高容量锂离子正极材料LiNi_(0.5)Co_(0.3)Mn_(0.2)O_2的制备与性能  

Preparation and performance of LiNi_(0.5)Co_(0.3)Mn_(0.2)O_2 as high capacity cathode material

作　　者：钟盛文[1] 金柱[1] 梅文捷 陈鹏[1] 刘熙林 

机构地区：[1]江西理工大学材料科学与工程学院,江西赣州341000

出　　处：《电源技术》2016年第1期24-27,共4页Chinese Journal of Power Sources

基　　金：国家自然科学基金(51372104)

摘　　要：采用化学共沉淀法预先合成球形前驱体Ni0.5Co0.2Mn0.3（OH）2,再与锂源共混后高温煅烧合成高容量正极材料Li Ni0.5Co0.3Mn0.2O2。探讨了不同烧结制度对材料结构性能的影响。X射线衍射（XRD）结果表明,产物结构为α-Na Fe O2型层状结构。扫描电子显微镜（SEM）显示材料具有良好的球形形貌。测试材料的电化学性能,在2.75~4.20 V和2.75~4.35 V充放电截止电压,0.5 C充放电电流下,首次放电比容量分别为162.2和172.6 m Ah/g,循环3周后容量保持率分别为96.73%和94.62%。材料还表现出良好的倍率性能。Sphercal precursor Ni0.5Co0.2Mn0.3 （OH）2 was synthesized by chemistry co-precipitation method as raw material, which was then blemded with LifO3 and incinerated to gained the Li Ni0.5Co0.3Mn0.2O2with high capacity. The influence of different sintering system on the materials characteristic was investigated. The X-ray diffraction （XRD） indicates that the materical can be indexed by a hexagonal （x-NaFeO2 layer structure. The scanning electron microscope （SEM） indicates that the material has favorable spherical pattern. In the range of 2.75-4.20 V and 2.75-4.35 V, at 0.5 C of the current density, the first specific capacity was 162.2 mAh ·g-1 and 172.6 mAh .g-1 respectively. After three weeks cycle, the capacity retention was 96.73% and 94.62% respectively. Besides, the material also showed good rate performance.

关 键 词：锂离子电池 LiNi0.5Co0.3Mn0.2O2 正极材料 高容量 

分 类 号：TM912[电气工程—电力电子与电力传动]