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Dopamine-modifying ceramic composite separator and application thereof

A ceramic composite and ceramic diaphragm technology, applied in the field of lithium-ion batteries, can solve problems such as leakage, poor uniformity, and poor wetting ability of the diaphragm substrate

Active Publication Date: 2015-11-18
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large specific surface energy of ceramic powder, it is easy to agglomerate, and its surface is generally hydrophilic, while the polyolefin film is a hydrophobic material. Therefore, from most research reports, the uniformity of ceramic powder coating Poor, there is obvious "powder falling" phenomenon, which will greatly affect the performance of ceramic separators in lithium-ion batteries
In addition, although the powder coating of the ceramic diaphragm can improve the affinity with the electrolyte, due to the poor wetting ability of the diaphragm substrate itself and the electrolyte, the existing ceramic diaphragm still has a certain risk of leakage.

Method used

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  • Dopamine-modifying ceramic composite separator and application thereof
  • Dopamine-modifying ceramic composite separator and application thereof
  • Dopamine-modifying ceramic composite separator and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The mass ratio of the synthesized alumina nanoparticles to sodium carboxymethylcellulose (CMC) and styrene-butadiene rubber (SBR) is 95:2:3 mixed powder 1g, add deionized water and acetone (3:1, v: v) 10 mL of the mixed solution, the obtained ceramic slurry was ball-milled overnight, and the mixed slurry was ultrasonically dispersed for 20 minutes, and the obtained slurry was subjected to diaphragm coating. The ceramic diaphragm is made of ordinary polyethylene (PE) diaphragm as the diaphragm base material. The resulting slurry is uniformly coated on one side of a common polyethylene (PE) separator. Use an electric heating plate to preheat at 60°C, wait for most of the solvent to volatilize, and put it into a vacuum oven to dry at 60°C overnight to completely remove the solvent and obtain a ceramic diaphragm.

[0047] Add 0.1 g of dopamine hydrochloride (DA) into 5 mL of a mixed solvent of water and ethanol (1:1, V:V), stir mechanically for 1 h, and prepare the dopamin...

Embodiment 2

[0050] Mix 1g of the synthesized silicon oxide nanoparticles and polyacrylate terpolymer latex (LA132) in a mass ratio of 90:4:6, and put a mixed solvent of deionized water and ethanol solvent (3:1, v:v) 15 mL, the obtained ceramic slurry was ball-milled overnight, and the mixed slurry was ultrasonically dispersed for 30 minutes, and the obtained slurry was subjected to diaphragm coating. The ceramic diaphragm is made of ordinary polypropylene (PP) diaphragm as the diaphragm base material. The resulting slurry was evenly coated on both sides of a common polyethylene (PP) separator. Use an electric heating plate to preheat at 60°C, wait for most of the solvent to volatilize, and put it into a vacuum oven to dry at 60°C overnight to completely remove the solvent and obtain a ceramic diaphragm.

[0051] Add 0.2 g of dopamine hydrochloride (DA) into 10 mL of a mixed solvent of water and ethanol (2:1, V:V), stir mechanically for 2 h, and prepare the dopamine-modified ceramic compo...

Embodiment 3

[0055] Mix 1 g of the synthesized magnesium oxide nanoparticles and polyacrylate terpolymer latex (LA133) in a mass ratio of 85:6:9, and put in a suitable ratio of deionized water and acetone (3:1, v:v ) mixed solvent 20mL, ball-milled the obtained ceramic slurry overnight, ultrasonically dispersed the mixed slurry for 40 minutes, and applied the obtained slurry to membrane coating. The ceramic diaphragm is made of polyvinylidene fluoride (PVDF) diaphragm as the diaphragm substrate. The resulting slurry is evenly coated on one or both sides of a polyvinylidene fluoride (PVDF) diaphragm. Use an electric heating plate to preheat at 60°C, wait for most of the solvent to volatilize, and put it into a vacuum oven to dry at 60°C overnight to completely remove the solvent and obtain a ceramic diaphragm.

[0056] Add 0.1 g of dopamine acrylamide (DMA) to 10 mL of a mixed solvent of water and ethanol (3:1, V:V), stir mechanically for 1 h, and perform dopamine acrylamide modified ceram...

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Abstract

The invention discloses a dopamine-modifying ceramic composite separator and an application thereof. The dopamine-modifying ceramic composite separator comprises an organic separator base material and a ceramic layer arranged on the surface of the separator base material in a coated mode, wherein the thickness of the ceramic layer ranges from 0.1 micrometer to 20 micrometers. The dopamine-modifying ceramic composite separator further comprises dopamine polymers grown on the surfaces and the interiors of the separator base material and the ceramic layer in an in-situ mode. The dopamine polymers are copolymers of polydopamine or 5-hydroxy- polydopamine or polydopamine acrylamide and polydopamine acrylamide. The particle size of inorganic powder in the ceramic layer ranges from 5 nanometers to 10 micrometers. The molecular weight of materials of the organic separator base material ranges from 1,000 to 100,000,000. According to the dopamine-modifying ceramic composite separator, due to the dopamine polymers, potential safety hazards caused by powder falling and liquid leaking of the ceramic layer can be effectively reduced, and the physical performance and the electrochemical performance of the separator are effectively improved; meanwhile, due to the dopamine polymers, the stability of an interface between separator electrolysis and an electrode can be improved, lithium dendrites can be effectively suppressed through the improvement of the stability of the interface, and therefore the capacity holding capacity of a battery can be easily improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a dopamine-modified ceramic composite diaphragm and an application thereof. 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 present, commercial lithium-ion batteries mainly use polyolefin diaphragm materials with micropo...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/0525H01M50/451
CPCH01M10/0525H01M50/449Y02E60/10
Inventor 赵金保石川戴建辉张鹏
Owner XIAMEN UNIV
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