通过共沉淀法在体积为200 L的密闭反应釜内采用连续工艺合成具有类球形形貌的层状前驱体Ni_0.8Co_0.1Mn_0.1（OH）₂，解决了间歇式生产工艺存在的效率低、批次稳定性差等问题。研究了合成过程中搅拌方式、反应温度、pH和络合剂用量对前驱体振实密度的影响，确定了最佳工艺条件。利用前驱体与LiOH·H₂O通过高温固相反应合成LiNi_0.8Co_0.1Mn_0.1O₂材料。用X射线衍射仪（XRD）和扫描电子显微镜（SEM）对材料的晶体结构和形貌进行表征，通过充放电测试研究材料的电化学性能。通过XRD分析可知该材料为典型的六方晶系a-NaFeO₂结构；SEM测试发现产物粒子是由300~800 nm的一次小晶粒堆积形成的二次类球形粒子。电化学测试表明，在2.5~4.3 V电压范围内，在0.2 C倍率下首次放电容量和库仑效率分别为184.1 mAh/g和85.9%，20次循环后容量为166.3 mAh/g，保持率达到90.3%。

Spherical mixed metal hydroxide Ni_0.8Co_0.1Mn_0.1(OH)₂ precursor with layered structure is successfully synthesized via continuous coprecipitation method in a 200 L closed reactor, which solves the problems of low efficiency and poor stability in batch production process.The effects of stirring method, temperature, pH and amount of chelating agent on the tap density of precursor are studied and the optimum synthesis conditions are confirmed.LiNi_0.8Co_0.1Mn_0.1O₂ sample is obtained by high temperature solid phase reaction between the precursors and LiOH·H₂O, and its crystal structure, morphology and electrochemical properties are investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) and charge-discharge test.XRD analysis identifies that this sample has a typical structure of hexagonal a-NaFeO₂ type.It is found through SEM detection that LiNi_0.8Co_0.1Mn_0.1O₂ consists of sphere-like secondary particles that are aggregated by a large amount of primary small particles with an average size of about 300-800 nm.Electrochemical measurements show the initial discharge capacity and the first coulombic efficiency of LiNi_0.8Co_0.1Mn_0.1O₂ at 0.2 C rates are 184.1 mAh·g^-1 and 85.9% respectively in the voltage range of 2.5-4.3 V.After 20 cycles at 0.2 C, the discharge capacity and the discharge capacity retention are 166.3 mAh·g^-1 and 90.3%, respectively.

冯耀华(1982-),男,博士生,研究方向为电化学储能技术,18193154028@163.com。