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Preparation method of flaky iron phosphate dihydrate

A technology of phosphoric acid dihydrate, iron phosphate, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as unfavorable industrial production and application, complex synthesis process, etc., and achieve the effects of good electrochemical performance and easy operation.

Active Publication Date: 2020-03-24
HUNAN YACHENG NEW MATERIAL CO LTD
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Problems solved by technology

However, the synthesis process of flake iron phosphate in the prior art is relatively complicated, which is not conducive to industrial production and application

Method used

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

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preparation example Construction

[0022] Embodiments of the present invention are: a preparation method of flaky ferric phosphate dihydrate, such as figure 1 shown, including the following steps:

[0023] (1) Weigh 834g of ferrous sulfate and dissolve it in 1.5L of water, add 58.8g of sulfuric acid and 270g of hydrogen peroxide, and after the ferrous sulfate is completely oxidized into ferric sulfate, set the volume to 2L;

[0024] (2) Take by weighing 36.24g sodium metaaluminate and be dissolved in 500ml water;

[0025] (3) Weigh 345.09g of monoammonium phosphate and add water to dissolve it, add the sodium metaaluminate solution in (2) to the monoammonium phosphate solution, add water to make the volume to 2L;

[0026] (4) Add the ferric sulfate solution in (1) into the reaction kettle as the reaction bottom liquid, set the stirring speed as 200r / min, and inject the monoammonium phosphate solution with sodium metaaluminate in (3) into the reactor with a peristaltic pump Reactor; feeding time is 30min;

[...

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Abstract

The invention discloses a preparation method of flaky iron phosphate dehydrate. The method comprises the following steps: S1, taking an iron source, preparing an iron salt solution, taking metaaluminate and phosphate, and preparing a mixed solution; S2, adding the mixed solution into the iron salt solution, adding phosphoric acid, performing stirring until uniformity, and reacting the obtained mixture to prepare an iron phosphate slurry; and S3, washing the iron phosphate slurry, and drying the washed slurry to obtain the flaky iron phosphate dihydrate. An Al(OH)3 colloid is formed by metaaluminate in the iron phosphate synthesis process, and hydroxyl groups of the Al(OH)3 colloid adsorb the specific crystal face of a crystal nucleus to reduce the surface energy of the crystal face in order to decrease the growth speed of the crystal face, and other crystal faces grow at a normal speed to form two-dimensional flaky iron phosphate; and the preparation method is simple to operate, and when the iron phosphate prepared by the method is used for preparing lithium iron phosphate, good electrochemical performances can be obtained.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a method for preparing flaky ferric phosphate dihydrate. Background technique [0002] Environmental pollution and resource depletion are two major problems facing the world at present. New energy vehicles do not use fossil energy and emit less pollution, which is a key promotion project in countries all over the world. Lithium iron phosphate battery material has the advantages of high specific capacity, good high temperature performance, and long service life, and is currently the mainstream battery material used in new energy vehicles. However, the disadvantage of lithium iron phosphate batteries is that the diffusion coefficient of lithium ions is small, resulting in poor performance of lithium iron phosphate batteries. Iron phosphate is an important precursor for the synthesis of lithium iron phosphate, and its structure and morphology have a great influenc...

Claims

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Application Information

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IPC IPC(8): C01B25/37
CPCC01B25/375C01P2006/82C01P2004/20C01P2004/03C01P2006/40
Inventor 王玉龙张州辉刘志成李芳萍万文治
Owner HUNAN YACHENG NEW MATERIAL CO LTD
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