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High-temperature-resistant and high-strength diaphragm and preparation method thereof

A high-strength, high-temperature-resistant technology, applied to structural parts, electrical components, battery pack components, etc., can solve problems such as short circuit, puncture, and potential safety hazards, and achieve the effect of improving safety performance and avoiding short circuit

Inactive Publication Date: 2021-07-23
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the temperature rises to 150 degrees, due to the low melting point (135 degrees C) of the PE base film, the separator will gradually soften or even melt. At this time, the mechanical strength of the separator is insufficient and it is easy to be pierced to cause a short circuit. potential safety hazards

Method used

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  • High-temperature-resistant and high-strength diaphragm and preparation method thereof
  • High-temperature-resistant and high-strength diaphragm and preparation method thereof
  • High-temperature-resistant and high-strength diaphragm and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A method for preparing a high-temperature-resistant, high-strength diaphragm, comprising the following steps:

[0031] 1) Coat the water-based ceramic slurry on the base film by micro-gravure roller coating, the base film is PE, so that a ceramic coating with a thickness of 3 μm is formed on the base film, and dry at 60°C for 3 minutes to obtain a ceramic coating diaphragm;

[0032] 2) Coating aramid slurry on the ceramic coating by micro-gravure roller coating to form an aramid coating with a thickness of 1 μm on the ceramic coating, and extracting to obtain a high-temperature-resistant, high-strength diaphragm; , the extractant used in the extraction is water,

[0033] The method for preparing the water-based ceramic slurry is: add 7.5 parts by mass of boehmite powder and 0.085 parts by mass of dispersant to 12 parts by mass of deionized water, stir at a speed of 1000rpm for 0.5h until uniform, and then add 0.05 Thickener in parts by mass, defoamer in 0.12 parts by ...

Embodiment 2

[0038] A method for preparing a high-temperature-resistant, high-strength diaphragm, comprising the following steps:

[0039] 1) Coat the water-based ceramic slurry on the base film by micro-gravure roller coating, the base film is PE, so that a ceramic coating with a thickness of 3 μm is formed on the base film, and dry at 80°C for 4 minutes to obtain a ceramic coating diaphragm;

[0040] 2) Coating aramid slurry on the ceramic coating by micro-gravure roller coating to form an aramid coating with a thickness of 1 μm on the ceramic coating, and extracting to obtain a high-temperature-resistant, high-strength diaphragm; , the extractant used in the extraction is a mixed solution, the mixed solution is a mixture of water and DMAC, and the concentration of DMAC in the mixed solution is 25wt%,

[0041] The method for preparing the water-based ceramic slurry is as follows: add 7.5 parts by mass of alumina powder and 0.1 parts by mass of dispersant to 12 parts by mass of deionized...

Embodiment 3

[0046] A method for preparing a high-temperature-resistant, high-strength diaphragm, comprising the following steps:

[0047] 1) Coat the water-based ceramic slurry on the base film by means of micro-gravure roll coating, the base film is PE, so that a ceramic coating with a thickness of 3 μm is formed on the base film, and dry at 75°C for 2 minutes to obtain a ceramic coating diaphragm;

[0048] 2) Coating aramid slurry on the ceramic coating by micro-gravure roller coating to form an aramid coating with a thickness of 1 μm on the ceramic coating, and extracting to obtain a high-temperature-resistant, high-strength diaphragm; , the extractant used in the extraction is a mixed solution, the mixed solution is a mixture of water and DMAC, and the concentration of DMAC in the mixed solution is 40wt%,

[0049] The method for preparing the water-based ceramic slurry is as follows: add 6 parts by mass of alumina powder and 0.11 parts by mass of dispersant to 12 parts by mass of dei...

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Abstract

The invention discloses a high-temperature-resistant and high-strength diaphragm and a preparation method thereof. The preparation method of the high-temperature-resistant and high-strength diaphragm comprises the steps of coating a base membrane with water-based ceramic slurry, and drying to obtain a ceramic coating diaphragm; and coating the ceramic coating with aramid fiber slurry, performing extraction, and obtaining the high-temperature-resistant and high-strength diaphragm. The method for preparing the water-based ceramic slurry comprises the steps of adding ceramic powder and a dispersing agent into deionized water, uniformly mixing, then adding a thickening agent, a defoaming agent and a binder, and uniformly mixing to obtain the water-based ceramic slurry, wherein the ceramic powder is boehmite powder or alumina powder. The method for preparing the aramid fiber slurry comprises the step of heating an oily solvent and PMIA under a stirring condition to obtain the aramid fiber slurry. The ceramic coating separates the base membrane from the aramid fiber coating, so that the situation that the aramid fiber coating is driven to deform in the softening deformation process of the base membrane under the high-temperature condition, and the overall high-temperature-resistant performance of the diaphragm is affected can be prevented.

Description

technical field [0001] The invention belongs to the technical field of battery separators, and in particular relates to a high-temperature-resistant, high-strength separator and a preparation method thereof. Background technique [0002] At this stage, coated diaphragms are becoming more and more popular. Domestic diaphragm manufacturers generally achieve high temperature resistance (that is, thermal shrinkage performance at high temperatures, the condition is generally 130 °C*1h). Among them, the PE base film provides high mechanical strength, and ceramic coatings such as alumina / boehmite provide high temperature resistance characteristics of 130°C*1h, that is, good thermal shrinkage performance. However, when the temperature rises to 150 degrees, due to the low melting point (135 degrees C) of the PE base film, the separator will gradually soften or even melt. At this time, the mechanical strength of the separator is insufficient and it is easy to be pierced to cause a sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/434H01M50/44H01M50/414H01M50/451
CPCY02E60/10
Inventor 袁海朝徐锋贾亚峰李青刘志强郭占星
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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