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Ceramic diaphragm with dopamine-containing composite binder and application of ceramic diaphragm with dopamine-containing composite binder in lithium ion battery

A technology of ceramic diaphragm and adhesive, which is applied in the direction of battery pack components, circuits, electrical components, etc., and can solve the problems of infiltration of ceramic powder and diaphragm matrix.

Inactive Publication Date: 2017-12-22
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, so it cannot be used alone as a binder

Method used

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  • Ceramic diaphragm with dopamine-containing composite binder and application of ceramic diaphragm with dopamine-containing composite binder in lithium ion battery
  • Ceramic diaphragm with dopamine-containing composite binder and application of ceramic diaphragm with dopamine-containing composite binder in lithium ion battery
  • Ceramic diaphragm with dopamine-containing composite binder and application of ceramic diaphragm with dopamine-containing composite binder in lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Mix 1g of aluminum oxide nanoparticles, sodium carboxymethyl cellulose (CMC) and styrene-butadiene rubber (SBR) in a mass ratio of 95:2:3, put in deionized water and ethanol (1:2, v:v ) mixed solution 10ml, stirred the obtained ceramic slurry overnight, ultrasonically dispersed the mixed slurry for 20min, adjusted the pH to 8.5, added 0.75g of dopamine, mixed evenly, and applied 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 or both sides of a common polyethylene (PE) separator. Aged at 25°C for 8 hours, washed with a solvent to remove impurities, and dried to remove the solvent to obtain a modified ceramic diaphragm.

Embodiment 2

[0052] Put 1 g of mixed powder of silica nanoparticles, gelatin and polyvinyl alcohol (PVA) in a mass ratio of 90:4:6, put 10 ml of mixed solution of deionized water and ethanol (1:3, v:v), and mix the obtained Stir the ceramic slurry overnight, ultrasonically disperse the mixed slurry for 20 minutes, adjust the pH to 8.0, add 0.4 g of dopamine, mix well, and apply the obtained slurry to membrane coating. The ceramic diaphragm is made of ordinary polypropylene (PP) diaphragm as the diaphragm base material. The resulting slurry is uniformly coated on one or both sides of a common polyethylene (PE) separator. Aged at 35°C for 10h, washed with a solvent to remove impurities, dried to remove the solvent, and obtained a modified ceramic diaphragm

Embodiment 3

[0054] Put titanium dioxide nanoparticles and polyacrylate terpolymer latex (LA132, LA133) in a mass ratio of 85:6:9 mixed powder 1g into a mixed solution of deionized water and ethanol (2:1, v:v) 15ml, stir the obtained ceramic slurry overnight, ultrasonically disperse the mixed slurry for 20min, adjust the pH to 9.0, add 0.2g dopamine, mix well, and apply the obtained slurry to membrane coating. The ceramic diaphragm is made of polyamide (PI) diaphragm as the diaphragm base material. The resulting slurry is uniformly coated on one or both sides of a common polyethylene (PE) separator. Aged at 50°C for 24 hours, washed with a solvent to remove impurities, dried to remove the solvent, and obtained a modified ceramic diaphragm

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Abstract

The invention discloses a ceramic diaphragm with a dopamine-containing composite binder and application of the ceramic diaphragm with the dopamine-containing composite binder in a lithium ion battery, and relates to the lithium ion battery. The ceramic diaphragm with the dopamine-containing composite binder comprises a diaphragm base material, wherein the surface of the diaphragm base material is coated with a protective layer; the protective layer is prepared from ceramic powder and the dopamine-containing composite binder. A method of preparing the ceramic diaphragm comprises the following steps: mixing inorganic particle powder, a water-based solvent and an adhesive, adjusting the pH to 6 to 12, adding dopamine, and uniformly mixing the materials, thus obtaining ceramic slurry; coating a single layer or two layers of surfaces of the diaphragm base material with the obtained ceramic slurry, leaving the diaphragm base material to stand for aging till the dopamine monomer is completely polymerized, washing the diaphragm base material with the water-based solvent to remove impurities, and drying the diaphragm base material to remove the solvent, thus obtaining the ceramic diaphragm with the dopamine-containing composite binder. The ceramic diaphragm with the dopamine-containing composite binder can be applied to the lithium ion battery.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a ceramic diaphragm containing a dopamine composite binder and its application in the lithium ion battery. 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 microporous...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/446
CPCH01M50/446Y02E60/10
Inventor 赵金保张鹏彭龙庆戴建辉
Owner XIAMEN UNIV
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