羧基化碳纳米管含量对锂硫电池SPAN正极材料循环性能的影响  

Effect of content of carboxylated carbon nanotubes on cycling performance of lithium-sulfur battery SPAN cathode materials

作　　者：张兴祥[1] 穆钟林 刘浩 刘海辉[1] ZHANG Xingxiang;MU Zhonglin;LIU Hao;LIU Haihui(School of Material Science and Engineering,Tiangong University,Tianjin 300387,China)

机构地区：[1]天津工业大学材料科学与工程学院,天津300387

出　　处：《天津工业大学学报》2025年第1期32-39,共8页Journal of Tiangong University

基　　金：天津市科技军民融合重大专项项目(18ZXJMTG00110)。

摘　　要：针对锂硫电池(LSB)中存在的硫利用率低、循环稳定性差的问题,采用简单的静电纺丝技术,并结合半碳化、硫化方法制备了一种独立的硫化聚丙烯腈/羧基化多壁碳纳米管(SPAN/MWCNTs-COOH)复合材料。将该材料直接用作锂硫电池的正极材料,并探究了不同的MWCNTs-COOH添加量对电池循环性能的影响。结果表明:由于其独特的纳米纤维三维网络结构,促进了电池中离子的快速转移,提高了电池的电导率,所制备的正极材料具有库伦效率高、循环稳定性好、柔韧性好等特点。添加9%(质量分数)MWCNTs-COOH的正极材料在0.2 C循环200圈后的容量为533.97 mA·h/g,在0.5 C循环500圈后容量达到429.21 mA·h/g,在较高的电流密度1 C下,仍表现出较好的循环稳定性。Addressing the issues of low sulfur utilization and poor cycle stability in lithium-sulfur batteries(LSBs),an independent sulfurized polyacrylonitrile/carboxylated multi-walled carbon nanotubes(SPAN/MWCNTs-COOH)a composite material of an independent sulfu is prepared using a simple electrospinning technique combined with semi-carbonization and sulfidation methods,which can be directly used as the cathode material for lithium-sulfur batteries.The impact of different additions of MWCNTs-COOH on the battery′s cycle performance is investigated.The results show that due to its unique three-dimensional nanofiber network structure,the composite material promotes the rapid transfer of ions in the battery and enhances the battery′s electrical conductivity.The prepared cathode material features high Coulombic efficiency,good cycle stability,and flexibility.The cathode material with 9%(mass fraction)MWCNTs-COOH exhibits a capacity of 533.97 mA·h/g after 200 cycles at 0.2 C,and a capacity of 429.21 mA·h/g after 500 cycles at 0.5 C.Even at a higher current density of 1 C,the composite material still demonstrates good cycle stability.

关 键 词：锂硫电池 硫化聚丙烯腈 正极材料 自支撑 羧基化碳纳米管 循环性能 

分 类 号：TM911.24[电气工程—电力电子与电力传动] TQ152[化学工程—电化学工业]