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Novel ceramic coating polyolefin composite film and preparation method thereof

A technology of ceramic coating and polyolefin, which is applied in the field of preparation of the composite film, can solve problems such as bad gas and side effects of lithium-ion batteries

Active Publication Date: 2014-05-21
河南惠强新能源材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of side effects and bad gas in the existing lithium-ion batteries, the present invention provides a battery with low closed cell temperature, high melting temperature, small thermal shrinkage rate, good liquid absorption and liquid retention properties and low battery life. Novel ceramic-coated polyolefin composite membrane with internal harmful gas activity

Method used

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  • Novel ceramic coating polyolefin composite film and preparation method thereof
  • Novel ceramic coating polyolefin composite film and preparation method thereof
  • Novel ceramic coating polyolefin composite film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] 35 parts by weight of glass powder (average particle size 0.6μm), 55 parts by weight of alumina (average particle size 0.8μm, specific surface area of ​​about 15m 2 / g), 8 parts by weight of styrene-butadiene latex and 120 parts by weight of water were mixed, dispersed for (2-3) hours, and left to stand for defoaming (1-2) hours to obtain a coating liquid.

[0046] Choose 16μm ultra-high molecular weight polyethylene-based membrane (referred to as UHMWPE, the same below), with an average pore size of 40-65nm, a porosity of 40%, an air permeability of 200s / 100ml, 105°C, 1h heat shrinkage in the MD direction of 2.1%, , TD direction is 0.6%, puncture strength is 650g. Use the photosensitizer benzophenone to pretreat the surface of UHMWPE, and irradiate the surface of UHMWPE with ultraviolet rays with a wavelength of 290nm to make the surface cross-linked, and then the benzophenone can also be sublimated and removed without residue.

[0047] The above coating solution was ...

Embodiment 2

[0049] The multilayer composite microporous membrane was prepared according to the method of Example 1, except that it was coated on one surface of the UHMWPE base membrane, that is, the total thickness of the coating was 4 μm.

Embodiment 3

[0051] The multilayer composite microporous membrane was prepared according to the method of Example 1, except that 20 parts by weight of glass powder (average particle size 0.6 μm) was used instead of 35 parts by weight of glass powder (average particle size 0.6 μm), and 70 parts by weight parts of alumina (average particle size 0.8μm, specific surface area about 15m 2 / g) instead of 55 parts by weight of alumina (average particle size 0.8μm, specific surface area about 15m 2 / g).

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Abstract

The invention relates to a novel ceramic coating polyolefin composite film which comprises a polyolefin substrate with micro pores, wherein one side or both sides of the polyolefin substrate is / are compounded with ceramic coating(s); the ceramic coating comprises porous ceramic particles, an inorganic filler and an adhesive. The invention also relates to a method for preparing the novel ceramic coating polyolefin composite film. The method comprises the following steps: a, dissolving the adhesive in a solvent, thereby preparing an adhesive solution; b, adding the porous ceramic particles and the functional inorganic filler into the adhesion solution prepared in the step a, and performing dispersing treatment, thereby preparing coating slurry; and c, coating one or two surfaces of the polyolefin substrate with the coating slurry prepared in the step b, and drying and curing to prepare the product. The novel functional composite film has high liquid absorption and retention performance, has the functions of reducing harmful gases inside a battery, improving the performance of the battery and prolonging the service life of the battery, and has the safety characteristics of low closed pore temperature, high melting temperature and low hot-shrinkage rate.

Description

technical field [0001] The invention relates to a novel ceramic-coated polyolefin composite membrane, and also relates to a preparation method of the composite membrane. Background technique [0002] Lithium-ion secondary batteries are widely used due to their long life and high energy density. The separator is an important part of the lithium-ion battery, which plays the role of isolating the positive and negative electrodes and ion conduction. Most of the separator materials currently on the market are polyolefin materials, mainly including polyethylene and polypropylene. [0003] Due to the difference in thermal properties between polyethylene and polypropylene, the current shutdown temperature (Shut-down temperature) of the separator made of polyethylene is relatively low. When the battery is overloaded, the microporous structure inside the separator is very fast as the temperature rises. It is destroyed and melted closed, blocking the current in time. However, the di...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/403H01M50/417H01M50/434H01M50/451
CPCH01M10/0525H01M50/446H01M50/403Y02E60/10
Inventor 邱钧锋黄美容王松钊吴耀根蔡朝辉廖凯明
Owner 河南惠强新能源材料科技股份有限公司
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