Patents by Inventor Mei Cai

Mei Cai 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: 20190372114
    Abstract: An example of a negative electrode includes silicon nanoparticles having a carbon coating thereon. The carbon coating has an oxygen-free structure including pentagon rings. The negative electrode with the silicon nanoparticles having the carbon coating thereon may be incorporated into a lithium-based battery. In an example of a method, silicon nanoparticles are provided. A carbon precursor is applied on the silicon nanoparticles. The carbon precursor is an oxygen-free, fluorene-based polymer. Then the silicon nanoparticles are heated in an inert gas atmosphere to form the carbon coating on the silicon nanoparticles. The carbon coating formed on the silicon nanoparticles has an oxygen-free structure including pentagon rings.
    Type: Application
    Filed: August 13, 2019
    Publication date: December 5, 2019
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Li YANG, Mei CAI, Meng JIANG, Martin S. RUTHKOSKY
  • Publication number: 20190363345
    Abstract: Methods of removing a passivation layer on a lithium-containing electrode and preparing a protective coating on the lithium-containing electrode by applying a graphene source are provided herein. A lithium-containing electrode with the protective coating including graphene and lithium-containing electrochemical cells including the same are also provided herein.
    Type: Application
    Filed: May 24, 2018
    Publication date: November 28, 2019
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Xingcheng XIAO, Mei CAI
  • Patent number: 10487235
    Abstract: The present disclosure provides a battery pack component including a self-healing coating. The self-healing coating is disposed on at least a portion of a surface of the battery pack component. The self-healing coating includes a first precursor including a cyclic ether capable of reacting in a self-healing cationic ring-opening polymerization reaction. The self-healing coating further includes an initiator including an alkali metal salt. The self-healing cationic ring-opening polymerization reaction occurs when a defect is present in the self-healing coating. In certain aspects, the cyclic ether may include 1,3-dioxolane (C3H6O2) and the initiator may include lithium bis(fluorosulfonyl)imide (F2NaNO4S2). In other aspects, the self-healing coating may include a second precursor that is capable of copolymerizing with the first precursor. In still other aspects, the present disclosure provides a method of making a self-healing coating for a battery pack component.
    Type: Grant
    Filed: February 17, 2017
    Date of Patent: November 26, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Fang Dai, Mei Cai, Tao Wang, Mohammed Bahauddin, Sherman Zeng
  • Patent number: 10483592
    Abstract: A method of manufacturing a lithium ion battery cell. A non-aqueous liquid electrolyte solution is placed in contact with particles of a lithium ion-exchanged zeolite material for a time sufficient to remove water molecules from the liquid electrolyte solution. Thereafter, the liquid electrolyte solution may be introduced into an electrochemical cell assembly and hermetically sealed within a cell casing to form a lithium ion battery cell.
    Type: Grant
    Filed: August 30, 2017
    Date of Patent: November 19, 2019
    Assignee: GM Global Technology Operations LLC
    Inventors: Xingcheng Xiao, Mark W. Verbrugge, Mei Cai, Sherman H. Zeng
  • Patent number: 10476074
    Abstract: Methods for making electroactive composite materials for electrochemical cells are provided. The method includes introducing a particle mixture comprising a first particle having a first diameter (R1) and comprising a first electroactive material and a second particle having a second diameter (R2) smaller than the first diameter (R1) and comprising a second electroactive material into a dry-coating device having a rotatable vessel defining a cavity and a rotor disposed therewithin. The vessel is rotated at a first speed in a first direction, and the rotor is rotated at a second speed greater than the first speed in a second direction opposing the first direction. The particle mixture flows between cavity walls and the rotor and experiences thrusting and compression forces that create a substantially uniform coating comprising the second electroactive material on one or more exposed surfaces of the first particle.
    Type: Grant
    Filed: July 27, 2017
    Date of Patent: November 12, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Xingcheng Xiao, Jingmei Shen, Mei Cai, Martin S. Ruthkosky
  • Patent number: 10476105
    Abstract: Systems and methods of providing self-healing gel-type electrolyte composites for metal batteries are disclosed. According to aspects of the disclosure, a method includes preparing a ternary mixture including an electrolyte portion, a matrix precursor portion, and a self-healing portion, forming a self-healing gel-electrolyte membrane by initiating polymerization of the gel-forming precursor and the gel-forming initiator to thereby form a polymer matrix, and disposing the self-healing gel-electrolyte membrane between an anode and a cathode. The self-healing portion includes a self-healing precursor that is flowable and a self-healing initiator. The matrix precursor portion includes a gel-forming precursor and a gel-forming initiator. The electrolyte portion and the self-healing portion are disposed substantially throughout the polymer matrix and the polymer matrix includes a plurality of gel-forming active sites.
    Type: Grant
    Filed: August 18, 2017
    Date of Patent: November 12, 2019
    Assignee: GM Global Technology Operations LLC
    Inventors: Fang Dai, Mahmoud Abd Elhamid, Mei Cai, Anne M. Dailly, Robert M. Lapierre
  • Publication number: 20190329353
    Abstract: A negative electrode for an electrochemical cell of a lithium metal battery may be manufactured by joining together a metallic current collector piece and a lithium metal piece. The metallic current collector piece may be positioned adjacent the lithium metal piece in an at least partially lapped configuration at a weld site. A laser beam may be directed at an upper surface of the metallic current collector piece at the weld site to melt a portion of the lithium metal piece adjacent the metallic current collector piece and produce a lithium metal molten weld pool. The second laser beam may be terminated to solidify the lithium metal molten weld pool into a solid weld joint that physically bonds the lithium metal piece and the metallic current collector piece together at the weld site.
    Type: Application
    Filed: April 30, 2018
    Publication date: October 31, 2019
    Inventors: Fang Dai, Hongliang Wang, Wayne Cai, Mei Cai
  • Publication number: 20190326070
    Abstract: A porous carbon material includes a hierarchical porous structure including a primary microporous structure and at least one of a secondary mesoporous structure and a secondary macroporous structure. The porous carbon material is formed by combining a halogenated-hydrocarbon, an aprotic hydrocarbon solvent, and a reductant to initiate a reaction that forms intermediate particles having a microporous framework; and subjecting the intermediate particles to a heat treatment at a heat treatment temperature ranging from about 300° C. to less than 1,500° C. for a heat treatment time period ranging from about 20 minutes to about 10 hours to thereby form the porous carbon material. The aprotic hydrocarbon solvent is selected from the group consisting of toluene, hexane, cyclohexane, and combinations thereof.
    Type: Application
    Filed: June 26, 2019
    Publication date: October 24, 2019
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Fang Dai, Jingmei Shen, Mei Cai, Anne M. Dailly
  • Publication number: 20190319242
    Abstract: A modified separator for a high-energy lithium metal-based electrochemical cell and methods of formation relating thereto are provided. The modified separator includes a substrate including a dopant and a coating layer disposed on the doped substrate. The dopant and compound comprising the coating layer are independently selected from the group consisting of: aluminum oxide (Al2O3), titanium dioxide (TiO2), zirconium dioxide (ZrO2), zinc oxide (ZnO), iron oxide (Fe2O3), tin oxide (SnO), silicon oxide (SiO2), tantalum oxide (Ta2O5), lanthanum oxide (La2O3), hydrofluoroolefin (HfO), cerium oxide (CeO2), and combinations thereof.
    Type: Application
    Filed: April 13, 2018
    Publication date: October 17, 2019
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Gayatri V. DADHEECH, Li YANG, Mei CAI, Biqiong WANG
  • Patent number: 10446884
    Abstract: An example of a three-electrode test cell includes a negative electrode, a positive electrode having an aperture defined therein, a reference electrode, and a first microporous polymer separator soaked in an electrolyte. The reference electrode is disposed within the aperture of the positive electrode and physically separated from the positive electrode. The first microporous polymer separator is disposed between the negative electrode and the positive electrode.
    Type: Grant
    Filed: October 17, 2016
    Date of Patent: October 15, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Li Yang, Mei Cai, Martin S. Ruthkosky, Fang Dai
  • Publication number: 20190312255
    Abstract: A negative electrode for an electrochemical cell of a lithium metal battery may be manufactured by welding together a lithium metal layer and a metallic current collector layer. The lithium metal layer and the current collector layer may be arranged adjacent one another and in an at least partially lapped configuration such that faying surfaces of the layers confront one another and establish a faying interface therebetween at a weld site. A laser beam may be directed at an outer surface of the current collector layer at the weld site to melt a portion of the lithium metal layer adjacent the faying surface of the current collector layer and produce a lithium metal molten weld pool. The laser beam may be terminated to solidify the molten weld pool into a solid weld joint that physically bonds the lithium metal layer and the current collector layer together at the weld site.
    Type: Application
    Filed: April 10, 2018
    Publication date: October 10, 2019
    Inventors: Fang Dai, Hongliang Wang, Wayne Cai, Mei Cai, Michael P. Balogh
  • Patent number: 10434870
    Abstract: An adsorption storage tank for a natural gas includes a pressurizable tank disposed on a vehicle to contain the natural gas. A natural gas adsorbent is disposed in the tank. The natural gas is a mixture of constituents having a constituent statistical distribution of molecule lengths and kinetic diameters. The adsorbent has a pore size statistical distribution of pore sizes to adsorb and desorb the mixture of constituents.
    Type: Grant
    Filed: May 11, 2016
    Date of Patent: October 8, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Jingmei Shen, Anne M. Dailly, Fang Dai, Mei Cai
  • Publication number: 20190302048
    Abstract: The present invention provides a humidity sensor, comprising a substrate having a coating wire and at least one humidity detecting portion S, each humidity detecting portion S comprises at least two electrodes, and each of electrodes is connected to their respective coating wires, and an electrochemical medium which is electrically insulated when dry and conductive when wet is provided between electrodes. This kind of humidity sensors can be used to monitor humidity in a highly sensitive manner, especially monitor the amount and extent of urine.
