Iron phosphate crystal and preparation method thereof

The invention relates to the technical field of iron phosphate, in particular to an iron phosphate crystal and a preparation method thereof. The invention discloses an iron phosphate crystal. The weight ratio of Fe to P in the iron phosphate crystal is 0.96-0.985; the preparation method of the iron phosphate comprises the following steps: adding an iron salt solution, a monoammonium phosphate solution and hydrogen peroxide into a reaction kettle, and carrying out early-stage reaction on the obtained mixed solution at 90-100 DEG C; after the earlier-stage reaction is finished, performing an out-of-kettle circular reaction at 85-90 DEG C; the prepared iron phosphate with the weight ratio of Fe to P being 0.95-0.985 is beneficial to preparation of high-performance lithium iron phosphate. 本发明涉及磷酸铁技术领域，特别是涉及一种磷酸铁晶体及其制备方法。本申请公开了一种磷酸铁晶体，所述磷酸铁晶体中Fe和P的重量比为0.96-0.985；磷酸铁的制备方法，包括以下步骤：将铁盐溶液、磷酸一铵溶液、双氧水，加入到反应釜中，得到的混合液在90-100℃下进行前期反应；前期反应结束后，在85-90℃下进行釜外循环反应。本申请制备得到的具有Fe和P的重量比为0.95-0.985的磷酸铁，有益于制备高性能的磷酸铁锂。