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Puncture-resistant inorganic composite coated diaphragm and preparation method thereof

An inorganic composite, puncture-resistant technology, applied in structural parts, electrical components, battery pack components, etc., can solve the problems of uneven thickness of inorganic ceramic-coated diaphragms, weak puncture strength, and weak viscosity recovery ability.

Pending Publication Date: 2022-08-05
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

[0005] 1. Weak puncture strength caused by poor flexibility of inorganic coating slurry; 2. Relatively low hardness (ie, puncture strength) of inorganic ceramic coating diaphragm at high temperature; 3. Poor ductility and viscosity recovery ability of inorganic coating slurry Uneven thickness of inorganic ceramic coating diaphragm and uneven puncture strength caused by weak

Method used

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  • Puncture-resistant inorganic composite coated diaphragm and preparation method thereof
  • Puncture-resistant inorganic composite coated diaphragm and preparation method thereof
  • Puncture-resistant inorganic composite coated diaphragm and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A preparation method of a puncture-resistant inorganic composite coating diaphragm, comprising the following steps:

[0035] Step 1: In a stirring tank, water, dispersant and binder are stirred at 1400 rpm for 35 minutes until uniform, then add hydroxide and stirred at 1300 rpm for 35 minutes to mix evenly, and sand-milled at 800 rpm for 2 times to obtain a dispersed slurry, wherein , in terms of parts by mass, the ratio of water, dispersant, binder and hydroxide is 12:0.4:2.8:2.6, the hydroxide is magnesium hydroxide, the dispersant is sodium polyacrylate, and the binder is polyacrylate vinylidene fluoride;

[0036] Step 2, in the stirring tank, the water, the dispersant and the binder are stirred at 1000rpm for 30min to be uniform to obtain an agglomerated slurry, wherein, in parts by mass, the ratio of water, the dispersant and the binder is 10. : 0.3: 2.9, the dispersant is sodium polyacrylate, and the binder is polyvinylidene fluoride;

[0037] Step 3: In a stirr...

Embodiment 2

[0040] A preparation method of a puncture-resistant inorganic composite coating diaphragm, comprising the following steps:

[0041] Step 1, in a stirring tank, water, dispersant and binder are stirred at 1500rpm for 40min until uniform, then add hydroxide and stir at 1400rpm for 40min to mix uniformly, and sand at 900rpm for 3 times to obtain a dispersed slurry, wherein , in terms of parts by mass, the ratio of water, dispersant, binder and hydroxide is 13:0.5:3.0:2.8, the hydroxide is aluminum hydroxide, the dispersant is sodium polymethacrylate, the binder is is polyvinylidene fluoride;

[0042] Step 2, in the stirring tank, water, dispersant and binder are stirred at 1200rpm for 35min to obtain agglomerated slurry, wherein, in parts by mass, the ratio of water, dispersant and binder is 11 : 0.4: 3.1, the dispersant is sodium polymethacrylate, and the binder is polyvinylidene fluoride;

[0043]Step 3, in the stirring tank, stir the dispersed slurry obtained in step 1 and t...

Embodiment 3

[0046] A preparation method of a puncture-resistant inorganic composite coating diaphragm, comprising the following steps:

[0047] Step 1: In a stirring tank, water, dispersant and binder are stirred at 1600 rpm for 45 minutes until uniform, then add hydroxide and stirred at 1500 rpm for 45 minutes to mix evenly, and sand-milled at 1000 rpm for 4 times to obtain a dispersed slurry, wherein , in terms of parts by mass, the ratio of water, dispersant, binder and hydroxide is 14:0.6:3.2:3.0, the hydroxide is magnesium hydroxide, and the dispersant is sodium dodecylbenzenesulfonate, The binder is polyvinylidene fluoride;

[0048] Step 2, in the stirring tank, the water, the dispersant and the binder are stirred at 1400rpm for 40min to be uniform to obtain an agglomerated slurry, wherein, in parts by mass, the ratio of the water, the dispersant and the binder is 12. : 0.5: 3.3, the dispersant is sodium dodecylbenzenesulfonate, and the binder is polyvinylidene fluoride;

[0049] ...

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Abstract

The invention discloses a preparation method of a puncture-resistant inorganic composite coated diaphragm. In the step 1, polyvinylidene fluoride serving as a binder is dispersed more uniformly, and particles are smaller; the binder polyvinylidene fluoride in the step 2 is not well dispersed, and particles are large; in the step 3, the binder with small particles, the binder with large particles, the cross-linked polymer and the cross-linked compound are subjected to concentrated cross-linking, and the hydroxide and the four substances subjected to concentrated cross-linking have strong binding force, so that the flexibility of the puncture-resistant inorganic composite coating diaphragm is improved, and the puncture-resistant performance of the puncture-resistant inorganic composite coating diaphragm is improved. When the puncture-resistant inorganic composite coating diaphragm is subjected to external force such as puncture, the external force can be dispersed, so that relatively high puncture strength can be obtained.

Description

technical field [0001] The invention belongs to the technical field of battery diaphragms, in particular to a puncture-resistant inorganic composite coating diaphragm and a preparation method thereof. Background technique [0002] The role of the separator in the battery is very important. For power batteries, almost all NCM system batteries currently use inorganic ceramic-coated separators, and the main component of the ceramic layer is Al. 2 O 3 , This type of inorganic ceramic-coated separator has excellent thermal stability and mechanical properties, but with the continuous optimization of the industry, the requirements for inorganic ceramic-coated separators have also increased relatively. [0003] Although the inorganic ceramic-coated diaphragm has good puncture resistance, its flexibility is poor, and the puncture resistance will be greatly weakened when the inorganic ceramic-coated diaphragm is subjected to external forces such as puncture. Secondly, in terms of the...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/449H01M50/446
CPCH01M50/403H01M50/449H01M50/446Y02E60/10
Inventor 袁海朝徐锋豆赛赛苏碧海石琳琳白涛胡晓梦李钦钦
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD