Patents by Inventor Aruna Zhamu

Aruna Zhamu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20190372151
    Abstract: Provided is graphene-embraced particulate for use as a lithium-ion battery anode active material, wherein the particulate comprises primary particle(s) of an anode active material and multiple sheets of a first graphene material overlapped together to embrace or encapsulate the primary particle(s) and wherein a single or a plurality of graphene-encapsulated primary particles, along with an optional conductive additive, are further embraced or encapsulated by multiple sheets of a second graphene material, wherein the first graphene and the second graphene material is each in an amount from 0.01% to 20% by weight and the optional conductive additive is in an amount from 0% to 50% by weight, all based on the total weight of the particulate. Also provided are an anode and a battery comprising multiple graphene-embraced particulates.
    Type: Application
    Filed: June 1, 2018
    Publication date: December 5, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Aruna Zhamu, Jun Yin, Jen-Hsien Yang, Yu-Sheng Su, Bor Z. Jang
  • Publication number: 20190372099
    Abstract: Provided is a method of producing a mass of graphene-embraced particulates, comprising (A) peeling off graphene sheets from graphite particles and directly or indirectly transferring these graphene sheets to encapsulate primary particles of an anode active material using an energy-impact device, wherein multiple graphene sheets are overlapped together to embrace or encapsulate a primary particle; and (B) combining the resulting graphene-encapsulated primary particles with additional graphene sheets, along with an optional conductive additive, to form graphene-embraced particulates. Also provided are an anode electrode comprising multiple graphene-embraced particulates and a battery comprising such an anode electrode.
    Type: Application
    Filed: June 1, 2018
    Publication date: December 5, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Aruna Zhamu, Jun Yin, Jen-Hsien Yang, Yu-Sheng Su, Bor Z. Jang
  • Publication number: 20190367372
    Abstract: Provided is a process for producing a solid graphene foam-based sealing material. The process comprises: (a) preparing a graphene dispersion having a graphene material dispersed in a liquid medium, which contains an optional blowing agent; (b) dispensing and depositing the graphene dispersion into desired shapes and partially or completely removing the liquid medium from these shapes to form dried graphene shapes; (c) heat treating the dried graphene shapes at a first heat treatment temperature from 50° C. to 3,200° C. at a desired heating rate sufficient to induce volatile gas molecules from the non-carbon elements or to activate the blowing agent for producing the graphene foam; and (d) coating or impregnating the graphene foam with a permeation-resistant binder or matrix material to form the sealing material.
    Type: Application
    Filed: May 31, 2018
    Publication date: December 5, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Yi-jun Lin, Aruna Zhamu, Bor Z. Jang
  • Patent number: 10497968
    Abstract: Provided is a solid state electrolyte composition for a rechargeable lithium battery. The electrolyte composition comprises a lithium ion-conducting polymer matrix or binder and lithium ion-conducting inorganic species that is dispersed in or chemically bonded by the polymer matrix or binder, wherein the lithium ion-conducting inorganic species is 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.
    Type: Grant
    Filed: January 4, 2016
    Date of Patent: December 3, 2019
    Assignee: Global Graphene Group, Inc.
    Inventors: Aruna Zhamu, Bor Z Jang
  • Publication number: 20190363394
    Abstract: A process for producing a lithium battery, comprising: (A) Preparing a plurality of conductive porous layers, wet anode layers, and wet cathode layers; (B) Stacking a desired number of porous layers and wet anode layers in an alternating manner to form an anode electrode having a thickness no less than 100 ?m; (C) Placing a porous separator layer in contact with the anode electrode; (D) Stacking a desired number of porous layers wet cathode layers in an alternating manner to form a cathode electrode in contact with the porous separator, wherein the cathode electrode has a thickness no less than 100 ?m; and (F) Assembling and sealing the anode electrode, separator, and cathode electrode in a housing to produce the lithium battery. The consolidated anode or cathode layer is preferably thicker than 300 more preferably thicker than 400 ?m, and further more preferably greater than 500 ?m.
