Preparation of CoO/SnO₂@NC/S composite as high-stability cathode material for lithium-sulfur batteries

Abstract

To improve the sulfur loading capacity of lithium-sulfur batteries (Li-S batteries) cathode and avoid the inevitable “shuttle effect”, hollow N doped carbon coated CoO/SnO₂ (CoO/SnO₂@NC) composite has been designed and prepared by a hydrothermal-calcination method. The specific surface area of CoO/SnO₂@NC composite is 85.464 m²·g⁻¹, and the pore volume is 0.1189 cm³·g⁻¹. The hollow core-shell structure as a carrier has a sulfur loading amount of 66.10%. The initial specific capacity of the assembled Li-S batteries is 395.7 mAh·g⁻¹ at 0.2 C, which maintains 302.7 mAh·g⁻¹ after 400 cycles. When the rate increases to 2.5 C, the specific capacity still has 221.2 mAh·g⁻¹. The excellent lithium storage performance is attributed to the core-shell structure with high specific surface area and porosity. This structure effectively increases the sulfur loading, enhances the chemical adsorption of lithium polysulfides, and reduces direct contact between CoO/SnO₂ and the electrolyte.

Keywords

hydrothermal-calcination method / CoO/SnO₂@NC composite / lithium-sulfur battery / cycling stability

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