Preparation method of flaky iron phosphate, the prepared flaky iron phosphate and application of the flaky iron phosphate

Abstract

The invention discloses a preparation method of flaky iron phosphate, the prepared flaky iron phosphate and application of the flaky iron phosphate. The preparation method comprises the following steps: 1, preparing a ferrite solution, adding phosphoric acid, and adding an oxidant to oxidize ferrous ions into iron ions; 2, preparing a mixed solution from phosphoric acid and sodium hydroxide; 3, heating the mixed solution to 90-100 DEG C, and adding an iron ion solution; and 4, calcining the prepared product to obtain the flaky iron phosphate. In the method, feeding is performed at high temperature, so that almost no yellow intermediate is generated in the feeding process, and a white flaky iron phosphate product is rapidly formed in the feeding process; the process avoids the traditional process of adding a phosphorus salt into an iron salt to generate a yellow intermediate and then gradually turn the yellow intermediate into white. The flaky iron phosphate prepared by the scheme provided by the invention is higher in grinding efficiency and lower in sulfur content; therefore, when the method is applied to the preparation process of lithium iron phosphate, higher battery capacity can be obtained.

Description

technical field [0001] The invention relates to the technical field of new energy, in particular to a method for preparing flaky iron phosphate, the prepared flaky iron phosphate and applications thereof. Background technique [0002] With the country's strong support for the new energy vehicle industry, the global lithium-ion battery market is expanding exponentially. At present, the most widely used lithium-ion batteries are lithium manganese oxide, lithium iron phosphate and ternary batteries. Among them, lithium iron phosphate batteries have become a new generation due to their advantages such as wide source of raw materials, low price, good safety performance and long cycle life. Ideal cathode material for lithium-ion batteries. Iron phosphate is an important precursor for the preparation of lithium iron phosphate, and its performance determines various main properties of lithium iron phosphate. Therefore, the preparation of iron phosphate with excellent performance is...

AI Technical Summary

Problems solved by technology

Although researchers at home and abroad have done a lot of research on improving the performance of iron phosphate, and have achieved some good results, there are still defects, such as the high content of S in the process of preparing iron phosphate from ferrous sulfate, and the synthesis of phosphoric acid from iron phosphate. Problems such as poor grinding efficiency for iron lithium

Images