A corrosion inhibiting layer to tackle the irreversible lithium loss in lithium metal batteries

Chengbin Jin (), Yiyu Huang, Lanhang Li, Guoying Wei, Hongyan Li, Qiyao Shang, Zhijin Ju, Gongxun Lu, Jiale Zheng, Ouwei Sheng () and Xinyong Tao ()
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Chengbin Jin: China Jiliang University
Yiyu Huang: China Jiliang University
Lanhang Li: China Jiliang University
Guoying Wei: China Jiliang University
Hongyan Li: China Jiliang University
Qiyao Shang: Zhejiang University of Technology
Zhijin Ju: Zhejiang University of Technology
Gongxun Lu: Zhejiang University of Technology
Jiale Zheng: Zhejiang University of Technology
Ouwei Sheng: Hangzhou Dianzi University
Xinyong Tao: Zhejiang University of Technology

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Reactive negative electrodes like lithium (Li) suffer serious chemical and electrochemical corrosion by electrolytes during battery storage and operation, resulting in rapidly deteriorated cyclability and short lifespans of batteries. Li corrosion supposedly relates to the features of solid-electrolyte-interphase (SEI). Herein, we quantitatively monitor the Li corrosion and SEI progression (e.g., dissolution, reformation) in typical electrolytes through devised electrochemical tools and cryo-electron microscopy. The continuous Li corrosion is validated to be positively correlated with SEI dissolution. More importantly, an anti-corrosion and interface-stabilizing artificial passivation layer comprising low-solubility polymer and metal fluoride is designed. Prolonged operations of Li symmetric cells and Li | |LiFePO4 cells with reduced Li corrosion by ~74% are achieved (0.66 versus 2.5 μAh h−1). The success can further be extended to ampere-hour-scale pouch cells. This work uncovers the SEI dissolution and its correlation with Li corrosion, enabling the durable operation of Li metal batteries by reducing the Li loss.

Date: 2023
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DOI: 10.1038/s41467-023-44161-7

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