Preparation method of porous composite isolating membrane

A technology of isolation film and base film, which is applied to household components, applications, electrical components, etc., can solve the problems of unfavorable cost control of electrochemical devices, increase the cost of isolation film, etc., so as to improve uneven tension, improve force, and improve quality products. rate effect

Active Publication Date: 2015-01-07
DONGGUAN AMPEREX TECH +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The above-mentioned preparation method increases the cost of the isolation film, which is already high, which is extremely unfavorable for controlling the cost of the electrochemical device

Method used

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  • Preparation method of porous composite isolating membrane

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preparation example Construction

[0011] Firstly, the preparation method of the porous composite separator according to the present invention is described, including the steps: (1) forming process of the porous separator substrate: using organic particles as raw material to prepare the porous separator substrate; (2) functional material coating Coating process: coating the functional material coating on at least one surface of the obtained porous isolation membrane substrate to obtain a porous isolation membrane substrate with a functional material coating; (3) heat treatment process: coating the functional material The layer is dried, and the porous separator substrate and the functional material coating on the surface are heat-treated to obtain a porous composite separator.

[0012] In the preparation method of the porous composite isolation membrane according to the present invention, the coating process of the functional material coating is integrated into the traditional preparation process of the porous i...

Embodiment 1

[0039] (1) The molding process of the porous isolation film base material: the organic particle polyethylene, the plasticizer paraffin oil, and the solvent acetone are mixed in a weight ratio of 50:10:40, and then extruded through a twin-screw extruder, and the process is carried out horizontally and then vertically Stretching to form a base film, wherein the stretched base film has a transverse stretch rate of 900%, a longitudinal stretch rate of 700%, a thickness of 11 μm, and a width of 2.2 meters; then the stretched base film Immersed in the extractant dichloroethane to form a porous isolation membrane substrate.

[0040] (2) Coating process of functional material coating: Utilize the dipping coating method to apply aluminum oxide slurry (particle size is 0.6 μ m) on the two surfaces of the porous isolation membrane substrate after extraction to obtain wet membrane.

[0041] (3) Heat treatment process: The wet film is heat-set in a three-stage oven (the temperature of eac...

Embodiment 2

[0043] (1) The molding process of the porous isolation membrane base material: the organic particle polypropylene, the plasticizer dioctyl phthalate, the solvent N-methylpyrrolidone, and the filler calcium carbonate are mixed in a weight ratio of 45:8:30:17 After mixing, it is extruded by a single-screw extruder, and stretched longitudinally and then transversely to form a base film, wherein the transverse stretch rate of the stretched base film is 50%, the longitudinal stretch rate is 50%, and the thickness is 45 μm, and the width is 2.1 meters; after that, the stretched base film is immersed in the extractant n-hexane to form a porous isolation film substrate.

[0044] (2) Coating process of functional material coating: apply silica slurry (with a particle size of 0.01 μm) to one of the surfaces of the extracted porous isolation membrane substrate by spray coating method to obtain a wet film .

[0045] (3) Heat treatment process: The wet film is heat-set in a three-stage ov...

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Abstract

The invention provides a preparation method of a porous composite isolating membrane. The preparation method comprises the following steps: (1) moulding technology of the porous composite isolating membrane: preparing a porous isolating membrane basic material from organic particles; (2) coating technology of a functional material coating: coating a functional material on at least one surface of the porous isolating membrane basic material so as to obtain a porous isolating membrane basic material with a functional material coating; (3) thermal treatment technology: drying the functional material coating, ad carrying out a thermal treatment on the porous isolating membrane basic material and the functional material coating so as to obtain the porous composite isolating membrane. The provided preparation method can prepare a porous composite isolating membrane with an excellent performance, and has the advantages of high efficiency and low cost. The prepared porous composite isolating membrane has the advantages of high pore rate, good breathability, high binding performance, high mechanical strength, and high thermal stability.

Description

technical field [0001] The invention relates to the field of lithium ion secondary batteries, in particular to a preparation method of a porous composite separator. Background technique [0002] In order to solve the safety problems such as easy internal short circuit and easy deformation of traditional electrochemical devices (such as lithium-ion secondary batteries) that use polyolefins and non-woven fabrics as separators, many patent applications have disclosed the use of functional material coatings. (such as PVDF layer, aluminum oxide layer, etc.) to improve the thermal stability and mechanical strength of the separator and the technical solution of the interface adhesion of the electrochemical device. Usually, a functional material coating is applied on a porous separator substrate that has been prepared or even cut into a narrow width (such as polyolefin, non-woven fabric, etc.), and then dried. The above-mentioned preparation method increases the cost of the isolati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/36C08L23/06C08L23/12C08L27/16C08L33/20D06M11/45D06M15/256H01M2/14H01M2/16D06M101/30H01M50/406H01M50/414H01M50/417H01M50/42H01M50/426H01M50/431H01M50/449H01M50/451H01M50/491
CPCB29K2105/0038B29C48/08H01M10/0525B29K2101/00B29K2105/04B29L2009/005B29L2031/3468B29C48/91Y02E60/10H01M50/449H01M50/417H01M50/406H01M50/451H01M50/414H01M50/491H01M50/426H01M50/42
Inventor 赵俊华汪圣龙张盛武张柏清
Owner DONGGUAN AMPEREX TECH
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