Preparation method of heat-resistant high-breathability composite coated diaphragm

A highly breathable and coating technology, applied in electrical components, structural parts, secondary battery repair/maintenance, etc., can solve problems such as unstable diaphragm size, unbalanced internal resistance, battery disintegration, etc., to suppress adverse side reactions , Increase peel strength and heat resistance, improve cycle performance

Inactive Publication Date: 2022-04-29
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing lithium battery microporous diaphragm base film materials are mainly polyethylene and polypropylene microporous film materials, but their disadvantages are that they are easy to shrink when heated, resulting in instability of the diaphragm size, direct contact between the positive and negative electrodes and short circuit; in addition, closed The hole temperature and membrane rupture temperature are low. When the battery is pierced and other conditions occur, the separator will completely melt, causing the battery to short circuit and high temperature, resulting in battery disintegration and explosion.
In order to solve the problem of heat resistance, people apply ceramic materials on the base film to enhance the thermal shrinkage performance of the diaphragm. Although this method solves the problem of heat resistance, it cannot balance the increase in internal resistance due to the thickness, and cannot meet the requirements Retrograde high power fast charge and discharge problem

Method used

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  • Preparation method of heat-resistant high-breathability composite coated diaphragm
  • Preparation method of heat-resistant high-breathability composite coated diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of MOF coating slurry

[0026] Dissolve 0.88g of copper nitrate trihydrate and 0.4g of isophthalic acid in 150mL of ethanol respectively, mix the two after complete dissolution, stir at room temperature for 30-120min or ultrasonically for 20-50min to obtain a precursor dispersion. The resulting dispersion was washed with ethanol and dried in a vacuum oven at 160 °C for 12 h to obtain the MOF product.

[0027] Add MOF and PVDF into NMP at a mass ratio of 2:1, stir and disperse for 60 minutes to obtain a coating slurry.

[0028] (2) Preparation of hydrotalcite coating slurry

[0029] First, mix 60 parts of ultrapure water and 0.5 parts of dispersant evenly according to the mass ratio, then add 30 parts of magnesium aluminum hydrotalcite, and then add 6 parts of thickener after high-speed stirring and mix evenly; Grinding with a sand mill, finally adding 3 parts of binder and 0.1 part of wetting agent and stirring evenly to obtain a hydrotalcite coating s...

Embodiment 2

[0033] (1) Preparation of MOF coating slurry

[0034] Dissolve 0.88g of copper nitrate trihydrate and 0.4g of isophthalic acid in 150mL of ethanol respectively, mix the two after complete dissolution, stir at room temperature for 30-120min or ultrasonically for 20-50min to obtain a precursor dispersion. The resulting dispersion was washed with ethanol and dried in a vacuum oven at 160 °C for 12 h to obtain the MOF product.

[0035] Add MOF and PVDF to NMP at a mass ratio of 1.5:1, stir and disperse for 60 minutes to obtain a coating slurry.

[0036] (2) Preparation of hydrotalcite coating slurry

[0037] First, mix 60 parts of ultrapure water and 0.5 parts of dispersant evenly according to the mass ratio, then add 30 parts of magnesium aluminum hydrotalcite, and then add 6 parts of thickener after high-speed stirring and mix evenly; Grinding with a sand mill, finally adding 3 parts of binder and 0.1 part of wetting agent and stirring evenly to obtain a hydrotalcite coating s...

Embodiment 3

[0041] (1) Preparation of MOF coating slurry

[0042] Dissolve 0.88g of copper nitrate trihydrate and 0.4g of isophthalic acid in 150mL of ethanol respectively, mix the two after complete dissolution, stir at room temperature for 30-120min or ultrasonically for 20-50min to obtain a precursor dispersion. The resulting dispersion was washed with ethanol and dried in a vacuum oven at 160 °C for 12 h to obtain the MOF product.

[0043] Add MOF and PVDF into NMP at a mass ratio of 3:1, stir and disperse for 60 minutes to obtain a coating slurry.

[0044] (2) Preparation of hydrotalcite coating slurry

[0045] First, mix 60 parts of ultrapure water and 0.5 parts of dispersant evenly according to the mass ratio, then add 40 parts of magnesium aluminum hydrotalcite, and then add 6 parts of thickener after high-speed stirring and mix evenly; Grinding with a sand mill, finally adding 3 parts of binder and 0.1 part of wetting agent and stirring evenly to obtain a hydrotalcite coating s...

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Abstract

The invention discloses a preparation method of a heat-resistant high-permeability composite coated diaphragm, which comprises the following steps: firstly preparing MOF coating slurry and hydrotalcite coating slurry, then roller-coating the hydrotalcite coating slurry on two sides of a base membrane, and drying to obtain a semi-finished product hydrotalcite coating membrane; and with the semi-finished hydrotalcite coating film as a base film, coating two sides of the film with the MOF coating slurry by adopting a mixed coating method, and drying to obtain the heat-resistant high-permeability composite coating diaphragm. The composite coating diaphragm obtained by the method has thermal shrinkage resistance and high air permeability, and the safety performance and the cycle performance of the battery can be effectively improved.

Description

technical field [0001] The invention relates to the field of lithium-ion battery diaphragm preparation, in particular to a preparation method of a heat-resistant and highly breathable composite coated diaphragm. Background technique [0002] Due to the advantages of light weight, small size, no memory effect, and wide temperature range, lithium-ion batteries are substitutes for nickel-cadmium and nickel-hydrogen batteries in mainstream applications, and have great potential in the development direction of energy storage equipment. In the composition of lithium-ion battery materials, the separator is an additional material with the highest technical barriers among lithium-ion battery (lithium battery) materials, and its cost accounts for about 15% to 30% of the lithium battery. After absorbing the electrolyte, the separator can isolate the positive electrode and The negative electrode, which prevents the battery from short-circuiting, while allowing the free conduction of lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/446H01M50/457H01M50/489H01M50/491H01M10/0525H01M10/42
CPCH01M50/403H01M50/446H01M50/457H01M50/489H01M50/491H01M10/0525H01M10/4235H01M50/426H01M50/443H01M50/431Y02E60/10
Inventor 刘美林张立斌沈亚定
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD
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