Cathode film of lithium iron phosphate polymer lithium ion battery

A lithium-ion battery and lithium iron phosphate technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of small particle size of lithium iron phosphate materials, insufficient toughness of positive electrode slurry, brittleness and easy fracture, etc., to improve processing Difficult problems, easy solvent removal, and low equipment energy consumption

Inactive Publication Date: 2013-01-30
HUBEI WEWIN BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The lithium iron phosphate material has the characteristics of small particle size and large specific surface area. When the positive electrode slurry is coated, the toughness is insufficient, it is brittle and easy to break, and it is easy to roll, which is not convenient Production
[0006] The technical problem to b

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach A

[0021] (1) Powder drying: dry 25.5%wt lithium iron phosphate at 110°C for 4h, 1.9%wt conductive carbon black A, 0.5%wtwt conductive carbon black B at 200°C for 4h, 3%wt PVDF / HFP at 80°C for 4h ;

[0022] (2) Slurry configuration: Dissolve 3%wt PVDF / HFP in 66%wt acetone, and control the stirring temperature at 38°C-42°C. After the PVDF / HFP is completely dissolved and clarified, add 3%wt dibutyl phthalate and stir evenly; then add 0.5%wt conductive carbon black B, 1.9%wt conductive carbon black A, 25.5%wt lithium iron phosphate, Stir evenly, and the solution is prepared. The whole stirring process takes about 12-16h.

[0023] (3) Coating: After the slurry is vacuum defoamed and filtered with 150 mesh, it is evenly coated on the polyester film, and the coating thickness is controlled to be 160um±10um, and the acetone is removed after drying to obtain the lithium iron phosphate positive electrode film;

Embodiment approach B

[0025] (1) Powder drying: Dry 28.5%wt lithium iron phosphate at 110°C for 4h, 1.9%wt conductive carbon black A, 0.6%wtwt conductive carbon black B at 200°C for 4h, 3.7%wt PVDF / HFP at 80°C for 4h ;

[0026] (2) Slurry configuration: Dissolve 3.7%wt PVDF / HFP in 62%wt acetone, and control the stirring temperature at 38°C-42°C. After PVDF / HFP is completely dissolved and clarified, add 3.5%wt dibutyl phthalate and stir evenly; then add 0.6%wt conductive carbon black B, 1.9%wt conductive carbon black A, 28.5%wt lithium iron phosphate, Stir evenly, and the solution is prepared. The whole stirring process takes about 12-16h.

[0027] (3) Coating: After the slurry is vacuum defoamed and filtered with 150 mesh, it is evenly coated on the polyester film, and the coating thickness is controlled to be 160um±10um, and the acetone is removed after drying to obtain the lithium iron phosphate positive electrode film;

[0028] The positive electrode film of the lithium iron phosphate lithium...

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Abstract

The invention relates to a cathode film of a lithium iron phosphate polymer lithium ion battery. Acetone serves as a solvent; a lithium iron phosphate cathode material, a conductive agent, high-branch structure high-porosity carbon black aggregate conductive graphite, low-branch structure low-porosity carbon black aggregate conductive graphite, a plasticizer and polyvinylidene fluoride (PVDF) / hexafluoropropylene (HFP) are uniformly mixed into slurry; the slurry is uniformly coated on a base material of a polyester thin film; and the cathode film of the lithium iron phosphate polymer lithium ion battery is obtained by drying. Compared with the prior art, the cathode film of the lithium iron phosphate polymer lithium ion battery has the advantages that the problem of difficulty in coating of a lithium iron phosphate cathode film to a rolling process section can be thoroughly solved, the conductivity of the cathode film of the lithium iron phosphate polymer lithium ion battery is not influenced, the solid content of cathode slurry can be improved, the using amount of the acetone solvent is decreased, the solvent is easy to remove, the energy consumption of equipment is low, and the process is environment-friendly.

Description

technical field [0001] The invention relates to a positive electrode film of a lithium iron phosphate lithium polymer lithium ion battery. Background technique [0002] Lithium ions have the characteristics of high specific energy, long cycle life, no memory effect, etc., and are environmentally friendly and pollution-free. Therefore, they are widely used in digital products such as mobile phones, notebook computers, and MP3s. At the same time, they are used in electric vehicles, electric bicycles, and national defense equipment. And so the battery has also begun to be applied. [0003] Lithium-ion batteries can be divided into liquid lithium-ion batteries and polymer lithium-ion batteries according to the electrolyte used. Polymer lithium-ion batteries have obvious advantages in the application of power batteries because their electrolytes are in solid or gel state, there is no liquid leakage, the battery shape is highly plastic (can be made into various shapes), and it ha...

Claims

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Application Information

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IPC IPC(8): H01M4/136H01M4/62
CPCY02E60/122Y02E60/10
Inventor 雷如清朱忠洲潘琴华叶超
Owner HUBEI WEWIN BATTERY TECH
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