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: 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: 20190393543
    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) 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 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.
    Type: Application
    Filed: June 21, 2018
    Publication date: December 26, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190393487
    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 (preferably <1 ?m and more preferably <100 nm) and comprising a lithium ion-conducting material having a lithium ion conductivity from 108 S/cm to 5×10?2 S/cm; 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 108 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: 20190393510
    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 comprising 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 having 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 28, 2018
    Publication date: December 26, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Hui He, Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190386295
    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: Application
    Filed: June 15, 2018
    Publication date: December 19, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190386342
    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: Application
    Filed: September 10, 2018
    Publication date: December 19, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Hui He, Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190386332
    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 50% by weight of a conductive reinforcement material 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. This battery exhibits an excellent combination of high sulfur content, high sulfur utilization efficiency, high energy density, and long cycle life.
    Type: Application
    Filed: June 18, 2018
    Publication date: December 19, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190386337
    Abstract: Provided is a rechargeable alkali metal-sulfur cell comprising an anode active material layer, an electrolyte, and a cathode active material layer comprising multiple particulates, wherein at least one of the particulates comprises one or a plurality of sulfur-containing material particles being embraced or encapsulated by a thin layer of 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, wherein the conductive reinforcement material is selected from graphene sheets, carbon nanotubes, carbon nanofibers, metal nanowires, conductive polymer fibers, or a combination thereof and the composite has a recoverable tensile strain from 2% to 500%, a lithium ion conductivity from 10?7 S/cm to 5×10?2 S/cm, and a thickness from 0.5 nm to 10 ?m. This battery exhibits an excellent combination of high sulfur content, high sulfur utilization efficiency, high energy density, and long cycle life.
    Type: Application
    Filed: June 15, 2018
    Publication date: December 19, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190386347
    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 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. This battery exhibits an excellent combination of high sulfur content, high sulfur utilization efficiency, high energy density, and long cycle life.
    Type: Application
    Filed: June 18, 2018
    Publication date: December 19, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190386296
    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: Application
    Filed: September 10, 2018
    Publication date: December 19, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Hui He, Aruna Zhamu, Bor Z. Jang
  • Patent number: 10511016
    Abstract: 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 ?m, 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.
    Type: Grant
    Filed: November 30, 2016
    Date of Patent: December 17, 2019
    Assignee: Global Graphene Group, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190379039
    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/or the second graphene material is attached to a redox partner species (e.g. sulfonyl group, —NH2, etc.) capable of reversibly forming a redox pair with lithium. The invention also provides an anode electrode and a battery comprising multiple graphene-embraced particulates having redox forming species bonded thereto.
    Type: Application
    Filed: June 6, 2018
    Publication date: December 12, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190379021
    Abstract: Provided is method of improving fast-chargeability of a lithium secondary battery, wherein the method comprises disposing a lithium ion reservoir between an anode and a porous separator and 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 anode in a time-delayed manner. In some embodiments, the reservoir comprises a conducting porous framework structure having pores and lithium-capturing groups residing in the pores, wherein the lithium-capturing groups are selected from (a) redox forming species that reversibly form a redox pair with a lithium ion; (b) electron-donating groups interspaced between non-electron-donating groups; (c) anions and cations wherein the anions are more mobile than the cations; or (d) chemical reducing groups that partially reduce lithium ions from Li+1 to Li+?, wherein 0<?<1.
    Type: Application
    Filed: June 12, 2018
    Publication date: December 12, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Hui He, Chueh Liu, Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190379045
    Abstract: Provided is a lithium secondary battery containing an anode, a cathode, a porous separator disposed between the anode and the cathode, an electrolyte, and a lithium ion reservoir disposed between the anode and the porous separator and configured to receive lithium ions from the cathode when the battery is charged and enable the lithium ions to enter the anode in a time-delayed manner, wherein the reservoir comprises a conducting porous framework structure having pores (pore size from 1 nm to 500 ?m) and lithium-capturing groups residing in the pores, wherein the lithium-capturing groups are selected from (a) redox forming species that reversibly form a redox pair with a lithium ion; (b) electron-donating groups interspaced between non-electron-donating groups; (c) anions and cations wherein the anions are more mobile than the cations; or (d) chemical reducing groups that partially reduce lithium ions from Li+1 to Li+?, wherein 0<?<1.
