卤化物
电解质
离子电导率
介电谱
晶界
材料科学
晶界扩散系数
快离子导体
离子键合
电化学
电导率
化学
物理化学
分析化学(期刊)
离子
无机化学
冶金
微观结构
电极
有机化学
色谱法
作者
Zhantao Liu,Shuan Ma,Jue Liu,Shan Xiong,Yuhui Ma,Hailong Chen
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2020-12-30
卷期号:6 (1): 298-304
被引量:90
标识
DOI:10.1021/acsenergylett.0c01690
摘要
The development of all-solid-state batteries is limited by the low ionic conductivity of solid electrolytes. Beyond sulfides and oxides, halides represent another family of solid electrolytes with high Li+ conductivity and good stability. Here we report the design, synthesis, electrochemical testing, and crystal structure characterization of a halide compound, Li3Y(Br3Cl3). A room-temperature conductivity of 7.2 mS/cm is achieved in Li3Y(Br3Cl3) via hot-pressing at 170 °C. Crystal structure characterizations using synchrotron X-ray and neutron diffraction reveal the existence of Li at the tetrahedral sites and the 3D diffusion pathways. Electrochemical impedance spectroscopy results reveal the improved grain boundary contact and the lower grain boundary resistance after the hot-pressing process, which also boost the overall conductivity. All-solid-state batteries using Li3Y(Br3Cl3) as the electrolyte demonstrate high capacity and good rate performance at room temperature. The new findings open up opportunities for the design of halide ionic conductors and the development of all-solid-state batteries.
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