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: 20200028204
    Abstract: Provided is a method of producing a multivalent metal-ion 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 a multivalent metal, selected from Ni, Zn, Be, Mg, Ca, Ba, La, Ti, Ta, Zr, Nb, Mn, V, Co, Fe, Cd, Cr, Ga, In, or a combination thereof, at the anode, wherein the anode contains the multivalent metal or its alloy as an anode active material and the cathode comprises a cathode active layer of graphitic carbon particles or fibers that are coated with a protective material. Such a metal-ion battery delivers a high energy density, high power density, and long cycle life.
    Type: Application
    Filed: August 22, 2019
    Publication date: January 23, 2020
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20200028158
    Abstract: Provided is a simple, fast, scalable, and environmentally benign method of producing graphene-stabilized lithium metal particles, comprising: a) mixing particles of a graphitic material, polymer-coated particles of a lithium-attracting seed material, and optional ball-milling media to form a mixture in an impacting chamber of an energy impacting apparatus; b) operating the apparatus with a frequency and an intensity for a length of time sufficient for peeling off graphene sheets from particles of graphitic material and transferring the peeled graphene sheets to surfaces of the polymer-coated particles and fully encapsulate the particles to produce graphene-encapsulated polymer-coated solid particles; c) recovering the graphene-encapsulated polymer-coated solid particles from the impacting chamber and removing the polymer from the particles to produce graphene balls, wherein the graphene ball has a graphene shell, a lithium-attracting seed material particle and a hollow space; and d) impregnating the graphene
    Type: Application
    Filed: July 23, 2018
    Publication date: January 23, 2020
    Applicant: Nanotek Instruments, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20200028178
    Abstract: Provided is a rechargeable alkali metal-sulfur cell comprising an anode layer, an electrolyte and a porous separator, a cathode layer, and a discrete anode-protecting layer disposed between the anode layer and the separator and/or a discrete cathode-protecting layer disposed between the separator and the cathode active material layer; wherein the anode-protecting layer or cathode-protecting layer comprises a conductive sulfonated elastomer composite having from 0.01% to 40% by weight of a conductive reinforcement material and from 0.01% to 40% by weight of an electrochemically stable inorganic filler dispersed in a sulfonated elastomeric matrix material and the protective layer has a thickness from 1 nm to 50 ?m, a fully recoverable tensile strain from 2% to 500%, a lithium ion conductivity from 10?7 S/cm to 5×10?2 S/cm, and an electrical conductivity from 10?7 S/cm to 100 S/cm.
    Type: Application
    Filed: August 29, 2018
    Publication date: January 23, 2020
    Applicant: Nanotek Instruments, Inc.
    Inventors: Hui He, Aruna Zhamu, Bor Z. Jang
  • Publication number: 20200028147
    Abstract: Provided is a method of improving fast-chargeability of a lithium secondary battery containing an anode, a cathode, a porous separator disposed between the anode and the cathode, and an electrolyte, wherein the method comprises packing particles of an anode active material to form an anode active material layer having interstitial spaces and disposing a lithium ion reservoir in the interstitial spaces, configured to receive lithium ions from the cathode through the porous separator when the battery is charged and to enable the lithium ions to enter the particles of anode active material in a time-delayed manner.
    Type: Application
    Filed: July 18, 2018
    Publication date: January 23, 2020
    Applicant: Nanotek Instruments, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20200020975
    Abstract: Provided is a surface-stabilized anode active material particulate (for use in a lithium battery), comprising: (a) one or a plurality of prelithiated or un-prelithiated anode active material particles (with or without a coating of carbon, graphene, or ion-conducting polymer); (b) a protecting polymer layer that wraps around, embraces or encapsulates the one or plurality of anode active material particles, wherein the protecting polymer layer has a thickness from 0.
    Type: Application
    Filed: September 24, 2019
    Publication date: January 16, 2020
    Applicant: Global Graphene Group, Inc.
    Inventors: Baofei Pan, Aruna Zhamu, Bor Z. Jang
  • Patent number: 10535880
    Abstract: Provided is a rope-shaped alkali metal battery comprising: (a) a first electrode comprising a first conductive porous rod having pores and a first mixture of a first electrode active material and a first electrolyte residing in the pores of the first porous rod; (b) a porous separator wrapping around or encasing the first electrode to form a separator-protected first electrode; (c) a second electrode comprising a second conductive porous rod having pores and a second mixture of a second electrode active material and a second electrolyte residing in the pores of the second porous rod; wherein the separator-protected first electrode and second electrode are combined to form a braid or a yarn having a twist or spiral electrode; and (d) a protective casing or sheath wrapping around or encasing the braid or yarn.
