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    Methods of pre-lithiating electrodes
    104.
    发明授权
    Methods of pre-lithiating electrodes 有权

    公开(公告)号：US11527745B2

    公开(公告)日：2022-12-13

    申请号：US16559132

    申请日：2019-09-03

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Mark W. Verbrugge ,  Xingcheng Xiao ,  Jiagang Xu

    IPC: H01M4/131 ,  H01M4/134 ,  H01M4/136 ,  H01M4/133 ,  H01M10/052 ,  H01M4/36 ,  H01M4/38

    Abstract: The present disclosure provides methods of compensation for capacity loss resulting from cycle-induced lithium consumption in an electrochemical cell including at least one electrode. Such methods may include adding a lithiation additive to the at least one electrode so as to create a lithium source. The lithium source compensates for cycle-induced lithiation loss such that the electrochemical cell having the lithiation additive experiences total capacity losses of less than or equal to about 5% of an initial capacity prior to cycling of lithium. The lithiation additive includes a lithium silicate represented by the formula LiuHr, where Hr=Liy-uSiOz and where 0≤y≤3.75 and 0≤z≤2 and u is a useable portion of y, 0≤u≤y. The lithium source may include z 4 ⁢ L ⁢ i 4 ⁢ Si ⁢ O 4 and LimSi, where 0≤m≤4.4.

    ELECTROCHEMICAL CELLS WITH COPPER-FREE ELECTRODES AND METHODS FOR MANUFACTURING THE SAME
    106.
    发明申请
    ELECTROCHEMICAL CELLS WITH COPPER-FREE ELECTRODES AND METHODS FOR MANUFACTURING THE SAME 有权

    公开(公告)号：US20220131126A1

    公开(公告)日：2022-04-28

    申请号：US17082618

    申请日：2020-10-28

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Xingcheng Xiao ,  Hongliang Wang ,  Meinan He

    IPC: H01M4/04 ,  H01M4/46

    Abstract: Presented are electrochemical devices with copper-free electrodes, methods for making/using such devices, and lithium alloy-based electrode tabs and current collectors for rechargeable lithium-class battery cells. A method of manufacturing copper-free electrodes includes feeding an aluminum workpiece, such as a strip of aluminum sheet metal, into a masking device. The masking device then applies a series of dielectric masks, such as strips of epoxy resin or dielectric tape, onto discrete areas of the workpiece to form a masked aluminum workpiece with masked areas interleaved with unmasked areas. The masked workpiece is then fed into an electrolytic anodizing solution, such as sulfuric acid, to form an anodized aluminum workpiece with anodized surface sections on the unmasked areas interleaved with un-anodized surface sections underneath the dielectric masks of the masked areas. The dielectric masks are removed to reveal the un-anodized surface sections, and the anodized aluminum workpiece is segmented into multiple copper-free electrodes.

    Method for in situ growth of axial geometry carbon structures in electrodes
    108.
    发明授权
    Method for in situ growth of axial geometry carbon structures in electrodes 有权

    公开(公告)号：US10950846B2

    公开(公告)日：2021-03-16

    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 ,  H01M4/1393 ,  H01M4/139 ,  H01M4/62 ,  H01M4/1395 ,  H01M10/0525 ,  H01M4/134 ,  H01M4/38

    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.

    Protective coating for lithium-containing electrode and methods of making the same
    110.
    发明授权
    Protective coating for lithium-containing electrode and methods of making the same 有权

    公开(公告)号：US10903478B2

    公开(公告)日：2021-01-26

    申请号：US15947272

    申请日：2018-04-06

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Xingcheng Xiao

    IPC: H01M4/04 ,  H01M10/052 ,  H01M10/04

    Abstract: A lithium-containing electrode with a protective coating and lithium-containing electrochemical cells including the same are provided herein. The protective coating has a first layer including a first fluoropolymeric matrix and Li—F compounds and a second layer including a second fluoropolymeric matrix. Methods of preparing the protective coating on the lithium-containing electrode by applying a first fluoropolymer and/or a first fluoropolymer precursor and a second fluoropolymer and/or a second fluoropolymer precursor are also provided herein.

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