不同氨基含量碳纳米管对锂硫电池正极比容量的影响  

Effects of Amino Content of Aminated Carbon Nanotubes on Specific Capacity of Cathode for Li-sulfur Battery

作　　者：薛转 穆钟林 何润合 李永兵 张兴祥[1,2,3] XUE Zhuan;MU Zhonglin;HE Runhe;LI Yongbing;ZHANG Xingxiang(School of Material Science and Engineering,Tiangong University,Tianjin 300387,China;Tianjin Municipal Key Laboratory of Advanced Fiber and Energy Storage Technology,Tianjin 300387,China;National&Local Joint Engineering Research Center of Advanced Fiber and Textile Composite Technology,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 [2]天津市先进纤维与储能技术重点实验室,天津300387 [3]高技术纤维及先进纺织复合材料技术国家地方联合工程中心,天津300387

出　　处：《高等学校化学学报》2023年第4期91-99,共9页Chemical Journal of Chinese Universities

基　　金：天津市新材料重大专项项目(批准号:16ZXCLGX00090);国家重点研发计划项目(批准号:2016YFB0303000)资助。

摘　　要：为了提高锂硫电池的电化学性能,采用氨基化碳纳米管(MWCNTs-NH2)改性正极材料,通过狄尔斯-阿尔德(D-A)反应制备了氨基化碳纳米管,然后改变反应时间获得一系列样品;利用热重分析仪、拉曼光谱仪和红外光谱仪对样品进行表征.结果表明,MWCNTs-NH2中氨基含量随D-A反应时间的延长而增高,当反应时间为16 h时,其接枝率最大,达到10.02 mmol/g;对4种由不同氨基含量MWCNTs-NH2制备的复合材料所组装的电池进行了电化学性能分析,结果表明,电池的电化学性能随着氨基含量的增高而增强.在0.2C和1C倍率下,氨基含量最高的电极材料(SPAN/MWCNTs-NH2-16)的首次放电比容量分别达到943.3和887.1mA·h/gcomposite,在0.2C倍率下循环200次后放电容量仍达到716.4 mA·h/gcomposite,容量保持率可达到94.3%;在高倍率4.0C下,放电比容量可达475.7 mA·h/gcomposite,具有优异的循环性能和倍率性能.In order to improve the electrochemical performance of lithium sulfur batteries,aminated carbon nanotubes(MWCNT-NH2)were used to improve the properties of cathode.MWCNT-NH2 was fabricated by Diels-Alder(D-A)reaction.A series of specimen were obtained by changing the reaction time.The samples were analyzed and characterized using thermogravimetric analyzer,Raman spectrometer and infrared spectrometer.The results show that,the amino content of MWCNT-NH2 rises with the increase of D-A reaction period,and the grafting rate reaches 10.02 mmol/g at 16 h.The electrochemical performance of four cells assembled from MWCNT-NH2 composites with different amino content was analyzed.The results show that,the higher the amino content,the better the electrochemical performance.The initial discharge specific capacities of the cathode material with the highest amino content(SPAN/MWCNTs-NH2-16)at 0.2C and 1.0C are 943.3 and 887.1 mA·h/gcomposite.After 200 cycles at 0.2C,the reversible specific capacity is 716.4 mA·h/gcomposite,and the capacity retention rate can be increased to 94.3%.The initial discharge specific capacities of SPAN/MWCNTs-NH2-16 at high current density 4.0C are 475.7 mA·h/gcomposite,It has excellent cycle performance and rate performance,and demonstrating its great potential for future application of energy storage.

关 键 词：锂硫电池 正极材料 氨基化碳纳米管 狄尔斯-阿尔德反应 

分 类 号：O646[理学—物理化学]