公开(公告)号：EP4451406A1

公开(公告)日：2024-10-23

申请号：EP23752464.0

申请日：2023-02-13

申请人： Grirem Advanced Materials Co., Ltd. ,  Rare Earth Functional Materials (Xiong'An) Innovation Center Co., Ltd. ,  Grirem Hi-Tech Co., Ltd.

发明人： HUANG, Xiaowei ,  ZHANG, Xiaobao ,  YANG, Juanyu ,  WANG, Ning ,  FENG, Zongyu ,  XU, Yang ,  ZHONG, Qiang ,  XIAO, Yiyang

IPC分类号： H01M10/0562

摘要： The present invention relates to a solid electrolyte of lithium-lanthanum-zirconium composite oxide which is doped at surface and at grain boundary, a preparation method therefor, and an application thereof. Part of doping elements are step-doped at the grain boundary and the surface of the lithium-lanthanum-zirconium composite oxide solid electrolyte to improve the distribution state of the doping elements at the grain boundaries, reduce the number of grain boundaries, lower the grain boundary resistance of the lithium-lanthanum-zirconium composite oxide, thereby obtaining high ionic conductivity. The doping method has the advantages of being simple and convenient in process, low in cost and high in universality, can meet the requirements of different solid electrolytes on doping elements, and is suitable for large-scale application. The solid electrolyte obtained from the technical solution of the present invention can be used in fields such as all-solid-state lithium or lithium ion batteries, semi-solid lithium ion batteries, lithium air batteries and the like.