In-situ confining CoS2 catalyst in mesopores of ZIF-8(C)@CMK-3 for lithium-sulfur batteries

Lithium-sulfur battery (Li-S) has attracted more and more attention due to its excellent theoretical specific capacity and high theoretical capacity density. However, the dissolution of polysulfide and the occurrence of shuttle effect seriously hinder the practical application of lithium-sulfur batteries. Herein, a novel electrocatalytic sulfur carrier CoS2@ZIF-8(C)@CMK-3 (CoS2@ZCC), composed by CoS2 confined in the core-shell and hollow mesopores carbon derived from ZCC, was successfully fabricated for the first time. The synergistic interaction between CoS2 and ZCC significantly restrained the shuttle effects and promoted the reaction kinetics. Additionally, the confining effect of CoS2 inside the tube of ZCC strongly improves the interfacial contact, enhances the chemisorptivity for polysulfide conversion, thus demonstrating high rate capacity and cyclic stability.

Automated summary

The electrocatalytic sulfur carrier CoS2@ZIF-8(C)@CMK-3 (CoS2@ZCC) was fabricated for the first time, which effectively suppressed the dissolution of polysulfide and shuttle effect, promoting reaction kinetics. The confinement of CoS2 inside ZCC improved interfacial contact and chemisorptivity, leading to high-rate capacity and cyclic stability.