(中南大学 冶金科学与工程学院，长沙 410083)
摘 要: 采用共沉淀法制备Ni0.8Co0.1Mn0.1(OH)2前驱体，与LiOH·H2O混合后在氧气气氛中焙烧得到LiNi0.8Co0.1Mn0.1O2正极材料，探讨共沉淀反应过程中快速加料和慢速加料制度对前驱体形貌和LiNi0.8Co0.1Mn0.1O2正极材料性能的影响。通过X射线衍射(XRD)、扫描电镜(SEM)和电化学测试对样品进行表征。结果表明：慢速加料法减小了材料的粒径，合成了平均粒径在0.5 μm左右的球形Ni0.8Co0.1Mn0.1(OH)2前驱体，且粒径分布比较集中；所合成LiNi0.8Co0.1- Mn0.1O2正极材料具有良好的层状结构，且无杂相存在；缓慢加料法得到的样品的电化学性能有很大提高，在0.1 C、0.5 C和1 C下首次放电比容量分别达到223.5、194.3和190.7 mA∙h/g，循环30次后，容量保持率为80.09%、80.80%和85.84%。
关键字: 锂离子电池；正极材料；LiNi0.8Co0.1Mn0.1O2；共沉淀
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The mixture of Ni0.8Co0.1Mn0.1(OH)2 precursors were synthesized by co-precipitation, and calcined with LiOH·H2O to produce LiNi0.8Co0.1Mn0.1O2 cathode material in oxygen atmosphere. The influence of the fast feeding rate and slow feeding rate during the process of co-precipitation on the morphology of the precursors and the performance of cathode materials LiNi0.8Co0.1Mn0.1O2 were discussed. The samples were analyzed by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and electrochemical test. The results show that with the slow feeding method, a narrow size-distribution spherical Ni0.8Co0.1Mn0.1(OH)2 precursors are prepared, and the average size is about 0.5 μm. The synthesized cathode materials have good layered structure and no impurity present, the electrochemical performance of the samples obtained by the slow feeding mathod is greatly improved. The first discharge capacities are 223.5, 194.3 and 190.7 mA∙h/g at 0.1 C, 0.5 C and 1 C, respectively, and after 30 cycles, the retention rates of capacity at 0.1 C, 0.5 C and 1 C are 80.09%, 80.80% and 85.84%, respectively.
Key words: lithium-ion battery; cathode material; LiNi0.8Co0.1Mn0.1O2; co-precipitation
