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    METHOD FOR ANALYZING COHESIVE FAILURE OF ELECTRODE
    3.
    发明申请
    METHOD FOR ANALYZING COHESIVE FAILURE OF ELECTRODE 有权

    公开(公告)号：US20210057728A1

    公开(公告)日：2021-02-25

    申请号：US16995976

    申请日：2020-08-18

    Applicant: LG CHEM, LTD.

    Inventor： In Young SONG ,  Joo Yul BAEK ,  Jeong Kyu LEE ,  Sung Joon OH ,  Jong Chan LEE

    IPC: H01M4/36 ,  H01M4/04 ,  H01M4/133 ,  H01M4/62 ,  H01M10/0525

    Abstract: A method for quantitatively analyzing cohesive failure of an electrode analyzes cohesive failure of an electrode and includes preparing an electrode in which an electrode material mixture layer including an electrode active material, a conductive agent, and a binder is formed on a current collector, measuring shear strength (σ) data according to a cutting depth while cutting the electrode material mixture layer from a surface thereof until reaching the current collector using a surface and interfacial cutting analysis system (SAICAS), obtaining a regression curve of shear strength according to the cutting depth from the shear strength (σ) data, and determining a cutting depth, at which the shear strength is minimum in the regression curve, as a location of cohesive failure.

    METHOD FOR PRODUCING POLYACRYLONITRILE-BASED FIBER AND POLYACRYLONITRILE-BASED COPOLYMER USED THEREIN
    5.
    发明申请
    METHOD FOR PRODUCING POLYACRYLONITRILE-BASED FIBER AND POLYACRYLONITRILE-BASED COPOLYMER USED THEREIN 审中-公开

    公开(公告)号：US20200149196A1

    公开(公告)日：2020-05-14

    申请号：US16335076

    申请日：2017-11-22

    Applicant: LG CHEM, LTD.

    Inventor： Jeong Kyu LEE ,  Chang Hun KIM ,  In Young SONG ,  Jeong Hun CHO ,  Jong Soo DO ,  Sung Joon OH ,  Joon Hee CHO

    IPC: D01F9/22 ,  C08F220/44 ,  C08F220/04 ,  C08F220/18

    Abstract: The present invention relates to a method for producing a polyacrylonitrile-based fiber, wherein the method polymerizes a monomer mixture including an acrylonitrile-based monomer, a carboxylic acid-based comonomer, and an acrylate-based comonomer, wherein the acrylate-based comonomer includes the steps of producing a polyacrylonitrile-based copolymer so as to be included in an amount of 4 to 20 parts by weight based on 100 parts by weight of the monomer mixture, fiberizing the polyacrylonitrile-based copolymer, oxidizing and stabilizing the fiberized polyacrylonitrile-based copolymer, which may control the oxidation stabilization reaction, particularly the cyclization reaction. Accordingly, the energy consumption of the oxidation stabilization reaction may be reduced, economical efficiency of the production of polyacrylonitrile-based fiber may be obtained, and the physical and mechanical properties of the carbon fiber may be improved.

    ELECTRODE FOR SECONDARY BATTERY AND LITHIUM SECONDARY BATTERY COMPRISING THE SAME
    6.
    发明申请
    ELECTRODE FOR SECONDARY BATTERY AND LITHIUM SECONDARY BATTERY COMPRISING THE SAME 有权

    公开(公告)号：US20210057719A1

    公开(公告)日：2021-02-25

    申请号：US16996216

    申请日：2020-08-18

    Applicant: LG CHEM, LTD.

    Inventor： In Young SONG ,  Joo Yul BAEK ,  Jeong Kyu LEE ,  Sung Joon OH ,  Jong Chan LEE

    IPC: H01M4/133 ,  H01M10/0525 ,  H01M4/36 ,  H01M4/587

    Abstract: An electrode for a secondary battery including a current collector, and at least one electrode material mixture layer on a surface of the current collector, the electrode material mixture layer including a negative electrode active material, a conductive agent, and a binder wherein, the electrode has a property such that in a regression curve obtained by regression analysis of shear strength data according to a cutting depth which are measured while obliquely cutting the electrode material mixture layer from a surface thereof until reaching the current collector using a surface and interfacial cutting analysis system (SAICAS), a ratio of a maximum value (σmax) to a minimum value (σmin) of shear strength is 1.7 or less.

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