. . ... Nanotek Instruments Inc

02/22/18 / #20180053930

Process for producing humic acid-bonded metal foil film current collector

The invention provides a process for producing a highly oriented humic acid (ha) film-bonded metal foil current collector, comprising (a) preparing a dispersion of ha or chemically functionalized ha (cha) dispersed in a liquid medium; (b) depositing the ha or cha dispersion onto a primary surface of a metal foil to form a wet layer under an orientation-inducing stress; (c) removing the liquid medium to form a dried layer having hexagonal carbon planes and an inter-planar spacing d002 of 0.4 nm to 1.3; and (d) heat-treating the dried layer at a temperature higher than 80° c. To produce the current collector wherein the film contains inter-connected, merged or thermally reduced ha or cha sheets that are substantially parallel to each other and are chemically bonded to the metal foil. ... Nanotek Instruments Inc

02/22/18 / #20180050914

Process for producing highly oriented humic acid films and highly conducting graphitic films derived therefrom

A process for producing a highly oriented humic acid (ha) film, comprising: (a) preparing a dispersion of ha or chemically functionalized ha (cha) sheets dispersed in a liquid medium, wherein ha sheets contain an oxygen content higher than 5% by weight or cha sheets contain non-carbon element content higher than 5% by weight; (b) dispensing and depositing ha or cha dispersion onto a surface of a supporting substrate to form a wet layer, under an orientation-inducing stress; (c) removing liquid medium from the wet layer to form a dried ha or cha layer having hexagonal carbon planes and an inter-planar spacing d002 of 0.4 nm to 1.3 nm as determined by x-ray diffraction; and (d) thermally reducing the dried ha or cha layer at a first heat treatment temperature higher than 80° c. For a sufficient period of time to produce the film containing reduced ha or cha.. ... Nanotek Instruments Inc

02/08/18 / #20180040900

Graphene oxide-bonded metal foil thin film current collector and battery and supercapacitor containing same

A graphene oxide-bonded metal foil current collector in a battery or supercapacitor, comprising: (a) a free-standing, non-supported thin metal foil having a thickness from 1 μm to 30 μm and two primary surfaces; and (b) a thin film of graphene oxide chemically bonded to at least one of the two primary surfaces without using a binder or adhesive wherein the primary surface does not contain a metal oxide layer and the thin film of graphene oxide has a thickness from 10 nm to 10 μm, an oxygen content from 0.1% to 10% by weight, an inter-graphene plane spacing of 0.335 to 0.50 nm, a physical density from 1.3 to 2.2 g/cm3, all graphene oxide sheets being oriented substantially parallel to each other and parallel to the primary surfaces, exhibiting a thermal conductivity greater than 500 w/mk, and/or electrical conductivity greater than 1,500 s/cm when measured alone without the thin metal foil.. . ... Nanotek Instruments Inc

02/08/18 / #20180040874

Process for producing graphene oxide-bonded metal foil thin film current collector for a battery or supercapacitor

A process for producing a thin film graphene oxide-bonded metal foil current collector for a battery or supercapacitor, comprising: (a) preparing a graphene oxide gel having graphene oxide (go) molecules dissolved in a fluid medium; (b) depositing a layer of go gel onto at least one of two primary surfaces of a metal foil to form a layer of wet graphene oxide gel, wherein the depositing procedure includes shear-induced thinning of the go gel; (c) partially or completely removing said fluid medium from the deposited wet layer to form a dry film of go having an inter-plane spacing d002 of 0.4 nm to 1.2 nm as determined by x-ray diffraction; and (d) heat treating the dry film of graphene oxide to form the thin film graphene oxide-bonded metal foil current collector at a heat treatment temperature from 80° c. To 2,500° c.. ... Nanotek Instruments Inc

02/08/18 / #20180037458

Method of producing integral 3d humic acid-carbon hybrid foam

Provided is a method of producing an integral 3d humic acid-carbon hybrid foam, comprising: (a) forming a solid shape of humic acid-polymer particle mixture; and (b) pyrolyzing the solid shape of humic acid-polymer particle mixture to thermally reduce humic acid into reduced humic acid sheets and thermally convert polymer into pores and carbon or graphite that bonds the reduced humic acid sheets to form the integral 3d humic acid-carbon hybrid foam.. . ... Nanotek Instruments Inc

