有色金属科学与工程Issue(4)：52-57,6.DOI:10.13264/j.cnki.ysjskx.2015.04.011
烧结气氛对无钴镍基正极材料LiNi0.7Mn0.3O2性能的影响
Effect of sintering atmosphere on electrochemical performance of cobalt free nickel rich LiNi0.7Mn0.3O2 cathode material
摘要
Abstract
The LiNi0.7Mn0.3O2 cathode material was synthesized under different sintering atmosphere via co-precipitation and high temperature sintering method. The morphology, crystal structure, oxygen concentration, electrochemical performance and electrochemical impedance spectroscopy for LiNi 0.7Mn0.3O2 cathode material were characterized and tested by means of scanning electron microscopy (SEM), powder X-ray diffraction (XRD), oxygen analyzer, galvanostatic charge-discharge tests and electrochemical workstation. The results show that under the condition of whole sintering time in high purity oxygen atmosphere, the obtained material exhibits the best spherical morphology, the most complete layer structure, the best electrochemical performance and the smallest internal impedance. The initial discharge specific capacity of the material is as high as 191.0 mAh/g at 0.2 C within the voltage range of 2.75~4.35 V, the capacity retention ratio is 95.2 %after 70 cycles. But when the materials are synthesized in other sintering atmosphere, the initial discharge specific capacity are all below 184.0 mAh/g, and the capacity retention ratio are also all below 85 % after 70 cycles.关键词
气氛/LiNi0.7Mn0.3O2/无钴/共沉淀/锂离子电池Key words
atmosphere/LiNi0.7Mn0.3O2/cobalt free/co-precipitation/lithium ion battery分类
矿业与冶金引用本文复制引用
陈鹏,钟盛文,梅文捷,刘熙林,金柱,胡经纬..烧结气氛对无钴镍基正极材料LiNi0.7Mn0.3O2性能的影响[J].有色金属科学与工程,2015,(4):52-57,6.基金项目
国家自然科学基金资助项目 （）
