Application of Layered Co3O4 /C Derived from Metal-organic Framework in Lithium-sulfur Batteries
ZHAO Wenwen, WANG Yunfang, DUAN Donghong, LIU Shibin, ZHOU Xianxian, CHEN Liang
Institute of Clean Technique for Chemical Engineering, College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Abstract: Cobalt tetroxide/carbon composite nanoparticles were synthesized by a method of oxidizing layer-shaped MOF-71 precursor primary carbonization. By virtue of the polar advantage of cobalt tetroxide, the prepared nanoparticles can have a strong affinity for lithium polysulfide and inhibit the shuttle effect. Through physical characterization and electrochemical test of the material, it is found that the oxidation temperature has a greater impact on the shape of the Co3O4/C structure and the particle size of the Co3O4/C material prepared by high temperature oxidation is about 50 nm, the average pore size of which is 17.44 nm. Multi-layered reticular structure is conducive to improving battery capacity and stability. Discharge specific capacity of lithium sulfur batteries assembled with Co3O4/C as positive matrix loaded with sulfur is 1 142.2 mAh·g-1 in the first cycle at a discharge rate of 0.2C. After cycled 300 times at the current density of 0.5C, the Coulombic efficiency remains above 98%, lithium sulfur batteries exhibiting excellent electrochemical performance.
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