锂硫电池的正极材料研究是实际应用的关键,其中硫化碳正极材料由于其高容量保持率、超低自放电率和高安全性受到广泛关注。但该材料的突出问题是硫含量过低。利用硫化促进剂四甲基二硫代秋兰姆(TMTD)提升硫化聚丙烯腈(PAN-S)正极材料中硫含量至34.09%。所构成的锂硫电池不仅保持本身库仑效率高的特点,且放电比容量高出对照组硫化碳电极280mAh/g左右,循环稳定性增加,为硫化促进剂提高硫化聚丙烯腈材料硫含量的方法提供了有力的佐证。
The exploring of cathode materials is the key of practical lithium-sulfur(Li-S) batteries,of which the Sulfurized carbon have become a widely concerned cathode material for its high capacity retention,extremely low self-discharge,and excellent safety.However,the relatively low sulfur content hinders the practical applications.In this passage,Tetramethyl thiuram disulfide(TMTD)was used to improve the sulfur content during carbon sulfurization,and the sulfur content increased 5.5wt%.The corresponding Li-S batteries behaved well:not only keeping the outstanding coulombic efficiency,but also increasing the discharge capacity by 280 mAh/g,and cycling stability getting better.This research supplied a good example for improving the sulfur content by vulcanization accelerator.
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