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Preparation method of oily polymer coated diaphragm

A polymer and oil-based technology, which is applied in the field of preparation of oil-based polymer-coated diaphragms, can solve the problems of increased air permeability of the diaphragm, and achieve the effects of inhibiting the increase of air permeability, high mechanical strength, and strong adsorption and liquid retention properties

Inactive Publication Date: 2019-10-25
高芳
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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 overcome the defects in the prior art, and to provide a preparation method of an oily polymer coated diaphragm, which can effectively solve the increase in the gas permeability of the diaphragm caused by the coating, and can effectively solve the problem of Adhesion with the pole piece to ensure the conductivity and safety of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for preparing an oily polymer coated diaphragm, comprising the following steps:

[0022] 1) Preparation of oily mixed slurry: First mix 1200g of oily solvent NMP with 0% ceramic powder and stir evenly, then add 6g (P(MMA-co-MAH)) and stir evenly, then press (P(MMA-co-MAH) ): PVDF-HFP=1:2 Add PVDF-HFP and stir evenly. After ball milling for 0.5-2h to mix the slurry evenly, add 80g pore-forming agent and stir evenly to get the final oily polymer slurry.

[0023] 2) Coating: The oily mixed slurry prepared in step 1) is coated on one side of 12uPE to form an oily coating with a thickness of 4u and a surface density of 40-90°C in an oven After drying, the polymer PE / P (MMA-co-MAH / PVDF-HFP) coated separator was obtained.

Embodiment 2

[0025] A preparation method for an oily polymer coated diaphragm, comprising the following steps:

[0026] Step 1. Preparation of oily mixed slurry: first mix and stir the oily solvent and ceramic powder evenly, then add modified PMMA and stir evenly, then add PVDF and its copolymer and stir evenly, and mix the slurry evenly after ball milling for 0.5h , and then add a pore-forming agent and stir evenly to obtain the final oily polymer slurry.

[0027] Step 2, coating: apply the oily mixed slurry prepared in step 1 on one or both sides of the base film by dip coating, gravure coating, spray coating, and spot coating to form an oily coating, and the base film The membrane is PE, and after drying in an oven at 40°C, the polymer-modified PMMA / PVDF and its copolymer ceramic-coated separator are obtained.

[0028] The oily solvent in step 1 is NMP, DMAC.

[0029] The oily solvent in step 1 is NMP, and its content is: 65%, %. Since NMP is a low toxicity, volatile organic solvent ...

Embodiment 3

[0037] A preparation method for an oily polymer coated diaphragm, comprising the following steps:

[0038] Step 1. Preparation of oily mixed slurry: first mix and stir the oily solvent and ceramic powder evenly, then add modified PMMA and stir evenly, then add PVDF and its copolymer and stir evenly, and mix the slurry evenly after ball milling for 1.5h , and then add a pore-forming agent and stir evenly to obtain the final oily polymer slurry.

[0039] Step 2, coating: the oily mixed slurry prepared in step 1 is coated on one or both sides of the base film by dip coating, gravure coating, spray coating, and spot coating to form an oily coating. The membrane is PP, and after drying in an oven at 65°C, a polymer-modified PMMA / PVDF and its copolymer ceramic-coated separator can be obtained.

[0040] The oily solvent in step 1 is acetone, tetrahydrofuran.

[0041] The oily solvent in step 1 is NMP, and its content is: 82%. Since NMP is a low toxicity, volatile organic solvent t...

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Abstract

The invention discloses a preparation method of an oily polymer coated diaphragm, and belongs to the technical field of preparation of lithium ion battery diaphragms. The method comprises the following steps: 1, preparation of oily mixed slurry: firstly, uniformly mixing and stirring an oily solvent and ceramic powder, then adding modified PMMA and performing uniform stirring, adding PVDF and a PVDF copolymer and performing uniformly stirring, and then carrying out ball milling for 0.5-1 hour to obtain the oily mixed slurry, adding a pore-forming agent into the uniformly mixed slurry for 2 hours, and performing uniform stirring to obtain final oily polymer slurry; 2, coating: coating one side or two sides of a base film with the oily mixed slurry prepared at the step 1 in a dip-coating, intaglio coating, spraying and spot-coating manner to form an oily coating, and carrying out drying in a drying oven at the temperature of 40-90 DEG C to obtain the polymer modified PMMA / PVDF and the copolymer ceramic coated diaphragm thereof. The method is simple in process, high in production efficiency and compatible with existing production equipment, and the large-scale production can be achieved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery diaphragm preparation, and relates to a preparation method of an oily polymer-coated diaphragm. Background technique [0002] Since lithium-ion batteries were successfully developed in the early 1990s, due to their advantages such as high energy density, high voltage, small self-discharge, no memory effect, wide operating temperature range, long cycle life and environmental friendliness, it has become the second battery after nickel-metal hydride batteries. The latest generation of new green and environmentally friendly high-energy batteries is a new type of high-energy battery successfully developed in the 20th century. With its rapid development, its application has penetrated into many fields such as civilian and military applications, including electric vehicles, mobile phones, notebook computers, video cameras, digital cameras, etc. Therefore, lithium-ion batteries have highe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/403H01M50/446Y02E60/10
Inventor 高保清舒均国陈立新高芳
Owner 高芳
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