Stabilizing lithium metal anode by octaphenyl polyoxyethylene-lithium complexation

Hongliu Dai, Xingxing Gu, Jing Dong, Chao Wang, Chao Lai () and Shuhui Sun
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Hongliu Dai: Jiangsu Normal University
Xingxing Gu: Chongqing Technology and Business University
Jing Dong: Jiangsu Normal University
Chao Wang: Jiangsu Normal University
Chao Lai: Jiangsu Normal University
Shuhui Sun: Materials and Telecommunications

Nature Communications, 2020, vol. 11, issue 1, 1-11

Abstract: Abstract Lithium metal is an ideal anode for lithium batteries due to its low electrochemical potential and high theoretical capacity. However, safety issues arising from lithium dendrite growth have significantly reduced the practical applicability of lithium metal batteries. Here, we report the addition of octaphenyl polyoxyethylene as an electrolyte additive to enable a stable complex layer on the surface of the lithium anode. This surface layer not only promotes uniform lithium deposition, but also facilitates the formation of a robust solid-electrolyte interface film comprising cross-linked polymer. As a result, lithium|lithium symmetric cells constructed using the octaphenyl polyoxyethylene additive exhibit excellent cycling stability over 400 cycles at 1 mA cm−2, and outstanding rate performance up to 4 mA cm−2. Full cells assembled with a LiFePO4 cathode exhibit high rate capability and impressive cyclability, with capacity decay of only 0.023% per cycle.

Date: 2020
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DOI: 10.1038/s41467-020-14505-8

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