摘要
通过水热法成功制备了一种富锂正极材料Li_(1.166)(Mn_(0.6)Ni_(0.2)Co_(0.2))_(0.834)O_2.并通过X射线衍射(XRD)、扫描电子显微镜(SEM)和高精度电池测试系统分别对电极材料的结构、形貌和电化学性能进行了表征和测试分析.结果表明,样品Li_(1.166)(Mn_(0.6)Ni_(0.2)Co_(0.2))_(0.834)O_2具有较好的多面体结构特点以及优异的电化学性能,该电极材料的充放电比容量相对于商用LiCoO_2材料(约135 m Ah/g)更高,在电流密度25 mA/g时,充放电比容量分别为363.8 mAh/g和222.2 mAh/g,首次库仑效率为61.1%.循环80周之后可逆放电比容量可达235.5 m Ah/g.该富锂正极材料Li_(1.166)(Mn_(0.6)Ni_(0.2)Co_(0.2))_(0.834)O_2在高能量密度动力电池发展中具有良好的应用前景和广阔的市场空间.
The Li-rich layered Li_(1.166)(Mn_(0.6)Ni_(0.2)Co_(0.2))_(0.834)O_2 cathode materials were successfully synthesized through the hydrothermal method. The structure and morphology of the materials were characterized by X-ray diffraction( XRD) and scanning electron microscopy( SEM),and the electrochemical performances were tested by battery test system. The results indicate that the sample Li_(1.166)(Mn_(0.6)Ni_(0.2)Co_(0.2))_(0.834)O_2 shows a polygon morphology and excellent electrochemical performance. The first charge and discharge capacities of the sample are 363.8 and 222.2 m Ah/g,respectively,with an initial coulombic efficiency of 61. 1% at a constant density of 25 m A/g. A reversible discharge specific capacity of approximately 235.5 m Ah/g is obtained after 80 cycles. The lithium-rich Li_(1.166)( Mn_(0.6)Ni_(0.2)Co_(0.2))_(0.834)O_2 cathode material will be a promising candidate with good application prospect and broad market space in the development of high-energy density power batteries.
出处
《华南师范大学学报（自然科学版）》
CAS
北大核心
2017年第6期34-38,共5页
Journal of South China Normal University(Natural Science Edition)
基金
国家自然科学基金-广东省联合基金(U1601214)
广东省科技计划项目(2017B090901027,2016A050503040,2016B010114002)
广州市科技计划项目(201607010322)
华南师范大学物理与电信工程学院蓝盾信息安全技术联合实验室开放基金(LD20170210)
关键词
锂离子电池
富锂正极
水热法
多边形结构
Lithium-ion batteries
Li-rich cathode
hydrothermal method
polygon structure
