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Preparation method of high-temperature-resisting battery diaphragm

A battery separator and high temperature resistance technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of easy generation of closed pores and inability to store lithium ions in electrolyte, and achieve high temperature resistance performance and air permeability. The effect of good air permeability and simple preparation process

Inactive Publication Date: 2013-02-06
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of these methods use the method of adding pore-forming substances to form pores, which are prone to closed pores
Closed cells cannot play the role of storing electrolyte and transporting lithium ions

Method used

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  • Preparation method of high-temperature-resisting battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] First, dissolve 4,4'-diaminodiphenyl ether and pyromellitic dianhydride in the organic solvent N,N'-dimethylacetamide to obtain a polyimide precursor solution; where 4,4' - The molar ratio of diaminodiphenyl ether and pyromellitic dianhydride is 1:1, and the weight of solvent N,N'-dimethylacetamide is 4,4'-diaminodiphenyl ether and pyromellitic acid 12 times the total weight of dianhydride; the temperature of the solution is controlled at 10-30°C during the preparation process.

[0027] Then, use a film applicator to coat the polyimide precursor solution prepared in the above steps on a clean and dry glass substrate with a coating thickness of 300 μm, soak in acetone / water (1:1 volume ratio) for 0.5 minutes, then soak in water for 0.5 minutes.

[0028] Finally, leave the prepared film for 2 minutes, stretch the non-woven fabric with a steel sheet, put it into an oven to heat, first keep it at 90°C for 30 minutes, then raise the temperature to 250°C for 30 minutes, and ...

Embodiment 2

[0030] First, dissolve 4,4'-diaminobiphenyl and 3,3',4,4'-biphenyltetracarboxylic dianhydride in organic solvent N,N'-dimethylacetamide to obtain polyimide Amine precursor solution; the molar ratio of 4,4'-diaminobiphenyl and 3,3',4,4'-biphenyltetracarboxylic dianhydride is 1:1.01, solvent N,N'-dimethyl The weight of acetamide is 15 times of the total weight of 4,4'-diaminobiphenyl and 3,3',4,4'-biphenyltetracarboxylic dianhydride; the temperature of the solution is controlled at 10-30°C during the preparation process .

[0031] Then, use a film applicator to coat the polyimide precursor solution prepared in the above steps on a clean and dry glass plate substrate with a coating thickness of 150 μm, soak in acetone / water (2:1 volume ratio) for 0.8 minutes, followed by soaking in ethanol / water (1:2 volume ratio) for 0.5 minutes.

[0032] Finally, place the prepared film for 4 minutes, put it into an oven to heat, first keep it at 80°C for 60 minutes, then raise the temperatur...

Embodiment 3

[0034] First, dissolve 1,2',3,3'-benzophenone tetracarboxylic dianhydride and 3,3'-dimethyl-4,4'-diaminobenzophenone in organic solvent N,N '-Dimethylacetamide to obtain a polyimide precursor solution; wherein 1,2',3,3'-benzophenone tetracarboxylic dianhydride and 3,3'-dimethyl-4, The molar ratio of 4'-diaminobenzophenone is 1:0.99, the weight of solvent N,N'-dimethylacetamide is 1,2',3,3'-benzophenone tetracarboxylic dianhydride and 10 times the total weight of 3,3'-dimethyl-4,4'-diaminobenzophenone; during the preparation process, the temperature of the solution is controlled at 10-30°C.

[0035]Then, use a film applicator to coat the polyimide precursor solution prepared in the above steps on a clean and dry glass substrate with a coating thickness of 210 μm and soak it in acetone / water (3:1 volume ratio) for 0.8 minutes, then soak in water for 0.5 minutes.

[0036] Finally, place the prepared film for 4 minutes, put it into an oven to heat, first keep it at 90°C for 60 m...

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Abstract

The invention discloses a preparation method of a high-temperature-resisting battery diaphragm. The battery diaphragm is a porous polyimide battery diaphragm. The battery diaphragm disclosed by the invention is prepared by a phase conversion method; the prepared diaphragm has no closed pores and high air permeability; the porosity is 30-60% and the average pore diameter is 0.02-0.15 microns; the diaphragm has low heat shrinkage rate and good heat resistance and is stable at 300 DEG C, and the temperature resistance is far higher than the temperature resistance of the current commercial diaphragm. The polyimide thin film has excellent high-temperature-resisting performance so that the integrity can be kept at a high temperature, the smelting problem of a PE (Poly Ethylene) or PP (Propene Polymer) diaphragm is avoided, and the high-temperature safety performance of a battery is improved.

Description

technical field [0001] The invention belongs to the technical field of battery diaphragms, and in particular relates to a preparation method of a battery diaphragm for a lithium ion battery. Background technique [0002] Due to the advantages of high specific energy, long cycle life and fast charging and discharging, lithium-ion batteries have broad applications in portable electronic equipment, electric vehicles, space technology, defense industry, etc., and will be large tool batteries, The first choice for automotive batteries. [0003] Lithium-ion batteries are composed of electrodes, electrolytes, and polymer separators. Between the positive and negative electrodes of lithium-ion batteries is the separator material, which is one of the key components of lithium-ion batteries. The safety performance of lithium batteries not only depends on the positive and negative electrodes, but the separator also has an important impact on the safety of the battery. The safety of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16
CPCY02E60/12Y02E60/10
Inventor 杨卫国项宏福
Owner JIANGSU UNIV OF SCI & TECH
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