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    METHODS OF LITHIATING ELECTROACTIVE MATERIALS
    21.
    发明申请
    METHODS OF LITHIATING ELECTROACTIVE MATERIALS 有权

    公开(公告)号：US20210175486A1

    公开(公告)日：2021-06-10

    申请号：US16706331

    申请日：2019-12-06

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Jeffrey D. CAIN ,  Andrew C. BOBEL ,  Nicholas P. PIECZONKA ,  Robert D. SCHMIDT ,  Anil K. SACHDEV ,  Mark W. VERBRUGGE

    IPC: H01M4/04 ,  H01M4/1391

    Abstract: The present disclosure relates to electroactive materials for use in electrodes of lithium-ion electrochemical cells and methods of making the same, for example, methods for lithiating electroactive materials. A method of lithiating an electroactive material may include dispersing an electroactive material precursor within a room-temperature electrolyte that includes a lithium-based salt and contacting the electrolyte mixture and a lithium source so as to cause the lithium source to ionize and form lithium ions. The lithium ions may react with the electroactive material precursor to form a fully lithiated electroactive material (e.g., greater than 70% of total lithiation). The method further includes, in certain aspects, electrochemically discharging the fully lithiated electroactive material to form a lithiated electroactive material having an optimized lithiation state (e.g., less than or equal to about 40% of a first lithiation state of the fully lithiated electroactive material).

    METHOD FOR IN SITU GROWTH OF AXIAL GEOMETRY CARBON STRUCTURES IN ELECTRODES
    23.
    发明申请
    METHOD FOR IN SITU GROWTH OF AXIAL GEOMETRY CARBON STRUCTURES IN ELECTRODES 审中-公开

    公开(公告)号：US20200220153A1

    公开(公告)日：2020-07-09

    申请号：US16239027

    申请日：2019-01-03

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Xingcheng XIAO ,  Mark W. VERBRUGGE

    IPC: H01M4/04 ,  H01M4/62 ,  H01M4/38 ,  H01M10/0525 ,  H01M4/134 ,  H01M4/1395

    Abstract: Methods of forming a plurality of axial geometry carbon structures (e.g., carbon nanotubes or carbon fibers) in situ in an electrode of an electrochemical cell that cycles lithium ions are provided. Electroactive particles that undergo volumetric expansion are mixed with a polymer precursor and a plurality of catalytic nanoparticles comprising a metal selected from the group consisting of: iron, nickel, cobalt, alloys, and combinations thereof to form a substantially homogeneous slurry. The slurry is applied to a substrate and then heated in an environment having a temperature of ≤about 1000° C. and in certain aspects, ≤about 895° C. to pyrolyze the polymer precursor. The plurality of catalytic nanoparticles facilitates in situ precipitation of carbon to grow a plurality of axial geometry carbon structures. After the heating, the electrode includes an electrically conductive carbonaceous porous network comprising the plurality of electroactive particles and the plurality of axial geometry carbon structures.

    THICK ELECTRODES FOR ELECTROCHEMICAL CELLS
    27.
    发明申请
    THICK ELECTRODES FOR ELECTROCHEMICAL CELLS 有权

    公开(公告)号：US20220173377A1

    公开(公告)日：2022-06-02

    申请号：US17539901

    申请日：2021-12-01

    Applicant: GM Global Technology Operations LLC

    Inventor： Dewen KONG ,  Xiaochao QUE ,  Haijing LIU ,  Xiaosong HUANG ,  Mark W. VERBRUGGE ,  Meiyuan WU

    IPC: H01M4/136 ,  H01M4/58 ,  H01M4/66 ,  H01M4/62 ,  H01M10/0525

    Abstract: The present disclosure relates to high capacity (e.g., areal capacity greater than about 4 mAh/cm2 to less than or equal to about 50 mAh/cm2) electrodes for electrochemical cells. An example electrode may include a current collector (e.g., meshed current collector) and one or more electroactive material layers having thicknesses greater than about 150 μm to less than or equal to about 5 mm. The electroactive material layers may each include lithium manganese iron phosphate (LiMnxFe1-xPO4, where 0≤x≤1) (LMFP). The electrode may further include one or more electronically conductive adhesive layers disposed between the current collector and the electroactive material layers. The adhesive layers may include one or more polymer components and one or more conductive fillers. The electroactive material layers may be gradient layers, where sublayers closer to the current collector has a lower porosity than layers further from the current collector.

    METHODS FOR PRE-LITHIATING LITHIUM ION BATTERIES
    30.
    发明申请
    METHODS FOR PRE-LITHIATING LITHIUM ION BATTERIES 有权

    公开(公告)号：US20210151787A1

    公开(公告)日：2021-05-20

    申请号：US16689748

    申请日：2019-11-20

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Xingcheng XIAO ,  Xingyi YANG ,  Mark W. VERBRUGGE ,  Raghunathan K ,  Qinglin ZHANG

    IPC: H01M10/0525 ,  H01M4/485 ,  H01M10/0562 ,  H01M4/525 ,  C01G53/00

    Abstract: Lithiated electrodes, electrochemical cells including lithiated electrodes, and methods of making the same are provided. The method includes lithiating at least one electrode in an electrochemical cell by applying current across a first current collector of the at least one electrode to a second current collector of an auxiliary electrode. The electrochemical cell may be disposed within a battery packaging and the auxiliary electrode may be disposed within the battery packaging adjacent to an edge of the electrochemical cell. The at least one electrode may include a first electroactive layer disposed on or near one or more surfaces of the first current collector, and the auxiliary electrode may include a second electroactive layer disposed at or near one or more surfaces of the second current collector. The method may further include extracting the auxiliary electrode from the battery packaging and sealing the battery packaging, which includes the pre-lithiated electrochemical cell.

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