摘要
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/SnO_(2)(CoO/SnO_(2)@NC)composite has been designed and prepared by a hydrothermal-calcination method.The specific surface area of CoO/SnO_(2)@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/SnO_(2) and the electrolyte.
基金
financially supported by the National Natural Science Foundation of China(52072330)
Natural Science Foundation of Jiangsu Province(BK20181469)
Science and Technology Planning Social Development Project of Zhenjiang City(SSH20190140049).
