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Method for preparing RuO2 coating cathode film material of super capacitor

A technology of supercapacitor and preparation process, applied in the direction of electrolytic inorganic material coating and other directions, can solve the problems of cracking, loose film, poor adhesion, etc., and achieve the effect of simple process and easy operation

Inactive Publication Date: 2009-07-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Preparation of RuO by Electrodeposition 2 When the thickness of the film exceeds 0.3 μm, cracking will occur, which reduces the adhesion between the film and the substrate. The supporting electrolyte for electrodeposition is potassium chloride. Due to the serious hydrogen evolution during the electrodeposition process, the film is loose. poor adhesion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0015] ① First, polish the 1.5cm×1.5cm tantalum foil with 600# metallographic sandpaper, degrease with acetone for 5 minutes, then wash the sample with deionized water in turn, soak in lye for 15 minutes (sodium phosphate 40g / L, hydroxide Sodium 5g / L, sodium silicate 20g / L and sodium carbonate 10g / L) degreasing at 80°C for 10 minutes; in order to improve the adhesion between the substrate and the film, electrochemical degreasing was carried out, and then ultrasonic cleaning was carried out, and then mixed acid (20mL of 40% hydrofluoric acid, 10mL of 1.4g / mL nitric acid and 15mL of 1.84g / mL sulfuric acid) for chemical polishing, and finally stored in deionized water for future use.

[0016] ② Weigh RuCl 3 ·3H 2 O and NaNO 3 Configure the solution and let it stand for several hours to make the RuCl 3 The concentration is 5mmol / L, NaNO 3 The concentration is 0.1mol / L. During the electrodeposition process, the temperature of the solution was kept at 50°C, and the current dens...

Embodiment approach 2

[0019] ① First, polish the 1.5cm×1.5cm tantalum foil with 600# metallographic sandpaper, degrease with acetone for 10 minutes, then wash the sample with deionized water in turn, soak in lye for 10 minutes (sodium phosphate 40g / L, hydroxide Sodium 5g / L, sodium silicate 20g / L and sodium carbonate 10g / L) degreasing at 70°C; in order to improve the adhesion between the substrate and the film, electrochemical degreasing was carried out, followed by ultrasonic cleaning, and then mixed acid ( 20mL of 40% hydrofluoric acid, 10mL of 1.4g / mL nitric acid and 15mL of 1.84g / mL sulfuric acid) for chemical polishing, and stored in deionized water for future use.

[0020] ② Weigh RuCl 3 ·3H 2 O and NaNO 3 Configure the solution and let it stand for several hours to make the RuCl 3 The concentration is 2mmol / L, NaNO 3 The concentration is 0.25mol / L. During the electrodeposition process, the temperature of the solution was kept at 25°C, and the current density was 30mA / cm 2 , the electrod...

Embodiment approach 3

[0024] ① First, polish the tantalum foil of 1.5cm×1.5cm with 600# metallographic sandpaper, degrease with acetone for 8 minutes, then wash the sample with deionized water in turn, soak in lye for 12 minutes (sodium phosphate 40g / L, hydroxide Sodium 5g / L, sodium silicate 20g / L and sodium carbonate 10g / L) degreasing at 75°C; in order to improve the adhesion between the substrate and the film, electrochemical degreasing was carried out, and then ultrasonic cleaning was carried out, and then mixed acid ( 20mL of 40% hydrofluoric acid, 10mL of 1.4g / mL nitric acid and 15mL of 1.84g / mL sulfuric acid) for chemical polishing, and finally stored in deionized water for future use.

[0025] ② Weigh RuCl 3 ·3H 2 O and NaNO 3 Configure the solution and let it stand for several hours to make the RuCl 3 The concentration is 5mmol / L, NaNO 3 The concentration is 0.1mol / L. During the electrodeposition process, the temperature of the solution was kept at 50°C, and the current density was 45m...

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Abstract

A preparation process for supercapacitor RuO2 coated cathode thin film material, the invention first pretreats the high-purity metal tantalum foil with a purity greater than 99.95%, polishes it with metallographic sandpaper, washes it with acetone, and then heats and soaks it with lye. Cathodic electrolytic degreasing at 70-80°C, hot washing with mixed acid, process: use acidic ruthenium chloride colloidal aqueous solution as the electrodeposition solution for electrodeposition, the concentration of ruthenium trichloride is 0.005-0.05M, NaNO30.05-0.2M, The pH is 1.85-5, the bath temperature is 35-50°C, the electrodeposition current density is 1-50mA / cm2, and the electrodeposition time is 0.5-5h; the prepared coating is heat-treated in an air atmosphere of 100-300°C. The invention has simple process and convenient operation, and the prepared tantalum-based RuO2 electrode material has a specific capacitance of 860F / g.

Description

[technical field] [0001] The invention relates to the field of electrochemical capacitors, and relates to a preparation method for supercapacitor coating electrode materials. [Background technique] [0002] Supercapacitors are also known as electrochemical capacitors, supercapacitors, supercapacitors, etc. Electrochemical capacitors (including electric double layer capacitors and supercapacitors) are new large-capacity energy storage devices based on electrochemical principles. As an energy storage device, its energy storage is achieved by using a large specific surface area porous electrode and storing energy between the diffusion double layers. Electrochemical capacitor is a new type of energy storage element between ordinary electrostatic capacitors and secondary batteries. Due to its advantages of high specific power, large specific capacity, low cost, long cycle life, high charge and discharge efficiency, and no need for maintenance and maintenance, it is widely used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/042C25D9/04
CPCY02E60/13
Inventor 甘卫平黎小辉欧定斌覃政辉
Owner CENT SOUTH UNIV
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