Porous inorganic coating/polyolefin microporous membrane compound diaphragm and preparation method thereof

A technology of polyolefin microporous membrane and inorganic coating, which is applied in the direction of coating, structural parts, battery pack components, etc. It can solve the problems of poor bonding force of the base film, affect the performance of lithium batteries, and easy to drop powder, etc., and achieve the appearance Dimensional stability, improved battery safety, and improved thermal stability at high temperatures

Inactive Publication Date: 2013-03-20
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, using sol-gel technology, using tetraethoxysilane as a raw material, hydrolyzing with HCl aqueous solution, the inorganic coating coated on the surface of polyolefin has poor bonding force with the base film, and it is easy to drop powder during use, which affects lithium. battery performance

Method used

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  • Porous inorganic coating/polyolefin microporous membrane compound diaphragm and preparation method thereof
  • Porous inorganic coating/polyolefin microporous membrane compound diaphragm and preparation method thereof
  • Porous inorganic coating/polyolefin microporous membrane compound diaphragm and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0063] A polyethylene diaphragm with a thickness of 18 μm, a width of 300 mm, and a porosity of 45% produced by thermally induced phase separation technology (wet process) is selected as the base film; the coating with a water-based adhesive formula is used for coating; when coating, 200 Purpose For gravure roller printing, the ratio of coating speed to gravure roller (speed ratio) is 1:1; after the coating is coated, the diaphragm is cured in a drying oven with a total length of 12 meters, and the curing temperature is controlled at 60°C;

[0064] The processing speed of the atmospheric pressure glow discharge low temperature plasma surface treatment device is synchronized with the paint coating speed, which is 2m / min. Plasma surface treatment power 50W;

[0065] The surface SEM morphology of the obtained porous inorganic coating / polyolefin microporous membrane composite membrane is shown in Figures 2(a) and 2(b), and the cross-sectional SEM morphology is shown in Figure 2(a)...

Embodiment 2

[0067] A polyethylene diaphragm with a thickness of 18 μm, a width of 300 mm, and a porosity of 45% is used as the base film; a coating with a water-based adhesive formula is selected for coating; when coating, a 200-mesh gravure roll is used, and the coating speed is the same as that of the gravure roll. The speed ratio (speed ratio) is 1:1; after the coating is coated, the diaphragm is cured in a drying oven with a total length of 12 meters, and the curing temperature is controlled at 60°C;

[0068] The processing speed of the atmospheric pressure glow discharge low temperature plasma surface treatment device is synchronized with the paint coating speed, which is 2m / min. Plasma surface treatment power 100W. The properties of the obtained composite separator of porous inorganic coating / polyolefin microporous separator are listed in Table 1.

Embodiment 3

[0070] A polyethylene diaphragm with a thickness of 18 μm, a width of 300 mm, and a porosity of 45% is used as the base film; a coating with a water-based adhesive formula is selected for coating; when coating, a 200-mesh gravure roll is used, and the coating speed is the same as that of the gravure roll. The speed ratio (speed ratio) is 1:1; after the coating is coated, the diaphragm is cured in a drying oven with a total length of 12 meters, and the curing temperature is controlled at 60°C;

[0071] The processing speed of the atmospheric pressure glow discharge low temperature plasma surface treatment device is synchronized with the paint coating speed, which is 2m / min. Plasma surface treatment power 200W. The properties of the obtained composite separator of porous inorganic coating / polyolefin microporous separator are listed in Table 1.

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Abstract

The invention relates to a porous inorganic coating/polyolefin microporous membrane compound diaphragm and a preparation method thereof. The preparation method provided by the invention comprises the following steps of: carrying out plasma surface pre-treatment on a polyolefin microporous membrane, so that multiple polar groups are connected to the surface of the polyolefin microporous membrane; coating the polyolefin microporous membrane subjected to the plasma surface pre-treatment by adopting an inorganic coating masking liquid to form a porous inorganic coating; and curing the inorganic coating. The compound diaphragm provided by the invention still has the characteristics and thermal closing function of a lithium ion transport channel as well as basic performances such as air permeability, ionic conductivity, acupuncture strength and tensile strength required by a lithium ion battery diaphragm, and high temperature thermal stability of the compound diaphragm is obviously improved.

Description

technical field [0001] The invention relates to a lithium-ion battery porous inorganic coating / polyolefin microporous membrane composite membrane and a preparation method thereof, belonging to the technical field of lithium-ion battery manufacturing. Background technique [0002] Lithium-ion battery has become a hot spot in the research of new power supply technology due to its advantages of high voltage, high specific energy, high specific power, long cycle life, no pollution and low self-discharge rate, and has developed rapidly in recent years. [0003] In a lithium-ion battery, the separator is located between the positive electrode material and the negative electrode material. It provides a transport channel for lithium ions and also acts as a physical insulating electrode material. Its performance is closely related to the safety of lithium-ion batteries. [0004] At present, commercial lithium-ion battery separators mainly use polyolefin materials, including polyethyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C08J7/00C08L23/00C08L23/06C08L23/12H01M2/16
CPCY02E60/12Y02E60/10
Inventor 乐军张筱薇盛晓晨
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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