Aramid fiber polymer coated lithium ion battery membrane and preparation method thereof

A lithium-ion battery and polymer technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems affecting the wettability of electrolyte and separator, deterioration of heat resistance and mechanical properties, recycling and environmental pollution and other problems, to achieve the effect of convenient continuous production, improved wettability and environmental friendliness

Active Publication Date: 2015-10-14
CANGZHOU MINGZHU SEPARATOR TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method still has the following problems: first, the aramid fiber needs to be heated and dissolved, and this process will cause part of the aramid fiber to decompose, resulting in poor heat resistance and mechanical properties; second, the method is limited by the thermodynamic state of the slurry and the The mass transfer kinetics between the material and the coagulation liquid are jointly dominated, the influencing factors are complex, and the pore structure is difficult to control; third, the coating is composed of a dense skin layer and a loose porous sublayer, and the formation of a dense skin layer will hinder the migration of lithium ions. Affect the wetting performance of the electrolyte and the diaphragm; Fourth, the composition of the coagulation solution varies, most of which are high-concentration organic solutions, causing cost pressures and causing problems such as recycling and environmental pollution

Method used

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  • Aramid fiber polymer coated lithium ion battery membrane and preparation method thereof
  • Aramid fiber polymer coated lithium ion battery membrane and preparation method thereof
  • Aramid fiber polymer coated lithium ion battery membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Weigh 2kg of DMAC, add 0.1kg of sodium polyacrylate, stir until completely dissolved, add 4.4kg of meta-aramid polymer to the above solution, the content of aramid is 10%, the molecular weight of aramid is 80,000-100,000, stir After uniformity, add 3.35kg of isopropanol and 0.05kg of vinylpyrrolidone and vinyl acetate (PVP-VA) copolymerized adhesive sequentially while stirring, and disperse evenly to prepare aramid fiber slurry; select corona polypropylene with a thickness of 16μm The base film has a porosity of 42%. The aramid fiber slurry is coated on one side of the base film by gravure coating, and the coating speed is 15m / min. Pre-solidified for 10s in an environment with a humidity of 90%, washed with water for 10s, and dried in a three-stage oven. The temperatures of the ovens at each level were 55°C, 60°C, and 70°C. After drying, the lithium-ion battery coated with aramid polymer was obtained. diaphragm. The lithium-ion battery separator coated with the aramid ...

Embodiment 2

[0044] Weigh 2.85kg of DMF, add 0.05kg of polyvinyl alcohol powder, stir until completely dissolved, add 5kg of para-aramid polymer to the above solution, the aramid content is 13.75%, and the aramid molecular weight is 40,000-70,000. After stirring evenly, add 2kg of isopropanol and 0.05kg of vinylpyrrolidone and vinyl acetate (PVP-VA) copolymer adhesive in turn while stirring, and disperse evenly to prepare aramid fiber slurry; select a corona polymer with a thickness of 22 μm The imide base film has a porosity of 44%. The aramid slurry is coated on both sides of the base film by dip coating, and the coating speed is 5m / min. Pre-solidified for 15s in an environment with a humidity of 95%, washed with water for 15s, and dried in a three-stage oven. The temperatures of the ovens at each level were 45°C, 50°C, and 60°C. After drying, aramid polymer-coated lithium-ion batteries were obtained. diaphragm. The thickness of the lithium-ion battery separator coated with the aramid f...

Embodiment 3

[0046]Weigh 1.45kg of DMSO, add 0.05kg of polyacrylamide, stir until completely dissolved, add 7.5kg of para-aramid polymer to the above solution, the active ingredient of aramid (the active ingredient of aramid is the content contained in the polymer) The mass percentage of aramid fiber) is 12.5%, and the molecular weight of aramid fiber is 10,000-30,000. After stirring evenly, add 0.8kg of ethyl acetate and 0.2kg of vinylpyrrolidone and vinyl acetate (PVP-VA) copolymer adhesive The aramid fiber slurry was evenly dispersed to prepare the aramid fiber slurry; the polypropylene base film with a thickness of 32 μm was selected, and the porosity was 60%, and the aramid fiber slurry was coated on one side of the base film by gravure coating, and the coating speed was 30 m / min. Pre-solidified for 5s in an environment with a humidity of 95%, washed with water for 15s, and dried in a three-stage oven. The temperatures of the ovens at each level were 60°C, 65°C, and 55°C. After dryin...

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Abstract

The invention discloses an aramid fiber polymer coated lithium ion battery membrane and a preparation method thereof. The membrane comprises a lithium ion battery base membrane and a coating, wherein the single side or the two sides of the base membrane are coated with the coating, the coating thickness is 0.5-4 microns, an aramid fiber polymer is used in aramid fiber slurry, and the aramid fiber slurry is solidified in advance at the environment in which the relative humidity is more than 90% to obtain the membrane which has good mechanical performance and high temperature resistance. Meanwhile, the membrane has an opening structure, so that the wettability of electrolyte is greatly promoted, in addition, the preparation method has the characteristics of good environmentally friendly effect, low cost, simple process and the like, and is convenient for continuous production.

Description

technical field [0001] The invention relates to a lithium-ion battery diaphragm, in particular to a composite lithium-ion battery diaphragm and a preparation method thereof, belonging to the technical field of batteries. Background technique [0002] Lithium-ion batteries are widely used as power sources for various mobile devices due to their high energy density, high operating voltage, no memory effect, and long cycle life. Lithium-ion batteries usually include a positive electrode, a negative electrode, a separator and an electrolyte. As a barrier between the positive and negative electrodes, the separator plays a vital role in the performance of the lithium-ion battery. Therefore, the safety of the lithium-ion battery can be improved by improving the performance of the separator The research on safety, usability and craftsmanship has received more and more attention. At present, the separators used in lithium-ion batteries are generally polyolefin porous membranes, whos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525H01M50/403H01M50/411H01M50/414H01M50/417H01M50/44H01M50/449H01M50/454H01M50/457H01M50/491
CPCH01M10/0525H01M50/44H01M50/403H01M50/491H01M50/417H01M50/414Y02E60/10
Inventor 于中彬武跃赵中雷孙卫佳王庆通庄浩然邵培苓
Owner CANGZHOU MINGZHU SEPARATOR TECH CO LTD
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