高等学校化学学报 ›› 2019, Vol. 40 ›› Issue (9): 1972-1978.doi: 10.7503/cjcu20190083

• 物理化学 • 上一篇    下一篇

V2O3空心球的制备及在锂硫电池中的应用

李新,陈良(),马晓涛,张鼎,徐守冬,周娴娴,段东红,刘世斌()   

  1. 太原理工大学化学化工学院, 太原 030024
  • 收稿日期:2019-01-29 出版日期:2019-09-10 发布日期:2019-09-09
  • 通讯作者: 陈良,刘世斌 E-mail:chenliang@tyut.edu.cn;sbliu@tyut.edu.cn
  • 基金资助:
    国家自然科学基金(21706171, 21506141, 21606158);山西省重点研发计划项目.(201803D121120)

Preparation of V2O3 Hollow Spheres for Lithium Sulfur Batteries

LI Xin,CHEN Liang(),MA Xiaotao,ZHANG Ding,XU Shoudong,ZHOU Xianxian,DUAN Donghong,LIU Shibin()   

  1. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
  • Received:2019-01-29 Online:2019-09-10 Published:2019-09-09
  • Contact: CHEN Liang,LIU Shibin E-mail:chenliang@tyut.edu.cn;sbliu@tyut.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(21706171, 21506141, 21606158);? the Key Research and Development Program of Shanxi Province, China(No.201803D121120).(201803D121120)

摘要:

在NH3辅助下将制备的V2O5空心球高温还原为V2O3空心球, 并利用透射电子显微镜、 扫描电子显微镜、 X射线衍射和X射线光电子能谱等手段对材料的形貌与结构进行表征. 将V2O3空心球与硫机械混合后, 不经过熔融复合直接作为锂硫电池的正极材料. 电化学测试结果显示, 在0.2C倍率下, 电池首次放电比容量达到1375 mA·h/g, 循环100次后放电比容量可以维持在815 mA·h/g; 在1C高倍率下, 电池首次放电比容量为710 mA·h/g, 经过500次循环后, 放电比容量仍能达到530 mA·h/g, 表明V2O3空心球的加入能够有效提高锂硫电池的循环性能.

关键词: 三氧化二钒, 正极材料, 锂硫电池

Abstract:

The prepared V2O5 hollow spheres were reduced to V2O3 hollow spheres with the assistance of NH3 at high temperature. The morphology and structure of the V2O3 hollow spheres were characterized by transmission electron microscopy(TEM), scanning electron microscopy(SEM), powder X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS). The powder of V2O3 hollow spheres and sulfur was mixed directly without further thermal treatment and the mixture was used as the cathode of lithium-sulfur batteries. The electrochemical test show that the initial capacity reaches 1375 mA·h/g and the capacity after 100 cycles is 815 mA·h/g at 0.2C; even at 1C, the initial capacity reaches 710 mA·h/g and the capacity after 500 cycles is 530 mA·h/g. The results indicate that the addition of V2O3 hollow sphere in the lithium sulfur battery can effectively improve the cycle performance.

Key words: Vanadium trioxide, Cathode material, Lithium sulfur battery

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