Preparing method of wrapping type phosphate ferromanganese

Abstract

The invention discloses a preparing method of wrapping type phosphate ferromanganese. The method includes the steps of adding phosphoric acid to ferromanganese powder, conducting a stirring reaction until the ferromanganese powder is incompletely dissolved, conducting filtering, adding filtrate to hydrogen peroxide, starting to raise the temperature after adding is completed, conducting a stirringreaction to obtain ferric phosphate slurry, adding sodium dodecyl benzene sulfonate and then manganese carbonate, making manganese carbonate completely dissolved, continuing to add hydrogen peroxide,conducting filtering to obtain mother liquor and filter residues, adding the filter residues to pure water to be washed, drying the washed filter residues in a microwave dryer until the water contentis lower than 1%, and conducting screening, electromagnetic ferric removing and material mixing to obtain the wrapping type phosphate ferromanganese. The method is simple in process, low in cost andsmall in wastewater discharge amount, the phosphate ferromanganese material with ferric phosphate wrapped by manganese carbonate is obtained, the primary particle size is small, the shape is a spherical shape, the tap density is high, the specific surface is small, the size distribution is uniform, and the content of sulfate radicals and chloridion is low.

Description

technical field [0001] The invention relates to a preparation method of coated ferromanganese phosphate, which belongs to the field of lithium battery new energy materials. Background technique [0002] LiMnPO4 (LMP) has the advantages of cheap raw materials, relatively stable structure, high theoretical specific capacity and high discharge voltage platform, and is one of the positive electrode materials for lithium-ion power batteries with great development prospects. However, LMP materials have defects such as low electronic conductivity and ionic conductivity, which limit their large-scale application. Doping Fe in LMP can improve the kinetic performance of the material during charge and discharge. In recent years, methods such as nano-composite carbon coating have been used to greatly improve the electrochemical performance of iron-doped lithium manganese phosphate (LFMP) materials. The latest report shows that PHOSTCH also has the ability to mass produce LFMP, and LFMP...

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Problems solved by technology

[0006] 2. Due to the presence of anions, such as sulfate and chloride ions, the amount of washing water is large. Generally, the amount of sewage per ton of product is greater than 100 tons, and it contains phosphate, sulfate or chloride ions, ammonia nitrogen, etc., resulting in complicated sewage treatment.

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