    Type: Grant
    Filed: December 28, 2016
    Date of Patent: January 14, 2020
    Assignee: Global Graphene Group, Inc.
    Inventors: Aruna Zhamu, Hui He, Baofei Pan, Yu-Sheng Su, Bor Z Jang
  • Patent number: 10535892
    Abstract: Provided is an alkali metal cell comprising: (a) a quasi-solid cathode containing 30% to 95% by volume of a cathode active material, about 5% to about 40% by volume of a first electrolyte containing an alkali salt dissolved in a solvent and an ion-conducting polymer dissolved, dispersed in or impregnated by a solvent, and about 0.01% to about 30% by volume of a conductive additive wherein the conductive additive, containing conductive filaments, forms a 3D network of electron-conducting pathways such that the quasi-solid electrode has an electrical conductivity from about 10?6 S/cm to about 300 S/cm; (b) an anode; and (c) an ion-conducting membrane or porous separator disposed between the anode and the quasi-solid cathode; wherein the quasi-solid cathode has a thickness from 200 ?m to 100 cm and a cathode active material having an active material mass loading greater than 10 mg/cm2.
    Type: Grant
    Filed: May 30, 2017
    Date of Patent: January 14, 2020
    Assignee: Global Graphene Group, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20200009846
    Abstract: Provided is a process for producing a graphene foam laminate for use as a sealing material, the process comprising (a) providing a layer of graphene foam; and (b) laminating the layer of graphene foam with one layer of permeation-resistant polymer to form a two-layer laminate or with two layers of permeation-resistant polymer to form a three-layer laminate wherein the graphene foam layer is sandwiched between the two permeation-resistant polymer layers. The two permeation-resistant polymer layers can be the same or different in composition. The product is a new, novel, unexpected, and patently distinct class of highly conducting, elastic, thermally stable, and strong sealing materials.
    Type: Application
    Filed: July 9, 2018
    Publication date: January 9, 2020
    Applicant: Nanotek Instruments, Inc.
    Inventors: Yi-jun Lin, Aruna Zhamu, Bor Z. Jang
  • Publication number: 20200010695
    Abstract: Provided is a humic acid-based coating suspension comprising humic acid, particles of an anti-corrosive pigment or sacrificial metal, and a binder resin dissolved or dispersed in a liquid medium, wherein the humic acid has a weight fraction from 0.1% to 50% based on the total coating suspension weight excluding the liquid medium. Also provided is an object or structure coated at least in part with such a coating.
    Type: Application
    Filed: July 9, 2018
    Publication date: January 9, 2020
    Applicant: Nanotek Instruments, Inc.
    Inventors: Yi-jun Lin, Aruna Zhamu, Bor Z. Jang
  • Publication number: 20200010748
    Abstract: Provided is a graphene foam laminate for use as a sealing material, comprising: (a) a layer of graphene foam having a thickness from 100 nm to 10 cm and comprising pores and pore walls having a 3D network of interconnected graphene planes or graphene sheets; and (b) a permeation-resistant polymer layer disposed on a primary surface of the graphene foam to form a two-layer laminate or two permeation-resistant polymer layers disposed on the two primary surfaces of the graphene foam to form a three-layer sandwich laminate, wherein the permeation-resistant polymer layer has a thickness from 10 nm to 1 cm.
    Type: Application
    Filed: July 9, 2018
    Publication date: January 9, 2020
    Applicant: Nanotek Instruments, Inc.
    Inventors: Yi-jun Lin, Aruna Zhamu, Bor Z. Jang
  • Patent number: 10526204
    Abstract: Provided is a method of producing isolated graphene sheets directly from a carbon/graphite precursor. The method comprises: (a) providing a mass of aromatic molecules wherein the aromatic molecules are selected from petroleum heavy oil or pitch, coal tar pitch, a polynuclear hydrocarbon, or a combination thereof; (b) heat treating this mass and using chemical or mechanical means to form graphene domains dispersed in a disordered matrix of carbon or hydrocarbon molecules, wherein the graphene domains are each composed of from 1 to 30 planes of hexagonal carbon atoms or fused aromatic rings having a length or width from 5 nm to 20 ?m and an inter-graphene space between two planes of hexagonal carbon atoms or fused aromatic rings no less than 0.4 nm; and (c) separating and isolating the planes of hexagonal carbon atoms or fused aromatic rings to recover graphene sheets from the disordered matrix.
