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Diatomaceous earth-coated non-woven fabric lithium ion battery diaphragm and preparation method therefor

A technology for lithium-ion batteries and non-woven separators, which is applied in battery pack components, circuits, electrical components, etc., can solve the problems of low porosity, insufficient liquid absorption, and too small micropore size of the separator, and improve the electrical conductivity. efficiency, low cost of raw materials, and the effect of improving wettability

Active Publication Date: 2018-01-19
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to solve the problems of too small pore size, low porosity, and insufficient liquid absorption of the current coated lithium-ion battery separator, and to construct a uniform macroporous structure on the surface of the separator by using the porous characteristics of diatomite itself. , improve the porosity and liquid absorption of the separator, thereby promoting the cycle stability of the battery during high-current charge and discharge

Method used

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  • Diatomaceous earth-coated non-woven fabric lithium ion battery diaphragm and preparation method therefor

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Experimental program
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Effect test

preparation example Construction

[0023] a. Preparation of coating slurry

[0024] Diatomaceous earth, binder, solvent, modifier, and defoamer are uniformly mixed in a mass ratio of 10-80:75-5:10:2:3, then stirred in a booster mixer for 4-12 hours, and then Ultrasonic treatment in an ultrasonic cleaner for 2-5 hours, and finally the mixed solution is placed under vacuum for 1-2 hours to obtain a diaphragm coating slurry;

[0025] b. Preparation of Diatomaceous Earth Coated Nonwoven Separator

[0026] Soak the non-woven fabric base film in the coating slurry, put it in a vacuum drying oven to maintain a vacuum state for 0.5-3 hours, then scrape off the coating slurry adhered to the surface, and put the impregnated base film into the spin coating In the membrane instrument, adjust the rotation speed to 1000-3000 rpm, add the coating slurry drop by drop, and disperse the slurry evenly on the surface of the base film. Then, the coated base film is cured at a high temperature of 100-140° C. for 1-6 hours. The di...

Embodiment 1

[0028] a. Diatomite raw soil and LA132, distilled water, KH-560, high-carbon alcohol fatty acid ester compound are evenly mixed in a mass ratio of 10:75:10:2:3;

[0029] b. The mixture was stirred for 4 hours in a booster stirrer, ultrasonically treated for 5 hours, and placed under vacuum for 2 hours to prepare a coating slurry;

[0030]c. Soak the PP non-woven fabric base film in the coating slurry for 0.5 hours in a vacuum environment;

[0031] d. Scrape off the coating slurry adhered to the surface of the base film, and put the impregnated base film into the spin coater;

[0032] e. Adjust the rotational speed of the spin coater to 1000 rpm, and drop the slurry onto the surface of the non-woven fabric (on average, add 0.05 mL of slurry to the non-woven fabric per square centimeter);

[0033] f. Curing the coated base film at a temperature of 100° C. for 6 hours;

[0034] g. The diatomaceous earth-coated non-woven lithium-ion battery separator is obtained after being roll...

Embodiment 2

[0036] a. Diatomite raw soil and SBR, distilled water, KH-570, polyoxyethylene polyoxypropylene pentaerythritol ether are evenly mixed in a mass ratio of 30:55:10:2:3;

[0037] b. The mixture was stirred for 12 hours in a booster stirrer, ultrasonically treated for 2 hours, and placed under vacuum for 1 hour to prepare a coating slurry;

[0038] c. Soak the PET non-woven fabric base film in the coating slurry for 2 hours in a vacuum environment;

[0039] d. Scrape off the coating slurry adhered to the surface of the base film, and put the impregnated base film into the spin coater;

[0040] e. Adjust the rotational speed of the spin coater to 2000 rpm, and drop the slurry onto the surface of the non-woven fabric (on average, add 0.1 mL of slurry to the non-woven fabric per square centimeter);

[0041] f. Curing the coated base film at a temperature of 120° C. for 1 hour;

[0042] g. After being rolled by 100 μm width counter rolls, a diatomite-coated non-woven lithium-ion ba...

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Abstract

The invention relates to a diatomaceous earth-coated non-woven fabric lithium ion battery diaphragm and a preparation method therefor, and belongs to the field of a diaphragm material. According to the method, a uniform macroporous structure is established on the surface of a non-woven fabric base film based on the diatomaceous earth porous characteristic, so that porosity of the diaphragm is improved, and electrolyte affinity and electrolyte holding property of the diaphragm can be promoted, and the cycle stability in the high-current charging and discharging process of the lithium ion battery can be improved. The preparation method of the diatomaceous earth-coated non-woven fabric diaphragm mainly comprises the two steps of preparing paste (coating paste) by mixing of diatomaceous earth,a binder, a solvent, a modifier and a defoaming agent, and uniformly coating the two surfaces of the non-woven fabric with the paste. The prepared diatomaceous earth-coated non-woven fabric diaphragmhas relatively high lyophilic property, ventilation, and relatively high porosity, thermal stability and ionic conductivity, and is capable of effectively maintaining the cycle stability in the high-current charging and discharging process of the lithium ion battery; and in addition, the preparation method disclosed in the invention is simple, not high in equipment requirement, relatively low inraw material cost and relatively high in market competitiveness.

Description

Technical field: [0001] The invention belongs to the technical field of lithium-ion battery diaphragms, and relates to a high-temperature-resistant, power-type lithium-ion battery diaphragm suitable for high-current charging and discharging and a preparation method thereof. Background technique: [0002] With the rapid development of power vehicles, batteries will become the core of future development, and the diaphragm as a core component of batteries is ushering in a new round of development peak. The diaphragm used in the power lithium-ion battery is obviously different from the ordinary lithium-ion battery diaphragm. The former provides power for vehicles such as vehicles and needs to provide higher voltage, greater power and more electricity. Therefore, the diaphragm is proposed higher requirements. For example, the power battery separator should have higher heat resistance, greater air permeability, and better safety performance. At present, commercial lithium batter...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M2/18H01M50/403H01M50/44H01M50/463
CPCY02E60/10
Inventor 薛兵刘尧李芳菲徐远俊李冬妮徐航
Owner JILIN UNIV
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