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Lithium ion battery diaphragm and preparation method thereof

A lithium-ion battery and separator technology, applied in battery pack parts, circuits, electrical components, etc., can solve problems such as wrinkling and uneven shrinkage, prevent whitening, improve porosity and air permeability, and control the heating rate. Effect

Active Publication Date: 2020-08-25
SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above technical problems, the object of the present invention is to provide a lithium-ion battery diaphragm and its preparation method, using polyimide resin as a reinforcing agent, aluminum oxide The powder is used as a filler to solve the problems of wrinkling and uneven shrinkage during the resin curing process by improving the curing process and substrate, and improve the porosity and air permeability of the separator

Method used

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  • Lithium ion battery diaphragm and preparation method thereof
  • Lithium ion battery diaphragm and preparation method thereof
  • Lithium ion battery diaphragm and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] This embodiment provides a lithium-ion battery separator, the preparation method of which comprises the following steps:

[0032] Alumina powder is added to the polyimide resin and stirred and mixed to obtain a slurry. When stirring and mixing, a planetary stirring mill or an electric mechanical stirrer is used for mixing. The mixing time is 0.5h, wherein the polyimide The concentration of resin is 3%, and wherein, the solvent that polyimide resin uses is DMAC scientific name dimethylacetamide and NMP (N-methylpyrrolidone), and the quality of described aluminum oxide powder is no more than polyimide 30% of resin mass;

[0033] Coat the slurry on the base film, the coating method is wire bar coating or micro-gravure coating, control the air humidity in the room to not exceed 50%, and then heat and dry the base film after coating the slurry at 30°C to Constant quality;

[0034] The base film after drying is fixed on the glass substrate for curing to prepare a high-tempe...

Embodiment 2

[0040] This embodiment provides a lithium-ion battery diaphragm, the preparation method of which comprises the following steps:

[0041] Alumina powder is added to polyimide resin, and the slurry is obtained after stirring and mixing. When stirring and mixing, a planetary stirring mill or an electric mechanical stirrer is used for mixing. The mixing time is 1h, wherein the polyimide The concentration of the resin is 5%, and the mass of the alumina powder does not exceed 30% of the mass of the polyimide resin;

[0042] Coat the slurry on the base film, the coating method is wire bar coating or micro-gravure coating, control the air humidity in the room to not exceed 50%, and then heat and dry the base film after coating the slurry at 50°C to Constant quality;

[0043] The base film after drying is fixed on the glass substrate for curing to prepare a high-temperature-resistant and high-strength lithium-ion battery separator, which can be applied not only to conventional lithium...

Embodiment 3

[0049] This embodiment provides a lithium-ion battery separator, the preparation method of which comprises the following steps:

[0050] Alumina powder is added to polyimide resin, and the slurry is obtained after stirring and mixing. When stirring and mixing, a planetary stirring mill or an electric mechanical stirrer is used for mixing. The mixing time is 0.5h, wherein the polyimide The concentration of the amine resin is 3%, and the mass of the alumina powder does not exceed 30% of the mass of the polyimide resin;

[0051] Coat the slurry on the base film, the coating method is wire bar coating or micro-gravure coating, control the air humidity in the room to not exceed 50%, and then heat the base film after coating the slurry at 30-80°C Dry to constant mass;

[0052] Fix the dried base film on the glass substrate for curing to prepare a high-temperature-resistant and high-strength lithium-ion battery separator, which can be applied not only to conventional lithium-ion bat...

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Abstract

The invention discloses a lithium ion battery diaphragm and a preparation method thereof. The preparation method comprises the following steps that aluminum oxide powder is added into polyimide resin,slurry is prepared after stirring and mixing, wherein the mass of the aluminum oxide powder does not exceed 30% of the mass of the polyimide resin; a base membrane is coated with the slurry, and thebase membrane coated with the slurry is heated and dried at 30-80 DEG C until the mass is constant; and the dried base membrane is fixed on a glass substrate for curing.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery diaphragm and a preparation method thereof. Background technique [0002] Lithium-ion battery separators currently in use are mainly composed of porous organic polymer membranes. Typical organic separators are mainly composed of polyethylene (PE), polypropylene (PP), PP / PE / PP composite separators. The disadvantage of these organic polyolefin separators is that the melting point of the polymer is generally low. When the external temperature of the lithium battery reaches the melting point After that, there will be a certain degree of heat shrinkage and deformation. If the heat shrinkage is too large, the pores of the separator will become larger, and the positive and negative electrodes of the battery will be in contact, causing a short circuit, and there are hidden dangers to the safety performance of the battery. In addition, the organic polyolefin sep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14
CPCH01M50/403H01M50/446Y02E60/10
Inventor 李茹张铭霞程之强何子杨聂永俊齐学礼孙淑敏岳双双
Owner SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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