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

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 center dot h/g(composite). After 200 cycles at 0.2C,the reversible specific capacity is 716.4 mA center dot h/g(composite),and the capacity retention rate can be increased to

Automated summary

To improve the electrochemical performance of lithium sulfur batteries, aminated carbon nanotubes (MWCNT-NH2) were used to enhance the cathode properties. MWCNT-NH2 was synthesized through Diels-Alder (D-A) reaction, and a series of specimens were obtained by varying the reaction time. The samples were analyzed and characterized using thermogravimetric analyzer, Raman spectrometer, and infrared spectrometer. The results demonstrated that the amino content of MWCNT-NH2 increased with the prolonged D-A reaction time, reaching a grafting rate of 10.02 mmol/g at 16 hours. Electrochemical performance analysis of four cells assembled using MWCNT-NH2 composites with different amino content revealed that a higher amino content led to better electrochemical performance. The cathode material with the highest amino content (SPAN/MWCNTs-NH2-16) exhibited initial discharge specific capacities of 943.3 and 887.1 mA·h/g (composite) at 0.2C and 1.0C, respectively. After 200 cycles at 0.2C, the reversible specific capacity was 716.4 mA·h/g (composite), with an increased capacity retention rate.