Organic/inorganic composite porous isolating membrane, preparation method thereof and electrochemical device

A technology of inorganic composite and isolation membrane, applied in the field of electrochemistry, can solve problems such as affecting the performance of the membrane, and achieve the effects of improving electrical conductivity, good air permeability, and improving force

Active Publication Date: 2013-12-11
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although both of the above two patent applications use a one-time coating process and water can be used as a solvent, it is necessary to carefully select the range of water contact angle of the polymer or monomer used, otherwise it will seriously affect the properties of the obtained separator.

Method used

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  • Organic/inorganic composite porous isolating membrane, preparation method thereof and electrochemical device
  • Organic/inorganic composite porous isolating membrane, preparation method thereof and electrochemical device

Examples

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preparation example Construction

[0031] The preparation method of the organic / inorganic composite porous isolation membrane according to the second aspect of the present invention is used to prepare the organic / inorganic composite porous isolation membrane according to the first aspect of the present invention, comprising the steps of: dividing the organic particles into at least two parts; The first part of organic particles is added to the plasticizer and heated and stirred together to swell the first part of organic particles added, and then the second part of organic particles is added and stirred to swell the second part of organic particles added , and so on, according to the order of addition, the swelling degree of each part of the organic particles changes from high to low; the obtained organic particles with at least two swelling degrees are added to the solvent and mixed with the binder, stirred evenly and then added The inorganic particles are stirred evenly to obtain the organic / inorganic composit...

Embodiment 1

[0057] The positive electrode sheet, negative electrode sheet, non-aqueous electrolyte, and cell molding are the same as the comparative example, and only the separator is prepared in the following manner:

[0058] Add 0.06 parts by mass of ethyl acetoacetate (plasticizer) and 0.14 parts by mass of polyvinylidene fluoride (organic particles) powder into a double planetary mixer, and after stirring at 55 °C for 30 min, add another 2.66 parts by mass of polyvinylidene fluoride Stir the vinyl fluoride powder for 1 hour; then add 0.06 parts by mass of polymethyl acrylate and 68.986 parts by mass of deionized water, and mix at 55°C for 0.5 hour; then add 28 parts by mass of aluminum oxide (average particle size is 1 μm) , stirred at room temperature for 2 hours to obtain an organic / inorganic composite slurry.

[0059] The polypropylene porous substrate is coated on both sides by transfer coating, and is dried in a three-stage oven (each section is 3 meters long, and the temperature...

Embodiment 2

[0061] The positive electrode sheet, negative electrode sheet, non-aqueous electrolyte, and cell molding are the same as the comparative example, and only the separator is prepared in the following manner:

[0062] Add 0.6 parts by mass of dimethyl carbonate (plasticizer) and 0.295 parts by mass of acrylonitrile-butadiene copolymer (organic particles) powder into a double planetary mixer, and after stirring at 45°C for 30 min, add another 5.605 Parts by mass of acrylonitrile-butadiene copolymer powder were stirred for 1 hour; then 0.6 parts by mass of pure acrylic emulsion and 34.2 parts by mass of deionized water were added, and mixed for 0.5 hours at 45°C; then 59 parts by mass of magnesium oxide (average particle size is 5 μm), and stirred at room temperature for 2 hours to obtain an organic / inorganic composite slurry.

[0063] Polypropylene / polyethylene / polypropylene three-layer composite porous substrates were coated on both sides by screen printing, and dried in a three-...

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Abstract

The invention provides an organic / inorganic composite porous isolating membrane, a preparation method thereof and an electrochemical device. According to the first aspect of the invention, the organic / inorganic composite porous isolating membrane comprises a porous base material and an organic / inorganic composite porous coating coated on at least one surface of the porous base material, wherein the organic / inorganic composite porous coating comprises inorganic particles, a binding agent and organic particles with at least two swelling degrees, and the organic particles are swelled by a plasticizer. The preparation method of the organic / inorganic composite porous isolating membrane is used for preparing the organic / inorganic composite porous isolating membrane described in the first aspect of the invention. According to the third aspect of the invention, the electrochemical device comprises the organic / inorganic composite porous isolating membrane described in the first aspect of the invention. Therefore, the organic / inorganic composite porous isolating membrane can form an excellent interface, so that a risk that the risk of blocking holes by the organic particles is reduced, breathability of the organic / inorganic composite porous isolating membrane is improved, and electrical conductivity of the organic / inorganic composite porous isolating membrane is improved.

Description

technical field [0001] The invention relates to the field of electrochemical technology, in particular to an organic / inorganic composite porous isolation membrane, a preparation method thereof, and an electrochemical device. Background technique [0002] In order to solve the safety problems such as easy internal short circuit in traditional electrochemical devices (such as lithium-ion secondary batteries) that use polyolefin porous substrates as separators, many patent applications have disclosed porous substrates, inorganic particles and binders. Organic / inorganic composite porous membrane composed of polymers. [0003] The Chinese Patent Application Publication No. CN102610773A published on July 2, 2012 discloses a polymer lithium ion battery and its separator. The separator includes a porous substrate, an inorganic coating and an organic coating. The organic coating is island-shaped And / or linear distribution, and coated on the surface of porous substrate and / or inorgan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01G11/52H01M50/403H01M50/406H01M50/417H01M50/42H01M50/423H01M50/426H01M50/429H01M50/449H01M50/451H01M50/457H01M50/463H01M50/491
CPCH01M10/0525Y02E60/10H01M50/403H01M50/446H01M50/417H01M50/429H01M50/406H01M50/451H01M50/491H01M50/426H01M50/42H01M50/423
Inventor 赵俊华张盛武蔡芬敏汪圣龙张柏清
Owner DONGGUAN AMPEREX TECH
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