Surface modification using heptafluorobutyric acid to produce highly stable Li metal anodes

Yuxiang Xie, Yixin Huang, Yinggan Zhang, Tairui Wu, Shishi Liu, Miaolan Sun, Bruce Lee, Zhen Lin, Hui Chen, Peng Dai, Zheng Huang, Jian Yang, Chenguang Shi, Deyin Wu, Ling Huang (), Yingjie Hua, Chongtai Wang () and Shigang Sun ()
Additional contact information
Yuxiang Xie: Xiamen University
Yixin Huang: Xiamen University
Yinggan Zhang: Xiamen University, Xiamen Key Laboratory of Electronic Ceramic Materials and Devices
Tairui Wu: Xiamen University
Shishi Liu: Xiamen University
Miaolan Sun: Xiamen University
Bruce Lee: Contemporary Amperex Technology Co., Limited.
Zhen Lin: Contemporary Amperex Technology Co., Limited.
Hui Chen: Xiamen University
Peng Dai: Xiamen University
Zheng Huang: Xiamen University
Jian Yang: Xiamen University
Chenguang Shi: Xiamen University
Deyin Wu: Xiamen University
Ling Huang: Xiamen University
Yingjie Hua: Hainan Normal University, Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province
Chongtai Wang: Hainan Normal University, Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province
Shigang Sun: Xiamen University

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

Abstract: Abstract The Li metal is an ideal anode material owing to its high theoretical specific capacity and low electrode potential. However, its high reactivity and dendritic growth in carbonate-based electrolytes limit its application. To address these issues, we propose a novel surface modification technique using heptafluorobutyric acid. In-situ spontaneous reaction between Li and the organic acid generates a lithiophilic interface of lithium heptafluorobutyrate for dendrite-free uniform Li deposition, which significantly improves the cycle stability (Li/Li symmetric cells >1200 h at 1.0 mA cm−2) and Coulombic efficiency (>99.3%) in conventional carbonate-based electrolytes. This lithiophilic interface also enables full batteries to achieve 83.2% capacity retention over 300 cycles under realistic testing condition. Lithium heptafluorobutyrate interface acts as an electrical bridge for uniform lithium-ion flux between Li anode and plating Li, which minimizes the occurrence of tortuous lithium dendrites and lowers interface impedance.

Date: 2023
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DOI: 10.1038/s41467-023-38724-x

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