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Method for treating anode material lithium iron phosphate of lithium ion battery

A lithium-ion battery, lithium iron phosphate technology, applied in the direction of battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of reduced cycle life, blockage of lithium ion diffusion channels, etc., reduce iron dissolution and improve shelf life And high temperature performance, the effect of product quality stability

Inactive Publication Date: 2012-07-25
HEBEI LITAO BATTERY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some literature believes that this is because the residual Fe in lithium iron phosphate 2 o 3 Or other highly active iron compounds. During the cycle, the iron ions are continuously electrochemically or chemically dissolved, and the iron ions migrate to the negative electrode, blocking the diffusion channel of lithium ions, resulting in a rapid decline in cycle life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The treatment method of lithium iron phosphate, the cathode material of lithium ion battery, first prepares 100 kilograms of 0.1% ethanol aqueous solution. After preparation, slowly add 10 kg of lithium iron phosphate powder material and stir to form a uniform suspension. Then prepare 50 kg of nitric acid solution with a pH value of 0, and slowly add the nitric acid solution into the lithium iron phosphate suspension under stirring until the pH of the final solution reaches 2.5. After reaching the set pH value, it was stirred for 1 hour, and then the solution was filtered to remove the lithium iron phosphate material therein. Then wash 2 times with 150 kg of distilled water. All the above operating environment temperature and solution temperature are 25°C. Washed lithium iron phosphate material. Dry at 200°C under vacuum to constant weight (completely dry) to obtain the final product.

Embodiment 2

[0026] The processing method of lithium iron phosphate lithium ion battery cathode material, first prepare 1000 kilograms of 3% methyl ethyl ketone aqueous solution. After preparation, slowly add 1000 kg of lithium iron phosphate powder material and stir to form a uniform suspension. Then prepare 4000 kg of nitric acid solution with a pH value of 1, and slowly add the nitric acid solution into the lithium iron phosphate suspension under stirring until the pH of the final solution reaches 1.5. After reaching the set pH value, it was stirred for 3 hours, and then the solution was filtered to remove the lithium iron phosphate material therein. Then wash twice with 20,000 kg of distilled water. All the above operating environment temperature and solution temperature are 15°C. Washed lithium iron phosphate material. Dry to constant weight (completely dry) at 200°C under an argon gas atmosphere to obtain the final product.

Embodiment 3

[0028] The treatment method of lithium iron phosphate, the positive electrode material of lithium ion battery, first prepares 500 kg of 1% methanol aqueous solution. After preparation, slowly add 100 kg of lithium iron phosphate powder material and stir to form a uniform suspension. Prepare 600 kg of oxalic acid solution with a pH value of 0.5, and slowly add the oxalic acid solution into the lithium iron phosphate suspension under stirring until the pH of the final solution reaches 2.0. After reaching the set pH value, it was stirred for 2 hours, and then the solution was filtered to remove the lithium iron phosphate material therein. Then wash 2 times with 1500 kg of distilled water. All the above operating environment temperature and solution temperature are 25°C. Washed lithium iron phosphate material. Dry at 200°C under vacuum to constant weight (completely dry) to obtain the final product.

[0029] The lithium iron phosphate cathode material prepared by the invention...

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Abstract

The invention relates to a method for treating an anode material lithium iron phosphate of a lithium ion battery, which belongs to the technical field of lithium ion batteries. The method for treating the anode material lithium iron phosphate of the lithium ion battery comprises the following treating processes of: 1) performing wetting treatment on the lithium iron phosphate material, namely treating the lithium iron phosphate material by using a wetting agent at the weight percent concentration of 0.1 to 3 percent to form a uniform aqueous suspension; 2) leaching out high-activity iron ionson the surface of the lithium iron phosphate by using acid solution, namely adding the acid solution of which the pH value is between 0 and 1 into the lithium iron phosphate suspension with stirring,wherein the pH value is kept between 1.5 and 2.5, and the stirring makes a system react fully; and 3) performing filtering and drying, namely filtering the solution, washing filtered lithium iron phosphate by using distilled water or purified water, and drying the lithium iron phosphate under a vacuum condition or a protective gas atmosphere to obtain the final lithium iron phosphate material. The method has the advantages of simple process, stable product quality and the like, is convenient to operate, can effectively improve the shelf life and the high-temperature performance of the battery, and can greatly improve the performance of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a treatment method for lithium iron phosphate, a cathode material of lithium ion batteries. Background technique [0002] At present, the lithium iron phosphate material used in lithium-ion batteries has unparalleled safety, ultra-long cycle life, good high-temperature performance and stable discharge platform. It is used in electric vehicles, energy storage batteries and high-rate electric tool batteries. The only candidate cathode material. Lithium iron phosphate materials manufactured by different processes have considerable performance differences. Among them, the self-discharge problem of lithium iron phosphate material is one of the more serious problems. For example, many lithium iron phosphate materials synthesized by solid-state methods have a monthly self-discharge of more than 3%. However, the carbon coating is good, and the monthly self-di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/45
CPCH01M4/5825C01G49/009Y02E60/122C01B25/37H01M4/625C01P2006/40H01M4/366H01M4/1397H01M10/0525Y02E60/10
Inventor 朱杰杜振山
Owner HEBEI LITAO BATTERY MATERIAL