High-performance room-temperature sodium–sulfur battery enabled by electrocatalytic sodium polysulfides full conversion,Energy & Environmental Science

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High-performance room-temperature sodium–sulfur battery enabled by electrocatalytic sodium polysulfides full conversion
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2019/12/20 , DOI: 10.1039/c9ee03251g
Nana Wang _{1,

2,

3,

4,

5} , Yunxiao Wang _{1,

2,

3,

4,

5} , Zhongchao Bai _{6,

7,

8,

9} , Zhiwei Fang _{6,

7,

8,

9} , Xiao Zhang _{6,

7,

8,

9} , Zhongfei Xu _{1,

2,

3,

4,

5} , Yu Ding _{1,

2,

3,

4,

5} , Xun Xu _{1,

2,

3,

4,

5} , Yi Du _{1,

2,

3,

4,

5} , Shixue Dou _{1,

2,

3,

4,

5} , Guihua Yu _{6,

7,

8,

9}

Affiliation

Room-temperature sodium–sulfur (RT-Na–S) batteries are highly desirable for grid-scale stationary energy storage due to their low cost; however, short cycling stability caused by the incomplete conversion of sodium polysulfides is a major issue for their application. Herein, we introduce an effective sulfiphilic host, gold nanodots decorated on hierarchical N-doped carbon microspheres (CN/Au/S), to achieve completely reversible conversion reactions in the S cathode by electrocatalyzing the low-kinetics conversion of Na₂S₄ into NaS₂ (discharge process) or S (charge process). Besides, gold nanodots and N-doped carbon can increase the conductivity of the S cathode and provide strong polar–polar adsorption of sodium polysulfides to alleviate the shuttling effects. When serving as the cathode, the CN/Au/S composite can realize enhanced sulfur utilization, excellent cycling stability, and outstanding rate capability. This work deepens our understanding of the catalytic effect of gold atoms on sulfur molecules, opening a new avenue for cathode design and development of advanced RT-Na–S batteries.

中文翻译：

电催化多硫化钠完全转化可实现高性能室温钠硫电池

室温钠-硫（RT-Na-S）电池由于价格低廉，非常适合电网规模的固定式储能。然而，由多硫化钠的不完全转化引起的短循环稳定性是其应用中的主要问题。在此，我们引入一个有效sulfiphilic主机，金纳米点装饰分层掺杂的N-碳微球（CN /金/ S），通过electrocatalyzing Na组成的低动力学转换实现在S阴极完全可逆的转化反应₂小号₄成硫酸钠₂（放电过程）或S（充电过程）。此外，金纳米点和N掺杂碳可以增加S阴极的电导率，并提供对多硫化钠的强极性吸附，以减轻穿梭效应。当用作阴极时，CN / Au / S复合材料可实现更高的硫利用率，出色的循环稳定性和出色的倍率性能。这项工作加深了我们对金原子对硫分子催化作用的理解，为高级RT-Na-S电池的阴极设计和开发开辟了一条新途径。

更新日期：2020-02-19

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