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Preparation method of composite diaphragm

A technology of composite diaphragm and base film, applied in electrical components, circuits, battery pack components, etc., can solve problems such as weak thermal stability, and achieve the effect of reducing requirements and smooth coating process

Inactive Publication Date: 2019-05-03
SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the disadvantages of existing diaphragm materials, such as weak electrolyte absorption and retention capacity and poor thermal stability, the purpose of the present invention is to provide a electrolyte with strong absorption and retention capacity, high safety, low cost, and environmental protection. Preparation method of good composite diaphragm

Method used

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  • Preparation method of composite diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A preparation method of a composite diaphragm, the method comprises the steps, and its raw materials are all in parts by mass:

[0027] Step 1: Preparation of ceramic slurry: Stir and disperse 40 parts of boehmite, 50 parts of deionized water, 0.1 part of sodium carboxymethylcellulose and 1 part of styrene-acrylic emulsion for 30 minutes to obtain a ceramic slurry;

[0028] Step 2: Prepare PMMA slurry. 40 parts of PMMA, 50 parts of deionized water, 0.1 part of sodium carboxymethylcellulose and 1 part of styrene-acrylic emulsion were stirred and dispersed for 30 minutes to obtain PMMA slurry;

[0029] Step 3: Preparation of PVDF and its copolymer slurry. Stir and disperse 40 parts of polyvinylidene fluoride-hexafluoropropylene, 50 parts of deionized water, 0.1 part of sodium carboxymethyl cellulose and 1 part of styrene-acrylic emulsion for 30 minutes to obtain PVDF and its copolymer slurry;

[0030] Step 4: Coating

[0031] The ceramic slurry prepared in step 1 is coa...

Embodiment 2

[0034] A preparation method of a composite diaphragm, the method comprises the steps, and its raw materials are all in parts by mass:

[0035] Step 1: Preparation of ceramic slurry 45 parts of titanium dioxide, 70 parts of deionized water, 0.4 parts of sodium carboxymethylcellulose and 5 parts of pure acrylic emulsion were stirred and dispersed for 30 minutes to obtain a ceramic slurry;

[0036] Step 2: Prepare PMMA slurry. 45 parts of PMMA, 70 parts of deionized water, 0.4 parts of sodium carboxymethylcellulose and 5 parts of pure acrylic emulsion were stirred and dispersed for 30 minutes to obtain PMMA slurry;

[0037] Step 3: Prepare PVDF and its copolymer slurry. Stir and disperse 45 parts of polyvinylidene fluoride-hexafluoroethylene, 70 parts of deionized water, 0.4 parts of sodium carboxymethylcellulose and 5 parts of pure acrylic emulsion for 30 minutes to obtain PVDF and its copolymer slurry;

[0038] Step 4: Coating

[0039] The ceramic slurry prepared in step 1 is...

Embodiment 3

[0042] A preparation method of a composite diaphragm, the method comprises the steps, and its raw materials are all in parts by mass:

[0043] Step 1: Preparation of ceramic slurry 55 parts of calcium oxide, 80 parts of deionized water, 0.7 parts of sodium carboxymethyl cellulose and 4 parts of ethylene-vinyl acetate copolymer emulsion were stirred and dispersed for 40 minutes to obtain a ceramic slurry;

[0044] Step 2: Prepare PMMA slurry. 55 parts of PMMA, 80 parts of deionized water, 0.7 parts of sodium carboxymethylcellulose and 4 parts of ethylene-vinyl acetate copolymer emulsion were stirred and dispersed for 40 minutes to obtain PMMA slurry;

[0045] Step 3: Preparation of PVDF and its copolymer slurry Mix 55 parts of polyvinylidene fluoride-hexafluoroethylene, 80 parts of deionized water, 0.7 parts of sodium carboxymethyl cellulose and 4 parts of ethylene-vinyl acetate copolymer emulsion, stir and disperse 40min, obtain PVDF and its copolymer slurry;

[0046] Step 4:...

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Abstract

The invention discloses a preparation method of a composite diaphragm. The method comprises the steps: preparing ceramic slurry, polymethyl methacrylate (PMMA) slurry, polyvinylidene fluoride (PVDF) slurry and copolymer slurry thereof; coating the upper layer and the lower layer of a base membrane with the ceramic slurry, wherein the PMMA slurry is coated on the upper ceramic coating, and the PVDFand the copolymer slurry are coated on the lower ceramic coating, i.e., forming the composite diaphragm composed of the PMMA coating / the upper ceramic coating / a base layer / the lower ceramic coating / the PVDF and the copolymer coating thereof. The diaphragm has higher liquid absorption rate, peel strength and thermal stability.

Description

technical field [0001] The invention relates to the technical field of coated diaphragms, in particular to a method for preparing a composite diaphragm. Background technique [0002] Currently commercial lithium-ion battery separators include polypropylene film (PP), polyethylene film (PE) or multilayer composite film. The wide application of polyolefin separators shows the advantages of reasonable cost, chemical stability and self-closing performance at high temperature, but the thermal shrinkage and mechanical strength are poor. When the local temperature of the battery exceeds 160 °C, the separator is prone to lose its mechanical integrity, and a large area of ​​shrinkage will cause the positive and negative electrodes to contact, which makes the battery face the danger of burning and explosion at high temperature. [0003] PP or PE is a non-polar material, which has poor affinity with highly polar electrolyte solutions, and the liquid absorption and liquid retention cap...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/417H01M50/434H01M50/44H01M50/451H01M50/457H01M50/489H01M50/497
CPCY02E60/10
Inventor 徐健景希玮
Owner SHANGHAI SUNRISE POLYMER MATERIAL CO LTD
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