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High-temperature-resistant composite lithium battery diaphragm and preparation method for same

A battery diaphragm and lithium composite technology, which is applied in the field of high temperature resistant composite lithium battery diaphragm and its preparation, can solve the problems of affecting the performance of diaphragm products, peeling off of the surface of polyolefin diaphragm, reducing the wetting ability of diaphragm and electrolyte, etc., so as to improve the safety of use performance, reduce short circuit, and high strength

Inactive Publication Date: 2016-10-12
SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these coated separators also reduce the wetting ability of the separator and the electrolyte; in addition, the inorganic filler powder without surface treatment is easy to agglomerate and fall off from the surface of the polyolefin separator, affecting the performance of the separator product

Method used

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  • High-temperature-resistant composite lithium battery diaphragm and preparation method for same
  • High-temperature-resistant composite lithium battery diaphragm and preparation method for same
  • High-temperature-resistant composite lithium battery diaphragm and preparation method for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] The high-temperature-resistant resin in this embodiment is meta-aromatic polyamide (abbreviated as PMIA), the inorganic particles are made of alumina ceramic powder with a purity greater than 99.99% and a D50 of 0.6 μm, and the solvent is N,N-dimethylacetamide ( DMAc), the poor solvent is tripropylene glycol (TPG), the resin cosolvent is lithium chloride (LiCl), the stabilizer is propylene carbonate, and the binder is homopolyvinylidene fluoride with a molecular weight greater than 600,000.

[0079]The preparation of the coating slurry of the high-temperature-resistant composite lithium battery separator in this example: firstly, tripropylene glycol and alumina ceramic powder are uniformly dispersed at a mass ratio of 3:2, and then added to the In the PMIA glue in the amide, the mass ratio of PMIA and alumina ceramic powder is 1:3, then add an appropriate amount of LiCl, propylene carbonate and homopolyvinylidene fluoride, and mix to obtain a slurry with a viscosity of 1...

Embodiment 2

[0085] The preparation of the coating slurry and the composite battery separator of this example is the same as that of Example 1, and the base film is a single-layer PP film with a thickness of 12 μm prepared by Shenzhen Zhongxing Innovative Materials Technology Co., Ltd.

[0086] After the coating slurry is prepared, the coating slurry is coated on one of the surfaces of the PP film by a gravure roll method. Next, the obtained film is placed in a temperature-humid environment with a temperature of 70° C. and a relative humidity of 80-90%, so that the high-temperature-resistant resin is preliminarily precipitated and cured. Next, the preliminarily precipitated and solidified film was treated with the same coagulation bath, water washing and drying conditions as in Example 1, and finally wound up to obtain the high temperature resistant composite lithium battery separator of this example.

[0087] Afterwards, the composite battery separator prepared in this example was tested ...

Embodiment 3

[0089] The preparation of the coating slurry and the composite battery separator of this example is the same as that of Example 1, and the base film is a single-layer PP film with a thickness of 12 μm prepared by Shenzhen Zhongxing Innovative Materials Technology Co., Ltd.

[0090] After the coating slurry is prepared, the coating slurry is coated on one of the surfaces of the PP film by a gravure roll method. Next, the obtained film was placed in the same temperature and humidity environment as in Example 2 for precipitation and curing. Then, use a 60m air flotation hot air oven to dry at 70°C, and the residual membrane water out of the box is less than 200ppm. The high-temperature-resistant composite lithium battery separator of this embodiment is obtained by winding.

[0091] Afterwards, the composite battery separator prepared in this example was tested and made into a battery for various related tests. The preparation of the battery was the same as in Example 1, and the ...

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Abstract

The invention discloses a high-temperature-resistant composite lithium battery diaphragm and a preparation method for the same. The diaphragm comprises a base membrane and a high-temperature-resistant resin layer with which at least one surface of the base membrane is coated, wherein the base membrane is a thermoplastic resin porous membrane, and the high-temperature-resistant resin layer is a coating containing high-temperature-resistant resin. The diaphragm has stronger strength, the heat resistance of the diaphragm is greatly improved, and when the diaphragm is used, puncturing of the diaphragm by burrs and short-circuit caused by shrinkage of the diaphragm at high temperature can be reduced, and the using safety of the diaphragm can be improved; the composite diaphragm with high wettability is high in liquid absorption rate and liquid retention rate; the composite diaphragm with high anti-oxidation performance can be adapted to various application environments, and the service life of a corresponding battery is also prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high temperature resistant composite lithium battery separator and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used as the main power supply of small digital electronic products such as mobile phones and notebook computers, and their applications in power batteries such as electric vehicles have also been rapidly developed. With the expansion of the application field of lithium-ion batteries, its safety issues have also received more extensive attention. [0003] The battery separator is one of the key factors affecting the safety of lithium-ion batteries. Currently, the most widely used battery separator is polyolefin microporous membrane, but the dimensional stability of polyolefin membrane is poor, and when the battery temperature is higher than 150 ° C, it will produce Severe heat shrinkage will cause the...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/414H01M50/449H01M50/489
CPCH01M10/0525H01M50/403H01M50/411H01M50/449Y02E60/10
Inventor 王会娜李恒张胜刚苏碧海张辉
Owner SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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