    Type: Application
    Filed: July 23, 2019
    Publication date: November 28, 2019
    Applicant: Global Graphene Group, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190352806
    Abstract: A process for producing a fabric comprising at least a graphene-based continuous or long fiber, comprising: (a) preparing a graphene dispersion having chemically functionalized graphene sheets dispersed in a fluid; (b) dispensing, depositing, and shearing at least a continuous or long filament of the graphene dispersion onto a substrate, and removing the fluid to form a continuous or long fiber comprising aligned chemically functionally graphene sheets; and (c) inducing chemical reactions between chemical functional groups attached to adjacent graphene sheets to form the graphene fiber; (d) combining the graphene fiber with a plurality of fibers, the same type as or different than the graphene fiber, to form at least one fiber yarn; and (e) combining the at least one fiber yarn and a plurality of fiber yarns, the same type as or different than the at least one fiber yarn, to form the fabric.
    Type: Application
    Filed: May 21, 2018
    Publication date: November 21, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190352186
    Abstract: Provided is a process for producing an integral graphene film, comprising: (a) preparing a graphene dispersion having chemically functionalized graphene sheets dispersed in a fluid medium wherein the graphene sheets contain chemical functional groups attached thereto; (b) dispensing and depositing a wet film of the graphene dispersion onto a supporting substrate, wherein the dispensing and depositing procedure includes mechanical shear stress-induced alignment of the graphene sheets along a film planar direction, and partially or completely removing the fluid medium to form a relatively dried film comprising aligned chemically functionally graphene sheets; and (c) using heat, electromagnetic waves, UV light, or high-energy radiation to induce chemical reactions or chemical bonding between chemical functional groups attached to adjacent chemically functionalized graphene sheets to form the integral graphene film.
    Type: Application
    Filed: May 15, 2018
    Publication date: November 21, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190352185
    Abstract: Provided is an integral graphene film comprising chemically functionalized graphene sheets that are chemically bonded or interconnected with one another having an inter-planar spacing d002 from 0.36 nm to 1.5 nm as determined by X-ray diffraction and a non-carbon element content of 0.1% to 47% by weight, wherein said functionalized graphene sheets are substantially parallel to one another and parallel to an in-plane direction of said integral graphene film and said integral graphene film has a length from 1 cm to 10,000 m, a width from 1 cm to 5 m, a thickness from 2 nm to 500 ?m, and a physical density from 1.5 to 2.25 g/cm3. The integral graphene film typically has a Young's modulus from 20 GPa to 300 GPa or a tensile strength from 1.0 GPa to 3.5 GPa.
    Type: Application
    Filed: May 15, 2018
    Publication date: November 21, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190352805
    Abstract: Provided is a fabric comprising a layer of yarns combined (by weaving, braiding, knitting, or non-woven) to form the fabric wherein the yarns comprise one or a plurality of graphene-based long or continuous fibers. The long or continuous fiber comprises chemically functionalized graphene sheets that are chemically bonded with one another having an inter-planar spacing d002 from 0.36 nm to 1.5 nm as determined by X-ray diffraction and a non-carbon element content of 0.1% to 40% by weight, wherein the functionalized graphene sheets are substantially parallel to one another and parallel to the fiber axis direction and the fiber contains no core-shell structure, have no helically arranged graphene domains, and have a length no less than 0.5 cm and a physical density from 1.5 to 2.25 g/cm3. The graphene fiber typically has a thermal conductivity from 300 to 1,600 W/mK, an electrical conductivity from 600 to 15,000 S/cm, or a tensile strength higher than 1.0 GPa.
    Type: Application
    Filed: May 21, 2018
    Publication date: November 21, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Patent number: 10479690
    Abstract: A process for producing an integrated layer (10 nm to 500 ?m) 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.
