一步法制备磷酸锰铁

Preparation of Ferromanganese Phosphate by One Step Method

新开发了一种制备磷酸锰铁前驱体材料的方法。在反应釜中加入锰、铁溶液,升温至90℃,随后用蠕动泵滴加KMnO_(4)和磷源混合液,滴加完成后继续升温,在95℃下陈化2 h后抽滤、洗涤。将所得滤饼转移至干燥箱中,在105℃下干燥12 h得到磷酸锰铁前驱体粉末。文章探究了KMnO_(4)滴加速率,NH_(4)H_(2)PO_(4)用量,KMnO_(4)用量,铁、锰比例以及H3PO_(4)用量对磷酸锰铁前驱体合成的影响。优化后的产品晶体结构稳定、理化指标合格、电性能良好,可作为磷酸锰铁锂电池正极材料的前驱体。

A new method for preparing the precursor material of ferromanganese phosphate was developed.Manganese and iron solution were inf lood the reactor,and the temperature was raised to 90℃,and then the mixture of KMnO_(4) and phosphorus solution were added with a peristaltic pump by dripping slowly.With the temperature was continued to rise at 95℃,it was f iltered and washed after aging for 2 h,after the drip is completed.The obtained f ilter cake was transferred to a drying oven and dried at 105℃for 12 h to obtain ferromanganese phosphate precursor powder.In this paper,the effects of KMnO_(4) droplet rate,the amount of NH_(4)H_(2)PO_(4),the amount of KMnO_(4),the ratio of iron to manganese and the amount of H_(3)PO_(4) on the synthesis of ferromanganese phosphate precursor were investigated.After optimization,the sample possess the stable crystal structure,qualif ied physical and chemical indexes and good electrical properties,and can be used as a precursor for lithium ferro manganese phosphate battery cathode materials.