Preparation method of electrode material high-purity phosphate

Abstract

The invention discloses a preparation method of an electrode material high-purity phosphate. The preparation method is characterized by comprising the following steps: (i) providing an aqueous solution of a first valence M (Va) compound of a metal M with mixed valence property; (ii) adding a precipitant and an oxidizing agent to the aqueous solution of the M (Va) compound to obtain a solid-liquidmixed solution containing metal M in the second valence state M (Vb), wherein the second valence state Vb is greater than the first valence state Va, the solid phase in the solid-liquid mixing is a mixed precipitate containing M (Vb), and the mixed precipitate contains M (Vb) phosphate and / or M (Vb) hydroxide; carrying out solid-liquid separation to obtain a mixed precipitate containing M (Vb); and (iii) adding phosphoric acid and water into the mixed precipitate containing M (Vb), heating to 80-100 DEG C, and reacting to obtain a phosphate product. The method for producing the phosphate is simple and convenient to operate and low in water consumption, and the prepared metal phosphate is high in purity and has a complete nanostructure.

Description

technical field [0001] The invention relates to a preparation method of high-purity phosphate as an electrode material. More specifically, although the present invention illustrates, explains and exemplifies the use of Fe and Mn phosphates as electrode active materials for lithium secondary batteries, the present invention is obviously also applicable to the preparation of high-purity phosphates in other fields. Background technique [0002] The miniaturization of electronic components has created a widespread increase in the use of portable electronic devices such as cell phones, pagers, video recorders, fax machines, portable stereos, personal notebooks and personal computers. As a result, the need for improved power supplies for these devices has increased. In addition, hybrid electric vehicles and pure electric vehicles also require more advanced battery materials to meet the high demand for high-performance batteries for these devices. These advanced battery materials...

AI Technical Summary

Problems solved by technology

However, the current manufacturing cost of traditional iron phosphate is also very high

[0005] Another problem is the traditional method of treating phosphorus materials, which is strictly regulated by the environmental protection agencies of various countries.

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