电解质
四方晶系
结构精修
介电谱
快离子导体
离子电导率
离子
法拉第效率
相(物质)
化学
电化学
材料科学
固溶体
分析化学(期刊)
电极
结晶学
晶体结构
物理化学
冶金
有机化学
色谱法
作者
De-Chao Zhang,Xiaoting Cao,Di Xu,Ning Wang,Chuang Yu,Wentao Hu,Xinlin Yan,Jianli Mi,Bin Wen,Limin Wang,Long Zhang
标识
DOI:10.1016/j.electacta.2017.10.173
摘要
A comprehensive research coupling experiment and computation has been performed to understand the phase transition of Na3SbS4 and to synthesize cubic Na3SbS4 (c-Na3SbS4), a high temperature phase of Na3SbS4 that is difficult to be preserved when cooled down to ambient temperature. The formation of c-Na3SbS4 is verified by Rietveld refinement, nuclear magnetic resonance spectroscopy as well as electrochemical impedance spectroscopy. Unlike tetragonal Na3SbS4 (t-Na3SbS4) appearing phase transition at high temperature, c-Na3SbS4 is stable not just at room temperature but also sustaining thermal cycling up to at least 200 °C. Both experiment and theoretical calculation reveal that the ionic conductivity of c-Na3SbS4 is higher than that of t-Na3SbS4, though the values are in the same order of magnitude. Both structures allow fast ion transport. All-solid-state cells with c-Na3SbS4 solid electrolyte demonstrate superior Coulombic efficiency, high specific capacity, and relatively good cycling stability. Na3SbS4 solid electrolyte is promising for all-solid-state sodium-ion batteries.
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