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High-temperature-resistant modified diaphragm and preparation method thereof

A high-temperature-resistant and high-temperature-resistant resin technology, which is applied in the field of high-temperature-resistant modified diaphragms and their preparation, can solve the problems of poor secondary coating permeability and poor heat resistance of the flat diaphragm, and achieve good industrialization Application prospects, shortening of operation time, effect of increasing porosity

Active Publication Date: 2021-05-25
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

This patented technology solves problems with existing methods for modifying surfaces during manufacturing processes such as plasma treatment or chemical vapor deposition (CVD). These modifications have been shown to enhance adhesion but they also cause changes in other properties like pore size distribution and crystal structure. By replacing these steps with this new approach we aim to provide an effective way to modify materials without affect their quality or functionality.

Problems solved by technology

This patented technical problem addressed in this patents relates to finding ways to enhance the security of laminar cells during use without compromising their effectiveness or causing damage from overheated reactions caused by flammable materials like organic solvents commonly found inside them.

Method used

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  • High-temperature-resistant modified diaphragm and preparation method thereof
  • High-temperature-resistant modified diaphragm and preparation method thereof
  • High-temperature-resistant modified diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this embodiment, a high-temperature-resistant modified diaphragm, the preparation method includes the following steps:

[0035] 4 parts of bisphenol A epoxy resin, 0.1 part of m-xylylenediamine, 0.01 part of phenolic resin and 95 parts of ethanol are fully mixed to prepare a high temperature resistant resin precursor solution. A flexible porous separator is sandwiched between every 8 mm thickness of the polyethylene (PE) porous ceramic base film with a double-sided ceramic coating thickness of 4 μm and a substrate thickness of 12 μm, so that there is a gap between the layers when it is rolled up. There are gaps. After the solution is fully dissolved and mixed, soak the entire roll of ceramic base membrane in the solution, and let it stand for 3 hours in a vacuum environment with a relative vacuum of -0.1MPa, so that the solution can better enter the surface and pores of the porous ceramic base membrane internal. Afterwards, the entire roll of diaphragm was taken ou...

Embodiment 2

[0038] The difference between Example 2 and Example 1 is: 7 parts of bisphenol A epoxy resin, 2 parts of dicyandiamide, 0.8 parts of 1-carbamoyl imidazole and 91 parts of ethanol are fully mixed to make a high temperature resistant resin precursor solution. A flexible porous separator is sandwiched between every 8mm of the polyethylene (PE) porous ceramic base film with a double-sided ceramic coating thickness of 4um and a substrate thickness of 12um, so that there is a gap between the layers when it is rolled up. void. After the solution is fully dissolved and mixed, soak the entire roll of ceramic base membrane in the solution, and let it stand for 3 hours in a vacuum environment with a relative vacuum of -0.07MPa, so that the solution can better enter the surface and pores of the porous ceramic base membrane internal. Afterwards, the entire roll of diaphragm was taken out from the vacuum environment after breaking the vacuum, and dried in a blast oven at 50°C for 36 hours...

Embodiment 3

[0040] The difference between embodiment 3 and embodiment 1 is: 4 parts of bisphenol F type epoxy resin, 1 part of N-aminoethylpiperazine, 0.5 part of 2,4,6-three (dimethylaminomethyl) phenol It is fully mixed with 94.5 parts of ethanol to make a high temperature resistant resin precursor solution. A flexible porous separator is sandwiched between every 4mm of the polyethylene (PE) porous ceramic base film with a double-sided ceramic coating thickness of 4um and a substrate thickness of 12um, so that there is a gap between the layers when it is rolled up. void. After the solution is fully dissolved and mixed, soak the entire roll of ceramic base membrane in the solution, and let it stand for 3 hours in a vacuum environment with a relative vacuum of -0.1MPa, so that the solution can better enter the surface and pores of the porous ceramic base membrane internal. Afterwards, the entire roll of diaphragm was taken out from the vacuum environment after breaking the vacuum, and dri...

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Abstract

The invention discloses a high-temperature-resistant modified diaphragm and a preparation method thereof. The preparation method comprises the following steps: (1) uniformly mixing high-temperature-resistant resin, a curing agent, a curing accelerator and a solvent to prepare a high-temperature-resistant resin precursor solution; 2) standing the rolled diaphragm base material in a soaking tank containing a high-temperature-resistant resin precursor solution, vacuumizing and standing; and 3) breaking the vacuum of the static rolled diaphragm, taking out, drying and curing to obtain the high-temperature-resistant modified diaphragm. The prepared high-temperature-resistant modified diaphragm comprises the porous diaphragm base material and the three-dimensional high-temperature-resistant polymer supporting layer, the three-dimensional high-temperature-resistant polymer supporting layer covers the surface and the internal pores of the diaphragm base material, the problem that the wettability of a modified precursor solution to the diaphragm is poor can be effectively solved, the heat resistance of the diaphragm is improved, and the safety performance of the battery is ensured.

Description

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Claims

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Application Information

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Owner XIAMEN UNIV
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