    Type: Grant
    Filed: September 15, 2017
    Date of Patent: November 19, 2019
    Assignee: Global Graphene Group, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Patent number: 10483533
    Abstract: Provided is particulate of a cathode active material for a lithium battery, comprising one or a plurality of cathode active material particles being embraced or encapsulated by a thin layer of a high-elasticity polymer having a recoverable tensile strain no less than 5%, a lithium ion conductivity no less than 10?6 S/cm at room temperature, and a thickness from 0.5 nm to 10 ?m, wherein the polymer contains an ultrahigh molecular weight (UHMW) polymer having a molecular weight from 0.5×106 to 9×106 grams/mole. The UHMW polymer is preferably selected from polyacrylonitrile, polyethylene oxide, polypropylene oxide, polyethylene glycol, polyvinyl alcohol, polyacrylamide, poly(methyl methacrylate), poly(methyl ether acrylate), a copolymer thereof, a sulfonated derivative thereof, a chemical derivative thereof, or a combination thereof.
    Type: Grant
    Filed: April 10, 2017
    Date of Patent: November 19, 2019
    Assignee: Global Graphene Group, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Patent number: 10483542
    Abstract: Provided is an aluminum secondary battery comprising an anode, a cathode, and an electrolyte in ionic contact with the anode and the cathode to support reversible deposition and dissolution of aluminum at the anode, wherein the anode contains aluminum metal or an aluminum metal alloy as an anode active material and the cathode comprises a cathode active layer of an exfoliated graphite or carbon material having inter-flake pores from 2 nm to 10 ?m in pore size (preferably from 2 nm to 20 nm, more preferably from 2 nm to 10 nm, and most preferably from 2 to 5 nm). Such an aluminum battery delivers a high energy density, high power density, and long cycle life.
    Type: Grant
    Filed: February 16, 2017
    Date of Patent: November 19, 2019
    Assignee: Global Graphene Group, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Patent number: 10480099
    Abstract: 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. The graphitic fiber contains no core-shell structure, has no helically arranged graphene domains or domain boundaries, and has a porosity level less than 5% by volume, more typically less than 2%, and most typically less than 1% (practically pore-free).
    Type: Grant
    Filed: March 31, 2017
    Date of Patent: November 19, 2019
    Assignee: Global Graphene Group, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190345647
    Abstract: Provided is a process for producing a graphene-based continuous or long fiber, comprising: (a) preparing a graphene dispersion having chemically functionalized graphene sheets dispersed in a fluid medium wherein the graphene sheets contain chemical functional groups attached thereto; (b) dispensing and depositing at least a continuous or long filament of the graphene dispersion onto a supporting substrate, wherein the dispensing and depositing procedure includes mechanical shear stress-induced alignment of the graphene sheets along a filament axis direction, and partially or completely removing the fluid medium to form a continuous or long fiber comprising aligned chemically functionally graphene sheets; and (c) using heat, electromagnetic waves, UV light, or high-energy radiation to induce chemical reactions or chemical bonding between chemical functional groups attached to adjacent chemically functionalized graphene sheets to form the continuous or long graphene fiber.
    Type: Application
    Filed: May 14, 2018
    Publication date: November 14, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190345345
    Abstract: Provided is a method of inhibiting corrosion of a structure or object having a surface, the method comprising (i) coating at least a portion of the surface with a coating suspension comprising multiple graphene sheets coated with a thin film of an anti-corrosive pigment or sacrificial metal having a thickness from 0.5 nm to 1 ?m and a resin binder dispersed or dissolved in a liquid medium; and (ii) at least partially removing the liquid medium from the coating suspension upon completion of the coating step to form a protective coating layer on the surface. Preferably, the protective coating layer contains coated graphene sheets that are aligned to be substantially parallel to one another and parallel to the surface of the structure or object to be protected.
