High Rate Performance of Li Metal Anode in Na-Containing so2-Based Inorganic Electrolyte

Abstract

Lithium metal anode is one of the best candidates for the next generation energy storage systems due to the lowest electrochemical potential (- 3.04 V vs. standard hydrogen electrode) and the highest theoretical capacity (3860 mAh g-1). However, lithium metal anode have critical problems including dendritic growth of Li deposits during cycling, poor stability of solid electrolyte interface (SEI) on lithium metal anode and severe chemical reaction between Li metal and the electrolyte. Recently, stable artificial interface layers on the Li metal anode have been proposed to solve these problems. In this work, surface modification of Li metal with a Na-containing SO2-based inorganic electrolyte was investigated as an effective way to prevent lithium dendritic growth during cell operation. The surface-modified lithium metal anode effectively prevented the dendritic deposits of Li deposits even at high current density (3 mA cm-2). More detailed reaction chemistry of Li metal with Na-containing inorganic electrolyte will be discussed in the presentation.