FePO4 with controllable morphology, preparation method thereof and lithium iron phosphate

The invention discloses shape-controllable iron phosphate, a preparation method thereof and lithium iron phosphate, and belongs to the field of lithium battery positive electrode material lithium iron phosphate. The method comprises the following steps: dissolving ferric salt in water to prepare a ferric salt solution; preparing a phosphate solution from phosphoric acid and an alkali solution; adding the ferric salt solution into a stirring reaction kettle, then sequentially adding phosphoric acid and hydrogen peroxide into the reaction kettle, then adding the phosphate solution into the reaction kettle, heating to carry out a synthetic reaction, and aging to obtain a precipitate; filtering the precipitate, washing with deionized water, drying, and sieving to obtain iron phosphate dihydrate; and sintering and sieving the iron phosphate dihydrate to obtain the anhydrous iron phosphate. According to the invention, iron phosphate with different sheet shapes can be prepared by adjusting process parameters, and li