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A kind of iron phosphate and its preparation method and application

A technology of iron phosphate and hydrated iron phosphate, applied in chemical instruments and methods, phosphorus compounds, structural parts, etc., can solve the problems of poor electrochemical performance of lithium iron phosphate and low tap density of iron phosphate

Active Publication Date: 2021-10-01
CHANGSHA UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tap density of the ferric phosphate prepared by the above method is low, only 0.9g / cm 3 , the electrochemical performance of the cathode material lithium iron phosphate synthesized from this raw material is poor

Method used

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  • A kind of iron phosphate and its preparation method and application
  • A kind of iron phosphate and its preparation method and application

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preparation example Construction

[0025] The invention provides a kind of preparation method of ferric phosphate, comprises the following steps:

[0026] (1) mixing the iron salt with the polyamino compound under acidic conditions to obtain the first mixed solution;

[0027] (2) mixing the phosphorus source, the polyhydric alcohol and water to obtain a second mixed solution;

[0028] (3) mixing the first mixed solution obtained in the step (1) with the second mixed solution obtained in the step (2), performing a hydrothermal reaction to obtain ferric phosphate hydrate;

[0029] (4) calcining the ferric phosphate hydrate obtained in the step (3) to obtain ferric phosphate;

[0030] The steps (1) and (2) are in no sequence.

[0031] The invention mixes the iron salt with the polyamino compound under acidic conditions to obtain the first mixed solution.

[0032] In the present invention, the iron salt preferably includes iron sulfate or iron nitrate; the polyamino compound preferably includes at least one of e...

Embodiment 1

[0058] (1) 1 mol of ferric sulfate is mixed with sulfuric acid solution, and then 21 mol of ethylenediamine is added under stirring conditions at pH 2 and 200 rpm to obtain the first mixed solution;

[0059] (2) 3mol phosphoric acid is dissolved in 1L deionized water to prepare a transparent solution; then 7mol polyvinyl alcohol is dissolved in 1L 80°C deionized water to obtain a mixed solution; then the mixed solution is stirred at 200 rpm , added to the transparent solution to obtain the second mixed solution; wherein, the mass ratio of polyvinyl alcohol to 80°C deionized water is 1:3;

[0060] (3) Under the stirring condition of 200 rpm / min, the second mixed solution is added dropwise to the first mixed solution at a rate of addition of 50 mL / min, and a hydrothermal reaction is carried out in a 5L stainless steel reactor. After completion, cooling, suction filtration and washing are carried out in sequence to obtain spherical ferric phosphate hydrate; wherein, the temperatu...

Embodiment 2

[0065] (1) 1mol ferric sulfate is mixed with sulfuric acid solution, and then 21mol glycerine triamine is added under the stirring condition that pH is 1 and 200 rpm, obtains the first mixed solution;

[0066] (2) 3mol phosphoric acid is dissolved in 1L deionized water to prepare a transparent solution; then 7mol polyvinyl alcohol is dissolved in 1L 80°C deionized water to obtain a mixed solution; then the mixed solution is stirred at 200 rpm , added to the transparent solution to obtain the second mixed solution; wherein, the mass ratio of polyvinyl alcohol to 80°C deionized water is 1:3;

[0067] (3) Under the stirring condition of 200 rpm / min, the second mixed solution is added dropwise to the first mixed solution at a rate of addition of 50 mL / min, and a hydrothermal reaction is carried out in a 5L stainless steel reactor. After completion, cooling, suction filtration and washing are carried out in sequence to obtain spherical ferric phosphate hydrate; wherein, the tempera...

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Abstract

The invention provides a preparation method of iron phosphate, comprising the following steps: mixing iron salt with a polyamino compound under acidic conditions to obtain a first mixed solution; mixing phosphorus source, polyhydric alcohol and water to obtain a second mixed solution solution; mixing the first mixed solution and the second mixed solution, and performing a hydrothermal reaction to obtain hydrated iron phosphate; and calcining the hydrated iron phosphate to obtain iron phosphate. The invention utilizes polyamino compounds to complex iron ions in iron salts, induces the directional growth of iron phosphate into nano-sheet structure primitives, and releases amino groups; uses polyamino compounds to transport iron phosphate nanostructure primitives to combine with polyhydric alcohols to carry out scaffolding bridge, and the iron phosphate with radially ordered porous structure was prepared by hydrothermal method, which significantly increased the infiltration channel of lithium source and reduced the resistance of ions to migrate to the center of the material during the high-temperature solid-phase reaction, thereby improving the lithium iron phosphate. electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and in particular relates to a ferric phosphate and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are a new generation of green high-energy batteries. They have many advantages such as high working voltage, high energy density, good cycle performance, light weight and no pollution. They are widely used in mobile phones, notebook computers, electronic instruments and weaponry. Cathode material is one of the core parts of lithium-ion batteries, and its performance is the key to improving the performance of lithium-ion batteries. At present, lithium cobalt oxide (LiCoO 2 ), lithium manganate (LiMn 2 o 4 ) and lithium iron phosphate (LiFePO 4 ) dominated, in which LiFePO with olivine structure 4 Due to the advantages of low price, abundant raw materials, good thermal stability, excellent cycle performance, non-toxic and ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/37H01M4/58H01M10/0525
CPCC01B25/375C01P2002/72C01P2004/03C01P2004/32C01P2004/61H01M4/5825H01M10/0525Y02E60/10
Inventor 陈晗周伟向楷雄张世英丁建华方蕾蕾
Owner CHANGSHA UNIVERSITY