    Type: Grant
    Filed: September 11, 2017
    Date of Patent: January 7, 2020
    Assignee: Global Graphene Group, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20200002506
    Abstract: Provided is a process for producing a polymer composite film, comprising the steps of: (a) mixing a phthalocyanine compound with a polymer or its precursor and a liquid to form a slurry and forming the slurry into a wet film on a solid substrate, wherein the polymer is preferably selected from the group consisting of polyimide, polyamide, polyoxadiazole, polybenzoxazole, polybenzobisoxazole, polythiazole, polybenzothiazole, polybenzobisthiazole, poly(p-phenylene vinylene), polybenzimidazole, polybenzobisimidazole, and combinations thereof; and (b) removing the liquid from the wet film and, in some embodiments, converting the precursor to the polymer to form the polymer composite film comprising from 0.1% to 50% by weight of the phthalocyanine compound dispersed in the polymer.
    Type: Application
    Filed: July 2, 2018
    Publication date: January 2, 2020
    Applicant: Nanotek Instruments, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20200002505
    Abstract: A black-color polymer composite film comprising a phthalocyanine compound dispersed in a polymer selected from the group consisting of polyimide, polyamide, polyoxadiazole, polybenzoxazole, polybenzobisoxazole, polythiazole, polybenzothiazole, polybenzobisthiazole, poly(p-phenylene vinylene), polybenzimidazole, polybenzobisimidazole, and combinations thereof, wherein the phthalocyanine compound occupies a weight fraction of 0.1% to 50% based on the total polymer composite weight. Preferably, the phthalocyanine compound is selected from copper phthalocyanine, zinc phthalocyanine, tin phthalocyanine, iron phthalocyanine, lead phthalocyanine, nickel phthalocyanine, vanadyl phthalocyanine, fluorochromium phthalocyanine, magnesium phthalocyanine, manganous phthalocyanine, dilithium phthalocyanine, aluminum phthalocyanine chloride, cadmium phthalocyanine, chlorogallium phthalocyanine, cobalt phthalocyanine, silver phthalocyanine, a metal-free phthalocyanine, or a combination thereof.
    Type: Application
    Filed: July 2, 2018
    Publication date: January 2, 2020
    Applicant: Nanotek Instruments, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190393485
    Abstract: Provided is a lithium secondary battery, comprising a cathode, an anode, and a porous separator or electrolyte, wherein the anode comprises: (a) an anode active layer containing a layer of lithium or lithium alloy, in a form of a foil, coating, or multiple particles aggregated together, as an anode active material; (b) a first anode-protecting layer having a thickness from 1 nm to 100 ?m, a specific surface area greater than 50 m2/g and comprising a thin layer of electron-conducting material selected from graphene sheets, carbon nanotubes, carbon nanofibers, carbon or graphite fibers, expanded graphite flakes, metal nanowires, conductive polymer fibers, or a combination thereof, and (c) a second anode-protecting layer having a thickness from 1 nm to 100 ?m and comprising an elastomer having a fully recoverable tensile elastic strain from 2% to 1,000% and a lithium ion conductivity from 10?8 S/cm to 5×10?2 S/cm.
    Type: Application
    Filed: September 4, 2018
    Publication date: December 26, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Hui He, Baofei Pan, Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190393544
    Abstract: Provided is a lithium-selenium battery, comprising a cathode, an anode, and a porous separator/electrolyte assembly, wherein the anode comprises an anode active layer containing lithium or lithium alloy as an anode active material, and the cathode comprises a cathode active layer comprising a selenium-containing material, wherein an anode-protecting layer is disposed between the anode active layer and the separator/electrolyte and/or a cathode-protecting layer is disposed between the cathode active layer and the separator/electrolyte; the protecting layer contains a composite comprising from 0.01% to 50% by weight of a conductive reinforcement material dispersed in a sulfonated elastomeric matrix material and has a thickness from 1 nm to 100 ?m, a fully recoverable tensile strain from 2% to 500%, a lithium ion conductivity from 10?7 S/cm to 5×10?2 S/cm, and an electrical conductivity from 10?7 S/cm to 100 S/cm.
