功能性碳纳米管碳膜对锂硫电池性能影响的研究

Effects of Functional Carbon Interlayer on Performance for Lithium- sulfur Batteries

锂硫电池由于其较高的理论能量密度近年来受到广泛关注。将海藻酸钠、聚乙烯醇、高比表面超导碳、碳纳米管制备成分散液,通过真空抽滤的方法制备了碳纳米管碳膜。将制备的碳膜置于锂硫电池正极与隔膜之间,以改善锂硫电池的性能。利用SEM,电化学性能测试等方法,表征了碳膜的微观形貌并测试了锂硫电池的电化学性能。引入碳膜的锂硫电池首次放电容量达到1537.6 m Ah/g,80次循环后容量保持在1189 m Ah/g。碳纳米管碳膜能够提供电子的传输通道,吸附聚硫离子,抑制固相产物在正极表面的富集,使锂硫电池的性能有较大幅度的提高。

In recent years , lithium-sulfur batteries attract widespread attention because of its high theoretical energy density.Sodium alginate , polyvinyl alcohol , superconducting high surface area carbon were used to prepare a solution of carbon nanotubes , and then prepared by carbon filtration method putting the prepared carbon interlayer between the positive electrode and lithium-sulfur battery separator.Test methods such as SEM and electrochemical performance test were use to characterize the microstructure of the material and test its electrochemical properties.It was found that the capacity of the lithium-sulfur battery which inserted the carbon interlayer had been greatly improved , the initial discharge capacity reached to 1537.6 mAh/g, after 80 cycles the capacity held 1189 mAh/g.Carbon nanotubes interlayer can provide electronic transmission channels , polysulfide ion adsorption , inhibition of solid-phase product enriched in the surface of the anode , the lithium-sulfur battery performance has dramatically increased.