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Composite lithium battery diaphragm with self-adhesive coating and preparation method thereof

A self-adhesive, lithium-composite technology, applied in the direction of circuits, electrical components, battery components, etc., can solve the problems of battery thermal safety battery charge and discharge performance degradation, reduce the porosity of the composite film and ion transfer efficiency, etc., to achieve enhanced Improvement of storage discharge performance, insulation protection, wettability and high temperature resistance

Active Publication Date: 2021-12-07
广东九彩新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the adhesives in the prior art will destroy the original microporous structure of the polyolefin-based film, significantly reducing the porosity and ion transfer efficiency of the composite film, resulting in battery thermal safety and battery charge and discharge performance Deterioration problem, the purpose of the present invention is to provide a kind of composite lithium battery separator with self-adhesive coating and its preparation method

Method used

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  • Composite lithium battery diaphragm with self-adhesive coating and preparation method thereof

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Embodiment 1

[0037] A composite lithium battery diaphragm with a self-adhesive coating, the composite lithium battery diaphragm is composed of a coating material and a base film; wherein, the base film is a polyolefin microporous film, and the coating material is a self-adhesive organic composite microsphere; The preparation method of sticky organic composite microsphere comprises the following steps:

[0038] Step 1, weigh polyethylene glycol octylphenyl ether and mix it with water, stir until it is completely dissolved, add indium triselenide nanopowder, stir and disperse evenly, import it into a grinding tank for ball milling, and obtain diselenide triselenide Indium mixed liquid; wherein, the mass ratio of polyethylene glycol octylphenyl ether, diindium triselenide nanopowder and water is 1:0.4:2.

[0039] Step 2, preparing diyttrium trioxide / diselenide diindium compound:

[0040] S1. Take diyttrium trioxide and mix it with deionized water, add dropwise ammoniacal liquor to the pH=10....

Embodiment 2

[0051] A composite lithium battery diaphragm with a self-adhesive coating, the composite lithium battery diaphragm is composed of a coating material and a base film; wherein, the base film is a polyolefin microporous film, and the coating material is a self-adhesive organic composite microsphere; The preparation method of sticky organic composite microsphere comprises the following steps:

[0052] Step 1, weigh polyethylene glycol octylphenyl ether and mix it with water, stir until it is completely dissolved, add indium triselenide nanopowder, stir and disperse evenly, import it into a grinding tank for ball milling, and obtain diselenide triselenide Indium mixed liquid; wherein, the mass ratio of polyethylene glycol octylphenyl ether, diindium triselenide nanopowder and water is 1:0.3:1.5.

[0053] Step 2, preparing diyttrium trioxide / diselenide diindium compound:

[0054] S1. Take diyttrium trioxide and mix it with deionized water, add dropwise ammoniacal liquor to the pH=1...

Embodiment 3

[0065] A composite lithium battery diaphragm with a self-adhesive coating, the composite lithium battery diaphragm is composed of a coating material and a base film; wherein, the base film is a polyolefin microporous film, and the coating material is a self-adhesive organic composite microsphere; The preparation method of sticky organic composite microsphere comprises the following steps:

[0066] Step 1, weigh polyethylene glycol octylphenyl ether and mix it with water, stir until it is completely dissolved, add indium triselenide nanopowder, stir and disperse evenly, import it into a grinding tank for ball milling, and obtain diselenide triselenide Indium mixed liquid; wherein, the mass ratio of polyethylene glycol octylphenyl ether, diindium triselenide nanopowder and water is 1:0.5:3.

[0067] Step 2, preparing diyttrium trioxide / diselenide diindium compound:

[0068] S1. Take diyttrium trioxide and mix it with deionized water, add dropwise ammoniacal liquor to the pH=10....

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Abstract

The invention discloses a composite lithium battery diaphragm with a self-adhesive coating and a preparation method thereof. The composite lithium battery diaphragm is formed by compounding a coating material and a base membrane, wherein the base membrane is a polyolefin microporous membrane, and the coating material is self-adhesive organic composite microspheres; the preparation method of the self-adhesive organic composite microspheres comprises the following steps: 1, preparing diindium triselenide into a diindium triselenide mixed solution by using a wet grinding method; 2, mixing yttrium oxide and diindium triselenide mixed liquid to form a yttrium oxide / diindium triselenide compound; 3, using a reactant of polyoxyethylene dihydric alcohol and toluene diisocynate for coating, and obtaining the self-adhesive organic composite microspheres. The prepared composite lithium battery diaphragm has self-adhesion, the porosity and the ion transfer efficiency of the composite diaphragm cannot be reduced by the coating material on the surface of the composite diaphragm, the permeability of polyolefin to ions is also improved, and the storage and discharge performance of the battery diaphragm is enhanced.

Description

technical field [0001] The invention relates to the field of composite lithium battery separators, in particular to a composite lithium battery separator with a self-adhesive coating and a preparation method thereof. Background technique [0002] As one of the core key materials of lithium batteries, the battery separator mainly prevents the contact between the positive and negative electrodes, prevents the short circuit caused by the contact of the positive and negative electrodes, and at the same time allows the electrolyte ions to migrate freely. Therefore, the separator has a decisive influence on the characteristic parameters of the battery such as capacity, cycle performance, charge-discharge current density and safety. At present, lithium battery separators used in the market are mainly polyolefin separators with microporous structure, including single-layer polyethylene, single-layer polypropylene, and polyolefin three-layer composite membranes. [0003] In order to...

Claims

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Application Information

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IPC IPC(8): H01M50/417H01M50/403H01M50/431H01M50/443H01M50/489H01M50/497H01M50/446H01M50/449
CPCH01M50/417H01M50/443H01M50/403H01M50/431H01M50/489H01M50/497H01M50/446H01M50/449Y02E60/10
Inventor 曹畅崔永哲林文丹
Owner 广东九彩新材料有限公司
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