Protection of Li metal anode by surface-coating of PVDF thin film to enhance the cycling performance of Li batteries |
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Authors: | Zhenguang Gao Shaojian Zhang Zhigen Huang Yanqiu Lu Weiwei Wang Kai Wang Juntao Li Yao Zhou Ling Huang Shigang Sun |
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Institution: | College of Energy, Xiamen University, Xiamen 361005, China; College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China; Institute of Nanotechnology (INT), karlsruhe Institute of (KIT), Eggenstein-Lepoldshafen D-76344, Germany |
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Abstract: | Lithium metal, the ideal anode material for next-generation high-energy batteries, suffers from the severe safety problem of Li dendrites. Herein, we report a simple approach to effectively maintain the morphology of Li-metal anode and enhance the cycling performance of Li batteries by surface coating of a porous polyvinylidene fluoride (PVDF) thin film. In symmetrical cells testing, the cells with the Li@PVDF electrode display stable cycling performance more than 1300 h (650 cycles) at the current density of 0.5 mA/cm2 with a stripping/plating capacity of 0.5 mAh/cm2. The results with full cells employing Li@PVDF anode and LiFePO4 cathode show a good cycling ability with a capacity retention of 80.0% after 500 cycles at 4 C and an excellent rate capability with a high capacity of 78.4 mA h/g even at a high rate of 10 C. |
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Keywords: | Li metal anode Surface-coating PVDF thin film Li dendrites Cycling performance |
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