锂硫电池正极硫炭复合材料的制备及性能研究

Preparation and properties of sulfur-carbon composites for lithium-sulfur batteries

研究了硫炭复合材料的最佳制备工艺,通过正交实验设计,最终优化出最佳制备工艺为硫炭质量比6∶4,加热温度150℃,加热时间为5 h,升华温度300℃,升华温度恒温时间2 h;在该条件下制备的材料首次放电比容量1 205.2m Ah/g,20周循环后放电比容量为1 101.9 m Ah/g,容量保持率为91.4%,材料的循环性能较佳。

The optimum preparation process of the sulfur carbon composite material was studied.Through orthogonal experiment design,the optimum preparation process is that the ratio of sulfur and carbon is 6:4 under the heating temperature of 150℃for 5 h,with the constant sublimation temperature of 300℃for 2 h.The initial specific discharge capacity of the prepared material under these conditions is 1 205.2 mAh/g,the discharge specific capacity is 1 101.9 mAh/g after 20 cycles,and the capacity retention rate is 91.4%with better cycle performance.