Metallic 1T phase MoS2 nanosheets decorated hollow cobalt sulfide polyhedra for high-performance lithium storage

Abstract

Transition metal sulfides have attracted tremendous attention as promising lithium-ion anodes due to their natural abundance, intrinsic safety and high theoretical capacity. However, low conductivity and dramatic volume variation hinder their further application in lithium storage. Here, we reported a facile metal–organic framework (MOF)-derived self-template approach to prepare hollow cobalt sulfide polyhedra with vertically aligned metallic phase MoS₂ nanosheets (denoted as CoS@1T-MoS₂) as efficient anode materials for lithium storage. Benefiting from the high intrinsic conductivity of metallic phase MoS₂, the hierarchical hollow framework, and the synergistic effect of interior cobalt sulfide and exterior metallic MoS₂, the CoS@1T-MoS₂ composite delivers a high reversible capacity of 1269 mA h g⁻¹ after 100 cycles at a current density of 100 mA g⁻¹ and 936 mA h g⁻¹ at a current density of 1000 mA g⁻¹ after 220 cycles.