Dendrite‐Free Sodium Metal Anodes Enabled by a Sodium Benzenedithiolate‐Rich Protection Layer

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 p...

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Published inAngewandte Chemie International Edition Vol. 59; no. 16; pp. 6596 - 6600
Main Authors Zhu, Ming, Wang, Guanyao, Liu, Xing, Guo, Bingkun, Xu, Gang, Huang, Zhongyi, Wu, Minghong, Liu, Hua‐Kun, Dou, Shi‐Xue, Wu, Chao
Format Journal Article
LanguageEnglish
Published Germany Wiley Subscription Services, Inc 16.04.2020
EditionInternational ed. in English
Subjects
Anodes
Anodic protection
Batteries
Critical components
dendrite prevention
Dendritic structure
Electrode materials
Electrolytes
Metals
Organic salts
Plating
protection layer
Rechargeable batteries
Slats
Sodium
sodium benzenedithiolate
sodium metal
Solid electrolytes
protection layer
sodium benzenedithiolate
dendrite prevention
sodium metal
rechargeable batteries
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Summary: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. A sodium benzenedithiolate (PhS2Na2)‐rich protection layer synthesized in situ on sodium by a facile method effectively prevents dendrite growth in 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.
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ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201916716