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Dendrite‐Free Sodium Metal Anodes Enabled by a Sodium Benzenedithiolate‐Rich Protection Layer
Author(s) -
Zhu Ming,
Wang Guanyao,
Liu Xing,
Guo Bingkun,
Xu Gang,
Huang Zhongyi,
Wu Minghong,
Liu HuaKun,
Dou ShiXue,
Wu Chao
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201916716
Subject(s) - electrolyte , anode , sodium , plating (geology) , dendrite (mathematics) , metal , layer (electronics) , chemistry , inorganic chemistry , electrochemistry , chemical engineering , materials science , stripping (fiber) , electrode , nanotechnology , organic chemistry , composite material , geometry , mathematics , geophysics , engineering , geology
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 (PhS 2 Na 2 )‐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, PhS 2 Na 2 , 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.