Origin of Superionic Li3Y1–xInxCl6 Halide Solid Electrolytes with High Humidity Tolerance

• DOI: 10.1021/acs.nanolett.0c01156
• Publication Date: 2020-05-14T14:28:05Z
• Authors: Xiaona Li; Jianwen Liang; Keegan R. Adair; Junjie Li; Weihan Li; Feipeng Zhao; Yongfeng Hu; Tsun-Kong Sham; Li Zhang; Shangqian Zhao; Shigang Lu; Huan Huang; Ruying Li; Ning Chen; Xueliang Sun
• Keywords: 01 natural sciences; 0104 chemical sciences; 3. Good health

The high ionic conductivity, air/humidity tolerance, and related chemistry of Li3MX6 solid-state electrolytes (SSEs, M is a metal element, X halogen) has recently gained significant interest. However, most the halide SSEs suffer from irreversible chemical degradation when exposed to humid atmosphere, which originates hydrolysis. Herein, function atom in was clarified by series Li3Y1-xInxCl6 (0 ≤ x < 1). When ratio In3+ increased, gradual structural conversion hexagonal-closed-packed (hcp) anion arrangement cubic-closed-packed (ccp) been traced. Compared hcp sublattice, with ccp sublattice reveals faster Li+ migration. tolerance towards humidity highly improved content enough due formation hydrated intermediates. correlations among composition, structure, migration, stability presented this work provide insights for designing new halide-based SSEs.