Abstract: Due to its low cost and high capacity，layered Li-Ni-Co-Mn-O has already been industrialized and partially replaced traditional LiCoO2 as cathode material for commercial lithium-ion battery. Among various synthetic methods for Li-Ni-Co-Mn-O，co-precipitation becomes an attractive choice because of its low cost and stability. In this paper，we qualitatively analyzed the particulate and thermodynamic processes of co-precipitation method. Then influences of process parameters (aging time，temperature，pH value，etc) on the structure and performance of product were discussed in detail. The ranges of certain process parameters were confirmed according to statistics and the analyses conducted before. The concept of effective feeding rate was put forward，with which a series of variables were derived for a complete description of feeding process. Further researches on the synthesis of primary particles with preferred orientation and the investigation of appropriate fluid environment for co-precipitation should be conducted in the future.

Key words: lithium-ion battery, Li-Ni-Co-Mn-O, co-precipitation, particulate processes, thermodynamics, process parameters

摘要： 锂电池层状Li-Ni-Co-Mn-O正极材料凭借其低成本、高容量的优势，已实现产业化并开始取代传统正极材料LiCoO2。合成该材料的方法很多，共沉淀法因经济性与稳定性受到人们亲睐。本文定性地分析了共沉淀法合成Li-Ni-Co-Mn-O涉及的颗粒过程及热力学过程，详细探讨了共沉淀的工艺参数，如陈化时间、反应温度、pH值等对产物结构、性能的影响规律。根据分析与统计结果，明确了部分工艺参数的取值范围，提出了“有效加料速度”的概念，并引出完整描述加料过程所需要的全部变量，指出合成择优取向的一次颗粒、探索利于共沉淀的流体环境是下一步的研究方向。

关键词: 锂离子电池, Li-Ni-Co-Mn-O, 共沉淀, 颗粒过程, 热力学, 工艺参数