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

Dendrite-Free Sodium Metal Anodes Enabled by a Sodium Benzenedithiolate-Rich Protection Layer
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由富含苯二硫醇钠的保护层实现的无枝晶钠金属阳极

DOI:
10.1002/anie.201916716
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发表时间:
2020
期刊:
Angewandte Chemie International Edition
影响因子:
--
通讯作者:
Wu Chao
Wu Chao
中科院分区:
其他
文献类型:
--
作者:
Zhu Ming;Wang Guanyao;Liu Xing;Guo Bingkun;Xu Gang;Huang Zhongyi;Wu Minghong;Liu Hua-Kun;Dou Shi-Xue;Wu Chao

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金属钠是金属可充电电池的理想阳极材料,由于其高理论容量(1166 mAh g−1),低成本和地球丰度。 然而,由于不稳定的固体电解质界面(SEI)膜,在钠电镀的枝晶生长,是一个主要的和最显着的问题。在此,通过简单的方法在钠上原位合成富含苯二硫醇钠(PhS 2Na 2)的保护层,有效防止碳酸盐电解液中的枝晶生长,从而在1 mA cm−2的电流密度下进行400个循环(800 h)的重复电镀/剥离,实现稳定的钠金属电沉积。   有机盐PhS_2Na_2被认为是保护层中的关键组分。这一发现开辟了一个新的和有前途的途径,基于有机钠板条,以稳定钠金属与保护层。
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.