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Composite diaphragm and preparation method thereof

A composite diaphragm and composite coating technology, applied in structural parts, electrical components, battery pack components, etc., can solve the problems of battery safety, easy breakdown, and thermal shrinkage of the diaphragm, achieving good safety and high hardness. , the effect of high breakdown strength

Pending Publication Date: 2022-02-18
惠州锂威电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing batteries are easily broken down when used at high rates, and the diaphragm shrinks when heated, which leads to battery safety issues

Method used

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  • Composite diaphragm and preparation method thereof
  • Composite diaphragm and preparation method thereof
  • Composite diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 2 As shown, weigh 1 part of pure water in parts by weight, 1 part of sodium carboxymethyl cellulose, 1 part of sodium lauryl sulfate, 60 parts of polyvinylidene fluoride (PVDF), and the molecular weight of polyvinylidene fluoride is 1200000 , and added to 15 parts of organic solvent N-methylpyrrolidone (NMP) according to the steps for stirring and dispersing, the stirring speed was 30R, the dispersion speed was 1500R, and the time was 30min to obtain the premixed solution;

[0032]Weigh 5 parts of barium titanate (BT) and 10 parts of polymethyl methacrylate (PMMA) in parts by weight, add them to the stirring tank for stirring, the stirring speed is 20R, and add 15 parts of organic solvent N-methyl Pyrrolidone (NMP), after mixing evenly, add the premixed solution to stir and disperse, the stirring speed is 30R, the dispersion speed is 2000R, and the time is 60min; add 22 parts of alumina to the above semi-finished product solution to stir and disperse, th...

Embodiment 2

[0035] The difference from Example 1 is that the ratio of parts by weight of the polar substance 1, the heat-resistant polymer 2, and the compatible polymer 3 is 5:70:10.

[0036] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0038] The difference from Example 1 is that the weight-number ratio of the polar substance 1, the heat-resistant polymer 2, and the compatible polymer 3 is 5:90:10.

[0039] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of diaphragms, and particularly relates to a composite diaphragm and a preparation method thereof.The composite diaphragm comprises a base membrane and a composite coating arranged on at least one side face of the base membrane, and the composite coating comprises a polar substance and a heat-resistant polymer. The composite diaphragm provided by the invention has the advantages of high breakdown strength, high ion conductivity, high heat resistance, high hardness and good safety.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a composite membrane and a preparation method thereof. Background technique [0002] Lithium-ion battery energy storage has high energy density, wide commercial application, declining unit cost, and mature technology. As a result, lithium-ion battery energy storage has become the dominant position in global electrochemical energy storage. With the further integration of energy into the power grid, the continuous improvement of electrochemical energy storage technology, the application of energy storage on the power generation side will be further expanded, and the high-performance lithium-ion battery has attracted more and more attention. [0003] The four key materials of lithium-ion batteries are positive electrode material, negative electrode material, electrolyte and diaphragm. The main function of the separator is to isolate the positive and negative electrode...

Claims

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Application Information

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IPC IPC(8): H01M50/449H01M50/446H01M50/417H01M50/434H01M50/403
CPCH01M50/449H01M50/446H01M50/417H01M50/434H01M50/403Y02E60/10
Inventor 赖旭伦
Owner 惠州锂威电子科技有限公司