Design towards recyclable micron-sized Na2S cathode with self-refinement mechanism

Suwan Lu, Yang Liu, Jingjing Xu (), Shixiao Weng, Jiangyan Xue, Lingwang Liu, Zhicheng Wang, Can Qian, Guochao Sun, Yiwen Gao, Qingyu Dong, Hong Li and Xiaodong Wu ()
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Suwan Lu: University of Science and Technology of China
Yang Liu: University of Science and Technology of China
Jingjing Xu: University of Science and Technology of China
Shixiao Weng: University of Science and Technology of China
Jiangyan Xue: Chinese Academy of Sciences
Lingwang Liu: University of Science and Technology of China
Zhicheng Wang: Tianmu Lake Institute of Advanced Energy Storage Technologies Co., Ltd
Can Qian: Tianmu Lake Institute of Advanced Energy Storage Technologies Co., Ltd
Guochao Sun: University of Science and Technology of China
Yiwen Gao: Chinese Academy of Sciences
Qingyu Dong: Chinese Academy of Sciences
Hong Li: Tianmu Lake Institute of Advanced Energy Storage Technologies Co., Ltd
Xiaodong Wu: University of Science and Technology of China

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Sodium sulfide (Na2S) as an initial cathode material in room-temperature sodium-sulfur batteries is conducive to get rid of the dependence on Na-metal anode. However, the micron-sized Na2S that accords with the practical requirements is obstructed due to poor kinetics and severe shuttle effect. Herein, a subtle strategy is proposed via regulating Na2S redeposition behaviours. By the synergistic effect from both conductive structure and cuprous sulfide (Cu2S) catalysis, the micron-sized Na2S particles are broken down and redeposited to nano-size during the initial cycle which can be fully utilized in subsequent cycles. Consequently, the Na2S/CPVP@Cu2S||Na cell delivers excellent cyclability (670 mAh gS−1 after 500 cycles) with a remarkable average Coulombic efficiency over 99.7% and rate capability (480 mAh gS−1 at 4 A gS−1). Besides, the Na-free anodes are used to prove the application prospects. This work provides an innovative idea for utilizing micron-sized Na2S and offers insights into its conversion pathway.

Date: 2024
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DOI: 10.1038/s41467-024-54316-9

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