Dendrite-Free Sodium Metal Anodes Enabled by a Sodium Benzenedithiolate-Rich Protection Layer.,Angewandte Chemie International Edition

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Dendrite-Free Sodium Metal Anodes Enabled by a Sodium Benzenedithiolate-Rich Protection Layer.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-01-27 , DOI: 10.1002/anie.201916716
Ming Zhu _{1,

2} , Guanyao Wang ₁ , Xing Liu ₁ , Bingkun Guo ₃ , Gang Xu ₁ , Zhongyi Huang ₁ , Minghong Wu ₁ , Hua-Kun Liu ₂ , Shi-Xue Dou ₂ , Chao Wu _{1,

2}

Affiliation

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 (PhS2 Na2 )-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, PhS2 Na2 , 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.

中文翻译：

富含苯二甲硫醇钠保护层的无树突状钠金属阳极。

金属钠由于其理论容量高（1166 mAh g-1），成本低且富含地球，因此是金属可充电电池的理想负极材料。但是，由于不稳定的固体电解质中间相（SEI）膜而导致的在Na镀层上的树枝状生长是一个主要且最显着的问题。在这里，通过一种有效防止碳酸盐电解质中枝晶生长的方法，在钠上就地合成了富含苯二硫酸钠（PhS2 Na2）的保护层，从而在重复电镀/电镀的400个循环（800 h）中实现了稳定的钠金属电沉积/以1 mA cm-2的电流密度进行剥离。发现有机盐PhS2 Na2是保护层中的关键成分。这一发现为有机钠盐板条开辟了一条新的前景广阔的途径，

更新日期：2020-02-19

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