Tuning Pseudocapacitance via C-S Bonding in WS2 Nanorods Anchored on N,S Codoped Graphene for High-Power Lithium Batteries

Yun Song; Shuo Bai; Lin Zhu; Mingyu Zhao; Dawei Han; Suhua Jiang; Yong-Ning Zhou

doi:10.1021/acsami.8b02506

Tuning Pseudocapacitance via C-S Bonding in WS₂ Nanorods Anchored on N,S Codoped Graphene for High-Power Lithium Batteries

ACS Appl Mater Interfaces. 2018 Apr 25;10(16):13606-13613. doi: 10.1021/acsami.8b02506. Epub 2018 Apr 11.

Authors

Yun Song¹, Shuo Bai¹, Lin Zhu¹, Mingyu Zhao¹, Dawei Han¹, Suhua Jiang¹, Yong-Ning Zhou¹

Affiliation

¹ Department of Materials Science , Fudan University , Shanghai 200433 , P. R. China.

PMID: 29582988
DOI: 10.1021/acsami.8b02506

Abstract

Pseudocapacitance plays an important role in high-power lithium-ion batteries (LIBs). However, it is still lack of effective methods to tailor the pseudocapacitance contribution in electrode materials for LIBs. Herein, pseudocapacitance tuned by the strength of C-S bonding has been rendered in WS₂ nanorods anchored on the N,S codoped three-dimensional graphene hybrid (WS₂@N,S-3DG) for the first time. The pseudocapacitive contributions in the charge storage can be enhanced effectively with the increased strength of C-S bonding. As expected, the enhanced extrinsic pseudocapacitance makes WS₂@N,S-3DG a fascinating electrode material for high-power LIBs, with a high reversible capacity of 509 mA h g^-1 over 500 cycles at a current density as high as 2 A g^-1. These encouraging results of pseudocapacitance tailored by chemical bonding provide new opportunities for designing advanced electrode materials.

Keywords: C−S bonding; WS2; graphene; lithium-ion batteries; pseudocapacitance.