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Slurry composition and lithium ion battery diaphragm containing same

A lithium-ion battery and composition technology, applied to battery components, circuits, electrical components, etc., can solve the problems of phase separation size and uniformity differences, can not effectively prevent the shrinkage of the base layer, insufficient resistance, etc., to reduce short circuits , Improve heat resistance and improve reliability

Active Publication Date: 2016-01-27
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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  • Slurry composition and lithium ion battery diaphragm containing same

Examples

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 1000gAl 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 of 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; the polyacrylic acid solution Mix evenly with polyphenylsulfone solution to form an oil phase; under stirring conditions, quickly add 40g of water to the above oil phase, stir for 20 minutes, remove DMAc by ultrafiltration...

Embodiment 2

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

[0114] (1) Aqueous dispersion of inorganic particles

[0115] Take 350gAl 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; the polyvinyl alcohol Mix the solution and the polyamide solution evenly to form an oil phase; under stirring conditions, quickly add 400g of water to the above oil phase, stir for 30 minutes, remove DMAc by ultrafiltration, contin...

Embodiment 3

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

[0125] (1) Aqueous dispersion of inorganic particles

[0126] Take 400gSiO2 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] 8.6g of polyacrylic acid with a number average molecular weight of 2000 was dissolved in 86gDMAc to obtain a polyacrylic acid solution; 21.4g of a polyimide with a number average molecular weight of 50000 was dissolved in 142.7g of DMAc to obtain a polyimide solution; the polyacrylic acid Mix the solution with the polyimide solution evenly to form an oil phase; under stirring conditions, quickly add 500g of water to the above oil phase, stir for 60min, remove DMAc by ultrafiltration, and continue to concent...

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Abstract

The invention relates to a slurry composition and a lithium ion battery diaphragm containing the same. The slurry composition contains inorganic micro-particles, a water soluble polymer, non-water soluble organic micro-particles and water, wherein the water soluble polymer is used as a dispersant and is uniformly adsorbed on the surface of the inorganic micro-particles, so that the inorganic micro-particles are uniformly and stably dispersed in water, and an aqueous dispersion liquid of the inorganic micro-particles is obtained; the non-water soluble organic micro-particles have a core-shell structure, and the non-water soluble polymer as a core-layer material is uniformly dispersed in water due to the presence of a shell-layer material; the aqueous dispersion liquid of the inorganic micro-particles and the non-water soluble organic micro-particles are mixed uniformly, and the prepared slurry composition is used in the lithium ion battery diaphragm; through coating modification of the diaphragm, the heat resistant performance of the lithium ion battery diaphragm is improved, safety problems such as short circuit caused by thermal contraction of the diaphragm are reduced, and the reliability of a lithium ion battery is improved significantly.

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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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
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