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    Cathode active material, and battery using the same
    2.
    发明授权
    Cathode active material, and battery using the same 有权

    公开(公告)号：US11228033B2

    公开(公告)日：2022-01-18

    申请号：US16503442

    申请日：2019-07-03

    Applicant: Panasonic Intellectual Property Management Co., Ltd.

    Inventor： Kensuke Nakura ,  Ryuichi Natsui ,  Shuhei Uchida ,  Takuji Tsujita

    IPC: H01M4/505 ,  H01M4/131 ,  H01M4/36 ,  H01M4/525 ,  H01M10/0525 ,  H01M4/02 ,  C01G25/02 ,  C01G23/04 ,  H01M4/62 ,  B82Y30/00

    Abstract: Provided is a cathode active material comprising a lithium composite oxide and a covering material which covers a surface of the lithium composite oxide. The lithium composite oxide is a multi-phase mixture including a first phase having a crystal structure which belongs to a monoclinic crystal; a second phase having a crystal structure which belongs to a hexagonal crystal; and a third phase having a crystal structure which belongs to a cubical crystal. The lithium composite oxide has an integral intensity ratio I(18°-20°)/I(43°-46°) of not less than 0.05 and not more than 0.99, where the integral intensity I(α°-β°) is an integral intensity of a peak which is a maximum peak present within a range of a diffraction angle 2θ of not less than α° and not more than β° in an X-ray diffraction pattern of the lithium composite oxide. The covering material has an electronic conductivity of not more than 106 S/m.

    Cathode active material and battery using the same
    3.
    发明授权
    Cathode active material and battery using the same 有权

    公开(公告)号：US11183684B2

    公开(公告)日：2021-11-23

    申请号：US16459614

    申请日：2019-07-02

    Applicant: Panasonic Intellectual Property Management Co., Ltd.

    Inventor： Takuji Tsujita ,  Kensuke Nakura ,  Shuhei Uchida ,  Ryuichi Natsui

    IPC: H01M4/36 ,  H01M4/485 ,  H01M4/62 ,  H01M10/0525 ,  H01M4/505 ,  H01M4/02

    Abstract: A cathode active material includes a lithium composite oxide and a covering material which covers a surface of the lithium composite oxide. The lithium composite oxide is a multi-phase mixture including a first phase having a crystal structure which belongs to a space group C2/m and a second phase having a crystal structure which belongs to a space group R-3m. The lithium composite oxide has an integral intensity ratio I(18°-20°)/I(43°-46°) of not less than 0.05 and not more than 1.15, where the integral intensity ratio I(18°-20°)/I(43°-46°) is a ratio of an integral intensity I(18°-20°) to an integral intensity I(43°-46°). The integral intensity I(α°-β°) is an integral intensity of a first peak which is a maximum peak present within a range of a diffraction angle 2θ of not less than α° and not more than β° in an X-ray diffraction pattern of the lithium composite oxide.

    POSITIVE ELECTRODE FOR SECONDARY BATTERY, AND METHOD FOR PRODUCING POSITIVE ELECTRODE ACTIVE MATERIAL FOR SECONDARY BATTERY
    10.
    发明申请
    POSITIVE ELECTRODE FOR SECONDARY BATTERY, AND METHOD FOR PRODUCING POSITIVE ELECTRODE ACTIVE MATERIAL FOR SECONDARY BATTERY 有权

    公开(公告)号：US20250105274A1

    公开(公告)日：2025-03-27

    申请号：US18724795

    申请日：2022-10-31

    Applicant: Panasonic Intellectual Property Management Co., Ltd.

    Inventor： Youshin Lee ,  Mitsuhiro Hibino ,  Kensuke Nakura

    IPC: H01M4/525 ,  H01M4/02 ,  H01M4/04 ,  H01M10/0525

    Abstract: This positive electrode comprises a positive electrode current collector, and a positive electrode mixture layer disposed on the positive electrode current collector, wherein: the positive electrode mixture layer has a positive electrode active material containing a lithium-containing composite oxide composed of secondary particles in which primary particles are aggregated; the lithium-containing composite oxide has a Nb element; the average particle diameter of the primary particles is 1 μm or less; and in a depth profile obtained by time-of-flight secondary ion mass spectrometry (TOF-SIMS) of a cross-section of the positive electrode mixture layer, when the minimum ionic strength of Nb in the region from the surface of the positive electrode mixture layer to 500 nm in the thickness direction is Imin and the maximum ionic strength of Nb in a region from 500 nm to 1000 nm in the thickness direction is Imax, Imax/Imin is at least 1.5.

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