Abstract
Lithium-sulfur batteries have high theoretical specific capacity benefitting from their own multiple electrons participating in redox reactions, which has attracted wide attention. Whereas, the poor conductivity, shuttle effect and volume expansion hinder the commercial application of lithium-sulfur batteries. Herein, a novel N/S-codoped 3D hollow carbon spheres embedded CoS2 nanoreactors are elaborated, which have competition advantages. Due to the synergistic chemisorption of doped heteroatom sites and polar CoS2 nanoparticles, the nanoreactors have strong adsorption capacity to lithium polysulfides (LiPSs). The 3D hollow graphitized carbon spheres with highly electrical conductivity facilitates fast sulfur electrochemistry redox reaction. The competition advantages effectively improve the performance of the lithium sulfur batteries. Accordingly, the S@CoS2NHGC cathode exhibits excellent specific capacity. It shows excellent electrochemical properties, such as 1570 mAh g−1 at 0.05 C, high cycle stability and Coulombic efficiency at 5 C, and outstanding rate performance at 10 C. We provide a reasonably designed strategy and fully explore the mechanism of improving the performance of Li-sulfur battery.
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