A high temperature resistant water-based aramid fiber coated lithium-ion battery separator and preparation method thereof

Abstract

The invention relates to a high-temperature-resistant water-based aramid coating lithium ion battery diaphragm, and belongs to the technical field of a battery diaphragm. The high-temperature-resistant water-based aramid coating lithium ion battery diaphragm comprises a base diaphragm, wherein coating slurry is attached onto the diaphragm surfaces of one side or two sides of the base diaphragm; the coating slurry is prepared from the following ingredients in percentage by mass: 5 to 25 percent of nanometer aramid fiber powder, 3 to 10 percent of acrylic adhesives, 1 to 5 percent of fluorocarbon surfactants and cellulose ether type dispersing agents, 0.02 to 0.05 percent of agaroidin, 0.03 to 0.1 percent of dibutyl phthalate, 0.03 to 0.1 percent of trimethylolpropane tripropionate and the balance deionized water. The invention also provides a preparation method of the high-temperature-resistant water-based aramid coating lithium ion battery diaphragm. The high-temperature-resistant water-based aramid coating lithium ion battery diaphragm has high safety of ceramic coating diaphragm on the battery and also achieves the high-temperature resistant performance; the shrinkage rate of the diaphragm under the high-temperature condition is reduced; the whole service life of the battery is prolonged. The preparation method provides a mature efficient process for the preparation of the high-temperature-resistant water-based aramid coating lithium ion battery diaphragm.

Description

technical field

[0001] The invention belongs to the technical field of battery separators, and relates to battery separators of lithium-ion batteries, in particular to a high-temperature-resistant water-based aramid fiber-coated lithium-ion battery separator and a preparation method thereof. Background technique

[0002] The basic role of the battery separator in a lithium battery is to separate the positive and negative electrodes, and to absorb the electrolyte to allow lithium ions to pass through. 3C products include computers (Computer), communications (Communication) and consumer electronics (ConsumerElectronics), which are the main fields of lithium battery application. For lithium batteries of 3C products, only PP separator and PE separator are used, and its performance can be obtained. nice to meet. However, with the continuous development of electric vehicles, the performance of lithium batteries must be further improved to meet the requirements of electric vehicle...

Examples

Embodiment 1

[0030] A high-temperature-resistant water-based aramid-coated lithium-ion battery diaphragm, comprising a base film with coating slurry adhered to one or both sides of the film surface, the base film is a PP diaphragm, and the coating slurry is calculated by mass percentage, Including nano aramid powder 5%, acrylic adhesive 3%, fluorocarbon surfactant and cellulose ether dispersant 1%, agarin 0.02%, phthalate diester 0.03%, trimethylolpropane Triacrylate 0.03%, the balance is deionized water.

[0031]The above-mentioned high-temperature-resistant water-based aramid-coated lithium-ion battery separator is prepared by the following method, using a vertical double-sided coating machine or a horizontal high-speed coating machine, and the coating device includes a base film unwinding shaft 1 and a rubber coating roller arranged in sequence 2. The heating and drying mechanism and the reel 8, the base film is wound on the base film unwinding reel 1, one end of the base film protrudes...

Embodiment 2

[0037] A high-temperature-resistant water-based aramid-coated lithium-ion battery separator, comprising a base film with a coating slurry adhered to one or both sides of the film surface, the base film is a fiber separator, and the coating slurry is calculated by mass percentage. Including nano aramid powder 20%, acrylic adhesive 7%, fluorocarbon surfactant and cellulose ether dispersant 4%, agarin 0.02%, phthalate diester 0.07%, trimethylolpropane Triacrylate 0.08%, the balance is deionized water.

[0038] The above-mentioned high-temperature-resistant water-based aramid-coated lithium-ion battery separator is prepared by the following method, using a vertical double-sided coating machine or a horizontal high-speed coating machine, and the coating device includes a base film unwinding shaft 1 and a rubber coating roller arranged in sequence 2. The heating and drying mechanism and the reel 8, the base film is wound on the base film unwinding reel 1, one end of the base film pr...

