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.
The prepared V 2O 5 hollow spheres were reduced to V 2O 3 hollow spheres with the assistance of NH 3 at high temperature. The morphology and structure of the V 2O 3 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 V 2O 3 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 V 2O 3 hollow sphere in the lithium sulfur battery can effectively improve the cycle performance.
作者
李新
陈良
马晓涛
张鼎
徐守冬
周娴娴
段东红
刘世斌
LI Xin;CHEN Liang;MA Xiaotao;ZHANG Ding;XU Shoudong;ZHOU Xianxian;DUAN Donghong;LIU Shibin(College of Chemistry and Chemical Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2019年第9期1972-1978,共7页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:21706171,21506141,21606158)
山西省重点研发计划项目(批准号:201803D121120)资助~~
关键词
三氧化二钒
正极材料
锂硫电池
Vanadium trioxide
Cathode material
Lithium sulfur battery
