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Isolating membrane of electrochemical device and preparation method and application of isolating membrane

An electrochemical and isolating membrane technology, applied in the field of electrochemistry, can solve the problems of increased manufacturing cost, low production efficiency, and environmentally harmful processes.

Inactive Publication Date: 2016-11-16
SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of isolation film needs to use NMP, ethanol and other organic substances as solvents for multiple coatings during coating coating, which is harmful to the environment and the process is complicated. More importantly, its adhesion is not strong and cannot meet the hardness requirements of the battery. Require
[0004] Also there is disclosed a kind of oil-based coating separator with porous active coating, which coats the mixture of oily polymers on the porous substrate to form a porous active coating. This coating adopts dip coating process, coating Slow speed and low production efficiency
In addition, the use of a large amount of organic solvents will seriously pollute the environment and greatly increase the manufacturing cost

Method used

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  • Isolating membrane of electrochemical device and preparation method and application of isolating membrane

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preparation example Construction

[0036] The invention provides a method for preparing an electrochemical device isolation film, the method comprising the following steps:

[0037] In the first step, the raw materials forming the high-viscosity polymer coating provided by the present invention are uniformly mixed with a solvent to make a high-viscosity polymer slurry;

[0038] In the second step, the high-viscosity polymer slurry is coated on at least one face of the porous substrate or the porous substrate having at least one inorganic coating;

[0039] In the third step, the coated membrane is dried to obtain an electrochemical device isolation membrane.

[0040] In the first step of the above-mentioned method, use deionized water as solvent to make high-viscosity polymer slurry, with the total weight of the slurry made, the consumption of deionized water is 20-99wt%, preferably 60-95wt %.

[0041] In the first step above, when the raw materials are mixed with the solvent, the order of adding the various raw...

Embodiment 1

[0080] The process of positive electrode sheet, negative electrode sheet, non-aqueous electrolyte, and cell forming is the same as that of Comparative Example 1, but the separator is prepared by the following method:

[0081] Add 40 parts by mass of high-viscosity polymer (mass fraction is 30%, solvent is water, core material: polyacrylic acid, shell material: polymethacrylic acid), 0.2 mass part of polyether and 30 mass parts of deionized water In the dual-type star mixer, mix at room temperature for 0.5 hour to obtain a high-viscosity polymer slurry;

[0082] Extrusion coating method is used to coat the polypropylene porous substrate on both sides, and the coating speed is 20m / min;

[0083] It was dried in a three-stage oven (the length of each section is 3 meters, and the temperature of each section is 38°C, 40°C, and 40°C respectively). After drying, the thickness of one side of the obtained coating was measured to be 0.5 μm.

Embodiment 2

[0085] The process of positive electrode sheet, negative electrode sheet, non-aqueous electrolyte, and cell forming is the same as that of Comparative Example 1, but the separator is prepared by the following method:

[0086] 20 parts by mass of high-viscosity polymer (mass fraction is 20%, solvent is water, core material: polyvinylpyrrolidone, shell material: styrene-butadiene rubber) and polyacrylic acid are added in a dual-type star mixer, and stirred at room temperature for 30min, Then 5 parts by mass of polyethylene glycol and 50 parts by mass of deionized water were mixed at room temperature for 1.5 hours to obtain a high-viscosity polymer slurry;

[0087] The polypropylene / polyethylene / polypropylene three-layer composite porous substrate is coated on one side by gravure coating, and the coating speed is 10m / min;

[0088] It is dried in a three-stage oven (each section is 3 meters long, and the temperature of each section is 70°C, 65°C, and 65°C respectively). After dryi...

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Abstract

The invention discloses an isolating membrane of an electrochemical device and a preparation method and application of the isolating membrane. A coating of the isolating membrane comprises high-viscosity polymer particles and additives and micropores distributed among the particles.

Description

technical field [0001] The invention relates to the field of electrochemical technology, in particular to an electrochemical device isolation film with good performance and a preparation method thereof. Background technique [0002] Traditional electrochemical devices (such as lithium-ion secondary batteries) mostly use polyolefin porous substrates as separators, but this separator will shrink greatly when heated, so it is easy to cause a short circuit between the positive and negative electrodes and cause safety accidents. In order to solve this problem, people in the industry try to use binders to coat inorganic particles on porous substrates to produce organic / inorganic composite porous separators containing inorganic coatings, hoping to reduce the thermal stability of separators through the thermal stability of inorganic particles. Heat shrinkage, and organic materials to increase the adhesion between the separator and the positive and negative interfaces, so as to preve...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/409H01M50/411H01M50/42H01M50/423H01M50/426H01M50/429H01M50/443
CPCH01M50/443H01M50/42H01M50/426H01M50/429H01M50/423Y02E60/10
Inventor 程跃陈永乐王伟强何方波苏晓明张祖来
Owner SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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