In situ formation of a LiF and Li-Al alloy anode protected layer on a Li metal anode with enhanced cycle life

Lili Wang, Shiyang Fu, Teng Zhao, Ji Qian, Nan Chen, Li Li, Feng Wu, Renjie Chen*

*此作品的通讯作者

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72 引用 (Scopus)

摘要

Development of next-generation high-energy lithium (Li) metal batteries is hindered by uncontrollable growth of Li dendrites and the unstable Li/electrolyte interface during repeated Li plating/stripping. To overcome these issues, artificial protection for Li metal prior to assembling the cell/battery is needed. Here we show a facile approach to in situ coating of a protected layer on the Li metal anode by directly placing a PVDF-HFP/AlF3 modified Celgard separator on its surface. We find that AlF3 can react with highly reactive Li metal and produce a LiF coating on Li metal in situ. This LiF-rich SEI layer can effectively passivate the highly active Li anode surface and suppress the lithium dendrite growth, forming a uniform structure on the Li/electrolyte interface that reduces interfacial impedance. Owing to the enhanced interface stability, the Li‖Li cell presents a stable polarization voltage for approximately 600 h compared with the blank cell (45 h). The Li‖LiFePO4 cell with the composite separator has a high capacity retention of 78.3% after 300 cycles at the 3C rate, exhibiting an improvement in the cycling life of high energy-density Li metal batteries.

源语言英语
页(从-至)1247-1253
页数7
期刊Journal of Materials Chemistry A
8
3
DOI
出版状态已出版 - 2020

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Wang, L., Fu, S., Zhao, T., Qian, J., Chen, N., Li, L., Wu, F., & Chen, R. (2020). In situ formation of a LiF and Li-Al alloy anode protected layer on a Li metal anode with enhanced cycle life. Journal of Materials Chemistry A, 8(3), 1247-1253. https://doi.org/10.1039/c9ta10965j