Metal-organic framework derived yolk-shell NiS2/carbon spheres for lithium-sulfur batteries with enhanced polysulfide redox kinetics

Yaxi Tian; Huawen Huang; Guoxue Liu; Ran Bi; Lei Zhang

doi:10.1039/c9cc00486f

Metal-organic framework derived yolk-shell NiS₂/carbon spheres for lithium-sulfur batteries with enhanced polysulfide redox kinetics

Chem Commun (Camb). 2019 Mar 18;55(22):3243-3246. doi: 10.1039/c9cc00486f. Epub 2019 Feb 27.

Authors

Yaxi Tian¹, Huawen Huang¹, Guoxue Liu¹, Ran Bi¹, Lei Zhang¹

Affiliation

¹ School of Chemistry & Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China. celeizhang@scut.edu.cn.

PMID: 30810149
DOI: 10.1039/c9cc00486f

Abstract

Yolk-shell NiS₂/carbon spheres (yolk-shell NiS₂/C) have been synthesized by one-step annealing of yolk-shell Ni-metal-organic framework spheres. In particular, both the inner yolk sphere and the outer shell of yolk-shell NiS₂/C can provide catalytically active sites for the redox of polysulfide confined in the yolk-shell structure, providing enhanced redox kinetics. A yolk-shell NiS₂/C-sulfur cathode exhibits a high rate capacity of 569 mA h g^-1 at 2C and shows excellent cycling stability, demonstrating the superiority of the yolk-shell structure.