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Tailoring fluorine-rich solid electrolyte interphase to boost high efficiency and long cycling stability of lithium metal batteries

引用

Science China Chemistry 2023年第7期66卷 2121-2129页

作者： Tianyang Xue Ji Qian Xingming Guo Yi Chen Kaixin Yu Tianyang Yu Yao li li li Feng Wu Renjie Chen Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Institute of Advanced Technology Beijing Institute of TechnologyJinan 250300China Collaborative Innovation Center of Electric Vehicles in Beijing Beijing 100081China

lithium metal batteries(LMBs)are regarded as the most promising next-generation battery system due to their high energy ***,li dendrite growth and low Coulombic efficiency(CE)of li metal anodes limit their *** solid electrolyte interphase(SEI)is an extremely effective method to solve these problems and using electrolyte additives to regulate the SEI is one of the most effective ***,we study the feasibility of trans-difluoroethylene carbonate(DFEC)used as the solvent additive in conventional ether electrolyte,which has excellent anti-reduction stability against li *** result shows that a li/Cu half-cell with the modified electrolyte can be steadily cycled for 300 cycles with an average CE of 97.41%at the current density of 0.5 m A cm^(-2)and with 97.1%for 140 cycles at 1 m A cm^(-2).Besides,the li/LFP full cell with the modified electrolyte displays an improved capacity retention of 94.55%after 520 cycles with an average CE of 99.74%at 1 *** contrast,the capacity retention of 56.2%and CE of 99.15%is obtained for the cell with pure ether *** SEM images show that the DFEC enables dense li deposition,and the FTIR and XPS spectra confirm the formation of li Frich SEI with the *** work demonstrates the feasibility of using DFEC as the solvent additive in ether electrolyte to construct li F-rich SEI,and it will provide important insight in developing high-performance electrolytes for LMBs.

关键词： lithium metal batteries ether electrolyte trans-difluoroethylene carbonate liF-rich SEI dense li deposition

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