Co-HCS/S composite lithium-sulfur battery positive electrode material and preparation method thereof

• Main Authors: YANG MINGZHI, LIU WEILIANG, XIAO TINGJIAO, GE HONGHAN, REN MANMAN
• Format: Patent
• Language: Chinese; English
• Published: 11.05.2021
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention relates to a Co-HCS/S composite lithium-sulfur battery positive electrode material and a preparation method thereof. The positive electrode material is prepared by doping cobalt into hollow carbon nanospheres (HCS) and then loading sulfur. The preparation method comprises the following steps: (1), preparing a cobalt-doped precursor; (2), calcining the precursor in an inert gas to obtain SiO2@Co-HCS; (3), removing SiO2 from sodium hydroxide to obtain Co-HCS; and (4), mixing and calcining with sulfur powder under inert gas to obtain the Co-HCS/S composite lithium-sulfur battery positive electrode material. The hollow carbon nanospheres are doped with Co, on one hand, the hollow carbon nanospheres provide a conductive network to enhance the conductivity of the sulfur positive electrode, and on the other hand, Co can be used as a catalyst to effectively enhance the conductivity of the lithium-sulfur battery positive electrode, accelerate electron transport and accelerate oxidation-reduction reaction