Premium
A Multilayer Ceramic Electrolyte for All‐Solid‐State Li Batteries
Author(s) -
Zhu Jianxun,
Li XiaoLei,
Wu Changwei,
Gao Jian,
Xu Henghui,
Li Yutao,
Guo Xiangxin,
Li Hong,
Zhou Weidong
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202014265
Subject(s) - materials science , electrolyte , ceramic , metal , chemical engineering , composite material , metallurgy , electrode , chemistry , engineering
Despite of the good stability with Li‐metal, Li 6.75 La 3 Zr 1.75 Ta 0.25 O 12 (LLZTO) suffers from large interfacial resistance and severe Li‐metal penetration. Herein, a dual layer ceramic electrolyte of Ti‐doped LLZTO(Ti‐LLZTO)/LLZTO was developed, with the reducible Ti‐LLZTO layer contacting Li‐metal and the LLZTO layer contacting cathode. The identical crystal structures of Ti‐LLZTO and LLZTO enables a seamless contact and a barrierless Li + transport between them. The densities of Ti‐LLZTO pellets are higher than that of LLZTO. With an in situ reduction of Ti‐LLZTO by Li‐metal, the interfacial wettability was improved and a mixed ion‐electron conducting layer was created. Both features help to reduce defects/pores on interface and homogenize the interfacial ionic/electronic flux, facilitating the reduction of interfacial resistance and suppression of dendrites. With the help of Ti‐LLZTO layer, long‐term stable lithium plating/stripping was reached in an areal capacity of 3.0 mAh cm −2 .