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Synthetic method of lithium iron phosphate sizing agent

A technology of lithium ferrous phosphate and a synthesis method, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of easy fragmentation, high cost, safety, etc., achieve stable solid content and viscosity, reduce production costs, reduce The effect of manufacturing costs

Inactive Publication Date: 2010-06-16
东莞市金源电池科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The oily formula is very expensive due to the complete use of N-methylpyrrolidone as the solvent of the positive electrode active material
However, the water-based adhesive formula, the slurry prepared by it has poor fluidity, is easy to precipitate and agglomerate, and the environment of the process is relatively high, and the process control is difficult. The lithium iron phosphate positive electrode sheet made of water-based adhesive , when the humidity is lower than 55%, the pole piece is easy to break. If the ambient humidity is increased, it will increase the difficulty of subsequent baking and dehydration of the pole piece. If the water is not completely removed, a large amount of gas will be generated inside the battery, resulting in the battery being scrapped. and safety issues, while the price of water-based negative electrode glue is higher than the cost of glue used in this patent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1, the synthetic method of described lithium iron phosphate slurry, comprises the steps:

[0012] 1), add 10 kilograms of sodium carboxymethyl cellulose in 90 kilograms of water, use sodium carboxymethyl cellulose as the dispersant and thickener of slurry, fully stir the liquid until sodium carboxymethyl cellulose and The water turns into a uniform and transparent colloidal solution;

[0013] 2), adding 0.5% of the total weight of the colloidal solution, that is, 0.5 kg of conductive agent, and stirring evenly;

[0014] 3), then add 50% of the total weight of the slurry obtained in step 2), i.e. 50.25 kg of lithium iron phosphate material, and stir evenly;

[0015] 4), add 20% of the total weight of the slurry obtained in step 3), that is, 30.15 kg of N-methylpyrrolidone (NMP), and stir evenly;

[0016] 5), adding 10% of the total weight of the slurry obtained in step 4), that is, 18.09 kg of styrene-butadiene rubber, and stirring evenly to prepare lithium ...

Embodiment 2

[0017] Embodiment 2, the synthetic method of described lithium iron phosphate slurry, comprises the steps:

[0018] 1), add 5 kilograms of sodium carboxymethyl cellulose in 95 kilograms of water, use sodium carboxymethyl cellulose as the dispersant and thickener of slurry, fully stir the liquid until sodium carboxymethyl cellulose and The water turns into a uniform and transparent colloidal solution;

[0019] 2), adding 5% of the total weight of the colloidal solution, that is, 5 kg of conductive agent, and stirring evenly;

[0020] 3), then add 70% of the total weight of the slurry obtained in step 2), i.e. 73.5 kg of lithium iron phosphate material, and stir evenly;

[0021] 4), adding 10% of the total weight of the slurry obtained in step 3), that is, 17.85 kg of N-methylpyrrolidone (NMP), and stirring evenly;

[0022] 5), adding 5% of the total weight of the slurry obtained in step 4), that is, 9.8175 kg of styrene-butadiene rubber, and stirring evenly to prepare lithium...

Embodiment 3

[0023] Embodiment 3, the synthetic method of described lithium ferrous phosphate slurry, comprises the steps:

[0024] 1), add 0.5 kilogram of sodium carboxymethyl cellulose in 99.5 kilograms of water, use sodium carboxymethyl cellulose as the dispersant and thickener of slurry, fully stir the liquid until sodium carboxymethyl cellulose and The water turns into a uniform and transparent colloidal solution;

[0025] 2), add 10% of the total weight of the colloidal solution, that is, 10 kg of conductive agent, and stir evenly;

[0026] 3), then add 95% of the total weight of the slurry obtained in step 2), i.e. 104.5 kg of lithium iron phosphate material, and stir evenly;

[0027] 4), add 1% of the total weight of the slurry obtained in step 3), that is, 2.145 kg of N-methylpyrrolidone (NMP), and stir evenly;

[0028] 5), adding 1% of the total weight of the slurry obtained in step 4), that is, 2.166 kg of styrene-butadiene rubber, and stirring evenly to prepare lithium iron p...

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Abstract

The invention discloses a synthetic method for lithium iron phosphate sizing agent, including the following steps: 1. putting sodium carboxymethyl cellulose into the water, stirring the liquid fully until sodium carboxymethyl cellulose and water turn into colloidal solution; 2. adding conductive agent and mixing the mixture thoroughly; 3. adding lithium iron phosphate and mixing the mixture evenly; 4. adding N-methylpyrrolidone and stirring the mixture evenly; and 5. adding GR-S and stirring the mixture evenly. The invention is simple in procedure and operation. Sodium carboxymethyl cellulose is used as dispersant and thickening agent, and GR-S is used as caking agent, the sodium carboxymethyl cellulose and the GR-S are both common materials in the chemical industry with wide sources and low price. Lithium iron phosphate sizing agent prepared by the synthetic method of the invention is good in fluidity, stable in solid content and viscosity and suitable for large scale industrial production, thus greatly reducing the production cost of lithium iron phosphate batteries.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method for synthesizing lithium iron phosphate slurry. Background technique [0002] Lithium iron phosphate material is recognized as the most promising cathode material for power lithium-ion batteries in the future. At present, the formula of lithium iron phosphate positive electrode includes oily formula and water-based adhesive formula. The oily formula is very expensive due to the complete use of N-methylpyrrolidone as a solvent for the positive electrode active material. However, the water-based adhesive formula, the slurry prepared by it has poor fluidity, is easy to precipitate and agglomerate, and the environment of the process is relatively high, and the process control is difficult. The lithium iron phosphate positive electrode sheet made of water-based adhesive , when the humidity is lower than 55%, the pole piece is easy to break. If the ambient humidity is incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397H01M4/62
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 王奇志吴治国陈设军杨世权徐多
Owner 东莞市金源电池科技有限公司
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