Lithiophilic montmorillonite serves as lithium ion reservoir to facilitate uniform lithium deposition

Wei Chen, Yin Hu, Weiqiang Lv, Tianyu Lei, Xianfu Wang, Zhenghan Li, Miao Zhang, Jianwen Huang, Xinchuan Du, Yichao Yan, Weidong He, Chen Liu, Min Liao (), Wanli Zhang, Jie Xiong () and Chenglin Yan ()
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Wei Chen: University of Electronic Science and Technology of China
Yin Hu: University of Electronic Science and Technology of China
Weiqiang Lv: University of Electronic Science and Technology of China
Tianyu Lei: University of Electronic Science and Technology of China
Xianfu Wang: University of Electronic Science and Technology of China
Zhenghan Li: University of Electronic Science and Technology of China
Miao Zhang: University of Electronic Science and Technology of China
Jianwen Huang: University of Electronic Science and Technology of China
Xinchuan Du: University of Electronic Science and Technology of China
Yichao Yan: University of Electronic Science and Technology of China
Weidong He: University of Electronic Science and Technology of China
Chen Liu: School of Materials Science and Engineering, Xiangtan University
Min Liao: School of Materials Science and Engineering, Xiangtan University
Wanli Zhang: University of Electronic Science and Technology of China
Jie Xiong: University of Electronic Science and Technology of China
Chenglin Yan: Soochow University

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract The growing demand for lithium batteries with higher energy densities requires new electrode chemistries. Lithium metal is a promising candidate as the anode material due to its high theoretical specific capacity, negative electrochemical potential and favorable density. However, during cycling, low and uneven lithium ion concentration on the surface of anode usually results in uncontrolled dendrite growth, especially at high current densities. Here we tackle this issue by using lithiophilic montmorillonite as an additive in the ether-based electrolyte to regulate the lithium ion concentration on the anode surface and thus facilitate the uniform lithium deposition. The lithiophilic montmorillonite demonstrates a pumping feature that improves the self-concentrating kinetics of the lithium ion and thus accelerates the lithium ion transfer at the deposition/electrolyte interface. The signal intensity of TFSI− shows negligible changes via in situ Raman tracking of the ion flux at the electrochemical interface, indicating homogeneous ion distribution, which can lead to a stable and uniform lithium deposition on the anode surface. Our study indicates that the interfacial engineering induced by the lithiophilic montmorillonite could be a promising strategy to optimize the lithium deposition for next-generation lithium metal batteries.

Date: 2019
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DOI: 10.1038/s41467-019-12952-6

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