多硫化物
材料科学
电解质
离子电导率
结晶度
阳极
环氧乙烷
化学工程
锂(药物)
氧化物
复合数
聚合物
复合材料
电极
冶金
化学
共聚物
物理化学
内分泌学
工程类
医学
作者
Yuchen Ji,Kai Yang,Mingqiang Liu,Shiming Chen,Xinhua Liu,Biao Yang,Zijian Wang,Weiyuan Huang,Zhibo Song,Shida Xue,Yanda Fu,Luyi Yang,Thomas S. Miller,Feng Pan
标识
DOI:10.1002/adfm.202104830
摘要
Abstract Poly(ethylene oxide) (PEO) is a promising solid electrolyte material for solid‐state lithium–sulfur (Li–S) batteries, but low intrinsic ionic conductivity, poor mechanical properties, and failure to hinder the polysulfide shuttle effect limits its application. Herein, a polymer of intrinsic microporosity (PIM) is synthesized and applied as an organic framework to comprehensively enhance the performance of PEO by forming a composite electrolyte (PEO‐PIM). The unique structure of PIM‐1 not only enhances the mechanical strength and hardness over the PEO electrolyte by an order of magnitude, increasing stability toward the metallic lithium anode but also increases its ionic conductivity by lowering the degree of crystallinity. Furthermore, the PIM‐1 is shown to effectively trap lithium polysulfide species to mitigate against the detrimental polysulfide shuttle effect, as electrophilic 1,4‐dicyanooxanthrene functional groups possess higher binding energy to polysulfides. Benefiting from these properties, the use of PEO‐PIM composite electrolyte has achieved greatly improved rate performance, long‐cycling stability, and excellent safety features for solid‐state Li‐S batteries. This methodology offers a new direction for the optimization of solid polymer electrolytes.
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