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Method for preparing modified ceramic diaphragm through dopamine compound adhesive and application thereof

A technology of binder preparation and ceramic diaphragm, which is applied in the field of electrochemistry, can solve the problems that the ceramic powder and the diaphragm matrix cannot be well infiltrated, affecting the use effect, etc.

Inactive Publication Date: 2017-05-10
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polydopamine is insoluble in solvents such as water and ethanol, and cannot be well infiltrated with ceramic powder and diaphragm substrate, which affects its use effect

Method used

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  • Method for preparing modified ceramic diaphragm through dopamine compound adhesive and application thereof
  • Method for preparing modified ceramic diaphragm through dopamine compound adhesive and application thereof
  • Method for preparing modified ceramic diaphragm through dopamine compound adhesive and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Mix 0.75g of dopamine hydrochloride, 0.2g of sodium carboxymethylcellulose (CMC), 0.3g of styrene-butadiene rubber (SBR), 10ml of a mixed solution (water-based solvent) of deionized water and ethanol (1:1, v:v) Evenly, adjust the pH to 8.5 to obtain a composite binder.

[0054] Put alumina nanoparticles (300nm in particle size) and 1 g of the above-mentioned composite binder in a solid content mass ratio of 95:5 into 10 ml of a mixed solution of deionized water and ethanol (1:1, v:v), Mix to obtain ceramic slurry.

[0055] Ceramic diaphragms were fabricated using commercial polyethylene (PE) diaphragms as the diaphragm substrate. The obtained slurry is uniformly coated on one or both sides of a common polyethylene (PE) separator to form a modified ceramic layer with a thickness of 3um. Place and age at 10-100°C for 8 hours to allow dopamine to polymerize completely, wash away impurities with a water-based solvent, and dry to remove the solvent to obtain a modified cer...

Embodiment 2

[0062] Weigh 10 parts by weight of dopamine hydrochloride and dissolve it in 100 parts by weight of deionized water, adjust the pH to 8.8, and react at room temperature for 10 h. Filter, wash, and ball mill for 12 hours to obtain polydopamine nanoparticles with a particle size of 500 nm.

[0063] Weigh 50 parts by weight of the polydopamine nanoparticles, 25 parts by weight of sodium carboxymethylcellulose, and 25 parts by weight of styrene-butadiene rubber, and disperse them in 1000 parts by weight of deionized water. get composite binders.

[0064] Weigh 20 parts by weight of the composite binder and 50 parts by weight of nano-alumina particles (with a particle size of 300 nm), disperse them in 300 parts by weight of a water-based solvent, and mix them uniformly to obtain a ceramic slurry.

[0065] Ceramic diaphragms were fabricated using commercial polyethylene (PE) diaphragms as the diaphragm substrate. The obtained slurry is evenly coated on one or both sides of a comme...

Embodiment 3

[0068] Mix 0.5g of dopamine hydrochloride, 0.5g of polyacrylate terpolymer latex (LA132, LA133), 10ml of a mixed solution of deionized water and ethanol (2:1, v:v) to obtain a composite binder.

[0069] Silica nanoparticles (particle size is 100nm) and the above composite binder according to the ratio of solid content mass ratio 90:10 1g, put deionized water and acetone 2:1, v:v) mixed solution 10ml, Mix to obtain ceramic slurry.

[0070] The ceramic diaphragm is made of ordinary polypropylene (PP) diaphragm as the diaphragm base material. The resulting slurry is evenly coated on one or both sides of a common polyethylene (PP) separator to form a modified ceramic layer with a thickness of 2um. Putting it into an alkaline atmosphere with pH=8 to age for 5 hours, washing away impurities with a solvent, drying to remove the solvent, and obtaining a modified ceramic diaphragm.

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Abstract

The invention discloses a method for preparing a modified ceramic diaphragm through a dopamine compound adhesive. The method comprises the following steps: compounding dopamine or polydopamine nanoparticles with an aqueous adhesive to form a compound adhesive, mixing the compound adhesive, nano ceramic particles and a water-based solvent, then coating the mixture on an organic microporous diaphragm substrate to form a modified ceramic layer, thereby obtaining the modified ceramic diaphragm, namely the nano ceramic particles are tightly adhered to the surface of the diaphragm substrate due to good infiltration and adhesion of the aqueous adhesive; meanwhile, through polydopamine, the thermal stability and the mechanical performance are improved; positive and negative electrodes are effectively blocked, so that the short circuit is avoided; the cycle performance of the battery using the modified ceramic diaphragm prepared by the method is improved.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to the modification of a ceramic diaphragm by a dopamine composite binder and the application of the modified ceramic diaphragm in chemical power systems such as lithium ion batteries. Background technique [0002] As a chemical power system with high energy density, high output voltage, no memory effect, excellent cycle performance, and environmental friendliness, lithium-ion battery has good economic benefits, social benefits and strategic significance, and has been widely used in mobile communications, Digital products and other fields, and it is very likely to become the most important power supply system in the field of energy storage and electric vehicles. [0003] In lithium-ion batteries, the separator mainly plays the role of preventing positive and negative electrodes from contacting and allowing ion conduction, and is an important part of the battery. At prese...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/403H01M50/411H01M50/446H01M50/449Y02E60/10
Inventor 赵金保张鹏彭龙庆戴建辉
Owner XIAMEN UNIV
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