公开(公告)号：US20230246183A1

公开(公告)日：2023-08-03

申请号：US18007789

申请日：2021-06-02

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Jo SAITO ,  Yohei MOMMA ,  Mayumi MIKAMI ,  Teruaki OCHIAI ,  Yusuke YOSHITANI ,  Azusa KIKUCHI ,  Kazuhei NARITA

IPC: H01M4/525 ,  H01M4/36 ,  H01M4/131 ,  C01G53/00

CPC classification number: H01M4/525 ,  H01M4/366 ,  H01M4/131 ,  C01G53/66 ,  H01M2004/028

Abstract: According to one embodiment of the present invention, a positive electrode active material with high charge and discharge capacity is provided. Alternatively, a positive electrode active material with high charge and discharge voltage is provided. Alternatively, a positive electrode active material with little deterioration is provided. To improve the reliability of the positive electrode active material, the surface of the positive electrode active material is prevented from reacting with an electrolyte solution and being reduced. The provision of a projection on part of the positive electrode active material surface decreases the reduction of the positive electrode active material surface from reacting with the electrolyte solution, thereby improving the cycle performance.