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).

  • Patent number: 10985365
    Abstract: Provided is a rechargeable alkali metal-sulfur cell comprising: (a) an anode; (b) a cathode active material layer comprising a sulfur-containing material; and (c) an electrolyte or an electrolyte/separator layer; wherein the anode comprises (i) an anode active material layer; (ii) a first anode-protecting layer, in physical contact with the anode active material layer, having a thickness from 1 nm to 100 ?m and comprising a thin layer of an electron-conducting material having a specific surface area greater than 50 m2/g; and (iii) a second anode-protecting layer in physical contact with the first 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 when measure at room temperature.
    Type: Grant
    Filed: September 10, 2018
    Date of Patent: April 20, 2021
    Assignee: Global Graphene Group, Inc.
    Inventors: Hui He, Aruna Zhamu, Bor Z. Jang
  • Patent number: 10985376
    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: Grant
    Filed: August 29, 2018
    Date of Patent: April 20, 2021
    Assignee: Global Graphene Group, Inc.
    Inventors: Hui He, Aruna Zhamu, Bor Z. Jang
  • Patent number: 10985373
    Abstract: Provided is cathode active material layer for a lithium battery. The cathode active material layer comprises multiple cathode active material particles and an optional conductive additive that are bonded together by a binder comprising a high-elasticity polymer having a recoverable tensile strain from 5% to 700% (preferably from 10% to 100%) when measured without an additive or reinforcement in said polymer and a lithium ion conductivity no less than 10?5 S/cm (preferably and typically from 1.0×10?5 S/cm to 5×10?2 S/cm) at room temperature.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: April 20, 2021
    Assignee: Global Graphene Group, Inc.
    Inventors: Baofei Pan, Hui He, Aruna Zhamu, Bor Z. Jang
  • Publication number: 20210111391
    Abstract: Provided is a bi-polar electrode for a battery, the electrode comprising: (a) a current collector comprising a conductive material foil (e.g. metal foil) having a thickness from 10 nm to 100 ?m and two opposed, parallel primary surfaces, wherein one or both of the primary surfaces is coated with a layer of exfoliated graphite or expanded graphite material having a thickness from 10 nm to 50 ?m; and (b) a negative electrode layer and a positive electrode layer respectively disposed on the two sides of the current collector, each in physical contact with the layer of exfoliated graphite or expanded graphite material or directly with a primary surface of the conductive material foil (if not coated with a exfoliated or expanded graphite layer). Also provided is a battery comprising multiple (e.g. 2-300) bipolar electrodes internally connected in series. There can be multiple bi-polar electrodes that are connected in parallel.
    Type: Application
    Filed: October 10, 2019
    Publication date: April 15, 2021
    Applicant: Nanotek Instruments, Inc.
    Inventors: Evan House, Aruna Zhamu, Bor Z. Jang
  • Publication number: 20210111403
    Abstract: 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.
    Type: Application
    Filed: December 15, 2020
    Publication date: April 15, 2021
    Applicant: Global Graphene Group, Inc.
    Inventors: Yu-Sheng Su, Minjie Li, Hui He, Qing Fang, Aruna Zhamu, Bor Z. Jang
  • Patent number: 10978744
    Abstract: The invention provides a method of improving the anode stability and cycle-life of an alkali metal-sulfur. 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, in physical contact with the anode active material layer, having a thickness from 1 nm to 100 ?m and comprising a thin layer of an electron-conducting material having a specific surface area greater than 50 m2/g; and (b) a second anode-protecting layer in physical contact with the first 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 when measure at room temperature.
    Type: Grant
    Filed: September 10, 2018
    Date of Patent: April 13, 2021
    Assignee: Global Graphene Group, Inc.
    Inventors: Hui He, Aruna Zhamu, Bor Z. Jang
  • Patent number: 10978698
    Abstract: Provided is a method of producing a rechargeable alkali metal-sulfur cell, comprising: (a) providing an anode layer; (b) providing particulates comprising primary particles of a sulfur-containing material encapsulated or embraced by a thin layer of a conductive sulfonated elastomer composite, wherein the conductive sulfonated elastomer composite comprises from 0% to 50% by weight of a conductive reinforcement material dispersed in a sulfonated elastomeric matrix material, and the conductive sulfonated elastomer composite has a thickness from 1 nm to 10 ?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; (c) forming the particulates, a resin binder, and an optional conductive additive into a cathode layer; and (d) combining the anode layer, the cathode layer, an optional porous separator, and an electrolyte to form the alkali metal-sulfur cell.