02/08/18 / #20180036712

Integral 3d humic acid-carbon hybrid foam and devices containing same

Provided is an integral 3d humic acid-carbon hybrid foam composed of multiple pores and pore walls, wherein pore walls contain single-layer or few-layer humic acid sheets chemically bonded by a carbon material at their edges and have a carbon material-to-humic acid weight ratio from 1/200 to 1/2, wherein the few-layer humic acid sheets have 2-10 layers of stacked substantially hexagonal carbon planes having an inter-plane spacing d002 from 0.3354 nm to 0.40 nm as measured by x-ray diffraction and the single-layer or few-layer humic acid sheets contain 0.01% to 25% by weight of non-carbon elements wherein said humic acid is selected from oxidized humic acid, reduced humic acid, fluorinated humic acid, chlorinated humic acid, brominated humic acid, iodized humic acid, hydrogenated humic acid, nitrogenated humic acid, doped humic acid, chemically functionalized humic acid, or a combination thereof.. . ... Nanotek Instruments Inc

01/18/18 / #20180019071

Supercritical fluid production of graphene-based supercapacitor electrode from coke or coal

Provided is a process for producing a graphene-based supercapacitor electrode from a supply of coke or coal powder, comprising: (a) exposing this powder to a supercritical fluid for a period of time in a pressure vessel to enable penetration of the supercritical fluid into internal structure of the coke or coal; wherein the powder is selected from petroleum coke, coal-derived coke, meso-phase coke, synthetic coke, leonardite, anthracite, lignite coal, bituminous coal, or natural coal mineral powder, or a combination thereof; (b) rapidly depressurizing the supercritical fluid at a fluid release rate sufficient for effecting exfoliation and separation of the coke or coal powder to produce isolated graphene sheets, which are dispersed in a liquid medium to produce a graphene suspension; and (c) shaping and drying the graphene suspension to form the supercapacitor electrode having a specific surface area greater than 200 m2/g.. . ... Nanotek Instruments Inc

01/18/18 / #20180019070

Humic acid-based supercapacitors

A supercapacitor electrode comprising a mixture of graphene sheets and humic acid, wherein humic acid occupies 0.1% to 99% by weight of the mixture and the graphene sheets are selected from a pristine graphene material having essentially zero % of non-carbon elements, or a non-pristine graphene material having 0.001% to 5% by weight of non-carbon elements wherein said non-pristine graphene is selected from graphene oxide, reduced graphene oxide, graphene fluoride, graphene chloride, graphene bromide, graphene iodide, hydrogenated graphene, nitrogenated graphene, chemically functionalized graphene, or a combination thereof; and wherein said mixture has a specific surface area greater than 500 m2/g.. . ... Nanotek Instruments Inc

01/18/18 / #20180019069

Production of graphene-based supercapacitor electrode from coke or coal using direct ultrasonication

Provided is a method of producing graphene-based supercapacitor electrode from a supply of coke or coal powder. The method comprises: (a) dispersing particles of the coke or coal powder in a liquid medium containing therein an optional surfactant or dispersing agent to produce a suspension or slurry, wherein the coke or coal powder is selected from petroleum coke, coal-derived coke, meso-phase coke, synthetic coke, leonardite, anthracite, lignite coal, bituminous coal, or natural coal mineral powder, or a combination thereof; (b) exposing the suspension or slurry to ultrasonication at an energy level for a sufficient length of time to produce a graphene suspension having isolated graphene sheets dispersed in the liquid medium; and (c) shaping and drying the graphene suspension into the supercapacitor electrode in a film, filament, rod, or tube form that is porous and has a specific surface area greater than 200 m2/g.. ... Nanotek Instruments Inc

01/18/18 / #20180016150

Process for producing monolithic film of integrated highly oriented halogenated graphene sheets or molecules

A process for producing an integrated layer (10 nm to 500 μm) of highly oriented halogenated graphene sheets, comprising: (a) preparing a graphene oxide (go) dispersion having go sheets dispersed in a fluid medium; (b) dispensing and depositing a layer of go dispersion onto a surface of a supporting substrate under a shear stress condition that induces orientation of go sheets to form a wet layer of go on the supporting substrate; (c) introducing a halogenating agent into the wet layer of graphene oxide and effecting a chemical reaction between the halogenating agent and go sheets to form a wet layer of halogenated graphene, c6zxoy, wherein z is a halogen element selected from f, cl, br, i, or a combination thereof, x=0.01 to 6.0, y=0 to 5.0, and x+y≦6.0; and (d) removing the fluid medium.. . ... Nanotek Instruments Inc

