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Polymer-modified ceramic-coated composite separator and application thereof

A technology of ceramic composite and ceramic diaphragm, applied in the field of lithium ion battery, can solve the problems of liquid leakage, poor wettability of diaphragm substrate, affecting the performance of ceramic diaphragm, etc.

Active Publication Date: 2015-12-16
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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  • Polymer-modified ceramic-coated composite separator and application thereof
  • Polymer-modified ceramic-coated composite separator and application thereof
  • Polymer-modified ceramic-coated 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) Mix 10 ml of the solution, ball mill the obtained ceramic slurry overnight, ultrasonically disperse the mixed slurry for 20 minutes, and apply the obtained slurry to membrane 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 0.2 g of methyl methacrylate (MMA) into 5 ml of a mixed solvent of nitrogen-methylpyrrolidone and acetone (1:1, V:V), stir mechanically for 10 h, and perform membrane coating ...

Embodiment 2

[0051] 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) 15ml, 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.

[0052] Add 0.2 g of methyl methacrylate (MMA) into 10 mL of a mixed solvent of water and ethanol (10:1, V:V), stir mechanically for 5 h, and perform methyl methacrylate modified ceramic ...

Embodiment 3

[0056] 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.

[0057] Add 0.5 g of biphenyltetracarboxylic dianhydride (BPDA) and 0.5 g of p-phenylenediamine (PDA) into 10 ml of a mixed solvent of nitrogen-methylpyrrolidone and acetone (5:1, V...

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Abstract

The invention discloses a polymer-modified ceramic-coated composite separator and an application thereof. The polymer-modified ceramic-coated composite separator comprises an organic separator base material, a ceramic layer and polymers, wherein the ceramic layer coats the surface of the separator base material and is 0.1-20 microns in thickness; the polymers grow in situ on the surfaces of the separator base material and the ceramic layer and inside the separator base material and the ceramic layer; the polymers are polymethyl methacrylate, polyvinylidene fluoride-perfluoropropylene, polyacrylonitrile, polyimide, polyether amide, or polyethylene oxide and the like ; the particle size of inorganic powder in the ceramic layer is 5nm to 10 microns; and the molecular weight of the material of the organic separator base material is 1,000-100,000,000. According to the polymer-modified ceramic-coated composite separator disclosed by the invention, due to the presence of the polymers, and the potential safety hazards caused by dusting and liquid leakage of the ceramic layer can be effectively reduced; the physical property and the electrochemical properties of the separator are effectively improved; meanwhile, due to the presence of the polymers, the interface stability between a separator electrolyte and an electrode can also be improved; and generation of lithium dendrites can be effectively suppressed by improvement of the interface stability. Therefore, improvement of the capacity retention ability of a battery is facilitated.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a polymer-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 micropor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525H01M50/417H01M50/434H01M50/451H01M50/457H01M50/489
CPCH01M10/0525H01M50/449Y02E60/10
Inventor 赵金保石川戴建辉张鹏
Owner XIAMEN UNIV
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