Ferric phosphate as well as preparation method and application thereof

A technology of iron phosphate and iron source, applied in chemical instruments and methods, phosphorus compounds, structural parts, etc., can solve the problems of affecting the electrochemical performance of lithium iron phosphate batteries, low density of iron phosphate, and increasing production costs, etc., to achieve inhibition Effects of self-discharge, avoidance of by-product salt, and extended life

Active Publication Date: 2018-10-02
HUNAN YACHENG NEW MATERIAL CO LTD
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  • Description
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Problems solved by technology

[0004] The invention provides a ferric phosphate and its preparation method and application to solve the problem that the ferric phosphate prepared by the existing method has low compactness and

Method used

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  • Ferric phosphate as well as preparation method and application thereof

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preparation example Construction

[0030] refer to figure 1 , the preferred embodiment of the present invention provides a kind of preparation method of ferric phosphate, comprises the following steps:

[0031] A preparation method for iron phosphate, comprising the following steps:

[0032] (1) Mix the iron source and the phosphorus source, heat the reaction to obtain a reaction solution, and control the pH value of the reaction end point to 1.8 to 2.5; the iron source is one or more of iron powder, iron flakes, and iron oxides;

[0033] (2) adding hydrogen peroxide to the reaction solution obtained in step (1), after the reaction was completed, the temperature was raised to 85-98° C. to continue the reaction to obtain ferric phosphate dihydrate;

[0034] (3) Calcining the ferric phosphate dihydrate obtained in step (2) to obtain ferric phosphate.

[0035] The above-mentioned preparation method of iron phosphate directly uses one or more of iron powder, iron flakes, and iron oxides as raw materials. Since th...

Embodiment 1

[0054] The preparation method of ferric phosphate in the present embodiment, comprises the following steps:

[0055] (1) Weigh 1613.5g of 85% phosphoric acid solution in the reactor, add water to adjust its concentration to 3.5mol / L, raise the temperature of the solution to 55°C, slowly add 224g of iron powder into the reactor, at this time the iron The molar ratio of source and phosphorus source is 1:3.5, and then add appropriate amount of water to make the mass percentage of iron 5%, and react for 4 hours under constant stirring to obtain a ferrous dihydrogen phosphate solution with a pH value of 1.8, which is filtered.

[0056] (2) Slowly add 755.5g of hydrogen peroxide with a mass fraction of 27% in the above-mentioned ferrous dihydrogen phosphate solution, under constant stirring, the reaction temperature is controlled at 40°C, and the time for adding the hydrogen peroxide is controlled to be 4h; The ions are slowly oxidized, the number of crystal nuclei is controlled, th...

Embodiment 2

[0060] The preparation method of ferric phosphate in the present embodiment, comprises the following steps:

[0061] (1) In the phosphoric acid mother liquor that obtains in embodiment 1, add the phosphoric acid solution of 230.6g 85% again, solution temperature is raised to 55 ℃, 224g iron powder is slowly added in the reactor, now iron source and phosphorus source The mol ratio is 1: 3, then add appropriate amount of water, make the mass percentage content of iron be 5%, react 4h under constant stirring, add the hydrogen peroxide that the mass percentage of 50g is 27%, hydrogen peroxide oxidizes part of ferrous iron to trivalent iron Valence iron, trivalent iron and a small amount of insoluble iron powder undergo oxidation-reduction reactions, thereby promoting the complete reaction of iron powder and converting it into ferrous dihydrogen phosphate to obtain a ferrous dihydrogen phosphate solution with a pH value of 2.2, which is then filtered.

[0062] (2) Slowly add 755.5 ...

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Abstract

The invention discloses anhydrous ferric phosphate as well as a preparation method and the application thereof. The preparation method comprises the following steps: (1) mixing a ferric source with aphosphorus source, heating to carry out a reaction so as to obtain a reaction liquid, and controlling a pH value of a final reaction point as 1.8-2.5, wherein the ferric source is one or more of ferric powder ferric pieces and a ferric oxide; (2) putting hydrogen peroxide into the reaction liquid obtained in the step (1), after a reaction is completed, heating to 85-98 DEG C, and carrying out a reaction continuously so as to obtain ferric dehydrate phosphate; (3) calcining the ferric dehydrate phosphate obtained in the step (2), namely obtaining ferric phosphate. The invention provides an anhydrous ferric phosphate preparation method which is high in purity, free of waste water emission and simple in process. By adopting the prepared anhydrous ferric phosphate as a precursor for synthesizing high vibration compacting spherical lithium iron phosphate, demands of high compacting densities and electrochemical properties can be met.

Description

technical field [0001] The invention relates to the technical field of lithium battery raw materials, in particular to an iron phosphate and its preparation method and application. Background technique [0002] In recent years, lithium iron phosphate batteries have been widely used in UPS, electric tools, electric bicycles, electric vehicles, energy storage batteries and other fields, especially in the field of electric vehicles. After the adjustment of the national policy, higher requirements are put forward for the energy density of the battery, and the high compacted density (>2.4g / cm 3 ) lithium iron phosphate has become the current basic indicator of lithium iron phosphate, and there will be higher demand in the future. The morphology, particle size distribution, particle density, tap density and other factors of iron phosphate in lithium iron phosphate are important factors restricting the high compaction density of lithium iron phosphate. [0003] At present, the...

Claims

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Application Information

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IPC IPC(8): C01B25/37C01B25/45H01M4/58
CPCC01B25/375C01B25/45C01P2006/11H01M4/5825Y02E60/10
Inventor 王振中
Owner HUNAN YACHENG NEW MATERIAL CO LTD
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