    Type: Application
    Filed: June 25, 2018
    Publication date: December 26, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190393486
    Abstract: The invention provides a method of improving the anode stability and cycle-life of a lithium metal secondary battery. The method comprises implementing two anode-protecting layers between an anode active material layer and an electrolyte/separator assembly. These two layers comprise (a) a first anode-protecting layer having a thickness from 1 nm to 100 ?m, a specific surface area greater than 50 m2/g and comprising a thin layer of electron-conducting material selected from graphene sheets, carbon nanotubes, carbon nanofibers, carbon or graphite fibers, expanded graphite flakes, metal nanowires, conductive polymer fibers, or a combination thereof; and (b) a second anode-protecting layer having a thickness from 1 nm to 100 ?m and comprising an elastomer having a fully recoverable tensile elastic strain from 2% to 1,000% (preferably >10%) and a lithium ion conductivity from 10?8 S/cm to 5×10?2 S/cm.
    Type: Application
    Filed: September 4, 2018
    Publication date: December 26, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Hui He, Baofei Pan, Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190393482
    Abstract: The invention provides a method of improving the anode stability and cycle-life of a lithium metal secondary battery. The method comprises implementing two anode-protecting layers between an anode active material layer and an electrolyte or electrolyte/separator assembly. These two layers comprise (a) a first anode-protecting layer having a thickness from 1 nm to 100 ?m (preferably <1 ?m and more preferably <100 nm) and comprising a lithium ion-conducting material having a lithium ion conductivity from 10?8 S/cm to 5×10?2 S/cm; and (b) a second anode-protecting layer having a thickness from 1 nm to 100 ?m and comprising an elastomer having a fully recoverable tensile elastic strain from 2% to 1,000% (preferably >10% more preferably >100%) and a lithium ion conductivity from 10?8 S/cm to 5×10?2 S/cm.
    Type: Application
    Filed: September 6, 2018
    Publication date: December 26, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Hui He, Baofei Pan, Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190393495
    Abstract: Provided is a lithium secondary battery, comprising a cathode, an anode, and a porous separator or electrolyte, wherein the anode comprises: (a) an anode active layer containing a layer of lithium or lithium alloy, in a form of a foil, coating, or multiple particles aggregated together, as an anode active material; and (b) an anode-protecting layer of a conductive sulfonated elastomer composite, disposed between the anode active layer and the separator/electrolyte; wherein the composite has from 0.01% to 40% by weight of a conductive reinforcement material and from 0.01% to 40% by weight of an inorganic filler dispersed in a sulfonated elastomeric matrix material and the protecting layer has a thickness from 1 nm to 100 ?m, a fully recoverable tensile strain from 2% to 500%, a lithium ion conductivity from 10?7 S/cm to 5×10?2 S/cm, and an electrical conductivity from 10?7 S/cm to 100 S/cm.
    Type: Application
    Filed: August 27, 2018
    Publication date: December 26, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Hui He, Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190393496
    Abstract: The invention provides a method of improving the cycle-life of a lithium metal secondary battery. The method comprises implementing an anode-protecting layer between an anode active material layer and a porous separator/electrolyte, wherein the anode-protecting layer or cathode-protecting layer comprises a conductive sulfonated elastomer composite having from 0.01% to 40% by weight of a conductive reinforcement material and from 0.01% to 40% by weight of an electrochemically stable inorganic filler dispersed in a sulfonated elastomeric matrix material and the protecting layer has a thickness from 1 nm to 100 ?m, a fully recoverable tensile strain from 2% to 500%, a lithium ion conductivity from 10?7 S/cm to 5×10?2 S/cm, and an electrical conductivity from 10?7 S/cm to 100 S/cm when measured at room temperature.
    Type: Application
    Filed: August 27, 2018
    Publication date: December 26, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Hui He, Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190393508
    Abstract: The invention provides a method of improving the cycle-life of a lithium metal secondary battery. The method comprises implementing an anode-protecting layer between an anode active material layer and a porous separator/electrolyte, wherein the anode-protecting layer or cathode-protecting layer comprises a conductive sulfonated elastomer composite having from 0.01% to 50% by weight of a conductive reinforcement material dispersed in a sulfonated elastomeric matrix material and the protecting layer has a thickness from 1 nm to 100 ?m, a fully recoverable tensile strain from 2% to 500%, a lithium ion conductivity from 10?7 S/cm to 5×10?2 S/cm, and an electrical conductivity from 10?7 S/cm to 100 S/cm when measured at room temperature.
    Type: Application
    Filed: June 21, 2018
    Publication date: December 26, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang