Song Pengfei, Han Lu, Zhu Liuyan, Zhang Rui, Chai Yingjie, Lei Zijie, Wang Lijiang, Shen Sibo
College of Chemical Engineering, Hebei Normal University of Science and Technology, 066004, Qinhuangdao, Hebei, China.
College of Horticultural Science &Technology, Hebei Normal University of Science and Technology, Qinhuangdao, Hebei, 066004, China.
Chem Asian J. 2023 Nov 16;18(22):e202300604. doi: 10.1002/asia.202300604. Epub 2023 Oct 11.
The shuttle effect of lithium-sulfur (Li-S) batteries and the poor conductivity of sulfur (S) and lithium polysulfide severely limit their practical applications. Currently, compounding carbon materials with S is one of the effective ways to solve this problem. Therefore, green, low-cost chestnut inner shell biochar (CISC) with graded porous structure was used as the S carrier in this experiment, and carbon nanotubes (CNTs) coating was employed as the S protective layer to improve the electrical conductivity and inhibit the shuttle effect. The results showed that the CISC prepared in this experiment had a relatively high specific surface area (1135.11 m g ), and the S loading rate was as high as 65.72 %. The graded porous structure and high specific surface area of CISC can increase the loading rate of S and thus increase the battery capacity. Meanwhile, the naturally contained O and N elements can improve the chemisorption of S. The initial discharge capacity of the CISC@S/CNTs battery at 0.1 C is 967.3 mAh g , and the capacity retention rate is 74.3 % after 500 cycles. The unique composite structure improves the battery's electrical conductivity, reduces the dissolution of polysulfides, and enhances the battery cycle stability.
