三元正极材料前驱体MnxNiyCozCO3的合成及条件探究

将硫酸锰、硫酸钴、硫酸镍按物质的量比为0.54∶0.13∶0.13均匀混合配制成溶液，将混合溶液与一定浓度的碳酸氢铵溶液反应，得到三元材料前驱体MnxNiyCozCO3。分别探究了碳酸氢铵溶液的浓度、三元硫酸盐混合溶液与碳酸氢铵溶液的浓度比及反应温度对硫酸盐转化率的影响。结果表明：室温下，当碳酸氢铵溶液的浓度为0.30 mol/L，三元硫酸盐混合溶液与碳酸氢铵溶液的浓度比为1∶5时，硫酸盐的转化率可达91.20%。XRD结果表明产物MnxNiyCozCO3与碳酸锰具有相同的晶相。SEM结果表明产物的形貌为粒径均匀的微米球（粒径为4~6 μm）。该方法简单有效，具有可行性，有望用于三元正极材料前驱体的规模生产。

Synthesis and condition exploration of precursor MnxNiyCozCO3 for ternary cathode material

The precursor MnxNiyCozCO3 of a ternary material has been synthesized by carbonate co-precipitation method，using manganese sulfate，cobalt sulfate，and nickel sulfate（with the mass ratio of 0.54∶0.13∶0.13） as raw materials for metallic ions，and ammonium bicarbonate solution with a certain concentration as a precipitant.The effects of reaction temperature， concentration of ammonium bicarbonate solution，and concentration ratio of sulfate mixed solution and ammonium bicarbonate solution on sulfate conversion rate were investigated.It was found that sulfate conversion rate was as high as 91.20% when the concentration ratio of sulfate and ammonium bicarbonate solution was 1∶5 and the concentration of ammonium bicarbonate solution was 0.3 mol/L.The as-prepared MnxNiyCozCO3 had same phase as that of MnCO3 through XRD.SEM result showed the morphology of product was uniform micro-spheres（at 4~6 μm）.The method is simple，effective and applicable. Therefore，it can be used for large scale preparation of ternary material precursors.