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Method for preparing ferrous lithium phosphate

A lithium iron phosphate, lithium source technology, applied in chemical instruments and methods, phosphorus compounds, structural parts, etc., can solve the problems of high cost of raw materials, complicated processes, etc., and achieve a simple preparation process, easy doping, and easy operation. Effect

Inactive Publication Date: 2006-05-24
CHONGQING TERUI BATTERY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the shortcomings of high raw material cost and complex process in the existing production method, the purpose of the present invention is to provide a lithium iron phosphate (LiFePO 4 ) preparation method

Method used

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  • Method for preparing ferrous lithium phosphate
  • Method for preparing ferrous lithium phosphate
  • Method for preparing ferrous lithium phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: 0.05mol lithium carbonate, 0.05mol ferric oxide, and 0.1mol ammonium dihydrogen phosphate are mixed (the required weight can be calculated by the number of moles × molecular weight), and 1.25 grams of nylon-66 is added, and 15ml of nylon-66 is used Glacial acetic acid was added after heating to dissolve. Then add 10ml of absolute ethanol, ball mill the sample on a ball mill at a speed of 300 / min for 8 hours, and dry to obtain the sample. Under sealed conditions, the sample was quickly heated to 650 °C for 8 hours at a constant temperature for 30-60 minutes, and then naturally cooled to room temperature. The prepared LiFePO 4 Grind into powder in a ball mill. The obtained products were analyzed by X-ray diffraction, showing that they were all olivine-type LiFePO 4 , the crystal structure is complete.

[0019] The average particle size of the powder is 1-3 μm after particle size analysis. The obtained product was assembled into an experimental battery, mixe...

Embodiment 2

[0020] Example 2: Mix 0.15mol lithium nitrate, 0.05mol ferric oxide, 0.15mol ammonium dihydrogen phosphate and 4.00 grams of lactose, add 30ml of 95% ethanol, ball mill for 2 hours at a speed of 300 / min on a ball mill, and dry to obtain a sample . Under sealed conditions, the sample was quickly heated to 650 ° C for 6 hours at a constant temperature for 30-60 minutes, and then naturally cooled to room temperature. The prepared LiFePO 4 Grind into powder in a ball mill. The obtained products were analyzed by X-ray diffraction, showing that they were all olivine-type LiFePO 4 , the crystal structure is complete.

[0021] The average particle size of the powder is 1-3 μm after particle size analysis. The resulting product was assembled into an experimental battery, as in Example 1. Use a constant current discharge meter to measure the charge and discharge specific capacity at 0.3mA / cm 2 Constant current discharge, the first discharge specific capacity is 150mAh / g.

Embodiment 3

[0022] Embodiment 3: with 0.05mol lithium carbonate, 0.05mol ferric oxide, 0.1mol ammonium dihydrogen phosphate, 3.00 gram lactose, add 1% Dy by the weight ratio of iron 2 o 3 Mix, add 20ml of absolute ethanol, ball mill on a ball mill at a speed of 300 / min for 4 hours, and dry to obtain a sample. Under sealed conditions, the sample was quickly heated to 650 °C for 12 hours at a constant temperature for 30-60 minutes, and then naturally cooled to room temperature. The prepared LiFePO 4 Pulverize into powder in a ball mill.

[0023] The resulting products were analyzed by X-ray diffraction, showing that they were all olivine LiFePO 4 , the crystal structure is complete. The average particle size of the powder is 1-3 μm after particle size analysis. The resulting product was assembled into an experimental battery, as in Example 1. Use a constant current discharge meter to measure the charge and discharge specific capacity at 0.3mA / cm 2 Constant current discharge, the first...

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Abstract

The invention discloses a method for preparing anode material lithium iron phosphate (LiFePO4) of an Li-ion battery by solid phase reduction, mixing Li-containing compound, trivalent iron compound, phosphorous compound and organic additive, adding in a proper amount of organic solvent, ball-milling them 1-8 hours in a ball mill, and drying the sample at 100-120 deg.C; on condition of sealing without protective gas, baking at constant temperature 500-800 deg.C for 4-24 hours, then naturally cooling, and ball-milling the made LiFePO4 solid in a ball mill into powder. The invention adopts trivalent iron source, reducing material cost; in the course of preparing, does not use protective gas. The invention simplifies the synthesis process and makes LiFePO4 easy to industrialized production.

Description

technical field [0001] The invention belongs to a preparation method of lithium-ion battery cathode material, in particular to a method for directly preparing lithium-ion battery cathode material lithium ferrous phosphate (LiFePO 4 ) synthesis method. Background technique [0002] The performance of the battery is closely related to the performance of the electrode material, and the progress of the battery depends to a large extent on the progress of the battery material. Compared with negative electrode materials, the positive electrode materials of lithium-ion secondary batteries have relatively lower energy density and higher cost. The new lithium-ion battery cathode material can greatly improve the energy density of the entire battery and reduce the cost. In 1997, the Goodenoungh research team discovered that the olivine structure lithium iron phosphate (LiFePO 4 ) can be used as a cathode material for a lithium-ion secondary battery. The material has a high theoreti...

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/10
Inventor 朱伟田强
Owner CHONGQING TERUI BATTERY MATERIAL
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