Abstract
Several critical issues, such as the shuttling effect and the sluggish reaction kinetics, exist in the design of high-performance lithium-sulfur (Li-S) batteries. To address these issues, Co9S8-Mo2C nanoparticles were synthesized by carburizing method with Co-Co PBA as the precursor, which was used to modify cathode materials in Li-S batteries. Strong sulfur fixation and catalytic effects on liquid-phase and liquid-solid transformation were demonstrated by Co9S8-Mo2C nanoparticles. In contrast, the positive electrode of Co9S8 nanoparticles is inferior to that of Co9S8-Mo2C nanoparticles in every way. This proves that the adsorption-catalytic function of Co9S8-Mo2C enhances polysulfide capture and conversion efficiency. By optimizing the proportion of Mo2C, we obtained a material with the best performance. The positive electrode that had the optimal ratio of Co9S8-Mo2C nanoparticles showed high specific capacity (0.2 C, 1010.8 mAh·g-1), excellent rate performance (1 C, 609.4 mAh·g-1 and 2 C, 590 mAh·g-1) and stable cycle performance.
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