单斜晶系
正交晶系
卤化物
材料科学
离子电导率
电导率
结晶学
快离子导体
晶体结构
离子键合
电解质
化学工程
离子
无机化学
化学
物理化学
有机化学
工程类
电极
作者
Juhyoun Park,Daseul Han,Hiram Kwak,Yoonjae Han,Yong Jeong Choi,Kyung Wan Nam,Yoon Seok Jung
标识
DOI:10.1016/j.cej.2021.130630
摘要
Owing to their deformability and good (electro)chemical-oxidation stability, halide superionic conductors have emerged as enablers for practical all-solid-state batteries. Herein, we report the dynamic structural evolution of Li3YbCl6, which varies with the heat treatment temperature (400 vs. 500 °C) and aliovalent substitutions with Hf4+ or Zr4+. It is observed that slight differences in Li+ conductivities (0.19 vs. 0.14 mS cm−1 at 30 °C) and activation energies (0.47 vs. 0.53 eV) between unsubstituted Li3YbCl6 heat-treated at 400 and 500 °C diverge upon aliovalent substitution, which results in the evolution of monoclinic and orthorhombic phases, respectively. Enhanced Li+ conductivities reaching 1.5 mS cm−1 with an activation energy of 0.26 eV (Li2.60Yb0.60Hf0.40Cl6 prepared at 400 °C) upon Hf4+- or Zr4+-substitution are ascribed to the optimal concentration of charge carriers of Li+ and vacancies. Importantly, the exclusive comparison of crystal structures affecting Li+ conductivity in halide superionic conductors is enabled for the first time, demonstrating that it is more favorable for the cubic close-packed (ccp) monoclinic structure as compared to the hexagonal close-packed (hcp) orthorhombic structure. Furthermore, the excellent reversibility of single-crystalline LiNi0.88Co0.11Al0.01O2 in all-solid-state cells at 30 °C was achieved by employing ccp monoclinic Li2.60Yb0.60Hf0.40Cl6 prepared at 400 °C with a capacity retention of 83.6% after 1000 cycles.
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