AUTHOR=Cui Yongliang , Liu Sufu , Liu Bo , Wang Donghuang , Zhong Yu , Zhang Xuqing , Wang Xiuli , Xia Xinhui , Gu Changdong , Tu Jiangping 

TITLE=Bi-containing Electrolyte Enables Robust and Li Ion Conductive Solid Electrolyte Interphase for Advanced Lithium Metal Anodes

JOURNAL=Frontiers in Chemistry

VOLUME=Volume 7 - 2019

YEAR=2020

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2019.00952

DOI=10.3389/fchem.2019.00952

ISSN=2296-2646

ABSTRACT=The notorious lithium dendrite growth, causing the safety concern, hinders the practical application of high-capacity Li metal anodes for rechargeable batteries. Here, a robust and highly ionic conductive solid electrolyte interphase (SEI) layer to protect Li metal anode is in-situ constructed by introducing trace additive of tetrapotassium heptaiodobismuthate (K4BiI7) into electrolyte. The K4BiI7-added electrolyte enables Li metal anode to display a stable cycling for over 1000 h at 1.0 mAh cm‒2 with a voltage hysteresis of ~20 mV and to maintain good stability at 10 mAh cm‒2. The in-situ SEI layer modified Li anode exhibits an average Coulombic efficiency of 99.57% and less Li dendrite growth. The Li-S full sells with the modified electrolyte also show improved electrochemical performance. This research provides a cost-efficient method to achieve a highly ionic conductive and stable SEI layer toward advanced Li metal anodes.