(中南大学 冶金科学与工程学院，长沙 410083)
摘 要: 采用快速共沉淀法制备Ni0.8Co0.1Mn0.1(OH)2前驱体，利用前驱体与LiOH·H2O的高温固相反应得到锂离子电池层状正极材料LiNi0.8Co0.1Mn0.1O2，探讨pH值对材料结构和电化学性能的影响。通过X射线衍射(XRD)、扫描电镜(SEM)和电化学测试对合成样品进行表征。结果表明，pH值为11.00~12.00时，合成的Ni0.8Co0.1Mn0.1(OH)2前驱体均无杂相；pH值为11.50时，合成的前驱体制备出的正极材料具有良好的电化学性能，0.1C倍率下首次放电比容量为192.4 mA·h/g；经过40次循环，容量保持率为91.56%。
关键字: 锂离子电池；正极材料；LiNi0.8Co0.1Mn0.1O2；共沉淀法；pH值
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:Ni0.8Co0.1Mn0.1(OH)2 precursors were synthesized by fast co-precipitation method and highly ordered layered LiNi0.8Co0.1Mn0.1O2 was prepared by heat-treatment of Ni0.8Co0.1Mn0.1(OH)2 precursors and LiOH·H2O. The effect of pH value on the structure and electrochemical properties of samples was studied. The prepared samples were characterized by X-ray powder diffractometry(XRD), scanning electron microscopy(SEM) and electrochemical tests. The results show that no impurities exist in the Ni0.8Co0.1Mn0.1(OH)2 synthesized at pH value ranging from 11.00 to 12.00. LiNi0.8Co0.1Mn0.1O2 prepared from Ni0.8Co0.1Mn0.1(OH)2 precursor synthesized under solution pH value of 11.50 shows excellent electrochemical performance. The initial discharge capacity is 192.4 mA·h/g at 0.1C, and the capacity remains 91.56% after 40 cycles.
Key words: lithium ion battery; cathode materials; LiNi0.8Co0.1Mn0.1O2; co-precipitation; pH value
