公开(公告)号：US20210083274A1

公开(公告)日：2021-03-18

申请号：US17108810

申请日：2020-12-01

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Takayuki ISHIKAWA ,  Ryuichi NATSUI ,  Issei IKEUCHI ,  Kensuke NAKURA

IPC: H01M4/36 ,  H01M4/505 ,  H01M4/525 ,  H01M4/48 ,  H01M10/0525 ,  C01G45/12 ,  H01M4/62 ,  C01G53/00 ,  C01G51/00

Abstract: A positive electrode active material includes a lithium composite oxide and a covering material that covers a surface of the lithium composite oxide. The covering material has an electron conductivity of 106 S/m or less. The lithium composite oxide is a multiphase mixture including a first phase having a first crystal structure that belongs to a space group Fm-3m and a second phase having a second crystal structure that belongs to a space group other than a space group Fm-3m. The ratio I(18°-20°)/I(43°-46°) of a first integrated intensity I(18°-20°) of a first maximum peak present at a first diffraction angle 2θ of 18° or more and 20° or less to a second integrated intensity I(43°-46°) of a second maximum peak present at a second diffraction angle 2θ of 43° or more and 46° or less in an XRD pattern of the lithium composite oxide satisfies 0.05≤I(18°-20°)/I(45°-46°)≤0.90.