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Preparation method of iron phosphate dihydrate

A technology of iron phosphate dihydrate and phosphoric acid, which is applied in the chemical industry, can solve problems such as complex process and difficult control, and achieve the effects of simple production process, low cost and reduced production cost

Inactive Publication Date: 2016-08-24
SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the ferric phosphate whose crystal structure, iron-phosphorus ratio, hydroxyl group, ammonium root and crystal water are not determined is directly used as a raw material to prepare lithium iron phosphate, it will be difficult to control the ratio of lithium-iron-phosphorus in the final raw material mixture. Lithium iron phosphate requires 1:1:1, and the process is complex

Method used

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  • Preparation method of iron phosphate dihydrate
  • Preparation method of iron phosphate dihydrate

Examples

Experimental program
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Effect test

Embodiment 1

[0062] A kind of iron phosphate dihydrate (FePO 4 ﹒ 2H 2 O) The preparation method includes the following steps:

[0063] (1) Add 115 parts of phosphoric acid to 400 parts of deionized water to prepare a phosphoric acid solution, and control the temperature of the solution to 60 o C. Under agitation, slowly add 56 parts of reduced iron powder and react for 2 hours. The product is added to the ball mill and ball milled for 2 hours to obtain ball mill material A;

[0064] (2) Take out the ball mill material A obtained in step (1), add 56 parts of hydrogen peroxide to it, stir evenly and put it into a reaction kettle for treatment at a temperature of 60°C and a time of 12 hours to obtain a reaction product B;

[0065] (3) The reaction product B obtained in step (2) is uniformly stirred and dispersed, and then spray-dried at 170° C. to obtain iron phosphate dihydrate powder.

[0066] X-ray diffractometer (XRD, Rigaku, Japan) was used to detect the iron phosphate dihydrate powder obtained...

Embodiment 2

[0069] A kind of iron phosphate dihydrate (FePO 4 ﹒ 2H 2 O) The preparation method includes the following steps:

[0070] (1) Add 121 parts of phosphoric acid to 400 parts of deionized water to prepare a phosphoric acid solution, and control the temperature of the solution to 60 o C. Under agitation, slowly add 56 parts of reduced iron powder and react for 2 hours. The product is added to the ball mill and ball milled for 2 hours to obtain ball mill material A;

[0071] (2) Take out the ball mill material A obtained in step (1), add 62 parts of hydrogen peroxide to it, stir it evenly and put it in a reactor for treatment at a temperature of 100°C and a time of 9 hours to obtain a reaction product B;

[0072] (3) The reaction product B obtained in step (2) is uniformly stirred and dispersed, and then spray-dried at 170° C. to obtain iron phosphate dihydrate powder.

[0073] X-ray diffractometer (XRD, Rigaku, Japan) was used to detect the iron phosphate dihydrate powder obtained in Exa...

Embodiment 3

[0075] A kind of iron phosphate dihydrate (FePO 4 ﹒ 2H 2 O) The preparation method includes the following steps:

[0076] (1) Add 126 parts of phosphoric acid to 400 parts of deionized water to prepare a phosphoric acid solution, and control the temperature of the solution to 60 o C. Under agitation, slowly add 56 parts of reduced iron powder and react for 2 hours. The product is added to the ball mill and ball milled for 2 hours to obtain ball mill material A;

[0077] (2) Take out the ball mill material A obtained in step (1), add 68 parts of hydrogen peroxide to it, stir evenly and put it into a reactor for treatment at a temperature of 140°C and a time of 6 hours to obtain a reaction product B;

[0078] (3) The reaction product B obtained in step (2) is uniformly stirred and dispersed, and then spray-dried at 170° C. to obtain iron phosphate dihydrate powder.

[0079] X-ray diffractometer (XRD, Rigaku, Japan) was used to test the iron phosphate dihydrate powder obtained in Exampl...

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Abstract

The invention provides a preparation method of iron phosphate dihydrate. The method comprises the following steps: adding 115-126 parts by weight of phosphoric acid to 400 parts by weight of deionized water to prepare a phosphoric acid solution and keeping the temperature of the solution at 50-65 DEG C; adding 56 parts by weight of reduced iron powder in a stirring state, reacting for 1-3 hours, adding the obtained product to a ball mill for ball-milling to obtain a ball-milled material; putting the taken ball-milled material into a container, adding 56-68 parts of hydrogen peroxide, stirring the hydrogen peroxide evenly and then putting the hydrogen peroxide into a reaction kettle for treatment at 60-140 DEG C for 6-12 hours to obtain a reaction product; and stirring and dispersing the reaction product evenly and then carrying out spray drying at 150-180 DEG C to obtain the iron phosphate dihydrate. The iron phosphate dihydrate synthesized by the method has the characteristics of being high in purity, simple in preparation technology, low in cost and free of pollution in treatment, and can be used as a raw material of producing lithium iron phosphate.

Description

Technical field [0001] The invention belongs to the field of chemical industry, and relates to a lithium ion battery material, specifically a method for preparing iron phosphate dihydrate. Background technique [0002] As the upstream of the new energy automobile industry chain, the lithium battery industry has gradually entered a stage of rapid development. However, the cost of power lithium batteries accounts for a relatively high proportion of the cost of new energy vehicles, close to 40%. Therefore, controlling the cost of lithium battery raw materials and developing new lithium battery materials are currently the focus of many lithium battery manufacturers and R&D institutions. Most domestic power batteries use lithium iron phosphate batteries and ternary batteries, which are used in new energy cars and buses. Lithium iron phosphate batteries are relatively safe, and their costs have dropped significantly in recent years. Considering the maturity and economy of battery tec...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 常程康陈雪平陈杰郭倩钟国兵郭芸芸伍凤云
Owner SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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