Preparation method for polyimide modified composite battery membrane and product prepared therethrough

A polyimide and composite battery technology, which is applied to battery pack parts, circuits, electrical components, etc., can solve the problems of incomplete removal of polyimide layer pore-forming agent and easy peeling off of laminated film, etc., and achieve cost saving , the effect of improving production efficiency

Inactive Publication Date: 2018-06-15
GUILIN ELECTRICAL EQUIP SCI RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the preparation method simply coats the polyolefin on the polyimide film, there is a problem that the polyimide layer pore-forming agent is not completely removed, and the laminated films are easy to fall off.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Weigh 12g of ammonium carbonate with an average particle size of 0.03 microns and disperse it in 270gN,N-dimethylacetamide for later use. Weigh 14.21g of 4,4'-diaminodiphenyl ether (ODA) to dissolve in the above dispersion Then slowly add 15.79g of pyromellitic anhydride (PMDA) to prepare a polyamic acid solution containing a pore-forming agent, the solution viscosity is 50s (at 25℃, 4# viscosity cup test), the thickness is 10 microns, the pore size The 0.3-micron polyethylene non-woven fabric is immersed in the above polyamic acid solution, ultrasonicated for 20 minutes, and then taken out, and the excess solution on both sides is scraped off, so that the thickness of the imidization coating is 5 microns, and then the above film is immersed in the chemical Chemical imidization is carried out in the aminated reagent, and then placed in an oven for 10 minutes at 90°C, 10 minutes at 95°C, 20 minutes at 100°C, and 20 minutes at 120°C to decompose the pore-forming ...

Embodiment 2

[0027] Example 2: Weigh 20.25g of ammonium carbonate with an average particle size of 0.05 microns and disperse it in 255gN,N-dimethylacetamide for use. Weigh 21.54g of 4,4'-diaminodiphenyl ether (ODA) and dissolve in the above In the dispersion, slowly add 23.46g of pyromellitic anhydride (PMDA) to prepare a polyamic acid solution containing a pore-forming agent. The solution viscosity is 63s (at 25°C, 4# viscosity cup test), and the thickness is 15 microns. A polyethylene non-woven fabric with a pore size of 0.5 microns is immersed in the above polyamic acid solution, ultrasonicated for 30 minutes, and then taken out, and the excess solution on both sides is scraped off, so that the thickness of the imidization coating is 7.5 microns, and then the above film is immersed in the chemical Chemical imidization is carried out in the imidizing reagent, and then placed in an oven for 20 minutes at 90°C, 20 minutes at 95°C, 30 minutes at 100°C, and 30 minutes at 120°C to decompose the...

Embodiment 3

[0028] Example 3: Weigh 24.3g of ammonium carbonate with an average particle size of 0.08 microns and disperse it in 246gN,N-dimethylacetamide for use. Weigh 25.57g of 4,4'-diaminodiphenyl ether (ODA) and dissolve it in the above In the dispersion, slowly add 28.43g of pyromellitic anhydride (PMDA) to prepare a polyamic acid solution containing a pore former. The solution viscosity is 68s (at 25°C, 4# viscosity cup test), and the thickness is 20 microns. A polyethylene non-woven fabric with a pore size of 0.5 microns is immersed in the above polyamic acid solution, ultrasonicated for 35 minutes, and then taken out, and the excess solution on both sides is scraped off, so that the thickness of the imidization coating is 7.5 microns, and then the film is immersed in the chemical Chemical imidization is carried out in the imidizing reagent, and then placed in an oven for 30 minutes at 90°C, 30 minutes at 95°C, 30 minutes at 100°C, and 30 minutes at 120°C to decompose the pore-formi...

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PUM

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Abstract

The invention relates to a preparation method for a polyimide modified composite battery membrane and a product prepared therethrough. The preparation method comprises the steps of dispersing a pore-forming agent in a solvent, and adding diamine and dianhydride successively to obtain a polyamic acid solution A containing the pore-forming agent, wherein based on the total mass of polyamic acid, thecontent of the pore-forming agent is 40-55% and the molar ratio of the dianhydride to the diamine is 0.96:1 to 1.02:1, and based on the total mass of the solvent and the polyamic acid, the mass solidcontent of the polyamic acid is 10-40%; dipping a non-woven fabric in the solution A to obtain a polyamic acid composite membrane B containing the non-woven fabric; dipping the composite membrane B in a solidification solution for performing chemical imidization to obtain a polyimide composite membrane C; and placing the polyimide composite membrane C in a drying oven for heating to enable the pore-forming agent to be gasified and decomposed to form pores, thereby obtaining the polyimide modified composite battery membrane. The polyimide modified composite battery membrane does not contain the bonder, so that the problem of easy falling of laminated membranes in the composite membranes prepared by using the bonder is avoided; and excess solvents do not need to be used for removing the pore-forming agent, so that the cost is reduced, and the production efficiency is improved.

Description

Technical field [0001] The invention relates to a lithium battery diaphragm, in particular to a preparation method and a product of a polyimide modified composite battery diaphragm with a simple method and not easy to fall off between laminated films. Background technique [0002] The diaphragm is an important part of the lithium-ion battery. Its function is mainly to isolate the positive and negative electrodes, allowing the ions in the electrolyte to pass between the positive and negative electrodes while restricting the free passage of electrons. In addition, the separator has an important impact on the safety of the battery. In the case of improper use of the battery, when the battery inside or outside is overheated, the traditional polyolefin separator will melt when the battery temperature exceeds 160°C, causing the positive and negative electrodes to contact and short-circuit, causing the battery to catch fire or explode, seriously endangering users Safety of life. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/411
CPCH01M50/403H01M50/411Y02E60/10
Inventor 陈志平黄孙息冯羽风钟立松
Owner GUILIN ELECTRICAL EQUIP SCI RES INST
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