多相氧化还原法制备钴酸锂前驱体的研究

Study on Preparation of Precursor for LiCoO_2 by Multiphase Redox Method

通过多相氧化还原法制得钴酸锂前驱体。XRD分析表明:合成的前驱体具有钴酸锂的晶型特征,与标准钴酸锂XRD的特征峰完全一致;扫描电镜(SEM)分析结果表明:二次粒子非常均匀,分散状态良好。同时研究了反应温度、反应时间和Li+浓度等工艺条件对合成钴酸锂前驱体的影响,得出合成该前驱体的最佳条件为:反应温度75～85℃,反应时间6～8 h,Li+浓度20～30 g/L。此条件下,可以合成比表面积(BET)20～50 m2/g,粒径100 nm左右,Li、Co摩尔比为0.7～1.0的钴酸锂前驱体。

The precursor for LiCoO2 cathode material was prepared by multiphase redox method. The XRD patterns indicate that the precursor is of the same crystal characteristics of LiCoO2 and fully consistent with the standard XRD patterns of LiCoO2. The results of SEM show the secondary particles are dispersed well. The effects of process conditions （the reaction temperature, the reaction time, the Li ＋ concentration and so on） on the preparation of precursor for LiCoO2 cathode materials have been studied, with the best conditions for synthesis of the precursor obtained as follows ： the reaction temperature is 75 - 85℃ , the reaction time is 6 - 8 h and the Li ＋ concentration is 20 - 30 g/L. Under these conditions, the precursor with BET of 20 - 50 m2/g, particle size of about 100 nm and Li, Co molar ratio of 0.7 - 1.0 has been synthesized.