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Iron phosphate and preparation method thereof

A technology of iron phosphate and iron source, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of high cost of preparation process, poor performance, difficult control of product components, etc., and achieve the effect of ensuring product quality

Inactive Publication Date: 2017-12-29
JIANGXI YUEAN SUPERFINE METAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current preparation process is costly, the product composition is not easy to control, and the performance is not good

Method used

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preparation example Construction

[0014] A preparation method of iron phosphate, comprising the following preparation steps:

[0015] After mixing the iron source, phosphorus source, and complexing agent, add hydrogen peroxide and react at a temperature of 70-100°C for 100-400min. The pH value of the reaction system is 1.2-4, and the mass concentration of hydrogen peroxide is 20-30%. Among them, the reaction The molar ratio of iron element, phosphate, complexing agent and hydrogen peroxide in the system is 1:1-1.6:0.01-0.05:0.5-2.0.

[0016] Iron source, phosphorus source, complexing agent and hydrogen peroxide undergo a complex reaction in a reaction system with a temperature of 70-100°C and a pH value of 1-4 to obtain ferric phosphate seeds. In the process of adding hydrogen peroxide, iron phosphate is gradually formed, and the iron phosphate formed in the later stage grows with iron phosphate seed crystals as the nucleus, and finally forms flaky iron phosphate. Preferably, the hydrogen peroxide is added sl...

Embodiment 1

[0027] A preparation method of iron phosphate, comprising the following preparation steps:

[0028] Mix ferrous acetate, ferrous phosphate, and oxalic acid in a reaction kettle, then slowly add hydrogen peroxide with a mass concentration of 20%, and then add phosphoric acid to adjust the pH value of the reaction system to 2, and then react at a temperature of 80°C for 300 minutes. Wherein, the molar ratio of ferrous ion, phosphate, oxalic acid and hydrogen peroxide in the reaction system is 1:1.2:0.03:0.8. After the reaction is completed, the reaction system is filtered, the filtered product is ultrasonically washed with ethanol to obtain a precipitate, and the precipitate is dried to obtain iron phosphate.

[0029] An iron phosphate is obtained by the above method for preparing iron phosphate, and the obtained iron phosphate is in the form of flakes.

Embodiment 2

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

[0032] Mix ferric acetate, ferrous phosphate, and acetic acid in a reaction kettle, then slowly add hydrogen peroxide with a mass concentration of 25%, and then add phosphoric acid to adjust the pH value of the reaction system to 3, and then react at a temperature of 100°C for 100 minutes. Among them, the iron ions (Fe 2+ ions and Fe 3+ ions), phosphate, acetic acid and hydrogen peroxide in a molar ratio of 1:1:0.02:0.5. After the reaction is completed, the reaction system is filtered, the filtered product is ultrasonically washed with ethanol to obtain a precipitate, and the precipitate is dried to obtain iron phosphate.

[0033] An iron phosphate is obtained by the above method for preparing iron phosphate, and the obtained iron phosphate is in the form of flakes.

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Abstract

The invention provides iron phosphate and a preparation method thereof and relates to the technical field of lithium batteries. The preparation method of iron phosphate comprises the preparation steps of mixing an iron source, a phosphorus source and a complexing agent, and slowly adding hydrogen peroxide to react at 70-100 DEG C for 100-400 minutes, wherein the pH value of a reaction system is 1.2-4, and the mass concentration of hydrogen peroxide is 20%-30%, the molar ratio of iron to phosphorus to the complexing agent to hydrogen peroxide is 1 to (1-1.6) to (0.01-0.05) to (0.5-2.0). The preparation method has the beneficial effects that a process is simple, the cost is low, and iron phosphate with few impurities and good product performance can be prepared. Iron phosphate prepared by virtue of the preparation method is flake-shaped and has the characteristics of few impurities and good product performance.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, and in particular to an iron phosphate and a preparation method thereof. Background technique [0002] Lithium iron phosphate battery refers to a lithium ion battery that uses lithium iron phosphate as the positive electrode material. The P-O bond in lithium iron phosphate crystal is stable and difficult to decompose. Even at high temperature or overcharge, it will not collapse and generate heat or form strong oxidizing substances like lithium cobalt oxide, so it has good safety. Lithium iron phosphate batteries are non-toxic, non-polluting, and very environmentally friendly. In addition, lithium iron phosphate batteries are widely used due to their advantages such as good high temperature performance, large capacity, no memory effect, and light weight. [0003] At present, the positive electrode material of lithium iron phosphate battery is lithium iron phosphate, and iron phosphate ...

Claims

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Application Information

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IPC IPC(8): C01B25/37
CPCC01B25/375C01P2004/61C01P2006/80
Inventor 游坚真李上奎王兵李博邹海平朱敏峰
Owner JIANGXI YUEAN SUPERFINE METAL