多硫化物
电解质
钾
电导率
离子电导率
活化能
快离子导体
电池(电)
化学
硫化物
无机化学
离子
导线
分析化学(期刊)
材料科学
物理化学
电极
热力学
环境化学
复合材料
功率(物理)
有机化学
物理
作者
Jieren Shao,Jingfeng Zheng,Lei Qin,Songwei Zhang,Yang Ren,Yiying Wu
标识
DOI:10.1002/anie.202200606
摘要
Solid-state K-ion conducting electrolytes are key elements to address the current problems in K secondary batteries. Here, we report a sulfide-based K-ion conductor K3 SbS4 with a low-activation energy of 0.27 eV. W-doped K3-x Sb1-x Wx S4 (x=0.04, 0.06, 0.08, 0.10 and 0.12) compounds were also explored for increasing vacancy concentrations and improving ionic conductivity. Among them, K2.92 Sb0.92 W0.08 S4 exhibits the highest conductivity of 1.4×10-4 S cm-1 at 40 °C, which is among the best reported potassium-ion conductors at ambient temperature. In addition, K2.92 Sb0.92 W0.08 S4 is electrochemically stable with long-chained potassium polysulfide of K2 Sx . A room-temperature solid potassium-sulfur (K-S) battery system has therefore been successfully demonstrated, which is the first K-S battery prototype using non-commercial inorganic-based electrolyte to block the polysulfide shuttle.
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