Battery-grade anhydrous iron phosphate and preparation method thereof

An iron phosphate, battery-grade technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of high cost, difficulty in precise batching, and large pollution, and achieve the effect of cost saving

Active Publication Date: 2012-06-13
HUBEI WANRUN NEW ENERGY TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0030] In order to solve the above-mentioned deficiencies of the existing lithium iron phosphate preparation process using iron phosphate containing crystal water as a raw material, which has high cost, large pollution and difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0051] The concrete steps of the preparation method of above-mentioned battery grade iron phosphate are as follows:

[0052] a. Prepare a mixed aqueous solution of a certain concentration of ferrous salt and phosphoric acid or phosphate;

[0053] b. Prepare a certain concentration of pH regulator solution;

[0054] c. Continuously input the above prepared ferrous salt and phosphoric acid or phosphate mixed aqueous solution and the pH regulator solution into the reactor with stirring respectively, and input them into the reactor with a certain flow rate through the air compressor Air; through a constant temperature water bath, control and adjust the temperature of the reaction liquid in the reactor and keep it constant within the range of 40-98 ° C; constant flow of the mixed aqueous solution of ferrous salt and phosphoric acid or phosphate and air, control and adjust the reaction liquid in the reactor The pH value is 0.5-7.5 and remains constant; after the addition is complet...

Embodiment 1

[0059] Prepare ferrous sulfate and phosphoric acid mixed aqueous solution, wherein ferrous sulfate concentration is 1.5 mol / liter, phosphoric acid concentration is 1.5 mol / liter;

[0060] Preparation concentration is the ammonia solution of 5.0 mol / liter as pH regulator;

[0061] Add 2 liters of deionized water to the reaction kettle with a volume of 7 liters, stir vigorously, and pass constant temperature water into the jacket of the reaction kettle to control the water temperature in the reaction kettle to 70°C;

[0062]Through the air compressor, import air into the reactor as the oxidant with a flow rate of 5 liters / minute;

[0063] Ferrous sulfate and phosphoric acid mixed aqueous solution, ammonia solution are respectively continuously input in the reactor with pump, the flow of controlling ferrous sulfate and phosphoric acid mixed aqueous solution is 20 milliliters / minute, regulates the flow of ammonia solution, controls the flow rate of reaction solution in the reactor...

Embodiment 2

[0071] Prepare ferrous chloride, phosphoric acid, ammonium phosphate mixed aqueous solution, wherein ferrous chloride concentration is 1.0 mol / liter, phosphoric acid concentration is 0.75 mol / liter, ammonium phosphate concentration is 0.25 mol / liter;

[0072] Preparation concentration is the hexamethylenetetramine solution of 1.5 mol / liter as pH regulator;

[0073] Add 1 liter of deionized water to the reactor with a volume of 7 liters in advance, stir vigorously, and pass constant temperature water into the jacket of the reactor, and control the water temperature in the reactor to 95°C;

[0074] Through the air compressor, import air into the reactor as the oxidant with a flow rate of 5 liters / minute;

[0075] With ferrous chloride, phosphoric acid, ammonium phosphate mixed aqueous solution, hexamethylenetetramine solution is continuously input in the reactor respectively with pump, and the flow of controlling ferrous chloride, phosphoric acid, ammonium phosphate mixed aqueou...

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Abstract

The invention relates to a battery grade anhydrous iron phosphate and a preparation method thereof. The battery grade anhydrous iron phosphate is in an orthorhombic type. The preparation method of the battery grade anhydrous iron phosphate is an oxidation precipitation method using air as oxidant and includes steps: adding pH value modifier solution into aqueous solution of mixture of ferrous salt with phosphoric acid or phosphate, feeding air and stirring for reaction to generate a crystalline-state composite containing ammonium, hydroxyl and water of crystallization; and obtaining the battery grade anhydrous iron phosphate after solid-liquid separating, washing, drying and roasting. The battery grade anhydrous iron phosphate is an ideal material for preparation of lithium iron phosphate which is the material of anodes of lithium ion batteries. The preparation method is suitable for large-scale, economical, stable and reliable production of high-quality battery grade anhydrous iron phosphate, and has evident advantages and practical value.

Description

technical field [0001] The invention belongs to the technical field of energy material preparation, and relates to a battery-grade iron phosphate and a preparation method thereof, in particular to an anhydrous battery-grade iron phosphate and a preparation method thereof. ideal precursor. Background technique [0002] Lithium-ion batteries are a new generation of green high-energy batteries, which have many advantages such as high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. They are widely used in mobile phones, notebook computers, and digital cameras. , camcorders, electronic instruments, etc., also have bright application prospects in UPS, electric tools, electric bicycles, electric vehicles, energy storage batteries and other fields. In recent years, the output of lithium-ion batteries has grown rapidly, and the application fields have continued to expand. It has become a high-tech pr...

Claims

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Application Information

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IPC IPC(8): C01B25/37
Inventor 应皆荣刘世琦
Owner HUBEI WANRUN NEW ENERGY TECH DEV
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