公开(公告)号：US20230282824A1

公开(公告)日：2023-09-07

申请号：US18186952

申请日：2023-03-21

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Haotian Xie ,  Peipei Chen ,  Xin Sun ,  Bangrun Wang ,  Jiantao Huang ,  Xingbu Chen ,  Xiao Chen ,  Na Liu ,  Chengdu Liang

IPC: H01M4/525 ,  H01M10/0525 ,  H01M4/485 ,  H01M4/505 ,  H01M10/0568 ,  H01M4/58 ,  H01M4/04 ,  H01M50/207

CPC classification number: H01M4/525 ,  H01M10/0525 ,  H01M4/485 ,  H01M4/505 ,  H01M10/0568 ,  H01M4/5825 ,  H01M4/0404 ,  H01M50/207 ,  H01M2004/028

Abstract: A lithium ion secondary battery and a preparation method therefor, a battery module, a battery pack, and a device are provided. In some embodiments, the lithium ion secondary battery comprises a positive electrode plate, a negative electrode plate and an electrolyte, wherein the positive electrode plate comprises a positive electrode active material and a positive electrode lithium-supplementing material comprising a lithium-rich metal oxide, and the lithium-rich metal oxide comprises one or more elements of Ni, Co, Fe, Mn, and Cu; the electrolyte comprises an electrolyte lithium salt and a solvent, and has a percentage ε of the total mass of a fluorine element in the anions of the electrolyte lithium salt relative to the total mass of the electrolyte of