期刊
JOURNAL OF MATERIALS SCIENCE
卷 53, 期 15, 页码 11038-11049出版社
SPRINGER
DOI: 10.1007/s10853-018-2353-x
关键词
-
资金
- Natural Science Foundation of Zhejiang Province [LY15B020003]
- Ningbo Natural Science Foundation [2015A610243]
Single-ion conducting polymers have been widely reported in the literature as solid polymer electrolytes, but their low ionic conductivity has limited industrial applications at ambient temperature. Here, we employed a perfluoroalkyl sulfonamide-based single-ion conducting polymer-lithiated poly(perfluoroalkylsulfonyl)imide (LiPFSI) to promote the migration of free Li-ions and diminish cell polarization in lithium-ion batteries. After blending with Al2O3 powder, the LiPFSI/Al2O3 composite was coated on a commercial polyethylene separator. Adding the high surface energy of Al2O3 particles and the exceptional ionic conductivity of LiPFSI resulted in a LiPFSI/Al2O3 composite-coated separator with excellent wettability and low impedance. A LiFePO4/Li half-cell with this separator showed a highly improved charge-discharge cyclability up to 130 mAh/g that maintained 98% retention of the original reversible capacity after 220 charge-discharge cycles at a high current rate of 2 C (1 C = 170 mAh/g). Even at a high rate of 5 C, the cell capacity could be maintained above 100 mAh/g. Herein, we present a simple and effective method to optimize the separator with the LiPFSI/Al2O3 composite and thus improve the high rate charge-discharge performance of Li-ion batteries.
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