Optimization of cathode material and its effect on improvement of charge/discharge performance of lithium-sulfur batteries
LIU Xiu-lan1, HU Chen2, FENG Yi1, CAI Hong-wei1, ZHANG Yu-jia1
1. State Grid Beijing Electric Power Research Institute, Beijing 100075, China; 2. Beijing Electric Power Company, State Grid Corporation of China, Beijing 100083, China
Abstract: The shuttle effect of polysulfides cause lithium-sulfur batteries (LSBs) to have a degraded charge and discharge performance, a short service life and a poor cyclic stability, hindering LSBs to be commercialization.To suppress the shuttle effect, two strategies have been developed, including restraining the movement of Sx2- and reducing the concentration of Li2Sx.However, there exists saturation phenomenon in the suppression of shuttle effect by using the former strategy.Therefore, it is favorable for further suppressing the shuttle effect by adding transition metal catalysts for accelerating the conversion of polysulfides.MnO@hollow carbon sphere (MnO@C), an improved composite for suppressing the shuttle effect, is designed and prepared through optimizing carbon composites.It can suppress the shuttle effect through the synergy between physical and chemical effects.It is proved by the results that the optimized composite can effectively help LSBs to improve the charge/discharge performance, the cycle property and the rate capability.The initial discharge specific capacity of the LSBs reaches 1, 009 mAh·g-1 at 0.5 C.After 200 cycles, the specific capacity of the LSBs is 853 mAh·g-1, indicating that the capacity retention ratio achieves 84.5%.
刘秀兰, 扈晨, 冯义, 蔡宏伟, 张玉佳. 正极材料的优化及其改善锂硫电池充放电性能的研究[J]. 现代化工, 2021, 41(10): 196-199.
LIU Xiu-lan, HU Chen, FENG Yi, CAI Hong-wei, ZHANG Yu-jia. Optimization of cathode material and its effect on improvement of charge/discharge performance of lithium-sulfur batteries. Modern Chemical Industry, 2021, 41(10): 196-199.
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