碱金属
离子键合
离子半径
材料科学
格子(音乐)
快离子导体
结构稳定性
八面体
密度泛函理论
电解质
钙钛矿(结构)
热力学
金属
晶格能
离子
化学物理
物理化学
化学
计算化学
结晶学
物理
晶体结构
工程类
有机化学
冶金
结构工程
声学
电极
作者
Kwang Nam Kim,Yiliang Li,Pei-Hsun Tsai,Fei Wang,Seoung‐Bum Son,Yet‐Ming Chiang,Donald J. Siegel
标识
DOI:10.1021/acs.chemmater.1c02150
摘要
The development of solid-state batteries has been slowed by limited understanding of the features that control ion mobility in solid electrolytes (SEs). In the case of anti-perovskite (AP) SE, lattice distortions have been proposed as one such controlling factor: APs that exhibit distortions of the octahedral building blocks are predicted to exhibit enhanced ionic mobility. Nevertheless, large distortions come at the cost of stability, implying a tradeoff between stability and ionic mobility. The present study combines theory and experiments to explore the synthesizability of several marginally stable APs predicted to exhibit high mobility for Li+, Na+, and K+. Density functional theory calculations, in combination with the quasi-harmonic approximation, were used to predict the free energy change, ΔGr(T), for synthesis reactions involving 36 alkali metal-based APs, X3AZ (X = Li, Na, or K; A = O, S, or Se; and Z = F, Cl, Br, or I). A linear correlation is observed between the degree of lattice distortion and the stabilization temperature, at which ΔGr(T) = 0. Hence, APs with the highest ionic mobility generally require the highest synthesis temperature. These data were used to guide experimental synthesis efforts of APs by estimating the temperatures above which a given AP is expected to be thermodynamically stable. Attempts were made to synthesize several AP compositions; overall, good agreement is obtained between experiments and computation. These data suggest that a compound’s zero K decomposition energy is an efficient descriptor for predicting the ease and likelihood of synthesizing new SEs.
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