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A slurry composition and a lithium-ion battery separator comprising the slurry composition

A lithium-ion battery and composition technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of phase separation size and uniformity difference, can not effectively prevent the shrinkage of the base layer, insufficient resistance, etc., to reduce short circuits , The effect of improving heat resistance and improving reliability

Active Publication Date: 2017-11-14
乐凯胶片股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the highly heat-resistant resin coating forms pores through phase separation, the pore size and the degree of phase separation and uniformity vary greatly depending on drying conditions such as humidity and temperature, so there is a limit to the production of separators with excellent quality uniformity
In addition, when a battery abnormality such as an internal short circuit of the battery occurs, it cannot effectively prevent the base layer from shrinking due to a sharp rise in temperature
Due to the excellent heat resistance of the coating, thermal deformation does not occur at the melting temperature of the base layer of 130°C, thereby preventing a part of the base layer from shrinking, but due to the loose network structure of the resin in the coating, it is impossible to completely prevent the base layer from shrinking. Insufficient resistance to shrinkage of the bottom layer, so the slurry composition is not suitable as a coating material to improve the thermal stability of the separator

Method used

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  • A slurry composition and a lithium-ion battery separator comprising the slurry composition

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] 1. Lithium-ion battery separator slurry composition

[0103] (1) Aqueous dispersion of inorganic particles

[0104] Take 1000g Al 2 o 3 Soak in 2500g water, use ball mill to make Al 2 o 3 After refining to small-sized particles with an average particle diameter of 3 μm, add 0.1 g of polyethylene glycol with a number average molecular weight of 200, and stir for 4 hours to obtain Al 2 o 3 water dispersion.

[0105] (2) Water-insoluble organic particles

[0106] 0.09g of polyacrylic acid with a number average molecular weight of 1,000,000 was dissolved in 0.9g DMAc to obtain a polyacrylic acid solution; 0.91g of polyphenylsulfone with a number average molecular weight of 5000 was dissolved in 9.1g of DMAc to obtain a polyphenylsulfone solution; Acrylic acid solution and polyphenylsulfone solution are mixed evenly to form an oil phase; under stirring conditions, 40g of water is quickly added to the above oil phase, after stirring for 20 minutes, DMAc is removed by u...

Embodiment 2

[0113] 1. Lithium-ion battery separator slurry composition

[0114] (1) Aqueous dispersion of inorganic particles

[0115] Take 350g Al 2 o 3 Soak in 500g water, use homogenizer to mix Al 2 o 3 After refining to small-sized particles with an average particle diameter of 0.1 μm, add 5 g of polyvinyl alcohol with a number average molecular weight of 170,000, and stir for 6 hours to obtain Al 2 o 3 water dispersion.

[0116] (2) Water-insoluble organic particles

[0117] 8.33g of polyvinyl alcohol with a number average molecular weight of 170,000 was dissolved in 138.8g of DMAc to obtain a polyvinyl alcohol solution; 1.67g of polyamide with a number average molecular weight of 180,000 was dissolved in 16.7g of DMAc to obtain a polyamide solution; polyethylene The alcohol solution and the polyamide solution are mixed evenly to form an oil phase; under stirring conditions, 400g of water is quickly added to the above oil phase, after stirring for 30 minutes, DMAc is removed b...

Embodiment 3

[0124] 1. Lithium-ion battery separator slurry composition

[0125] (1) Aqueous dispersion of inorganic particles

[0126] Take 400g SiO 2 Soak in 400g of water, use high-speed shearing machine to SiO 2 After refining to small-sized particles with an average particle diameter of 0.4 μm, add 0.5 g of polyacrylic acid with a number average molecular weight of 1000, and stir for 2 hours to obtain SiO 2 water dispersion.

[0127] (2) Water-insoluble organic particles

[0128] The polyacrylic acid that 8.6g number average molecular weight is 2000 is dissolved in 86g DMAc, obtains polyacrylic acid solution; The polyimide that 21.4g number average molecular weight is 50000 is dissolved in 142.7g DMAc, obtains polyimide solution; The polyacrylic acid solution and the polyimide solution were mixed evenly to form an oil phase; under stirring conditions, 500g of water was quickly added to the above oil phase, and after stirring for 60 minutes, DMAc was removed by ultrafiltration, and t...

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Abstract

The present invention relates to a slurry composition and a lithium ion battery separator containing the slurry composition. The slurry composition contains inorganic particles, water-soluble polymers, water-insoluble organic particles and water, wherein the water-soluble polymer serves as The dispersant is evenly adsorbed on the surface of inorganic particles, so that the inorganic particles are evenly and stably dispersed in water to obtain a water dispersion of inorganic particles; water-insoluble organic particles have a core-shell structure, and due to the existence of shell materials, they can be used as core layer materials The non-water-soluble polymer is evenly dispersed in water; the aqueous dispersion of inorganic particles and the non-water-soluble organic particles are evenly mixed. The slurry composition prepared by the present invention is used for lithium ion battery separators, and the separators are modified by coating It improves the heat resistance of the lithium-ion battery separator, reduces short circuits and other safety issues caused by thermal shrinkage of the separator, and significantly improves the reliability of the lithium-ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a slurry composition and a lithium ion battery diaphragm using the slurry composition. Background technique [0002] Lithium-ion batteries are widely used due to their long life and high energy density. Lithium-ion batteries generally have a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte. The diaphragm is an important part of the lithium-ion battery, which plays the role of isolating the positive and negative electrodes and ion conduction, and is generally an extremely thin microporous membrane with a thickness of about 10-50 μm. [0003] From the perspective of the application field of lithium-ion batteries, it is mainly concentrated in the notebook computer and mobile phone market at present. With the gradual popularization of the new generation of 3G mobile communication technology, the Internet, and digital entertainment portable dev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D1/00C09D7/12H01M2/16H01M50/403H01M50/446H01M50/449H01M50/489
CPCY02E60/10
Inventor 赵义丽陈彤红梁丽华桑大力王广伟
Owner 乐凯胶片股份有限公司