Chemical anchoring of SeS2 on a fluoro-substituted covalent organic framework as a high-performance cathode material

De-Gao Wang; Yunyan Wang; Min Song; Gui-Chao Kuang; Kai Han

doi:10.1039/c9cc06382j

Chemical anchoring of SeS₂ on a fluoro-substituted covalent organic framework as a high-performance cathode material

Chem Commun (Camb). 2019 Oct 31;55(88):13247-13250. doi: 10.1039/c9cc06382j.

Authors

De-Gao Wang¹, Yunyan Wang², Min Song¹, Gui-Chao Kuang¹, Kai Han²

Affiliations

¹ State Key Laboratory of Power metallurgy, Central South University, Changsha, Hunan 410083, P. R. China. gckuang@csu.edu.cn.
² Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, P. R. China. hankai@csu.edu.cn.

PMID: 31621708
DOI: 10.1039/c9cc06382j

Abstract

In this work, a high-performance cathode material was achieved by using SeS2 post-functionalization of a fluorinated covalent organic framework (COF) through SNAr chemistry. The chemical and physical confinement of polysulfides and polyselenides combined with enhanced conductivity boosted its electrochemical performance as a cathode material for lithium-sulfur batteries (LSBs). COF-F-SeS2 delivered a discharge capacity of 1633 mA h g-1 at 0.1C, an excellent C-rate performance of 1163 mA h g-1 at 1C and favorable long cycle performance. This work provides a feasible strategy to overcome the bottlenecks of LSBs for high capacity, excellent C-rate performance and enhanced cycle performance.