    Type: Application
    Filed: May 8, 2018
    Publication date: November 14, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Fan-Chun Meng, Yi-jun Lin, Shaio-yen Lee, Wen Y. Chiu, Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190348682
    Abstract: One embodiment of the invention is method of inhibiting the shuttle effect by preventing migration of selenium or metal selenide ions from a cathode to an anode of an alkali metal-selenium battery, the method comprising: (a) combining an anode active material layer, a cathode active material layer, an electrically insulating porous separator disposed between the anode active material layer and the cathode active material layer, and electrolyte to form an alkali metal-selenium battery cell, and (b) implementing a porous trapping layer, having a thickness from 5 nm to 100 ?m, between the cathode active material layer and the electrically insulating porous separator to trap selenium or metal selenide ions that are dissolved in the electrolyte from the cathode active material layer. Such a method enables the formation of an alkali metal-selenium battery exhibiting a long cycle life.
    Type: Application
    Filed: May 10, 2018
    Publication date: November 14, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Hui He, Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190345344
    Abstract: Provided is a graphene-based coating suspension comprising multiple graphene sheets, thin film coating of an anti-corrosive pigment or sacrificial metal deposited on graphene sheets, and a binder resin dissolved or dispersed in a liquid medium, wherein the multiple graphene sheets contain single-layer or few-layer graphene sheets selected from a pristine graphene material having essentially zero % of non-carbon elements, or a non-pristine graphene material having 0.001% to 47% by weight of non-carbon elements wherein the non-pristine graphene is 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. The invention also provides a process for producing this coating suspension. Also provided is an object or structure coated at least in part with such a coating.
    Type: Application
    Filed: May 8, 2018
    Publication date: November 14, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Fan-Chun Meng, Yi-jun Lin, Shaio-yen Lee, Wen Y. Chiu, Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190345646
    Abstract: Provided is a graphene-based long fiber comprising chemically functionalized graphene sheets that are chemically bonded with one another having an inter-planar spacing d002 from 0.36 nm to 1.5 nm as determined by X-ray diffraction and a non-carbon element content of 0.1% to 40% by weight, wherein the functionalized graphene sheets are substantially parallel to one another and parallel to the fiber axis direction and the fiber contains no core-shell structure, have no helically arranged graphene domains, and have a length no less than 0.5 cm and a physical density from 1.5 to 2.2 g/cm3. The graphene fiber typically has a thermal conductivity from 300 to 1,600 W/mK, an electrical conductivity from 600 to 15,000 S/cm, or a tensile strength higher than 1.0 GPa.
    Type: Application
    Filed: May 14, 2018
    Publication date: November 14, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190348656
    Abstract: One embodiment of the invention is an alkali metal-selenium battery comprising an anode, a selenium cathode, an electrolyte, an electronically insulating porous separator, and an electronically conducting graphene separator layer comprising a solid graphene foam, paper or fabric that is permeable to lithium ions or sodium ions but is substantially non-permeable to selenium or metal selenide, wherein the graphene separator layer is disposed between the selenium cathode layer and the electronically insulating porous separator layer and the graphene separator layer contains pristine graphene sheets or non-pristine graphene sheets having 0.01% to 20% by weight of non-carbon elements, wherein the non-pristine graphene is selected from graphene oxide, reduced graphene oxide, graphene fluoride, graphene chloride, graphene bromide, graphene iodide, hydrogenated graphene, nitrogenated graphene, boron-doped graphene, nitrogen-doped graphene, chemically functionalized graphene, or a combination thereof.
    Type: Application
    Filed: May 10, 2018
    Publication date: November 14, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Hui He, Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190338146
    Abstract: Provided is a graphene-based aqueous coating suspension comprising multiple graphene sheets, particles of an anti-corrosive pigment or sacrificial metal, and a waterborne binder resin dissolved or dispersed in water, wherein the multiple graphene sheets contain single-layer or few-layer graphene sheets selected from a pristine graphene material having essentially zero % of non-carbon elements, or a non-pristine graphene material having 0.001% to 47% by weight of non-carbon elements wherein the non-pristine graphene is 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 and wherein the coating suspension does not contain a silicate binder or microspheres dispersed therein. Also provided is an object or structure coated at least in part with such a coating.
    Type: Application
    Filed: May 7, 2018
    Publication date: November 7, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Fan-Chun Meng, Yi-jun Lin, Shaio-yen Lee, Wen Y. Chiu, Aruna Zhamu, Bor Z. Jang