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Protection of Li metal anode by surface-coating of PVDF thin film to enhance the cycling performance of Li batteries

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Chinese Chemical Letters 2019年第2期30卷 525-528页

作者： Zhenguang Gao Shaojian Zhang Zhigen Huang Yanqiu Lu Weiwei Wang Kai Wang Juntao Li Yao Zhou Ling Huang Shigang Sun College of Energy Xiamen University College of Chemistry and Chemical Engineering Xiamen University Institute of Nanotechnology (INT) karlsruhe Institute of (KIT)

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/cm^2 with a stripping/plating capacity of 0.5 mAh/cm^2. The results with full cells employing Li@PVDF anode and LiFePO_4 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 mAh/g even at a high rate of 10 C.

关键词： Li metal anode surface-coating PVDF thin film Li dendrites Cycling performance

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LiFePO_(4) as a dual-functional coating for separators in lithium-ion batteries:A new strategy for improving capacity and safety

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Journal of Energy Chemistry 2023年第11期86卷 490-498,I0010页

作者： Modeste Venin Mendieev Nitou Yashuai Pang Zhao Wan Wenjun Li Zhuohang Zhong Waqas Muhammad Saeed Muhammad Sohail Muhammad Yinghua Niu Weiqiang Lv School of Physics University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313001ZhejiangChina

Lithium-ion batteries(LIBs)require separators with high performance and safety to meet the increasing demands for energy storage *** electrochemically inert ceramic materials on conventional polyolefin separators can enhance stability but comes at the cost of increased weight and decreased capacity of the ***,a novel separator coated with lithium iron phosphate(LFP),an active cathode material,is developed via a simple and scalable *** LFP-coated separator exhibits superior thermal stability,mechanical strength,electrolyte wettability,and ionic conductivity than the conventional polyethylene(PE)***,the LFP coating can actively participate in the electrochemical reaction during the charge-discharge process,thus enhancing the capacity of the *** results show that the LFP-coated separator can increase the cell capacity by 26%,and improve the rate capability by 29%at 4 C compared with the conventional PE *** LFP-coated separator exhibits only 1.1%thermal shrinkage at 140°C,a temperature even above the melting point of *** work introduces a new strategy for designing separators with dual functions for the next-generation LIBs with improved performance and safety.

关键词： Lithium-ion batteries Separator surface-coating LiFePO_(4) Safety

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