    Type: Grant
    Filed: June 15, 2018
    Date of Patent: April 13, 2021
    Assignee: Global Graphene Group, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Patent number: 10971722
    Abstract: A method of producing a powder mass for a lithium battery, comprising: (a) mixing graphene sheets and a sulfonated elastomer or its precursor in a liquid medium or solvent to form a suspension; (b) dispersing a plurality of particles of an anode active material in the suspension to form a slurry; and (c) dispensing the slurry and removing the solvent and/or polymerizing or curing the precursor to form the powder mass comprising multiple particulates, wherein at least one of the particulates is composed of one or a plurality of the particles encapsulated by a thin layer of a sulfonated elastomer/graphene composite having a thickness from 1 nm to 10 ?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: Grant
    Filed: March 2, 2018
    Date of Patent: April 6, 2021
    Assignee: Global Graphene Group, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Patent number: 10971723
    Abstract: Provided is a method of manufacturing an alkali metal-selenium cell, comprising: (a) providing a cathode; (b) providing an alkali metal anode; and (c) combining the anode and the cathode and adding an electrolyte in ionic contact with the anode and the cathode to form the cell; wherein the cathode contains multiple particulates of a selenium-containing material selected from selenium, a selenium-carbon hybrid, selenium-graphite hybrid, selenium-graphene hybrid, conducting polymer-selenium hybrid, a metal selenide, a Se alloy or mixture with Sn, Sb, Bi, S, or Te, a selenium compound, or a combination thereof and wherein at least one of the particulates comprises one or a plurality of selenium-containing material particles being embraced or encapsulated by a thin layer of an elastomer having a recoverable tensile strain from 5% to 1000%, a lithium ion conductivity no less than 10?7 S/cm, and a thickness from 0.5 nm to 10 ?m.
    Type: Grant
    Filed: April 16, 2018
    Date of Patent: April 6, 2021
    Assignee: Global Graphene Group, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20210098790
    Abstract: Provided is an anode active material layer for a lithium battery. The anode active material layer comprises multiple anode active material particles and an optional conductive additive that are bonded together by a binder comprising a high-elasticity polymer having a recoverable or elastic tensile strain no less than 5% when measured without an additive or reinforcement in the polymer. The high-elasticity polymer contains a cross-linked network of polymer chains. The anode active material preferably has a specific lithium storage capacity greater than 372 mAh/g (e.g. Si, Ge, Sn, SnO2, Co3O4, etc.).
    Type: Application
    Filed: October 7, 2020
    Publication date: April 1, 2021
    Inventors: Hui He, Aruna Zhamu, Bor Z. Jang
  • Patent number: 10964951
    Abstract: Provided is a lithium secondary battery, comprising a cathode, an anode, and a porous separator or electrolyte disposed between the cathode and the anode, 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) a thin layer of a high-elasticity polymer, disposed between the anode active layer and the porous separator or electrolyte; the polymer having a recoverable tensile strain from 2% to 1,500%, a lithium ion conductivity no less than 10?6 S/cm (typically up to 5×10?2 S/cm) at room temperature, and a thickness from 1 nm to 10 ?m, wherein the high-elasticity polymer contains a polyrotaxane network having a rotaxane structure or a polyrotaxane structure at a crosslink point of the polyrotaxane network.
    Type: Grant
    Filed: August 14, 2017
    Date of Patent: March 30, 2021
    Assignee: Global Graphene Group, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Patent number: 10964936
    Abstract: Provided is an anode active material electrode for a lithium battery. This electrode layer comprises multiple particulates of an anode active material, wherein at least a particulate is composed of one or a plurality of particles of an anode active material being encapsulated by a thin layer of sulfonated elastomer/graphene composite having from 0.01% to 50% by weight of graphene sheets dispersed in a sulfonated elastomeric matrix material, wherein the encapsulating shell composite has a thickness from 1 nm to 10 ?m, 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. The anode active material is preferably selected from Si, Ge, Sn, SnO2, SiOx, Co3O4, Mn3O4, etc., which has a specific capacity of lithium storage greater than 372 mAh/g (the theoretical lithium storage limit of graphite).
    Type: Grant
    Filed: March 2, 2018
    Date of Patent: March 30, 2021
    Assignee: Global Graphene Group, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20210091383
    Abstract: Provided is a bi-polar electrode for a battery, wherein the bi-polar electrode comprises: (a) a current collector comprising a conductive material foil (e.g. metal foil) having a thickness from 10 nm to 100 ?m and two opposed, parallel primary surfaces, wherein one or both of the primary surfaces is coated with a layer of graphene material having a thickness from 10 nm to 10 ?m; and (b) a negative electrode layer and a positive electrode layer respectively disposed on the two sides of the current collector, each in physical contact with the layer of graphene material or directly with a primary surface of the conductive material foil (if not coated with a graphene material layer). Also provided is a battery comprising multiple (e.g. 2-300) bipolar electrodes internally connected in series. There can be multiple bi-polar electrodes that are connected in parallel.
    Type: Application
    Filed: September 24, 2019
    Publication date: March 25, 2021
    Applicant: Nanotek Instruments, Inc.
