China Petroleum Processing & Petrochemical Technology ›› 2021, Vol. 23 ›› Issue (4): 1-6.
• Scientific Research •
Yang Yuxiang; Xie Jingxin; Wu Genghuang; Zhu Na; Li Huan; Rong Junfeng
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.
lithium sulfur batteries,
electrochemical conversion reaction,
Yang Yuxiang, Xie Jingxin, Wu Genghuang, Zhu Na, Li Huan, Rong Junfeng. Carbon Encapsulated Nickel Nanocomposites for the Cathode in Advanced Lithium Sulfur Batteries[J]. China Petroleum Processing & Petrochemical Technology, 2021, 23(4): 1-6.
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