合成时间对LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2结构与电化学性能的影响  

Effects of sintering time on structure and electrochemical performance of LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2

作　　者：陈召勇[1] 谢添[1] 李灵均[1] 朱华丽[1,2] 王文华[1] 

机构地区：[1]长沙理工大学物理与电子科学学院,湖南长沙410004 [2]长沙理工大学电力与交通材料保护湖南省重点实验室,湖南长沙410004

出　　处：《电源技术》2015年第6期1179-1182,共4页Chinese Journal of Power Sources

基　　金：教育部留学回国人员科研启动基金([2011]1139);电力与交通材料保护湖南省重点实验室开放基金(2013CL07)

摘　　要：采用球形Ni0.5Co0.2Mn0.3（OH）2前驱体与Li2CO3混合,通过高温烧结合成层状Li Ni0.5Co0.2Mn0.3O2正极材料,研究了合成时间对材料结构及电化学性能的影响。扫描电子显微镜法（SEM）表明Li Ni0.5Co0.2Mn0.3O2正极材料与前驱体形貌均为理想的球形。X射线衍射光谱法（XRD）分析表明,在不同合成时间下合成的样品均为具有层状结构的纯相物质。电化学性能测试表明,900℃12 h合成的样品具有最优的电化学性能,在2.7~4.4 V电压区间,0.1 C、1 C、5 C的首次放电比容量分别达到195.2、158.4和114.9 m Ah/g,1 C循环10次容量保持率为98.9%。LiNi0.5Co0.2Mn0.3O2 layered materials were synthesized by solid-state reaction using Li2CO3 and three transition-metal hydroxide precursors of composition （Ni0.5Co0.2Mn0.3）（OH）2. The effects of sintering time on the structure and electrochemical performances of LiNi0.5Co0.2Mn0.3O2 were investigated. The SEM results reveal that the LiNi0.5Co0.2Mn0.3O2 cathode material and the precursor are ideally spherical. The XRD results show that all the LiNi0.5Co0.2Mn0.3O2 synthesized at different sintering time are purity phase materials with layered structure. The electrochemical property study shows that the sample synthesized at 900℃ for 12 h exhibits excellent electrochemi- cal performance. At 2.7-4.4 V, the discharge specific capacities reach 195.2, 158.4 and 114.9 mAh/g at 0.1 C, 1 C and 5 C. The discharge capacity retention is 98.9% at 1 Cafter 10 cycles.

关 键 词：锂离子电池 正极材料 LiNi0.5Co0.2Mn0.3O2 合成时间 

分 类 号：TM912.9[电气工程—电力电子与电力传动]