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Preparation process of lithium iron phosphate material

A preparation process, a technology of lithium iron phosphate, applied in the direction of phosphorus compounds, structural parts, inorganic chemistry, etc., can solve the problems of difficult control of product particle size, uneven distribution, irregular morphology, etc., to improve pulping performance, improve Specific capacity, effect of increasing tap density

Active Publication Date: 2016-01-06
KAIFENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particle size of the product is not easy to control, the distribution is uneven, and the shape is irregular.

Method used

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  • Preparation process of lithium iron phosphate material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A preparation process of lithium iron phosphate material, the following steps are carried out:

[0013] Step 1, according to mass percentage, lithium carbonate 20%, ferrous oxalate 40%, diammonium hydrogen phosphate 40%

[0014] Mixing, adding aluminum hydroxide of 0.5-1% of the total mass, putting it into a ball mill tank for ball milling for 9 hours, taking it out and placing it under the protection of argon for sintering for 12 hours, cooling for 7 hours to form a mixture;

[0015] Step 2: add 73 grams of white sugar and 1150 ml of alcohol to 1 kg of the mixture, ball mill for 8.5 hours, send to the workshop for drying, sinter at 720 ° C for 12 hours, cool and pulverize, and pass through a 100-mesh sieve.

Embodiment 2

[0017] The difference from Example 1 lies in that in step 2, pre-pressing is performed on the rollers after drying, and the gap between the rollers is 2 mm, and then sintering is performed.

[0018] According to the analysis of experimental data before and after transformation (100 batteries), this patent can increase the overall tap density by more than 30%, increase the specific surface area by about 30%, and increase the specific capacity at 0.5C by about 30%, which can effectively improve the material performance.

[0019] Some experimental reference data:

[0020] Product element content (%) and tap density

[0021] experiment number T. D (g / cm 3 ) Example 1 1.00 Example 2 1.36

[0022] specific surface area

[0023] Scheme number Example 1 Example 2 specific surface area 14.956 19.410

[0024] Directly sealed battery test results (100 batteries):

[0025]

[0026] In the present invention, adding a small amount...

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Abstract

The invention relates to the lithium ion battery production field of the field of new energy, in particular to a preparation process of a lithium iron phosphate material. The preparation process of the lithium iron phosphate material comprises the following steps that step one, 18-22% by mass of lithium carbonate, 35-45% by mass of ferrous oxalate and 35-45% by mass of diammonium phosphate are mixed and put into a ball milling tank to perform ball milling for 7-11 hours, the materials are taken out and are sintered under the argon protection for 10-14 hours, and cooling is performed for 5-8 hours to form a mixture; step 2, sugar accounting for 6-8% by mass of the mixture and alcohol with the purity of more than 90% and accounting for 85-11% by mass of the mixture are added into the mixture prepared in the step, ball milling is performed for 7-11 hours, sintering is performed at the temperature of 720 DEG C for 10-14 hours after drying, cooling and smashing are performed, and screening is performed by using a 100-mesh screen. The tap density of material products is effectively increased, the pulping performance of the material in preparation of lithium ion batteries is effectively improved, the specific surface area is increased, and the specific capacity of the material is improved.

Description

technical field [0001] The invention relates to the field of lithium ion battery production in the field of new energy, in particular to a preparation process of lithium iron phosphate material. Background technique [0002] At present, the most commonly used conventional process for solid-phase sintering of lithium iron phosphate materials is: mix lithium source materials, iron source materials and C-coated materials in a certain proportion, put them into a ball mill tank for ball milling for several hours, take them out and place them in a protective gas for sintering Cool for a certain period of time, add coated carbon source in a certain proportion, ball mill, sinter at 600-720°C, cool and pulverize. But the particle size of the product is not easy to control, the distribution is not uniform, and the shape is irregular. Contents of the invention [0003] The technical problem to be solved by the present invention is: a preparation process of lithium iron phosphate mat...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/1397C01B25/45H01M10/0525
CPCC01B25/45H01M4/1397H01M4/5825H01M10/0525Y02E60/10
Inventor 刘进
Owner KAIFENG UNIV
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