材料科学
电解质
离子电导率
化学工程
法拉第效率
电化学
氧化物
锂硫电池
聚合物
锂(药物)
阳极
电导率
复合数
电池(电)
纳米复合材料
多硫化物
环氧乙烷
复合材料
电极
化学
冶金
功率(物理)
物理化学
内分泌学
工程类
物理
医学
量子力学
共聚物
作者
Xue Li,Donghao Wang,Hongchun Wang,Hefeng Yan,Zhengliang Gong,Yong Yang
标识
DOI:10.1021/acsami.9b05212
摘要
Composite polymer electrolyte membranes are fabricated by the incorporation of Li10SnP2S12 into the poly(ethylene oxide) (PEO) matrix using a solution-casting method. The incorporation of Li10SnP2S12 plays a positive role on Li-ionic conductivity, mechanical property, and interfacial stability of the composite electrolyte and thus significantly enhances the electrochemical performance of the solid-state Li–S battery. The optimal PEO–1%Li10SnP2S12 electrolyte presents a maximum ionic conductivity of 1.69 × 10–4 S cm–1 at 50 °C and the highest mechanical strength. The possible mechanism for the enhanced electrochemical performance and mechanical property is analyzed. The uniform distribution of Li10SnP2S12 in the PEO matrix inhibits crystallization and weakens the interactions among the PEO chains. The PEO–1%Li10SnP2S12 electrolyte exhibits lower interfacial resistance and higher interfacial stability with the lithium anode than the pure PEO/LiTFSI electrolyte. The Li–S cell comprising the PEO–1%Li10SnP2S12 electrolyte exhibits outstanding electrochemical performance with a high discharge capacity (ca. 1000 mA h g–1), high Coulombic efficiency, and good cycling stability at 60 °C. Most importantly, the PEO–1%Li10SnP2S12-based cell possesses attractive performance with a high specific capacity (ca. 800 mA h g–1) and good cycling stability even at 50 °C, whereas the PEO/LiTFSI-based cell cannot be successfully discharged because of the low ionic conductivity and high interfacial resistance of the PEO/LiTFSI electrolyte.
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