Preparation method of iron phosphate

Abstract

The invention relates to the technical field of energy materials, and in particular relates to a preparation method of iron phosphate. Relatively pure iron and a small amount of iron oxide are used as raw materials to react with phosphoric acid to obtain iron phosphate which is then water-washed and oven-dried to obtain an iron phosphate product with uniform particle size and excellent tap density. The preparation method of iron phosphate, provided by the invention, dispenses with the treatment of the byproduct salts generated during iron phosphate production from phosphate and an iron salt; the preparation method controls the properties of iron phosphate through a high pressure oxidation process, so as to effectively improve the tap density and other properties; and the preparation method effectively reduces material loss, reduces the phosphorus content in sewage and reduces the difficulty of sewage treatment through rectification, purification and reuse of phosphoric acid, thus achieving the purpose of green production.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion battery cathode materials, and specifically relates to a method for preparing iron phosphate. Background technique [0002] Iron phosphate is also known as high iron phosphate, the English name is iron(iii)phosphate tetrahydrate, and the CAS number is 10045-86-0. [0003] Lithium-ion battery is a new generation of green high-energy battery, with many advantages such as high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, wide operating temperature range, etc. It is widely used in mobile phones, notebook computers, and digital cameras. , Camcorders, electronic meters, etc., also have bright application prospects in UPS, power tools, electric bicycles, electric cars, energy storage batteries and other fields. In recent years, the output of lithium-ion batteries has grown rapidly, and their application fields have been expanding. They have become high-tech ...

AI Technical Summary

Problems solved by technology

[0006] The ferric phosphate produced by using iron and its oxides as the iron source has advantages over the ferric phosphate produced by iron salt, but compared with the ferric phosphate produced by iron salt, its crystal form is slightly worse and the particle size is larger. For the production of ferric phosphate Said to be a relatively urgent problem to be solved