01/18/18 / #20180016149

Supercritical fluid process for producing graphene from coke or coal

Provided is a process for producing isolated graphene sheets from a supply of coke or coal powder containing therein domains of hexagonal carbon atoms and/or hexagonal carbon atomic interlayers. The process comprises: (a) subjecting the supply of coke or coal powder to a supercritical fluid at a first temperature and a first pressure for a first period of time in a pressure vessel and then (b) rapidly depressurizing the supercritical fluid at a fluid release rate sufficient for effecting exfoliation and separation of the coke or coal powder to produce isolated graphene sheets, wherein the coke or coal powder is selected from petroleum coke, coal-derived coke, meso-phase coke, synthetic coke, leonardite, anthracite, lignite coal, bituminous coal, or natural coal mineral powder, or a combination thereof.. ... Nanotek Instruments Inc

01/11/18 / #20180010028

Single crystal graphene or polycrystalline graphene matrix composite containing carbon-based fillers

A process for producing a unitary graphene matrix composite, the process comprising: (a) preparing a graphene oxide gel having graphene oxide molecules dispersed in a fluid medium, wherein the graphene oxide gel is optically transparent or translucent; (b) mixing a carbon or graphite filler phase in said graphene oxide gel to form a slurry; (c) dispensing said slurry onto a surface of a supporting substrate or a cavity of a molding tool; (d) partially or completely removing the fluid medium from the slurry to form a composite precursor; and (e) heat-treating the composite precursor to form the unitary graphene composite at a temperature higher than 100° c. This composite exhibits a combination of exceptional thermal conductivity, electrical conductivity, mechanical strength, surface hardness, and scratch resistance.. ... Nanotek Instruments Inc

12/28/17 / #20170373322

Alkali metal secondary battery containing a carbon matrix- or carbon matrix composite-based dendrite-intercepting layer

A rechargeable alkali metal battery comprising: (a) an anode comprising an alkali metal layer and a dendrite penetration-resistant layer comprising an amorphous carbon or polymeric carbon matrix, an optional carbon or graphite reinforcement phase dispersed in this matrix, and a lithium- or sodium-containing species that are chemically bonded to the matrix and/or the optional carbon or graphite reinforcement to form an integral layer that prevents dendrite penetration, wherein the lithium- or sodium-containing species is selected from li2co3, li2o, li2c2o4, lioh, lix, roco2li, hcoli, roli, (roco2li)2, (ch2oco2li)2, li2s, lixsoy, na2co3, na2o, na2c2o4, naoh, nax, roco2na, hcona, rona, (roco2na)2, (ch2oco2na)2, na2s, naxsoy, or a combination thereof, wherein x═f, cl, i, or br, r=a hydrocarbon group, x=0-1, y=1-4; (b) a cathode; and (c) a separator and electrolyte component; wherein the dendrite penetration-resistant layer is disposed between the alkali metal layer and the separator.. . ... Nanotek Instruments Inc

12/28/17 / #20170373297

Carbon matrix- and carbon matrix composite-based dendrite-intercepting layer for alkali metal secondary battery

A dendrite penetration-resistant layer for a rechargeable alkali metal battery, comprising an amorphous carbon or polymeric carbon matrix, an optional carbon or graphite reinforcement phase dispersed in this matrix, and a lithium- or sodium-containing species that are chemically bonded to the matrix and/or the optional carbon or graphite reinforcement phase to form an integral layer that prevents dendrite penetration through this integral layer in the alkali metal battery, wherein the lithium- or sodium-containing species is selected from li2co3, li2o, li2c2o4, lioh, lix, roco2li, hcoli, roli, (roco2li)2, (ch2oco2li)2, li2s, lixsoy, na2co3, na2o, na2c2o4, naoh, nax, roco2na, hcona, rona, (roco2na)2, (ch2oco2na)2, na2s, naxsoy, or a combination thereof, wherein x═f, cl, i, or br, r=a hydrocarbon group, x=0−1, y=1−4; and wherein the lithium- or sodium-containing species is derived from an electrochemical decomposition reaction.. . ... Nanotek Instruments Inc

