Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (4): 20220709.doi: 10.7503/cjcu20220709

• Physical Chemistry • Previous Articles     Next Articles

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

XUE Zhuan1, MU Zhonglin1, HE Runhe1, LI Yongbing1, ZHANG Xingxiang1,2,3()   

  1. 1.School of Material Science and Engineering,Tiangong University
    2.Tianjin Municipal Key Laboratory of Advanced Fiber and Energy Storage Technology
    3.National & Local Joint Engineering Research Center of Advanced Fiber and Textile Composite Technology,Tianjin 300387,China
  • Received:2022-11-08 Online:2023-04-10 Published:2023-01-08
  • Contact: ZHANG Xingxiang E-mail:zhangpolyu@aliyun.com
  • Supported by:
    the New Materials Research Key Program of Tianjin, China(16ZXCLGX00090);the National Key Research and Development Program of China(2016YFB0303000)

Abstract:

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.

Key words: Lithium sulfur battery, Cathode material, MWCNTs-NH2, Diels-Alder reaction

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