液相沉淀法制备四氧化三钴技术改进研究

　　

摘要：针对锂电池正极材料钴酸锂前驱体—四氧化三钴生产实践中遇到的问题，开发设计了液相合成制备纯相四氧化三钴生产技术，以氯化钴溶液为钴源，氢氧化钠为沉淀剂，乙二胺四乙酸为络合剂，空气为氧化剂，控制合成条件，直接液相合成纯相氧化钴，再经低温烘干制得四氧化三钴粉末。该工艺流程精简、生产周期短（≤18小时）、生产中无氨氮废水排放、能耗低，且产品活性高。产品为高球形度球形颗粒，振实密度为2.9±0.3g/cm³、比表面积为1.8±0.8m²/g。

关键词：锂电池；正极材料；四氧化三钴；液相合成；工艺优化

Abstract: In response to the problems encountered in the production practice of cobalt tetroxide, a precursor of lithium cobalt oxide as a cathode material for lithium batteries, a production technology for preparing pure cobalt tetroxide by liquid phase synthesis was developed and designed. Using cobalt chloride solution as a cobalt source, sodium hydroxide as a precipitator, ethylenediamine tetraacetic acid as a complexing agent, and air as an oxidant, the synthesis conditions were controlled, and pure cobalt tetroxide was directly synthesized in liquid phase, followed by low-temperature drying to obtain cobalt tetroxide powder. This process is characterized by simplified process flow, short production cycle (≤ 18 hours), no ammonia nitrogen wastewater discharge during production, low energy consumption, and high product activity. The product is a spherical particle with high sphericity, a compacted density of 2.9 ± 0.3 g/cm3, and a specific surface area of 1.8 ± 0.8 m2/g.

Key words: lithium battery; Positive electrode material; Cobalt Tetroxide; Liquid phase synthesis; Process optimization

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