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Preparation method and product of ferric phosphate

A technology of iron phosphate and phosphoric acid, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of high production cost, high acid ion content, complex process, etc., and achieve low production cost, cost saving, Equipment simple effect

Inactive Publication Date: 2011-06-22
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the deficiencies such as complex technological process, high production cost, high content of acid radical ions in the product, difficult control of components, and difficulty in meeting battery-level applications in the production of iron phosphate by the existing process. The present invention provides a low production cost, fast and simple, and Preparation method of iron phosphate whose product quality can meet the demand of battery cathode material

Method used

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  • Preparation method and product of ferric phosphate
  • Preparation method and product of ferric phosphate

Examples

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Effect test

Embodiment 1

[0027] 1. Ferrous oxalate (FeC 2 o 4 2H 2 O) 180g was dissolved in 1.5 L of deionized water to make a slurry. After adding 85% phosphoric acid (concentrated phosphoric acid) according to the stoichiometric ratio of 1:1, stir for 30 minutes to make it evenly mixed.

[0028] 2. Add 10% excess hydrogen peroxide solution (concentration: 30%) according to the stoichiometric ratio to the above-mentioned homogeneously mixed slurry, control the adding speed, so as to prevent the solution from splashing out of the beaker during the reaction, and stir with a magnetic stirrer at the same time, Continue to stir for 60 minutes after the addition of hydrogen peroxide is complete, until the ferrous iron is completely converted to ferric iron, and the slurry becomes a clear solution.

[0029] 3. Vacuum filter the above solution to obtain the filtrate. At room temperature (20°C), stir the solution with a magnetic force, and at the same time slowly add 0.1 mol / L ammonia water to the soluti...

Embodiment 2

[0033] 1. Ferrous oxalate (FeC 2 o 4 2H 2 (0) 360g was dissolved in 0.54 L of deionized water to make slurry, according to the stoichiometric 1:1. After adding 85% phosphoric acid, stirred for 60 minutes to make it evenly mixed;

[0034] 2. According to the operation method described in Example 1, an excess of 20% hydrogen peroxide solution (concentration 30%) was added to the uniformly mixed slurry, and stirring was continued for 30 minutes after the hydrogen peroxide was added until the ferrous iron was completely converted into trivalent iron. Valence iron until the slurry turns into a clear solution.

[0035] 3. After the above solution was vacuum filtered to obtain the filtered solution, the solution was heated to 80°C, stirred with a magnetic stirrer, and at the same time, 0.5 mol / L ammonia water was slowly added to the solution, and the ammonia water addition rate was controlled to be 5ml / min. until the pH of the solution was adjusted to 2.0.

[0036] 4. After a...

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Abstract

The invention relates to a novel preparation method and a product of ferric phosphate, in particular to a preparation method and a product of ferric phosphate in the application field of positive electrode materials of batteries, aiming at overcoming the defects of low product purity, high production cost, poor property, and the like which are caused in such a way that acid radical ions, sodium ions and potassium ions are easy to introduce in the prior art. The preparation method comprises the following steps of: regulating the pH of a solution with ammonia water by taking ferrous oxalate and phosphoric acid as raw materials and hydrogen peroxide as an oxidizing agent; reacting at 20-80 DEG C for 30-240 minutes; filtering, washing and drying to obtain a battery-grade ferric phosphate dihydrate product; and then calcining at 500-800 DEG C for 30-240 minutes to obtain anhydrous crystalline ferric phosphate.

Description

technical field [0001] The invention relates to a novel preparation method and product of iron phosphate, in particular to the preparation method and product of iron phosphate in the application field of battery cathode materials, and belongs to the technical field of chemical industry. Background technique [0002] Iron phosphate is also called iron orthophosphate, including iron phosphate dihydrate (FePO 4 .2H 2 O) and anhydrous iron phosphate (FePO 4 ), the initial research on iron phosphate compounds was mainly in the fields of agriculture, ceramic glass, steel and surface passivation. Iron phosphate was later found to have unique catalytic properties, ion exchange capacity, and electrical properties. [0003] Iron phosphate itself can be used as a battery positive electrode material, and can also be used as a good raw material for the preparation of lithium iron phosphate battery materials. In order to meet a large number of battery-grade iron phosphate needs, so far...

Claims

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Application Information

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IPC IPC(8): C01B25/37
Inventor 张云王新鑫
Owner SICHUAN UNIV
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