离子电导率
快离子导体
电解质
电化学
无机化学
硫化物
锂(药物)
离子键合
卤化物
电导率
材料科学
化学
离子
八面体
电化学窗口
结晶学
物理化学
晶体结构
冶金
有机化学
医学
电极
内分泌学
作者
Kaiyong Tuo,Fusheng Yin,Fanghui Mi,Chunwen Sun
标识
DOI:10.1016/j.jechem.2023.08.016
摘要
All-solid-state batteries (ASSBs) with inorganic solid-state-electrolytes (SSEs) have been regarded as the promising candidate for next-generation energy storage due to their high energy density and outstanding safety performance. However, the representative oxide and sulfide electrolytes suffer from low ionic conductivity and poor (electro)chemical stability, respectively. Herein, we report a series of new halide superionic conductors Li2+xHf1−xInxCl6 with high ionic conductivity up to 1.05 mS cm−1 at 30 °C that are simultaneously stable to high voltage. By means of the characterization techniques and bond-valence site energy (BVSE) calculation, insights into the effect of the phase transformation and underlying ionic transport mechanism by In substitution for Hf in Li2HfCl6 are provided. Importantly, with the increased amount of aliovalent substitution in Li2+xHf1−xInxCl6 microcrystal framework, a gradual structure evolution from trigonal to monoclinic phase has been observed, which is accompanied by the redistribution of Li-ions to generate two dimensionally (2D) preferable diffusion pathways through octahedral-tetrahedral-octahedral sites in In3+-substituted Li2HfCl6. Additionally, due to the oxidative stability of In-substituted Li2HfCl6, the bulk-type ASSBs with bare LiCoO2 deliver distinguished electrochemical performance.
科研通智能强力驱动
Strongly Powered by AbleSci AI