Amorphization-induced surface electronic states modulation of cobaltous oxide nanosheets for lithium-sulfur batteries

Ruilong Li, Dewei Rao, Jianbin Zhou, Geng Wu, Guanzhong Wang, Zixuan Zhu, Xiao Han, Rongbo Sun, Hai Li, Chao Wang, Wensheng Yan, Xusheng Zheng, Peixin Cui, Yuen Wu, Gongming Wang () and Xun Hong ()
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Ruilong Li: University of Science and Technology of China
Dewei Rao: Jiangsu University
Jianbin Zhou: University of Science and Technology of China
Geng Wu: University of Science and Technology of China
Guanzhong Wang: University of Science and Technology of China
Zixuan Zhu: University of Science and Technology of China
Xiao Han: University of Science and Technology of China
Rongbo Sun: University of Science and Technology of China
Hai Li: Nanjing Technology University
Chao Wang: University of Science and Technology of China
Wensheng Yan: University of Science and Technology of China
Xusheng Zheng: University of Science and Technology of China
Peixin Cui: Chinese Academy of Sciences
Yuen Wu: University of Science and Technology of China
Gongming Wang: University of Science and Technology of China
Xun Hong: University of Science and Technology of China

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Lithium-sulfur batteries show great potential to achieve high-energy-density storage, but their long-term stability is still limited due to the shuttle effect caused by the dissolution of polysulfides into electrolyte. Herein, we report a strategy of significantly improving the polysulfides adsorption capability of cobaltous oxide by amorphization-induced surface electronic states modulation. The amorphous cobaltous oxide nanosheets as the cathode additives for lithium-sulfur batteries demonstrates the rate capability and cycling stability with an initial capacity of 1248.2 mAh g-1 at 1 C and a substantial capacity retention of 1037.3 mAh g-1 after 500 cycles. X-ray absorption spectroscopy analysis reveal that the coordination structures and symmetry of ligand field around Co atoms of cobaltous oxide nanosheets are notably changed after amorphization. Moreover, DFT studies further indicate that amorphization-induced re-distribution of d orbital makes more electrons occupy high energy level, thereby resulting in a high binding energy with polysulfides for favorable adsorption.

Date: 2021
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DOI: 10.1038/s41467-021-23349-9

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