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A high temperature resistant modified diaphragm and its preparation method

A high-temperature-resistant and high-temperature-resistant resin technology, used in flat products, other household appliances, structural parts, etc., can solve the problems of poor secondary coating permeability of the flat diaphragm, poor heat resistance of the diaphragm, etc., and achieve good Prospects of industrial application, shortening of operation time, and effect of increasing porosity

Active Publication Date: 2022-02-18
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a high temperature resistant modified diaphragm and its preparation method, solve the problem of poor permeability of the secondary coating of the flat diaphragm in the above background technology, and secondly Also solves the problem of poor heat resistance of the diaphragm

Method used

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  • A high temperature resistant modified diaphragm and its preparation method
  • A high temperature resistant modified diaphragm and its preparation method
  • A high temperature resistant modified diaphragm and its preparation method

Examples

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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, comprising the following steps: 1) uniformly mixing a high-temperature-resistant resin, a curing agent, a curing accelerator and a solvent to prepare a high-temperature-resistant resin precursor solution; 2) mixing the collected The diaphragm base material in roll state is placed in an immersion tank filled with a high-temperature resistant resin precursor solution, and then left to stand in a vacuum; 3) The wound-up diaphragm after being static is broken and taken out, dried and cured to obtain a high-temperature-resistant modified diaphragm . The high-temperature-resistant modified diaphragm prepared by the present invention includes a porous diaphragm base material and a three-dimensional high-temperature-resistant polymer support layer, and the three-dimensional high-temperature-resistant polymer support layer covers the surface and internal pores of the diaphragm base material, which can effectively solve the problem of improvement. The problem of poor wettability of the separator by the permanent precursor solution can be solved, the heat resistance of the separator can be improved, and the safety performance of the battery can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a high-temperature-resistant modified diaphragm and a preparation method thereof. Background technique [0002] The world's energy crisis is becoming more and more serious today, and lithium-ion batteries are widely valued as a new energy source. Lithium-ion batteries are now used in mobile phones, cameras, laptops, cars and other products. In the application of lithium-ion batteries, what people are most worried about is the safety issues such as combustion, fire, and even explosion due to the heat release and temperature rise of the battery. The main function of the diaphragm in lithium-ion batteries is to isolate the positive and negative electrodes, so the diaphragm is a key component to ensure the safety of lithium-ion batteries. [0003] At present, the mainstream commercial separators are polyethylene (PE), polypropylene (PP), and some are made ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/414H01M50/417H01M50/449H01M50/451B29D7/01H01M10/0525
CPCB29D7/01H01M10/0525Y02E60/10
Inventor 赵金保池上荷
Owner XIAMEN UNIV
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