    Type: Application
    Filed: June 12, 2018
    Publication date: December 12, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Hui He, Chueh Liu, Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190380201
    Abstract: A nano graphene platelet-based conductive ink comprising: (a) nano graphene platelets (preferably un-oxidized or pristine graphene), and (b) a liquid medium in which the nano graphene platelets are dispersed, wherein the nano graphene platelets occupy a proportion of at least 0.001% by volume based on the total ink volume and a process using the same. The ink can also contain a binder or matrix material and/or a surfactant. The ink may further comprise other fillers, such as carbon nanotubes, carbon nano-fibers, metal nano particles, carbon black, conductive organic species, etc. The graphene platelets preferably have an average thickness no greater than 10 nm and more preferably no greater than 1 nm. These inks can be printed to form a range of electrically or thermally conductive components or printed electronic components.
    Type: Application
    Filed: July 23, 2019
    Publication date: December 12, 2019
    Applicant: Global Graphene Group, Inc.
    Inventors: Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190372148
    Abstract: Provided is a lithium secondary battery containing an anode, a cathode, a porous separator/electrolyte element disposed between the anode and the cathode, and a cathode-protecting layer bonded or adhered to the cathode, wherein the cathode-protecting layer comprises a lithium ion-conducting polymer matrix or binder and inorganic material particles that are dispersed in or chemically bonded by the polymer matrix or binder and wherein the cathode-protecting layer has a thickness from 10 nm to 100 ?m and the polymer matrix or binder has a lithium-ion conductivity from 10?8 S/cm to 5×10?2 S/cm. Additionally or alternatively, there can be a similarly configured anode-protecting layer adhered to the anode. Such an electrode-protecting layer prevents massive internal shorting from occurring even when the porous separator gets melted, contracted, or collapsed under extreme temperature conditions induced by, for instance, dendrite or nail penetration.
    Type: Application
    Filed: May 29, 2018
    Publication date: December 5, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Hui He, Yu-Sheng Su, Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190372093
    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, Hao-Hsun Chang, Yu-Sheng Su, Bor Z. Jang
  • Publication number: 20190372174
    Abstract: A method of improving fire resistance of a lithium battery, the method comprising disposing a heat-resistant spacer layer between a porous separator and a cathode layer or anode layer, wherein the heat-resistant spacer layer contains a distribution of particles of a thermally stable material having a heat-induced degradation temperature or melting point higher than 400° C. (up to 3,500° C.) and wherein the heat-resistant spacer layer acts to space apart the anode and the cathode when the porous separator of the battery fails. Such a heat-resistant spacer layer prevents massive internal shorting from occurring when the porous separator gets melted, contracted, or collapsed under extreme temperature conditions induced by, for instance, dendrite or nail penetration.
    Type: Application
    Filed: May 29, 2018
    Publication date: December 5, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Hui He, Yu-Sheng Su, Aruna Zhamu, Bor Z. Jang
  • Publication number: 20190372100
    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: 20190367371
    Abstract: Provided is a graphene foam-based sealing material comprising: (a) a graphene foam framework comprising pores and pore walls, wherein the pore walls comprise a 3D network of interconnected graphene planes or graphene sheets; and (b) a permeation-resistant binder or matrix material that coats and embraces the exterior surfaces of the graphene foam framework and/or infiltrates into pores of the graphene foam, occupying from 10% to 100% (preferably from 10% to 98% and more preferably from 20% to 90%) of the pore volume of the graphene foam framework.
    Type: Application
    Filed: May 31, 2018
    Publication date: December 5, 2019
    Applicant: Nanotek Instruments, Inc.
    Inventors: Yi-jun Lin, Aruna Zhamu, Bor Z. Jang