Revealing the Solid-State Electrolyte Interfacial Stability Model with Na–K Liquid Alloy

作     者：Xuelin Guo Dr. Yijie Liu Xiao Zhang Zhengyu Ju Dr. Yutao Li Prof. Dr. David Mitlin Prof. Dr. Guihua Yu 

作者机构：Materials Science and Engineering Program and Walker Department of Mechanical Engineering The University of Texas at Austin 204 E Dean Keeton Street Austin TX 78712 USA 

出 版 物：《Angewandte Chemie》 

年 卷 期：2022年第134卷第29期

学科分类：081704[工学-应用化学] 08[工学] 0817[工学-化学工程与技术] 

主　　题：Alkali Metal Batteries Interfacial Chemistry Liquid Metal Anode Multi-Cation Anode Solid-State Electrolyte 

摘      要：In this work, the Na–K liquid alloy with a charge selective interfacial layer is developed to achieve an impressively long cycling life with small overpotential on a sodium super-ionic conductor solid-state electrolyte (NASICON SSE). With this unique multi-cation system as the platform, we further propose a unique model that contains a chemical decomposition domain and a kinetic decomposition domain for the interfacial stability model. Based on this model, two charge selection mechanisms are proposed with dynamic chemical kinetic equilibrium and electrochemical kinetics as the manners of control, respectively, and both are validated by the electrochemical measurements with microscopic and spectroscopic characterizations. This study provides an effective design for high-energy-density solid-state battery with alkali Na–K anode, but also presents a novel approach to understand the interfacial chemical processes that could inspire and guide future designs.