Embodiment 3

[0044] A high-temperature-resistant water-based aramid-coated lithium-ion battery diaphragm, comprising a base film with coating slurry adhered to one or both sides of the film surface, the base film is a non-woven diaphragm, and the coating slurry is based on mass percentage Total, including 10% nano aramid powder, 9% acrylic adhesive, 2% fluorocarbon surfactant and cellulose ether dispersant, 0.03% agarin, 0.1% phthalate diester, trimethylol propane triacrylate 0.1%, the balance is deionized water.

[0045] The above-mentioned high-temperature-resistant water-based aramid-coated lithium-ion battery separator is prepared by the following method, using a vertical double-sided coating machine or a horizontal high-speed coating machine, and the coating device includes a base film unwinding shaft 1 and a rubber coating roller arranged in sequence 2. The heating and drying mechanism and the reel 8, the base film is wound on the base film unwinding reel 1, one end of the base film ...

technical field

[0001] The invention belongs to the technical field of battery separators, and relates to battery separators of lithium-ion batteries, in particular to a high-temperature-resistant water-based aramid fiber-coated lithium-ion battery separator and a preparation method thereof. Background technique

[0002] The basic role of the battery separator in a lithium battery is to separate the positive and negative electrodes, and to absorb the electrolyte to allow lithium ions to pass through. 3C products include computers (Computer), communications (Communication) and consumer electronics (ConsumerElectronics), which are the main fields of lithium battery application. For lithium batteries of 3C products, only PP separator and PE separator are used, and its performance can be obtained. nice to meet. However, with the continuous development of electric vehicles, the performance of lithium batteries must be further improved to meet the requirements of electric vehicle...

Examples

Embodiment 1

[0030] A high-temperature-resistant water-based aramid-coated lithium-ion battery diaphragm, comprising a base film with coating slurry adhered to one or both sides of the film surface, the base film is a PP diaphragm, and the coating slurry is calculated by mass percentage, Including nano aramid powder 5%, acrylic adhesive 3%, fluorocarbon surfactant and cellulose ether dispersant 1%, agarin 0.02%, phthalate diester 0.03%, trimethylolpropane Triacrylate 0.03%, the balance is deionized water.

[0031]The above-mentioned high-temperature-resistant water-based aramid-coated lithium-ion battery separator is prepared by the following method, using a vertical double-sided coating machine or a horizontal high-speed coating machine, and the coating device includes a base film unwinding shaft 1 and a rubber coating roller arranged in sequence 2. The heating and drying mechanism and the reel 8, the base film is wound on the base film unwinding reel 1, one end of the base film protrudes...

Embodiment 2

[0037] A high-temperature-resistant water-based aramid-coated lithium-ion battery separator, comprising a base film with a coating slurry adhered to one or both sides of the film surface, the base film is a fiber separator, and the coating slurry is calculated by mass percentage. Including nano aramid powder 20%, acrylic adhesive 7%, fluorocarbon surfactant and cellulose ether dispersant 4%, agarin 0.02%, phthalate diester 0.07%, trimethylolpropane Triacrylate 0.08%, the balance is deionized water.

[0038] The above-mentioned high-temperature-resistant water-based aramid-coated lithium-ion battery separator is prepared by the following method, using a vertical double-sided coating machine or a horizontal high-speed coating machine, and the coating device includes a base film unwinding shaft 1 and a rubber coating roller arranged in sequence 2. The heating and drying mechanism and the reel 8, the base film is wound on the base film unwinding reel 1, one end of the base film pr...

Embodiment 3

[0044] A high-temperature-resistant water-based aramid-coated lithium-ion battery diaphragm, comprising a base film with coating slurry adhered to one or both sides of the film surface, the base film is a non-woven diaphragm, and the coating slurry is based on mass percentage Total, including 10% nano aramid powder, 9% acrylic adhesive, 2% fluorocarbon surfactant and cellulose ether dispersant, 0.03% agarin, 0.1% phthalate diester, trimethylol propane triacrylate 0.1%, the balance is deionized water.

[0045] The above-mentioned high-temperature-resistant water-based aramid-coated lithium-ion battery separator is prepared by the following method, using a vertical double-sided coating machine or a horizontal high-speed coating machine, and the coating device includes a base film unwinding shaft 1 and a rubber coating roller arranged in sequence 2. The heating and drying mechanism and the reel 8, the base film is wound on the base film unwinding reel 1, one end of the base film ...

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