12/28/17 / #20170370009

Electrochemical production of graphene sheets from coke or coal

A method of producing graphene sheets from coke or coal powder, comprising: (a) forming an intercalated coke or coal compound by electrochemical intercalation conducted in an intercalation reactor, which contains (i) a liquid solution electrolyte comprising an intercalating agent; (ii) a working electrode that contains the powder in ionic contact with the liquid electrolyte, wherein the coke or coal powder is selected from petroleum coke, coal-derived coke, meso-phase coke, synthetic coke, leonardite, lignite coal, or natural coal mineral powder; and (iii) a counter electrode in ionic contact with the electrolyte, and wherein a current is imposed upon the working electrode and the counter electrode for effecting electrochemical intercalation of the intercalating agent into the powder; and (b) exfoliating and separating graphene planes from the intercalated coke or coal compound using an ultrasonication, thermal shock exposure, mechanical shearing treatment, or a combination thereof to produce isolated graphene sheets.. . ... Nanotek Instruments Inc

12/28/17 / #20170369320

Direct ultrasonication production of graphene sheets from coke or coal

Provided is a method of producing isolated graphene sheets from a supply of coke or coal powder containing therein domains of hexagonal carbon atoms and/or hexagonal carbon atomic interlayers. The method comprises: (a) dispersing particles of the coke or coal powder in a liquid medium containing therein an optional surfactant or dispersing agent to produce a suspension or slurry, wherein the coke or coal powder is selected from petroleum coke, coal-derived coke, meso-phase coke, synthetic coke, leonardite, anthracite, lignite coal, bituminous coal, or natural coal mineral powder, or a combination thereof; and (b) exposing the suspension or slurry to ultrasonication at an energy level for a sufficient length of time to produce the isolated graphene sheets.. ... Nanotek Instruments Inc

12/07/17 / #20170352869

Graphene-metal hybrid foam-based electrode for an alkali metal battery

Provided is a lithium or sodium metal battery having an anode, a cathode, and a porous separator and/or an electrolyte, wherein the anode contains a graphene-metal hybrid foam composed of multiple pores, pore walls, and a lithium- or sodium-attracting metal residing in the pores; wherein the metal is selected from au, ag, mg, zn, ti, na (or li), k, al, fe, mn, co, ni, sn, v, cr, or an alloy thereof and is in an amount of 0.1% to 90% of the total hybrid foam weight or volume, and the pore walls contain single-layer or few-layer graphene sheets, wherein graphene sheets contain a pristine graphene or non-pristine graphene selected from graphene oxide, reduced graphene oxide, graphene fluoride, graphene chloride, graphene bromide, graphene iodide, hydrogenated graphene, nitrogenated graphene, doped graphene, chemically functionalized graphene, or a combination thereof.. . ... Nanotek Instruments Inc

12/07/17 / #20170352868

Alkali metal battery having an integral 3d graphene-carbon-metal hybrid foam-based electrode

Provided is a lithium or sodium metal battery having an anode, a cathode, and a porous separator and/or an electrolyte, wherein the anode contains an integral 3d graphene-carbon hybrid foam composed of multiple pores, pore walls, and a lithium-attracting metal residing in the pores; wherein the metal is selected from au, ag, mg, zn, ti, na, k, al, fe, mn, co, ni, sn, v, cr, or an alloy thereof and is in an amount of 0.1% to 50% of the total hybrid foam weight or volume, and the pore walls contain single-layer or few-layer graphene sheets chemically bonded by a carbon material having a carbon material-to-graphene weight ratio from 1/200 to 1/2, wherein graphene sheets contain a pristine graphene or non-pristine graphene selected from graphene oxide, reduced graphene oxide, graphene fluoride, graphene chloride, graphene bromide, graphene iodide, hydrogenated graphene, nitrogenated graphene, doped graphene, chemically functionalized graphene, or a combination thereof.. . ... Nanotek Instruments Inc

12/07/17 / #20170352494

Partially surface-mediated lithium ion-exchanging cells and method for operating same

A lithium super-battery cell comprising: (a) a cathode comprising a cathode active material having a surface area to capture or store lithium thereon, wherein the cathode active material is not a functionalized material and does not bear a functional group; (b) an anode comprising an anode current collector; (c) a porous separator disposed between the two electrodes; (d) a lithium-containing electrolyte in physical contact with the two electrodes, wherein the cathode active material has a specific surface area of no less than 100 m2/g being in direct physical contact with the electrolyte to receive lithium ions therefrom or to provide lithium ions thereto; and (e) a lithium source implemented at one or both of the two electrodes prior to a first charge or a first discharge cycle of the cell. This new generation of energy storage device exhibits the best properties of both the lithium ion battery and the supercapacitor.. ... Nanotek Instruments Inc

