公开(公告)号：US20230086200A1

公开(公告)日：2023-03-23

申请号：US17795794

申请日：2020-12-17

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Shuhei UCHIDA ,  Yoshinori SATOU

IPC: H01M4/36 ,  H01M4/58 ,  H01M4/38 ,  H01M4/583 ,  H01M4/133 ,  H01M4/134 ,  H01M4/136 ,  H01M4/1393 ,  H01M4/1395 ,  H01M4/1397 ,  H01M4/04

Abstract: An active material particle include a lithium silicate composite particle including a lithium silicate phase, and silicon particles dispersed in the lithium silicate phase, and a first coating that covers at least a portion of a surface of the lithium silicate composite particle; wherein the first coating includes an oxide of a first element other than a non-metal element, and a carbon atom, the first coating has a thickness T1A, an element ratio Rb of the first element relative to the carbon atom at a position of 0.25T1A of the first coating from the surface of the lithium silicate composite particle, and an element ratio Rt of the first element relative to the carbon atom at a position of 0.75T1A of the first coating from the surface of the lithium silicate composite particle satisfy Rb>Rt.

公开(公告)号：US20200075936A1

公开(公告)日：2020-03-05

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 ,  H01M4/505 ,  H01M4/62 ,  H01M10/0525

Abstract: Provided is a cathode active material including 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. The covering material has an electronic conductivity of not more than 106 S/m.