Abstract: Transition metal oxide trimanganese tetraoxide has been widely utilized in the field of energy storage, particularly in the battery industry, due to its distinctive structural characteristics and physicochemical properties. In recent years, the battery industry has placed higher demands on the product quality of trimanganese tetraoxide, with product tap density being one of the key factors affecting battery material performance. Its magnitude directly impacts the energy density, power density, and safety performance of the battery, while better tap density also contributes to enhancing the battery's cycle stability. During the study, it was found that the roasting system had a significant influence on the tap density of the roasted products. Therefore, to enhance the tap density of trimanganese tetraoxide, this study employed high-purity manganese sulfate as the raw material and ammonia as the precipitating agent to prepare trimanganese tetraoxide with high tap density through the precipitation-roasting method of manganese sulfate solution. The effects of precipitation reaction parameters and thermal system on the tap density of trimanganese tetraoxide were explored, and the morphology, structure, and composition of manganese trioxide products were characterized. The experimental results indicated that under the optimal process conditions, with an ammonia-to-manganese ratio of 3:1, a manganese sulfate concentration of 2.0 mol/L, a roasting temperature of 1150℃, a roasting time of 4 hours, and a forced ventilation roasting atmosphere, the best outcomes were achieved. Under these conditions, the manganese content of trimanganese tetraoxide was 71.91wt%, with a D50 of 10.723 μm and a specific surface area of 1.786 m2/g, exhibiting a spherical morphology. The content of trace elements met the requirements, and the tap density was 2.85 g/cm3, meeting the industry standard for high-purity trimanganese tetraoxide.

Key words: tap density, manganese sulfate, precipitation-roasting method, trimanganese tetraoxide

摘要： 过渡金属氧化物四氧化三锰因其独特的结构特征和物理化学性质，在储能领域尤其是电池行业有着广泛的应用。近年来，电池行业对四氧化三锰的产品质量提出更高的要求，其中产品振实密度是影响电池材料性能的关键因素之一。因此，为提高四氧化三锰的振实密度，本研究以高纯硫酸锰为原料，以氨水为沉淀剂，采用硫酸锰溶液沉淀-焙烧法制备高振实密度四氧化三锰，探究沉淀反应参数及热工制度对四氧化三锰振实密度的影响，并对四氧化三锰产物形貌、结构和组成方面进行表征。实验结果表明，最优工艺条件为氨锰比3:1、硫酸锰浓度2.0 mol/L、焙烧温度1150℃、焙烧时间4 h、焙烧气氛强制通风，该条件下获得的四氧化三锰锰含量为71.91wt%，D50为10.723 μm，比表面积为1.786 m2/g，形貌为类球形，微量元素含量符合要求且振实密度达到2.85 g/cm3，满足高纯四氧化三锰的行业标准。

关键词: 振实密度, 硫酸锰, 沉淀-焙烧法, 四氧化三锰