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    Polymerization process for forming polymeric ultrathin conformal coatings on electrode materials
    81.
    发明授权
    Polymerization process for forming polymeric ultrathin conformal coatings on electrode materials 有权

    公开(公告)号：US10991946B2

    公开(公告)日：2021-04-27

    申请号：US16513303

    申请日：2019-07-16

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Xingcheng Xiao ,  Xiaosong Huang

    IPC: H01M4/04 ,  H01M10/0525 ,  H01M4/62 ,  H01M4/134 ,  H01M4/1395 ,  H01M4/38 ,  H01M4/36 ,  H01M4/02

    Abstract: An electroactive material for use in an electrochemical cell, like a lithium ion battery, is provided. The electroactive material comprises silicon or tin and undergoes substantial expansion during operation of a lithium ion battery. A polymeric ultrathin conformal coating is formed over a surface of the electroactive material. The coating is flexible and is capable of reversibly elongating by at least 250% from a contracted state to an expanded state in at least one direction to minimize or prevent fracturing of the negative electrode material during lithium ion cycling. The coating may be applied by vapor precursors reacting in atomic layer deposition (ALD) to form conformal ultrathin layers over the electroactive materials. Methods for making such materials and using such materials in electrochemical cells are likewise provided.

    METHODS FOR MANUFACTURING ELECTRODES INCLUDING FLUOROPOLYMER-BASED SOLID ELECTROLYTE INTERFACE LAYERS
    82.
    发明申请
    METHODS FOR MANUFACTURING ELECTRODES INCLUDING FLUOROPOLYMER-BASED SOLID ELECTROLYTE INTERFACE LAYERS 审中-公开

    公开(公告)号：US20200321603A1

    公开(公告)日：2020-10-08

    申请号：US16377814

    申请日：2019-04-08

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Xingcheng Xiao

    IPC: H01M4/04 ,  H01M4/62 ,  H01M4/134 ,  H01M10/052 ,  H01M10/0585 ,  H01M4/38

    Abstract: Methods for manufacturing electrodes include applying a fluoropolymer film to a lithium-based host material, defluorinating the fluoropolymer film by heating to produce a lithium electrode having a solid electrolyte interface (SEI) layer including defluorinated fluoropolymers and at least about 5 wt. % LiF. The fluoropolymers can include one or more of fluorinated ethylenepropylene, perfluoroalkoxy alkanes, vinylidenefluoride, and copolymers of perfluoromethylvinylether and tetrafluoroethylene. The fluoropolymers can include one or more fluorinated monomers, including hexafluoropropylene, tetrafluoroethylene, ethylene-tetrafluoroethylene, perfluoroethers, and vinylidene fluoride. The —CF3 functional groups of the defluorinated fluoropolymers can be about 3 wt. % to about 10 wt. % of the SEI layer. The SEI layer can include about 30 wt. % to about 50 wt. % LiF. The method can include assembling a battery cell by disposing a battery separator between a cathode and the electrode, and disposing the battery separator, the cathode, and the electrode in an electrolyte.

    METHOD AND APPARATUS FOR EVALUATING BATTERY CELLS CONTAINING MATERIALS THAT EXHIBIT VOLTAGE HYSTERESIS
    88.
    发明申请
    METHOD AND APPARATUS FOR EVALUATING BATTERY CELLS CONTAINING MATERIALS THAT EXHIBIT VOLTAGE HYSTERESIS 审中-公开

    公开(公告)号：US20180306865A1

    公开(公告)日：2018-10-25

    申请号：US15934161

    申请日：2018-03-23

    Applicant: GM Global Technology Operations LLC

    Inventor： Mark W. Verbrugge ,  Daniel R. Baker ,  Xingcheng Xiao

    IPC: G01R31/36 ,  H02J7/00 ,  H02J7/14

    CPC classification number: G01R31/362 ,  H02J7/0021 ,  H02J7/1446

    Abstract: A method for determining a state of charge (SOC) of a rechargeable battery cell includes determining a rate-invariant charge/discharge relationship between an open-circuit voltage (OCV) and a state of charge (SOC). This includes a first finite-rate voltage scan following a reduction branch of a relationship between OCV and the SOC, and executing a second finite-rate voltage scan following an oxidation branch of a relationship between OCV and the SOC. A rate-dependent charge/discharge relationship between the OCV and the SOC is determined during scanned voltage transitions between the reduction and oxidation branches. A present SOC state is determined based upon an electrical potential, the rate-invariant charge/discharge relationship between the OCV and the SOC, and the rate-dependent charge/discharge relationship between the OCV and the SOC during a voltage-scan reversal that occurs when the scanned voltage transitions between the reduction and oxidation branches.

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