材料科学
结晶度
纳米棒
离子电导率
电化学
电化学窗口
化学工程
电解质
锂(药物)
快离子导体
聚合物
氧化物
微型多孔材料
纳米技术
化学
复合材料
电极
物理化学
工程类
内分泌学
医学
冶金
作者
Zheng Zhang,Jin‐Hai You,Shaojian Zhang,Chuanwei Wang,Yao Zhou,Jun‐Tao Li,Ling Huang,Shi‐Gang Sun
标识
DOI:10.1002/celc.201901987
摘要
Abstract Poly(ethylene oxide) (PEO), an important solid polymer electrolyte (SPE) for solid‐state lithium batteries, suffers from low ionic conductivity and poor electrochemical stability; many inorganic solid compounds have been explored as fillers to address these issues. Herein, we report that Al‐metal organic framework (MOF) nanorods could work as efficient solid fillers to boost the electrochemical performance of PEO‐based SPEs. The addition of MOF nanorods was found to inhibit the crystallization of PEO and effectively weaken the interactions among the PEO chains, resulting in evidently enhanced ionic conductivity and improved electrochemical stability; moreover, when embedded in PEO, such Al‐MOF nanorods are microporous and micrometer long, which are expected to favor the transportation of Li + over the significantly more bulky anions TFSI − . Compared with pure PEO SPE, our optimal sample PEO‐MOF 5% SPE has higher ion conductivity (2.09×10 −5 S/cm at 30 °C and 7.11×10 −4 S/cm 60 °C), a larger lithium‐ion transference number (0.46) and an enlarged electrochemical window (4.7 V versus Li/Li + ). Accordingly, the cell of LiFePO 4 /PEO‐MOF 5% /Li shows excellent cycle performance and rate performance. Our work proved the advantages of MOF particles as solid fillers towards high‐performance PEO‐based SPE, and we also put emphasis on the shape effect of the solid fillers on the lithium‐ion transference number and, thus, the electrochemical performance of the resulting SPE.
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