10/12/17 / #20170294647

Methods for mass-producing silicon nano powder and graphene-doped silicon nano powder

Disclosed is a facile and cost effective method of producing metal-doped nano silicon powder or graphene-doped metal-doped silicon nano powder having a particle size smaller than 100 nm. The method comprises: (a) preparing a silicon precursor/metal precursor/graphene nano composite; (b) mixing the silicon precursor/metal precursor/graphene nano composite with a desired quantity of magnesium; (c) converting the silicon precursor to form a mixture of graphene-doped silicon and a reaction by-product through a thermal and/or chemical reduction reaction; and (d) removing the reaction by-product from the mixture to obtain graphene-doped metal-doped silicon nano powder.. ... Nanotek Instruments Inc

10/05/17 / #20170288211

Elastomer-encapsulated particles of high-capacity anode active materials for lithium batteries

Provided is an anode active material layer for a lithium battery. This layer comprises multiple particulates of an anode active material, wherein at least a particulate is composed of one or a plurality of particles of a high-capacity anode active material being encapsulated by a thin layer of elastomeric material that has a lithium ion conductivity no less than 10−7 s/cm (preferably no less than 10−5 s/cm) at room temperature and an encapsulating shell thickness from 1 nm to 10 μm, and wherein the high-capacity anode active material (e.g. ... Nanotek Instruments Inc

07/27/17 / #20170211208

Process for fabric of continuous graphitic fiber yarns

Multi-functional and high-performing fabric comprising a first layer of yarns woven to form the fabric wherein the yarns comprise at least one unitary graphene-based continuous graphitic fiber comprising at least 90% by weight of graphene planes that are chemically bonded with one another having an inter-planar spacing d002 from 0.3354 nm to 0.4 nm as determined by x-ray diffraction and an oxygen content less than 5% by weight. A majority of the graphene planes in such a continuous graphitic fiber are parallel to one another and parallel to a fiber axis direction. ... Nanotek Instruments Inc

07/13/17 / #20170200996

Flexible asymmetric electrochemical cells using nano graphene platelet as an electrode material

A flexible, asymmetric electrochemical cell comprising: (a) a sheet of graphene paper as first electrode comprising nano graphene platelets having a platelet thickness less than 1 nm, wherein the first electrode has electrolyte-accessible pores; (b) a thin-film or paper-like first separator and electrolyte; and (c) a thin-film or paper-like second electrode which is different in composition than the first electrode; wherein the separator is sandwiched between the first and second electrode to form a flexible laminate configuration. The asymmetric supercapacitor cells with different ngp-based electrodes exhibit an exceptionally high capacitance, specific energy, and stable and long cycle life.. ... Nanotek Instruments Inc

03/16/17 / #20170076833

Graphene oxide-metal nanowire transparent conductive film

A process for producing a transparent conductive film, comprising (a) providing a graphene oxide gel; (b) dispersing metal nanowires in the graphene oxide gel to form a suspension; (c) dispensing and depositing the suspension onto a substrate; and (d) removing the liquid medium to form the film. The film is composed of metal nanowires and graphene oxide with a metal nanowire-to-graphene oxide weight ratio from 1/99 to 99/1, wherein the metal nanowires contain no surface-borne metal oxide or metal compound and the film exhibits an optical transparence no less than 80% and sheet resistance no higher than 300 ohm/square. ... Nanotek Instruments Inc

03/16/17 / #20170073834

Process for unitary graphene layer or graphene single crystal

A unitary graphene layer or graphene single crystal containing closely packed and chemically bonded parallel graphene planes having an inter-graphene plane spacing of 0.335 to 0.40 nm and an oxygen content of 0.01% to 10% by weight, which unitary graphene layer or graphene single crystal is obtained from heat-treating a graphene oxide gel at a temperature higher than 100° c., wherein the average mis-orientation angle between two graphene planes is less than 10 degrees, more typically less than 5 degrees. The molecules in the graphene oxide gel, upon drying and heat-treating, are chemically interconnected and integrated into a unitary graphene entity containing no discrete graphite flake or graphene platelet. ... Nanotek Instruments Inc








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