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Non-woven cloth increasing micropore polymer diaphragm and usage as well as preparation method thereof

A microporous polymer, non-woven technology, applied in textiles and papermaking, non-woven fabrics, structural parts, etc., can solve the problems of dimensional change, battery process control difficulty, etc., to improve heat resistance, improve battery manufacturing process Effects of reliability and stability, good battery manufacturing operability

Active Publication Date: 2008-07-23
SICHUAN INDIGO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under higher air humidity, the size of the membrane will change, which brings difficulty in process control for the preparation of batteries

Method used

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  • Non-woven cloth increasing micropore polymer diaphragm and usage as well as preparation method thereof

Examples

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Effect test

preparation example Construction

[0043] 1. Preparation of aqueous polymer colloidal emulsion

[0044] In the present invention, water is used as a reaction medium, and hydrophobic monomers and hydrophilic monomers (if used) are contained in a solution containing water-soluble polymers, and graft copolymerization is initiated by an initiator to obtain a polymer colloidal emulsion.

[0045] The specific preparation method: a. add water to the water-soluble polymer, hydrophilic monomer (if used), and additives, heat and stir until completely dissolved; b. keep the temperature of the reactor constant to the required reaction temperature of 30-90°C, Add the hydrophobic monomer into the reactor once, in batches or dropwise, and add the initiator to polymerize for 4-35 hours, preferably 5-20 hours, to obtain a polymer colloidal emulsion; the initiator can also be used in the reaction Add dropwise or in portions during the process. c. The weight ratio of each raw material in the polymer colloid is: 100 parts of wate...

Embodiment 1

[0069] Embodiment 1 Preparation of non-woven fabric reinforced microporous polymer membrane of the present invention

[0070] Synthesis of the first step polymer colloidal emulsion

[0071] In this embodiment, the graft copolymerization is carried out in the water phase with hydrophilic polymer polyvinyl alcohol (PVA) 1750 and lipophilic monomer vinyl acetate (VAC) / ethyl acrylate (EA) / acrylonitrile (AN), Make the aqueous polymer colloid emulsion that is used for lithium battery separator, its copolymerization is composed of PVA: VAC: EA: AN=10: 2: 2: 5 (weight ratio, the same below), and copolymer content is 17%, and product is White opaque lotion.

[0072] The specific preparation method of the polymer colloidal emulsion is: in a four-port reaction vessel with condensed water, add 1000g of distilled water and 100g of polyvinyl alcohol (PVA) 1750, the reaction kettle is heated up to 75°C, stirred and dissolved, and the rotating speed is 100 rpm Minutes, 3 hours later, when t...

Embodiment 2

[0079] Example 2 Preparation of non-woven reinforced microporous polymer membrane of the present invention

[0080] Synthesis of the first step polymer colloidal emulsion

[0081] The reaction steps are basically the same as in Example 1, except that the lipophilic monomer ethyl acrylate (EA) is replaced by acrylamide with good hydrophilicity, and its copolymer composition is PVA:VAC:AM:AN=10:2: 1:8.

[0082] The specific preparation method of the polymer emulsion is as follows: all monomers are added in a one-time feeding method, the material concentration is adjusted to about 13%, the initiator is directly added, and the reaction is completed in 12 hours to obtain the polymer colloid emulsion.

[0083] The second step slurry equipment

[0084] The proportion of the filler added is the same as in Example 1, and the materials are titanium dioxide and benzyl alcohol, which are ball milled for 5 hours.

[0085] The third step of coating

[0086] With embodiment 1, prepared f...

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Abstract

The invention relates to a non-woven fabric enhanced micropore polymer diaphragm material for a non aqueous electrolyte battery energy accumulator and method for preparation, which belongs to the manufacturing field of non aqueous electrolyte energy accumulators which are a battery and a capacitor. The non-woven fabric enhanced micropore polymer diaphragm is characterized in that the diaphragm comprises polymeric colloid emulsion which are copolymerized by 100 parts of water-soluble polymer, 30-500 parts of hydrophobic monomer, 0-200 parts of hydrophilic monomer and 1-5 parts of initiator. According to the 100 percent of the content of solids in polymer colloid emulsion, 0-100 percent of inorganic filler and 20-100 percent of plasticizer are added, obtained slurry is coated on the two surfaces of the non-woven fabric, and the non-woven fabric enhanced micropore polymer film is dried and obtained. The diaphragm has excellent heat resistance, excellent mechanical strength and low produce cost, is applied for a maintaining power, has higher safety and long cycle service life, and is friendly to the environment.

Description

technical field [0001] The invention relates to a diaphragm material used for energy storage devices such as non-aqueous electrolyte batteries and a preparation method thereof, and belongs to the field of manufacturing energy storage devices such as batteries and capacitors. Background technique [0002] Microporous polymer separator is one of the three indispensable materials for the manufacture of non-aqueous electrolyte energy storage devices such as lithium-ion batteries, metal lithium secondary batteries, supercapacitors, etc. It must maintain ion conduction and The positive and negative electrodes inside the battery are separated from each other, so the material properties, microporous structure, and physical and chemical properties of the microporous polymer membrane are closely related to the electrical performance, safety, and cycle life of the lithium-ion battery. The diaphragms used in commercialized non-aqueous electrolyte energy storage devices are mainly microp...

Claims

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Application Information

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IPC IPC(8): H01M2/16D04H13/00D04H1/54D06N3/00H01M50/411H01M50/414
CPCD04H1/42D04H1/4309D04H1/435D04H1/4334D04H1/4291D04H1/43H01M2/162D06N7/00D06N3/0011D06N2209/142D06N2201/0254D06N2201/0263D06N2201/02D06N3/0063D06N2205/023D06N2209/141D06N2201/0218D06N2201/0245D06N2209/1621Y02E60/10H01M50/44H01M50/414H01G9/02C08J5/22
Inventor 邓正华潘中来王璐王凯邓佳闽李仁贵杜鸿昌高建东索继栓
Owner SICHUAN INDIGO TECH CO LTD
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