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Double-closed-pore diaphragm as well as preparation method and application thereof

A diaphragm and closed-cell technology, which is applied in the field of double closed-cell diaphragm and its preparation, can solve the problem of low performance of diaphragm closed-cell, and achieve the effect of improving battery safety performance and air permeability

Pending Publication Date: 2021-11-12
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

[0003] The purpose of the present invention is to provide a double closed-cell diaphragm for the defect of low closed-cell performance of the diaphragm in the prior art

Method used

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  • Double-closed-pore diaphragm as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method of a double obturator diaphragm, comprising the following steps:

[0029] Step 1: Preparation of PE particles

[0030] First, use a beaker to weigh 950g of styrene as a solvent, then weigh 50g of PE powder with a viscosity-average molecular weight of 500,000 and put it in the beaker, and use a stirrer to stir at a rate of 500RPM / min to promote the dissolution of the PE powder. The dissolution time is 60min , until a transparent and stable solution a is formed;

[0031] Then, put the solution a into the stainless steel watering can for use; prepare a water tank filled with deionized water, use the watering can to quickly spray the solution a of PE to the inside of the water tank in the form of particle sputtering; solution a is contacted in the form of particles After the ionized water enters its interior, it condenses into a grain of PE particles b through the principle of phase separation. ;

[0032] Finally, pass the obtained large amount of PE...

Embodiment 2

[0045] A preparation method of a double obturator diaphragm, comprising the following steps:

[0046] Step 1: Preparation of PE particles

[0047] First, use a beaker to weigh 970g of styrene as a solvent, then weigh 30g of PE powder with a molecular weight of 500,000 and place it in the beaker, and use a stirrer to stir at a rate of 600RPM / min to promote the dissolution of the PE powder. The dissolution time is 50min. until a transparent and stable solution a is formed;

[0048] Then, put solution a into a stainless steel watering can for use. In addition, prepare a sink filled with deionized water, and use a watering can to quickly spray the PE solution a into the sink in the form of particle sputtering. Solution a enters into the interior after contacting deionized water in the form of particles, and condenses into a grain of PE organic particles b through the principle of phase separation;

[0049] Finally, pass the obtained large amount of PE organic particles b throug...

Embodiment 3

[0055] A preparation method of a double obturator diaphragm, comprising the following steps:

[0056] Step 1: Preparation of PE particles

[0057] First, use a beaker to weigh 950g of styrene as a solvent, then weigh 50g of PE powder with a viscosity-average molecular weight of 500,000 and put it in the beaker, and use a stirrer to stir at a rate of 500RPM / min to promote the dissolution of the PE powder. The dissolution time is 60min , until a transparent and stable solution a is formed;

[0058]Then, put the solution a into the stainless steel watering can for use; prepare a water tank filled with deionized water, use the watering can to quickly spray the solution a of PE to the inside of the water tank in the form of particle sputtering; solution a is contacted in the form of particles After the ionized water enters its interior, it condenses into a grain of PE particles b through the principle of phase separation. ;

[0059] Finally, pass the obtained large amount of PE ...

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Abstract

The invention discloses a preparation method of a double-closed-pore diaphragm, which comprises the following steps: step 1, dissolving PE powder in styrene, and granulating in a particle sputtering manner to obtain PE particles; step 2, adding flame-retardant inorganic powder, the PE particles and a dispersing agent into deionized water, uniformly mixing and stirring, adding a thickening agent, a defoaming agent and a binder, and uniformly stirring to obtain water-based slurry; and 3, coating one side or two sides of a PE base membrane with the obtained water-based slurry in a micro gravure roller coating manner, and drying to obtain the double-closed-pore diaphragm. According to the double-closed-pore diaphragm, the PE base membrane is combined with the composite coating of the inorganic particles and the organic particles, so that the diaphragm has high-temperature resistance and closed-pore performance at the same time. When the diaphragm is subjected to a high temperature of 130 DEG C or above, the organic particles start to melt to fill and seal pores in the coating, so that the migration of lithium ions is blocked, and the safety performance of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium battery separators, in particular to a double closed-cell separator and its preparation method and application. Background technique [0002] The battery is mainly composed of positive electrode material, negative electrode material, electrolyte and separator. The separator is an important part of the battery. The separator is mainly composed of a microporous film or a non-woven fiber sheet, which separates the positive electrode and the negative electrode of the battery in the battery. The effect of short-circuiting the two poles has electronic insulation and ion conductivity. When the temperature rises, the separator has the protective effect of self-closing micropores, which can prevent the battery from exploding due to short circuit. Therefore, the research on the closed-pore performance of the separator is very important to improve the safety of the battery. Contents of the invention [00...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/443H01M50/446H01M50/449H01M50/489H01M10/052
CPCH01M50/403H01M50/449H01M50/446H01M50/443H01M50/489H01M10/052Y02E60/10
Inventor 袁海朝徐锋贾亚峰李青刘志强
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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