China Petroleum Processing & Petrochemical Technology ›› 2021, Vol. 23 ›› Issue (4): 1-6.

• Scientific Research • Previous Articles     Next Articles

Carbon Encapsulated Nickel Nanocomposites for the Cathode in Advanced Lithium Sulfur Batteries

Yang Yuxiang; Xie Jingxin; Wu Genghuang; Zhu Na; Li Huan; Rong Junfeng   

  1. SINOPEC Research Institute of Petroleum Processing
  • Received:2021-05-26 Revised:2021-06-23 Online:2021-12-30 Published:2021-12-30
  • Contact: feng junRong
  • About author:SINOPEC Research Institute of Petroleum Processing, Beijing 100083

Abstract: Lithium sulfur (Li-S) batteries are poised to be the next generation of high-density energy storage devices. In recent years, the concept of “electrocatalysis” has been introduced into the field of Li-S batteries, and some transition metals have been proved to catalyze the electrochemical conversion reaction of sulfur species. In this study, carbon encapsulated nickel nanoparticles (Ni@C) with a specific surface area of 146 m2/g are shown to play a definitive electrocatalytic role for the sulfur cathode. With Ni@C incorporated, the Ni@C/G-S electrode achieved a better electrochemical performance than the G-S electrode. Moreover, the reversible capacity and cycle stability were further improved through chemical modifications of the carbon shell. The influence of doping with different elements on the Li-S battery performance was also investigated in detail. Higher specific capacities of 1229 mAh/g, 927 mAh/g, and 830 mAh/g were achieved at 0.2 C, 0.5 C, and 1.0 C for the N-Ni@C-G/S electrode. Besides, the B-Ni@C-G/S electrode possessed a best cycle stability.

Key words: lithium sulfur batteries, electrocatalysis, electrochemical conversion reaction, Ni@C, chemical modifications