电解质
锂(药物)
环氧乙烷
电化学
聚合物
材料科学
金属
氧化物
化学工程
离子键合
电导率
高分子化学
无机化学
离子
化学
电极
离子电导率
有机化学
冶金
复合材料
工程类
物理化学
内分泌学
医学
共聚物
作者
Ruogu Xu,Shengjun Xu,Fei Wang,Ran Xiao,Pei Tang,Xiaoyin Zhang,Shuo Bai,Ze Sun,Feng Li
标识
DOI:10.1002/sstr.202200206
摘要
Poly(ethylene oxide) (PEO) is among the most promising candidates for solid‐state electrolytes in lithium metal batteries. However, the low ionic conductivity caused by strong coordination between Li ions and the EO chains limits the practical application of PEO‐based electrolytes. Herein, a double crosslinked PEO‐based electrolyte with alternate C–S–C groups and functionalized metal–organic frameworks (MOFs) is proposed. The incorporation of C–S–C groups not only accelerates Li ions transport by weakening the coordination between Li ions and polymer backbone, but also facilitates segmental relaxation of the polymer backbone. The PEO‐based electrolyte with C–S–C groups shows a remarkable 13‐fold increase in ionic conductivity. Furthermore, when functionalized MOFs are used as crosslinked centers, the double‐crosslinked PEO‐based electrolyte with a robust network structure possesses enhanced mechanical/electrochemical/thermal stability and limited anion transmission. As a result, the symmetrical Li||Li cell enables over 2400 h cycling at room temperature. The LiFePO 4 ||Li cells show long cycle life over a wide temperature range from 25 to 100 °C, and a high areal capacity of 1.43 mAh cm −2 is achieved with a cathode loading of 10.0 mg cm −2 . This study demonstrates a promising strategy to develop advanced electrolytes for potential solid‐state lithium‐metal batteries.
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