High-performance room-temperature sodium-sulfur battery enabled by electrocatalytic sodium polysulfides full conversion

被引：185

作者：

Wang, Nana ^{[1
,2
,3
]}

Wang, Yunxiao ^{[1
]}

Bai, Zhongchao ^{[2
,3
]}

Fang, Zhiwei ^{[2
,3
]}

Zhang, Xiao ^{[2
,3
]}

Xu, Zhongfei ^{[1
]}

Ding, Yu ^{[1
]}

Xu, Xun ^{[1
]}

Du, Yi ^{[1
]}

Dou, Shixue ^{[1
]}

Yu, Guihua ^{[2
,3
]}

机构：

[1] Univ Wollongong, Inst Superconducting & Elect Mat, Innovat Campus,Squires Way, Wollongong, NSW 2500, Australia

[2] Univ Texas Austin, Mat Sci & Engn Program, Austin, TX 78712 USA

[3] Univ Texas Austin, Dept Mech Engn, Austin, TX 78712 USA

来源：

ENERGY & ENVIRONMENTAL SCIENCE | 2020年 / 13卷 / 02期

基金：

澳大利亚研究理事会;

关键词：

CATALYTIC-ACTIVITY;

D O I：

10.1039/c9ee03251g

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：562 / 570

页数：9

共 45 条

[1]

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