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Composite lithium battery diaphragm and preparation method thereof

A technology of battery diaphragm and composite diaphragm, which is applied to battery components, separators/films/diaphragms/spacers, circuits, etc., which can solve the problem of low liquid absorption rate, poor wettability of electrolyte, and affecting battery cycle performance and other problems, to achieve the effect of improving room temperature conductivity and good cycle performance

Active Publication Date: 2014-12-03
JIANGSU ANREDA NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyolefin separator itself has poor wettability to the electrolyte, and the liquid absorption rate is not high, which affects the cycle performance of the battery.
At present, inorganic substances are usually used for coating modification with polyolefin porous membrane as the substrate, but there have always been problems with its compatibility.

Method used

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  • Composite lithium battery diaphragm and preparation method thereof
  • Composite lithium battery diaphragm and preparation method thereof
  • Composite lithium battery diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of Composite Separator F1:

[0032] ①The chemical synthesis steps of sulfonated polyimide are:

[0033] Add 1.5510 g (5 mmol) of diphenyl ether tetracarboxylic dianhydride and 0.8006 g of 2,2'-bistrifluoromethyl-4,4'-diaminobiphenyl ( 2.5mmol) and 2,2'-disulfonic acid group-4,4'-diaminobiphenyl 0.8609g (2.5mmol), add 30mL m-cresol (m-cresol) solvent and 0.73mL triethylamine (Triethylamine) , and then add 5 drops of isoquinoline (Isoquinoline) as a catalyst, raise the temperature of the reaction system to 120°C for 2h, then raise the temperature to 190°C for 8h, cool to 80°C, pour the polymer solution into 400mL of ethanol, pump The white fibrous precipitate was obtained by filtration, washed twice with ethanol, the precipitate was acidified with dilute sulfuric acid, and dried under vacuum at 100°C to obtain sulfonated polyimide SPI-50.

[0034] ②The preparation method of the composite lithium battery separator is as follows:

[0035] Take 1.0000g polyeth...

Embodiment 2

[0037] Preparation of composite separator F1-II:

[0038] ① "The chemical synthesis steps of sulfonated polyimide are:

[0039] Add 1.8613 g (6 mmol) of diphenyl ether tetracarboxylic dianhydride and 0.9607 g of 2,2'-bistrifluoromethyl-4,4'-diaminobiphenyl ( 3mmol) and 1.0331g (3mmol) of 2,2'-disulfonic acid-4,4'-diaminobiphenyl, add 30mL m-cresol (m-cresol) solvent and 0.75mL triethylamine (Triethylamine), and then Add 6 drops of isoquinoline (Isoquinoline) as a catalyst, raise the temperature of the reaction system to 130°C for 2 hours, then raise the temperature to 200°C for 8 hours, cool to 90°C, pour the polymer solution into 400mL of ethanol, and filter with suction to obtain The white fibrous precipitate was washed twice with ethanol. The precipitate was acidified with dilute sulfuric acid and dried in vacuum at 100°C to obtain the sulfonated polyimide SPI-50-II.

[0040] ②The preparation method of the composite lithium battery separator is as follows:

[0041] Take ...

Embodiment 3

[0043] Preparation of composite separator F1-III:

[0044] ① "The chemical synthesis steps of sulfonated polyimide are:

[0045] Add 1.5510 g (5 mmol) of diphenyl ether tetracarboxylic dianhydride and 0.8006 g of 2,2'-bistrifluoromethyl-4,4'-diaminobiphenyl ( 2.5mmol) and 2,2'-disulfonic acid group-4,4'-diaminobiphenyl 0.8609g (2.5mmol), add 30mL m-cresol (m-cresol) solvent and 0.75mL triethylamine (Triethylamine) , and then add 6 drops of isoquinoline (Isoquinoline) as a catalyst, raise the temperature of the reaction system to 110°C for 2h, then raise the temperature to 190°C for 12h, cool to 70°C, pour the polymer solution into 400mL of ethanol, pump The white fibrous precipitate was obtained by filtration, washed twice with ethanol, the precipitate was acidified with dilute sulfuric acid, and dried under vacuum at 100°C to obtain the sulfonated polyimide SPI-50-III.

[0046] ②The preparation method of the composite lithium battery separator is as follows:

[0047] Take 1....

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Abstract

The invention relates to the technical field of lithium battery diaphragms, and in particular relates to a composite lithium battery diaphragm and a preparation method of the composite lithium battery diaphragm. The composite lithium battery diaphragm comprises a polypropylene base body diaphragm, wherein composite coatings are sprayed on the two surfaces of the polypropylene base body diaphragm, and the composite coating is sol-like mixed solution formed by polymer and sulfonated polyimide, dissolved in solvent proportionally. The preparation method comprises the following steps: firstly, dissolving polymer and sulfonated polyimide in the solvent proportionally to form the sol-like mixed solution; secondly, coating the two surfaces of the polypropylene base body diaphragm by the mixed solution in the step I; and thirdly, drying the polypropylene base body diaphragm coated by the mixed solution in a vacuum drying oven to obtain the polypropylene composite diaphragm finally. The prepared composite diaphragm can improve the room-temperature conductivity, can greatly improve the interfacial property of the anode material and the diaphragm and Li and the diaphragm, and has good cycle performance after being assembled into the battery.

Description

technical field [0001] The invention relates to the technical field of lithium battery separators, in particular to a composite lithium battery separator and a preparation method thereof. Background technique [0002] Batteries power a variety of inventions such as radios, toys, hearing aids and portable devices. A battery is a device that converts chemical energy into electrical energy. Batteries have at least one anode and cathode separated by an electrolyte. The "battery separator" is the physical barrier between the anode and cathode, but must be permeable to electrons and / or ions. In addition, the diaphragm material must also have good chemical stability, electrochemical stability and good mechanical properties, and maintain a high degree of wettability to the electrolyte during repeated charge and discharge. [0003] At present, commercialized lithium battery separators are mainly polyolefin microporous membranes made of polyethylene and polypropylene. According to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16C09D179/08C08G73/10
CPCC08G73/10C09D179/08H01M50/409Y02E60/10
Inventor 史新昆陈文涛金苗张东晖
Owner JIANGSU ANREDA NEW MATERIAL
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