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Organic functional porous isolating membrane, preparation method and lithium ion battery

A separator and porosity technology, which is applied in the field of organic functional porous separator and its preparation, can solve the problems affecting the functionality of the coating, and achieve the effects of improving quality, excellent adhesion, and maintaining rate performance

Active Publication Date: 2017-09-01
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

Due to the sameness of the materials and coating specifications on both sides, the two coating surfaces of the same specification of the separator have different bonding effects when they are pressed and bonded with the positive and negative electrodes of the battery with different physical properties, which in turn affects Maximize the functionality of the coating

Method used

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  • Organic functional porous isolating membrane, preparation method and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A kind of organic functionalized porous separator

[0046] The coating slurry formulation on the positive electrode surface of the lithium battery on the porous separator is in dry weight percentage, and the coating slurry consists of 8wt% styrene / acrylate copolymer emulsion, 2wt% carboxymethylcellulose sodium, 90wt% poly Vinylidene fluoride consists of three parts, among which polyvinylidene fluoride is selected from hexafluoropropylene and vinylidene fluoride copolymerization high molecular polymer with a degree of copolymerization of 3% and a melting temperature of 150°C. For polyvinylidene fluoride, the average particle diameter D50 is 0.15-1.0 μm. The water-based polymer binder is selected from styrene / acrylate copolymer emulsion, and the water-based polymer thickener is selected from sodium carboxymethyl cellulose. During the preparation of the slurry, the solvent is deionized water, wherein the weight of the solid part accounts for 30wt% of the total weight of t...

Embodiment 2

[0050] The difference between embodiment 2 and embodiment 1 lies in the thickness specifications of the coating slurry on the positive electrode surface of the lithium battery on the porous separator:

[0051] Wherein, the coating slurry on the positive electrode surface of the lithium battery is used on the porous separator to coat the surface of the separator, and the coating thickness is 4 μm; then, the coating slurry on the negative electrode surface of the lithium battery is carried out on the porous separator. The other surface of the separator was coated with a coating thickness of 2 μm to obtain an organic functionalized porous separator with a total thickness of 18 μm.

[0052] The rest are the same as in Example 1, and will not be repeated here.

Embodiment 3

[0053] The difference between embodiment 3 and embodiment 1 lies in the thickness specifications of the coating slurry on the negative electrode surface of the lithium battery on the porous separator:

[0054] Wherein, use the coating slurry on the positive electrode surface of the lithium battery on the porous separator to coat the surface of the separator, and the coating thickness is 2 μm; then, use the coating slurry on the negative electrode surface of the lithium battery on the porous separator. The other surface of the separator was coated with a coating thickness of 4 μm to obtain an organic functionalized porous separator with a total thickness of 18 μm.

[0055] The rest are the same as in Example 1, and will not be repeated here.

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Abstract

The invention discloses an organic functional porous isolating membrane, a preparation method and a lithium ion battery, and aims to the solve the problem that a function of a coating layer is influenced caused by different binding effects when the surfaces of two coating layers of the same specification of an isolating membrane are laminated and glued with positive and negative plates of different physical properties of a battery. According to the main points of the technical scheme, the organic functional porous isolating membrane comprises a porous base material and organic functional coating layers attached to two surfaces of the porous base material; and each organic functional coating layer comprises organic functional polymer polyvinylidene fluoride, an aqueous polymer thickening agent, and an aqueous polymer binder. According to the different characteristics of the positive and negative electrode materials of the lithium ion battery corresponding to the two surfaces of the porous base material, the organic functional polymer polyvinylidene fluoride with different copolymerization degrees and fusing temperatures can be selected on the surfaces of the isolating membranes of the corresponding positive and negative electrodes, so that the safety performance and the long-term cycling stability of the battery can be improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, more specifically, the invention relates to an organic functionalized porous separator and a preparation method thereof, and a lithium-ion battery comprising the organic functionalized porous separator. Background technique [0002] Since the promotion of commercialization, lithium-ion batteries have been widely used as a variety of portable batteries due to their 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 appliances, these broad application fields and various practical needs have greatly promoted the development of lithium-ion batteries. [0003] At present, most of the separators used in lithium-ion batteries and lithium-ion polymer batteries are polyolefin films, such as polyethylene film (PE), polypropylene film (PP) o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/18H01M2/14H01M10/0525
CPCH01M10/0525H01M50/403H01M50/411H01M50/463Y02E60/10
Inventor 方园
Owner 深圳市旭然电子有限公司
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