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Issue 3, 2020
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In situ formation of a LiF and Li–Al alloy anode protected layer on a Li metal anode with enhanced cycle life

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Abstract

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.

Graphical abstract: In situ formation of a LiF and Li–Al alloy anode protected layer on a Li metal anode with enhanced cycle life

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Supplementary files

Article information


Submitted
05 Oct 2019
Accepted
06 Dec 2019
First published
06 Dec 2019

J. Mater. Chem. A, 2020,8, 1247-1253
Article type
Paper

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

L. Wang, S. Fu, T. Zhao, J. Qian, N. Chen, L. Li, F. Wu and R. Chen, J. Mater. Chem. A, 2020, 8, 1247
DOI: 10.1039/C9TA10965J

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