    Inventors: Evan House, Aruna Zhamu, Bor Z. Jang
  • Publication number: 20210091368
    Abstract: Provided is a process for producing a bi-polar electrode for a battery or capacitor, the process comprising: (a) providing a conductive material foil having a thickness from 10 nm to 100 ?m and two opposing parallel primary surfaces, and coating one or both of the primary surfaces with a layer of graphene material having a thickness from 5 nm to 50 ?m to form a graphene-coated current collector; and (b) depositing a negative electrode layer and a positive electrode layer respectively onto two opposing primary surfaces of the graphene-coated current collector, wherein the negative electrode layer is in physical contact with the layer of graphene material or in direct contact with a primary surface of the conductive material foil and the positive electrode layer is in physical contact with the layer of graphene material or directly with the opposing primary surface of the conductive material foil.
    Type: Application
    Filed: September 24, 2019
    Publication date: March 25, 2021
    Applicant: Nanotek Instruments, Inc.
    Inventors: Evan House, Aruna Zhamu, Bor Z. Jang
  • Patent number: 10957912
    Abstract: The invention provides a method of improving the cycle-life of a rechargeable alkali metal-sulfur cell. The method comprises implementing an anode-protecting layer between an anode active material layer and a porous separator/electrolyte, and/or implementing a cathode-protecting layer between a cathode active material and the 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: Grant
    Filed: August 29, 2018
    Date of Patent: March 23, 2021
    Assignee: Global Graphene Group, Inc.
    Inventors: Hui He, Aruna Zhamu, Bor Z. Jang
  • Patent number: 10957495
    Abstract: Provided is a supercapacitor comprising an anode, a cathode, an ion-permeable separator disposed between the anode and the cathode, and an electrolyte in ionic contact with the anode and the cathode, wherein at least one of the anode and the cathode contains multiple graphene sheets spaced by cellulosic nanofibers and has a specific surface area from 50 to 3,300 m2/g. Also provided is a process for producing an electrode for such a supercapacitor having a large electrode thickness, high active mass loading, high tap density, and exceptional energy density.
    Type: Grant
    Filed: January 3, 2018
    Date of Patent: March 23, 2021
    Assignee: Nanotek Instruments Group, LLC
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Patent number: 10953380
    Abstract: Provided is a process for manufacturing 2D inorganic compound platelets, the process comprising (a) preparing a first stock containing a 3D layered inorganic compound material dispersed in a liquid medium, (h) injecting the first stock into a continuous reactor having a vortex flow, (c) operating the continuous reactor to form a reaction product suspension containing 2D inorganic compound platelets dispersed in the liquid medium, and (d) separating and recovering said 2D inorganic compound platelets from said product suspension. The product suspension may be directed to flow back to the continuous director for further processing for at least another pass through the reactor, prior to step (d). The continuous reactor is preferably a Couette-Taylor reactor.
    Type: Grant
    Filed: October 21, 2019
    Date of Patent: March 23, 2021
    Assignee: Global Graphene Group, Inc.
    Inventors: Yi-jun Lin, Hsuan-Wen Lee, Aruna Zhamu, Bor Z. Jang
  • Patent number: 10950861
    Abstract: Provided is an aluminum secondary battery comprising an optional anode current collector, an anode, a cathode, and an electrolyte in ionic contact with the anode and the cathode, wherein the anode contains aluminum metal or an aluminum metal alloy and the cathode comprises a layer of graphite or carbon material having expanded inter-graphene planar spaces with an inter-planar spacing d002 from 0.43 nm to 2.0 nm as measured by X-ray diffraction. Such an aluminum battery delivers a high energy density, high power density, and long cycle life.
    Type: Grant
    Filed: February 13, 2017
    Date of Patent: March 16, 2021
    Assignee: Global Graphene Group, Inc.
    Inventors: Aruna Zhamu, Bor Z Jang
  • Patent number: 10950897
    Abstract: Provided is a method of preparing an alkali-sulfur cell comprising: (a) combining a quantity of an active material, a quantity of an electrolyte containing an alkali salt dissolved in a solvent, and a conductive additive to form a deformable and electrically conductive electrode material, wherein the conductive additive, containing conductive filaments, forms a 3D network of electron-conducting pathways; (b) forming the electrode material into a quasi-solid electrode (the first electrode), wherein the forming step includes deforming the electrode material into an electrode shape without interrupting the 3D network of electron-conducting pathways such that the electrode maintains an electrical conductivity no less than 10?6 S/cm; (c) forming a second electrode (the second electrode may be a quasi-solid electrode as well); and (d) forming an alkali-sulfur cell by combining the quasi-solid electrode and the second electrode having an ion-conducting separator disposed between the two electrodes.
    Type: Grant
    Filed: October 15, 2019
    Date of Patent: March 16, 2021
    Assignee: Global Graphene Group, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Patent number: 10934637
    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: Grant
    Filed: May 21, 2018
    Date of Patent: March 2, 2021
    Assignee: Global Graphene Group, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang