Composite coating layer and manufacturing method thereof and electrode material

A composite coating and composite material technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, protection/regulation of hybrid/electric double layer capacitors, etc., can solve problems such as limited applications

Active Publication Date: 2019-08-02
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rapid self-discharge effect greatly limits its application as a continuous energy storage device

Method used

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  • Composite coating layer and manufacturing method thereof and electrode material
  • Composite coating layer and manufacturing method thereof and electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Step 1: Take 0.5 mg / mL graphene oxide aqueous dispersion (graphene oxide sheet size is 500-5000 μm), add 10wt% polyvinyl alcohol (PVA) aqueous solution to form graphene oxide with a mass ratio of 1: 10 of the composite material dispersion, and magnetically stirred at room temperature for 1 hour to fully disperse the two.

[0052] Step 2: Scrape-coat the composite material dispersion on the surface of the electrode with a thickness of 2000 nm. Spray 1% glutaraldehyde aqueous solution on the surface of the coating to cross-link the dispersion of the composite material.

[0053] Step 3: Take a zinc plate and place it on the surface of the film, seal it and bake it in an oven at 50 degrees Celsius for 3 hours.

[0054] Step 4: Remove the zinc plate and freeze-dry the coated electrode.

[0055] The self-discharge performance of the prepared coating treated electrode (modified) compared with the non-coated treated (unmodified) electrode in phosphoric acid / PVA electrolyte is...

Embodiment 2

[0057]Step 1: Take the graphene oxide water dispersion of 1mg / mL concentration, (graphene oxide sheet size is 100-1000 μm), add 10wt% polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) solution, solvent is Acetone to form a composite material dispersion with a graphene oxide mass ratio of 1:5, and ultrasonic treatment for 2 hours at room temperature to fully disperse the two.

[0058] Step 2: Scrape-coat the composite material dispersion with a thickness of 1000 nm on the surface of the electrode by spraying.

[0059] Step 3: Take an iron plate and place it on the surface of the film, seal it and place it at room temperature for 10 hours.

[0060] Step 4: Remove the iron plate, and dry the coated electrode at 60 degrees Celsius for 6 hours. The self-discharge rate of the prepared coated electrode methylimidazole bistrifluoromethanesulfonimide salt (EMIMTFSI) ionic liquid was significantly lower than that of the untreated sample.

Embodiment 3

[0062] Step 1: Take 0.7 mg / mL graphene oxide aqueous dispersion (graphene oxide sheet size is 500-5000 μm), add 10wt% polyvinyl alcohol (PVA) aqueous solution to form graphene oxide with a mass ratio of 1: 7 composite material dispersion, and magnetically stirred at room temperature for 1 hour to fully disperse the two.

[0063] Step 2: Scrape-coat the composite material dispersion on the surface of the electrode with a thickness of 1500 nm. Spray 1% glutaraldehyde aqueous solution on the coating surface to cross-link the composite material.

[0064] Step 3: Take a tin plate and place it on the surface of the film, seal it and bake it at room temperature for 10 hours.

[0065] Step 4: Remove the tin plate and freeze-dry the coated electrode. The self-discharge rate of the prepared coated electrode in PVA / potassium hydroxide (KOH) electrolyte was significantly lower than that of the untreated sample.

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Abstract

The invention discloses a composite coating layer and a manufacturing method thereof and an electrode material. The composite coating layer comprises a first coating layer and a second coating layer.The first coating layer comprises a polymer carrier and graphene oxide dispersed in the polymer carrier. The second coating layer comprises a polymer carrier, reduced graphene oxide and a metal oxide.The reduced graphene oxide and the metal oxide are dispersed in the polymer carrier. The reduced graphene oxide in the second coating layer cuts off a part of the metal oxide so that the surface is positively charged, and the graphene oxide surface contained in the first coating layer is negatively charged by the presence of oxygen-containing groups and the charge distribution difference resultsin a certain potential difference. When the composite coating layer is applied to the electrode, the composite coating layer is located between the two electrodes to counteract the self-discharge of the original supercapacitor caused by the potential difference, and thus the self-discharge effect of the capacitor can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of electrode materials, in particular to a composite coating, a manufacturing method thereof, and an electrode material. Background technique [0002] Capacitors are one of the electronic components widely used in electronic equipment, and are widely used in DC blocking, coupling, bypass, filtering, tuning loops, energy conversion, control, etc. in circuits. With the rapid development of electronic information technology, the upgrading speed of digital electronic products is getting faster and faster. The production and sales of consumer electronic products, mainly flat-panel TVs, notebook computers, digital cameras and other products, continue to grow, which drives the growth of the capacitor industry. [0003] With the continuous development of capacitor materials in recent years, some supercapacitors have the potential to be used as power sources in some fields. However, the rapid self-discharge effect g...

Claims

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Application Information

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IPC IPC(8): H01G11/14H01G11/30H01G11/46H01G11/26H01G11/86
CPCH01G11/14H01G11/26H01G11/30H01G11/46H01G11/86Y02E60/13
Inventor肖涵刘兆平孙敏潘子昂
OwnerNINGBO GRAPHENE INNOVATION CENT CO LTD