Dendrite-Free Sodium Metal Anodes Enabled by a Sodium Benzenedithiolate-Rich Protection Layer |
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| Authors: | Ming Zhu Dr. Guanyao Wang Dr. Xing Liu Prof. Bingkun Guo Prof. Gang Xu Zhongyi Huang Prof. Minghong Wu Prof. Hua-Kun Liu Prof. Shi-Xue Dou Dr. Chao Wu |
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| Affiliation: | 1. School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444 China;2. Materials Genome Institute, Shanghai University, Shanghai, 200444 China;3. Institute for Superconducting & Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, Wollongong, NSW, 2522 Australia |
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| Abstract: | Sodium metal is an ideal anode material for metal rechargeable batteries, owing to its high theoretical capacity (1166 mAh g−1), low cost, and earth-abundance. However, the dendritic growth upon Na plating, stemming from unstable solid electrolyte interphase (SEI) film, is a major and most notable problem. Here, a sodium benzenedithiolate (PhS2Na2)-rich protection layer is synthesized in situ on sodium by a facile method that effectively prevents dendrite growth in the carbonate electrolyte, leading to stabilized sodium metal electrodeposition for 400 cycles (800 h) of repeated plating/stripping at a current density of 1 mA cm−2. The organic salt, PhS2Na2, is found to be a critical component in the protection layer. This finding opens up a new and promising avenue, based on organic sodium slats, to stabilize sodium metals with a protection layer. |
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| Keywords: | Dendrit-Schutz Schutzschicht Wiederaufladbare Batterien Natriumbenzoldithiolat Natrium-Metall |
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