Li[Li_(0.2)Ni_(0.2)Mn_(0.6)]O_2富锂正极材料的制备及性能研究  

Synthesis and performance of Li[Li_(0.2)Ni_(0.2)Mn_(0.6)]O_2 Li-rich cathode materials

作　　者：张林森[1] 金恺[1] 宋铁峰 马振[1] 孙阳[1] 

机构地区：[1]郑州轻工业学院材料与化学工程学院河南省表界面科学重点实验室,河南郑州450002 [2]灵宝华鑫铜箔有限责任公司,河南灵宝472500

出　　处：《电源技术》2015年第6期1191-1193,1200,共4页Chinese Journal of Power Sources

基　　金：河南省高校青年骨干教师资助计划资助(GGJS116);河南省教育厅科学技术研究重点项目(13A530366);郑州轻工业学院校级青年骨干教师培养对象资助计划资助(2011XGGJS005);2013年国家级大学生创新创业训练计划项目(201310462096)

摘　　要：通过液相法制得了球形Ni(OH)2,再与Mn(NO3)2、CH3COOLi通过固相法制备了富锂正极材料Li[Li0.2Ni0.2Mn0.6]O2。通过X射线衍射光谱法(XRD)、扫描电子显微镜法(SEM)、粒度分析仪、循环伏安、交流阻抗以及充放电测试对样品的结构、形貌和电化学性能进行了表征。结果表明,合成温度为900℃时,材料结晶度高,阳离子混排程度低,颗粒表面光滑均一;在20 m A/g时,首次放电比容量为174.02 m Ah/g,在60 m A/g的高倍率放电条件下比容量仍可达到80.56m Ah/g。Li[Li0.2Ni0.2Mn0.6]O2 Li-rich cathode materials were synthesized by solid-state method with Mn （NO3）2, CH3COOLi and spherical Ni（OH）2 prepared by liquid -state method. Then XRD, SEM, particle size analysis, CV, AC impedance and charge/discharge test were used to investigate the structure, morphology and electrochemical performance of the material. The results show that materials synthesized at 900℃ have high crystallinity, low cation mixing degree and smooth surface. The initial discharge specific capacity is 174.02 mAh/g at 20 mA/g. The discharge specific capacity is up to 80.56 mAh/g even at the high rate of 60 mA/g.

关 键 词：锂离子电池 Li[Li0.2Ni0.2Mn0.6]O2 高温固相法 球形NI(OH)2 

分 类 号：TM912.9[电气工程—电力电子与电力传动]