Electrocatalyzing S Cathodes via Multisulfiphilic Sites for Superior Room-Temperature Sodium-Sulfur Batteries

Authors

Hanwen Liu, University of WollongongFollow
Wei Pei
Weihong Lai, University of WollongongFollow
Zichao YanFollow
Huiling Yang, University of WollongongFollow
Yaojie Lei, University of WollongongFollow
Yunxiao Wang, University of WollongongFollow
Qinfen Gu
Si Zhou, University of WollongongFollow
Shulei Chou, University of WollongongFollow
Hua-Kun Liu, University of WollongongFollow
Shi Xue Dou, University of WollongongFollow

RIS ID

144142

Publication Details

Liu, H., Pei, W., Lai, W., Yan, Z., Yang, H., Lei, Y., Wang, Y., Gu, Q., Zhou, S., Chou, S., Liu, H. & Dou, S. Xue. (2020). Electrocatalyzing S Cathodes via Multisulfiphilic Sites for Superior Room-Temperature Sodium-Sulfur Batteries. ACS nano, 14 (6), 7259-7268.

Abstract

Room-temperature sodium-sulfur (RT-Na/S) batteries hold great promise for sustainable and cost-effective applications. Nevertheless, it remains a great challenge to achieve high capacity and cycling stability due to the low activity of sulfur and the sluggish conversion kinetics between polysulfide intermediates and sodium sulfide. Herein, an electrocatalyzing S cathode is fabricated, which consists of porous core-shell structure and multisulfiphilic sites. The flexible carbon structure effectively buffers volume changes during cycling and provides enclosed spaces to store S8 with exceptional conductivity. Significantly, the multisulfiphilic sites (ZnS and CoS2) enhance catalysis toward multistep S conversion, which effectively suppresses long-chain polysulfides dissolution and improves the kinetics of short-chain polysulfides. Thus, the obtained S cathodes achieve an enhanced cycling performance (570 mAh g-1 at 0.2 A g-1 over 1000 cycles), decent rate capability (250 mAh g-1 at 1.0 A g-1 over 2000 cycles), and high energy density of 384 Wh kg-1 toward practical applications.