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Inorganic/organic composite porous isolating membrane, preparation method and lithium-ion battery thereof

A porous and separator technology, applied in secondary batteries, battery components, secondary battery repair/maintenance, etc., can solve the problems of battery chemical performance attenuation, impact on battery performance, safety performance degradation, etc., to achieve low coating Layer water absorption, reduce the risk of short circuit, reduce the effect of water content

Inactive Publication Date: 2018-04-10
深圳市旭然电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the above that the presence of any trace of water in the battery will cause the decomposition reaction of the electrolyte salt to continue. As the battery cycle reaction proceeds, the generated fluoride and reaction by-products will seriously affect the performance of the battery, eventually leading to The attenuation of battery electrochemical performance and the decline of safety performance

Method used

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  • Inorganic/organic composite porous isolating membrane, preparation method and lithium-ion battery thereof
  • Inorganic/organic composite porous isolating membrane, preparation method and lithium-ion battery thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of Inorganic / Organic Composite Functionalized Porous Separator Membrane

[0036] The coating slurry formulation is based on the weight percentage of the dry material. The coating slurry consists of three parts: 5 wt% water-based polymer binder, 1 wt% sodium carboxymethyl cellulose, and 94 wt% inorganic ceramic particles. Among them, the inorganic ceramic particles are selected from Al 2 o 3 , wherein, the D50 of the small-sized particle is 0.2um, and the mass percentage that it occupies is 30%, and the D50 of its large-sized particle is 0.7um, and the mass percentage that it occupies is 64%; In the present invention, Al 2 o 3 represented by other inorganic materials such as SiO 2 , γ-AlOOH, BaSO 4 , CaO, TiO 2 , ZnO 2 , MgO, ZrO 2 , SnO 2 Also applicable to the present invention, the ratio of its particle size to Al 2 o 3 Same. The water-based polymer binder is selected from styrene / acrylate copolymer emulsion, and its dry glue water drop contact ...

Embodiment 2

[0056] The difference between embodiment 2 and embodiment 1 is the composition of coating slurry:

[0057] The coating slurry formulation is based on the weight percentage of the dry material. The coating slurry consists of three parts: 5 wt% water-based polymer binder, 1 wt% sodium carboxymethyl cellulose, and 94 wt% inorganic ceramic particles. Among them, the inorganic ceramic particles are selected from Al 2 o 3 , the D50 of the small-sized particles is 0.2um, and its mass percentage is 64%, the D50 of its large-sized particles is 0.7um, and its mass percentage is 30%. The water-based polymer binder is styrene / acrylic acid Ester copolymer emulsion, the dry glue water drop contact angle is 140 o . During the preparation of the slurry, the solvent is deionized water, wherein the weight of the solid part accounts for about 50 wt% of the total weight of the slurry.

[0058] The rest are the same as in Example 1, and will not be repeated here.

Embodiment 3

[0060] The difference between embodiment 3 and embodiment 1 is the composition of coating slurry:

[0061] The coating slurry formulation is based on the weight percentage of the dry material. The coating slurry consists of three parts: 5 wt% water-based polymer binder, 1 wt% sodium carboxymethyl cellulose, and 94 wt% inorganic ceramic particles. Among them, the inorganic ceramic particles are selected from Al 2 o 3 , the D50 of the small-sized particles is 0.2um, and its mass percentage is 30%, the D50 of its large-sized particles is 1.0um, and its mass percentage is 64%. The water-based polymer binder is styrene / acrylic acid Ester copolymer emulsion, the dry glue water drop contact angle is 140 o . During the preparation of the slurry, the solvent is deionized water, wherein the weight of the solid part accounts for about 50 wt% of the total weight of the slurry.

[0062] The rest are the same as in Example 1, and will not be repeated here.

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Abstract

The invention discloses an inorganic / organic composite functional porous isolating membrane. The isolating membrane comprises porous base material and at least one inorganic functional coating adhering to the surface of the porous base material, and aqueous slurry prepared for the inorganic functional coatings is prepared from inorganic ceramic particles, water-soluble polymer thickener and aqueous polymer adhesive; the inorganic ceramic particles comprise the same substance in two types of particle sizes, wherein the average particle size (D50) of the smaller inorganic ceramic particles is 0.2-0.5 micrometer, and the average particle size (D50) of the larger inorganic ceramic particles is 0.6-1.0 micrometer; the aqueous polymer adhesive is a hydrophobic high-molecular polymer with the water drop contact angle of the dry adhesive of the aqueous polymer adhesive 110-140 degrees; the solid content of the aqueous slurry is 40-60%. According to the inorganic / organic composite functional porous isolating membrane, the high-temperature thermal stability of the isolating membrane can be effectively improved by means of the inorganic functional coatings, and the water content of the inorganic coatings is effectively reduced, so that the safe performance of a battery and the stability of long-term circulation are improved.

Description

technical field [0001] The present invention relates to the technical field of lithium ion batteries, more specifically, the present invention relates to an inorganic / organic composite functionalized porous separator and a preparation method thereof, and a lithium ion battery comprising the inorganic / organic composite functionalized porous separator Battery. Background technique [0002] Since its commercial application, lithium-ion batteries have been widely used in various consumer products due to their advantages such as high energy density, high working voltage, long cycle life, no memory effect, green environmental protection, and flexible design of size and shape according to actual needs. The power supply of electronic products has been vigorously promoted and applied in the fields of new energy vehicles and energy storage batteries in recent years. Based on these broad application fields and various practical needs, the development of lithium-ion batteries has been ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M10/42H01M50/403H01M50/446H01M50/449H01M50/491
CPCH01M10/0525H01M10/4235H01M50/431H01M50/403H01M50/449H01M50/411Y02E60/10
Inventor 郑君周鑫
Owner 深圳市旭然电子有限公司
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