622镍钴锰氢氧化物制备试验研究

Experimental Study on the Preparation of 622 Nickel-Cobalt Manganese Hydroxide

摘要: 本论文使用液相沉淀法。以硫酸镍晶体、硫酸钴晶体和硫酸锰晶体为原料，氨水为底液和缓冲剂，氢氧化钠为沉淀剂，通过调节溶液的pH值、反应温度、反应时间，并借助激光粒度分析、化学分析手段，对合成样品的粒度分布、化学性能等进行分析研究，找出在该方法下镍钴锰配比为6:2:2的三元前驱体材料较好的合成工艺参数。研究结果得出：当溶液的pH值为11.4，反应温度为50℃，反应时间为5小时，所制备的镍钴锰三元前驱体材料性能最佳。此时振实密度为2.28 g/cm3，粒度D50为10.66 μm，镍钴锰的含量M (Ni + Co + Mn)%为56.58%。此研究结果对后续合成镍钴锰酸锂正极材料有一定的参考意义。

Abstract: The liquid phase precipitation method is used in this experiment. Using nickel sulfate crystal, co-balt sulfate crystal and manganese sulfate crystal as raw materials, ammonia water as base fluid and buffering agent, sodium hydroxide as precipitator, by adjusting the pH value of the solution, the reaction temperature and the reaction time, the particle size distribution and chemical properties of the synthetic samples were analyzed by means of laser particle size analysis and chemical analysis. The better synthetic process parameters of the three element precursor materials with the ratio of nickel, cobalt and manganese to 6:2:2 under this method were found. The results are as follows: when the pH value of the solution is 11.4, the reaction temperature is 50˚C, and the reaction time is 5 h, and the properties of the prepared nickel, cobalt and manganese three precursor are the best. The compaction density is 2.28 g/cm3; the particle size D50 is 10.66 μm; and the M (Ni + Co + Mn)% is 56.58%. The research results have some reference significance for the subsequent synthesis of nickel cobalt lithium manganate cathode materials.