    Type: Application
    Filed: February 26, 2019
    Publication date: October 3, 2019
    Inventors: Kuo Chung CHANG, Guo Cai HUANG, Po-Feng LEE, Mei-Yen FANG
  • Patent number: 10424784
    Abstract: An example of a negative electrode includes silicon nanoparticles having a carbon coating thereon. The carbon coating has an oxygen-free structure including pentagon rings. The negative electrode with the silicon nanoparticles having the carbon coating thereon may be incorporated into a lithium-based battery. In an example of a method, silicon nanoparticles are provided. A carbon precursor is applied on the silicon nanoparticles. The carbon precursor is an oxygen-free, fluorene-based polymer. Then the silicon nanoparticles are heated in an inert gas atmosphere to form the carbon coating on the silicon nanoparticles. The carbon coating formed on the silicon nanoparticles has an oxygen-free structure including pentagon rings.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: September 24, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Li Yang, Mei Cai, Meng Jiang, Martin S. Ruthkosky
  • Patent number: 10422036
    Abstract: In an example of a method for suppressing aging of platinum group metal (PGM) particles in a catalytic converter, PGM particles are applied to a support. A surface of the PGM particles is passivated by exposing the PGM particles to carbon monoxide at a temperature equal to or less than 200° C. to introduce —CO groups to the surface. Atomic layer deposition (ALD) is performed to selectively grow a barrier on the support around the PGM particles.
    Type: Grant
    Filed: September 26, 2016
    Date of Patent: September 24, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Xingcheng Xiao, Mei Cai, Gongshin Qi
  • Publication number: 20190288273
    Abstract: A method of making an electrochemical cell comprising a silicon-containing anode includes forming a first electrochemical cell comprising the silicon-containing anode and a first electrolyte system, pre-lithiating the silicon-containing anode to produce a pre-lithiated anode in the first electrochemical cell, and forming a second electrochemical cell including the pre-lithiated anode and a second electrolyte system. The first electrolyte system includes a fluorinated solvent in an amount greater than 5 wt % and a first salt; and the second electrolyte system includes a hydrocarbon and a second salt. Forming the second electrochemical cell may include removing the first electrolyte system from the first electrochemical cell and introducing the second electrolyte to the emptied first electrochemical cell; or removing the pre-lithiated anode from the first electrochemical cell and constructing the second electrochemical cell with the pre-lithiated anode and the second electrolyte system.
    Type: Application
    Filed: March 19, 2018
    Publication date: September 19, 2019
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Li Yang, Mark W. Verbrugge, Mei Cai, Meng Jiang
  • Patent number: 10388959
    Abstract: In the formation of cathodes for lithium-sulfur battery cells, it is often desired to form the cathodes by resin-bonding particles of a sulfur-based cathode material as a porous cathode material layer on the surface(s) of a suitable metal current collector. It is found that the use of a copolymer of polyethylene oxide and polyvinyl alcohol, dissolved in water, provides a resin-particle slurry that is readily spreadable onto the current collector surface to form a uniform layer of porous cathode material particles. And upon evaporation of the water, the copolymer-bonded, sulfur-based particle coated cathodes function very well in assembled lithium-sulfur cells.
    Type: Grant
    Filed: June 15, 2017
    Date of Patent: August 20, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Yingnan Dong, Mei Cai, Li Yang, Xiaosong Huang
  • Patent number: 10381170
    Abstract: In an example of a method, a halogenide-hydrocarbon, an aprotic hydrocarbon solvent, and a reductant are combined to initiate a reaction that forms intermediate particles having a microporous framework. The intermediate particles are subjected to a heat treatment at a heat treatment temperature ranging from about 300° C. to less than 1500° C. for a heat treatment time period ranging from about 20 minutes to about 10 hours to form a precursor to microporous carbon.
    Type: Grant
    Filed: March 29, 2017
    Date of Patent: August 13, 2019
    Assignee: GM Global Technology Operations LLC
    Inventors: Fang Dai, Jingmei Shen, Mei Cai, Anne M. Dailly
  • Patent number: 10367201
    Abstract: A negative electrode includes a metal substrate and a polymeric single-ion conductor coating formed on a surface of the metal substrate. The metal substrate is selected from the group consisting of lithium, sodium, and zinc. The polymeric single-ion conductor coating is formed of i) a metal salt of a sulfonated tetrafluoroethylene-based fluoropolymer copolymer or ii) a polymeric metal salt having an initial polymeric backbone and pendent metal salt groups attached to the initial polymeric backbone.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: July 30, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Li Yang, Mei Cai, Qiangfeng Xiao, Xiaosong Huang, Mark W. Verbrugge
  • Publication number: 20190229318
    Abstract: A porous separator for a lithium-containing electrochemical cell is provided herein. The porous separator includes a porous substrate and an active layer comprising lithium ion-exchanged zeolite particles. Methods of manufacturing the porous separator and lithium-containing electrochemical cells including the porous separator are also provided herein.
    Type: Application
    Filed: January 24, 2018
    Publication date: July 25, 2019
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Xingcheng Xiao, Mei Cai, Gongshin Qi