中国炼油与石油化工 ›› 2021, Vol. 23 ›› Issue (4): 1-6.

• Scientific Research • 上一篇    下一篇

碳包覆镍纳米复合材料在锂硫电池正极中的应用

杨宇翔,谢婧新,吴耿煌,朱娜,李欢,荣峻峰   

  1. 中国石化石油化工科学研究院

  • 收稿日期:2021-05-26 修回日期:2021-06-23 出版日期:2021-12-30 发布日期:2021-12-30
  • 通讯作者: 荣峻峰 E-mail:rongjf.ripp@sinopec.com

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 E-mail:rongjf.ripp@sinopec.com
  • About author:SINOPEC Research Institute of Petroleum Processing, Beijing 100083

摘要: 锂硫电池有望成为下一代高能量密度储能设备。近年来,“电催化”的概念被引入锂硫电池领域中,一些过渡金属被证明可以催化含硫物质的电化学转化反应。本工作中,比表面积为146 m2/g的碳包覆镍纳米材料对于硫正极的电化学反应具有电催化作用。加入碳包覆镍材料后,Ni@C/G-S电池获得了比G-S电池更好的电化学性能。在此基础上,通过对碳包覆镍的碳壳表面进行化学改性,进一步提高了锂硫电池的可逆比容量和循环稳定性。此外,本文详细研究了碳壳不同元素掺杂对锂硫电池性能的影响。N-Ni@C-G/S电池在0.2 C、0.5 C和1.0 C倍率下实现了更高的比容量,分别为1229 mAh/g、927 mAh/g和830 mAh/g;而B-Ni@C-G/S电池具有最好的循环稳定性。

关键词: 锂硫电池, 电催化作用, 电化学转化反应, 碳包覆镍材料, 化学修饰

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