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Water-based metal ion secondary battery diaphragm, and preparation method and application thereof

A metal ion and secondary battery technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as poor lyophilicity, instability, diaphragm gas permeability, strength and other physical properties that are difficult to meet the use requirements, etc. Achieve the effects of improving liquid retention, ensuring performance, and wide heat resistance range

Inactive Publication Date: 2019-10-22
安徽金力新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the disadvantages of relatively poor or unstable lyophilicity existing in the diaphragm of the existing water-based metal ion secondary battery, or that the physical properties of the diaphragm such as air permeability and strength are difficult to meet the requirements of use, and to provide a water-based metal ion Secondary battery separator and its preparation method and application

Method used

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  • Water-based metal ion secondary battery diaphragm, and preparation method and application thereof
  • Water-based metal ion secondary battery diaphragm, and preparation method and application thereof
  • Water-based metal ion secondary battery diaphragm, and preparation method and application thereof

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preparation example Construction

[0042] The preparation method of the aqueous metal ion secondary battery diaphragm of the present invention comprises the following steps:

[0043] Step 1. Coating a hydrophobic coating on one or both sides of the porous base membrane by spray coating, dimple coating, dip coating or other methods;

[0044] Step 2. Conduct CO on the surface of the coated base film 2 For pulse laser radiation treatment, the radiation beam wavelength is 9.1 μm to 10.6 μm, and the radiation duration is 100 to 500 ns, preferably 100 to 200 ns.

[0045] Step 3, cleaning and vacuum-drying the basement membrane after radiation treatment to constant weight treatment; specifically, first placing the basement membrane in acetone for rinsing, and then putting it into distilled water to wash away excess acetone; then extracting the basement membrane The film is placed in a vacuum environment and dried at 30-65 degrees Celsius for 0.5-1.5 hours;

[0046] Step 4. Put the base film after drying and constant...

Embodiment 1

[0049] A water-based metal ion secondary battery separator of the present embodiment includes a polyethylene porous base film (polyethylene is melt-extruded and then stretched according to thermally induced phase separation (TIPS)), and the polyethylene porous base film The surface is coated with a hydrophobic coating, and the surface of the hydrophobic coating is grafted with a hydrophilic coating. The hydrophobic substance used in the hydrophobic coating is carboxymethyl cellulose, and the thickness of the hydrophobic coating is 1 μm. The coating of the hydrophilic coating includes a solvent and a hydrophilic substance, wherein the hydrophilic substance is selected from acrylic acid monomer, the solvent is ethanol, and the ratio of the solvent to the hydrophilic substance is 3:1.

[0050] The preparation method of the aqueous metal ion secondary battery diaphragm of the present embodiment comprises the following steps:

[0051] Step 1. Coating a hydrophobic coating on one s...

Embodiment 2

[0056] A water-based metal ion secondary battery separator in this embodiment includes a polyethylene porous base film, the surface of the polyethylene porous base film is coated with a hydrophobic coating, and the surface of the hydrophobic coating is grafted with hydrophilic Water-based coating. The hydrophobic substance used in the hydrophobic coating is selected from cyclomethicone, and the thickness of the hydrophobic coating is 2 μm. The coating of the hydrophilic coating includes a solvent and a hydrophilic substance, wherein the hydrophilic substance is selected from acrylic acid-sodium acrylate copolymer, the solvent is methanol, and the ratio of the solvent to the hydrophilic substance is 5:1.

[0057] The preparation method of the aqueous metal ion secondary battery diaphragm of the present embodiment comprises the following steps:

[0058] Step 1, coating the hydrophobic coating on both sides of the porous base membrane by means of dip coating;

[0059] Step 2. C...

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Abstract

The invention discloses a water-based metal ion secondary battery diaphragm, and a preparation method and application thereof, and belongs to the technical field of lithium battery diaphragms. The water-based metal ion secondary battery diaphragm comprises a porous base membrane; the surface of the porous base membrane is coated with a hydrophobic coating; the surface of the hydrophobic coating isgrafted with a hydrophilic coating; the hydrophilic coating is grafted on the surface of the hydrophobic coating through a laser radiation surface grafting method; the wavelength of a light beam forradiation is 9.1-10.6 [mu]m; and the radiation duration is 100-500 ns, preferably 100-200 ns. By adopting the technical scheme provided by the invention, the wettability and the liquid retention of the diaphragm can be effectively improved on the basis of keeping the original excellent physical properties, conductivity and cycle performance of the polymer diaphragm, so that the use requirements ofthe water-based metal ion secondary battery diaphragm are met.

Description

technical field [0001] The invention belongs to the technical field of lithium battery separators, and more specifically relates to a water-based metal ion secondary battery separator and a preparation method and application thereof. Background technique [0002] In recent years, lithium-ion batteries have become an important power source due to their advantages such as high energy density, long cycle life, low self-discharge rate, high open circuit voltage, no heavy metal pollution, and no memory effect, and are therefore widely used as notebook-type personal batteries. Power supplies for computers, cell phones, and other portable devices. The lithium battery separator is one of the important components of the lithium battery. Its function is to separate the positive and negative electrodes and ensure the normal migration of lithium ions at the same time to achieve charging and discharging. The performance of the lithium battery separator directly affects the performance of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/36
CPCH01M10/36H01M50/403H01M50/449H01M50/411Y02E60/10
Inventor 晋沛沛邓豪胡韬王杰
Owner 安徽金力新能源有限公司
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