A weakly coordinating-intervention strategy for modulating Na+ solvation sheathes and constructing robust interphase in sodium-metal batteries

Chutao Wang, Zongqiang Sun, Yaqing Liu, Lin Liu, Xiaoting Yin, Qing Hou, Jingmin Fan, Jiawei Yan, Ruming Yuan, Mingsen Zheng () and Quanfeng Dong ()
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Chutao Wang: Xiamen University
Zongqiang Sun: Xiamen University
Yaqing Liu: Xiamen University
Lin Liu: Xiamen University
Xiaoting Yin: Xiamen University
Qing Hou: Xiamen University
Jingmin Fan: Xiamen University
Jiawei Yan: Xiamen University
Ruming Yuan: Xiamen University
Mingsen Zheng: Xiamen University
Quanfeng Dong: Xiamen University

Nature Communications, 2024, vol. 15, issue 1, 1-14

Abstract: Abstract Constructing powerful anode/cathode interphases by modulate ion solvation structure is the principle of electrolyte design. However, the methodological and theoretical design principles of electrolyte/solvation structure and their effect on electrochemical performance are still vague. Here, we propose a cationic weakly coordinating-intervention strategy for modulating the Na+ solvation sheathes and constructing robust anode/cathode interphases in sodium-metal batteries. Unlike the local highly concentrated electrolytes, 1,2-difluorobenzene can weakly coordinate with Na+ thus transforming the solvation structure into Na+-anion-incorporated structures and strengthening anode/cathode interphases formation by combining with salt decomposition. Furthermore, the correlations between the electrode interface properties and solvation structure are revealed, which can be tuned by the weakly coordination. Ultimately, the modulated electrolyte achieves 97.5% Coulombic efficiency for 600 cycles in Na‖Cu cells at 1 mA cm−2 and a beneficial lifetime (2500 h) in Na‖Na cells. Meanwhile, Na‖PB cells have achieved long-term operation at 4.8 V, along with operation at wide temperatures.

Date: 2024
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DOI: 10.1038/s41467-024-50751-w

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