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Method for preparing super capacitor electrode sheets by hydrothermal method

A technology of supercapacitors and electrode sheets, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors, etc., can solve the problems of high product price and low energy density, and achieve low cost, high repetition rate and simple operation process. Effect

Active Publication Date: 2019-08-16
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Two very major disadvantages are low energy density and high product price

Method used

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  • Method for preparing super capacitor electrode sheets by hydrothermal method
  • Method for preparing super capacitor electrode sheets by hydrothermal method
  • Method for preparing super capacitor electrode sheets by hydrothermal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1: 1mol / Lmol cobalt nitrate hexahydrate and 25ml methanol solvent are configured into cobalt nitrate hexahydrate solution, 4mmol dimethylimidazole and 25ml methanol solvent are configured into dimethylimidazole solution, after the solution is completely dissolved, the Quickly mix the dimethylimidazole solution and the cobalt nitrate hexahydrate solution, stir for 24 hours, then centrifuge the mixed solution at 3000rpm for 30 minutes, and put the centrifuged sediment into a vacuum drying oven for 12 hours at 70° to obtain ZIF- 67 powder. Put the ZIF-67 powder into the muffle furnace, calcined at 350° for 2 hours, and the heating rate is 1°min -1 , after natural cooling, the porous metal oxide cobalt tetroxide powder can be obtained. At room temperature, put 20mg of cobalt tetroxide powder and 50mg of potassium permanganate particles into the beaker, then pour 50ml of deionized water, stir for 30min to make the solution fully mixed, and then pour into 100ml of...

Embodiment 2

[0047] Embodiment 2: 1mol / Lmol cobalt nitrate hexahydrate and 25ml methanol solvent are configured into cobalt nitrate hexahydrate solution, 4mmol dimethylimidazole and 25ml methanol solvent are configured into dimethylimidazole solution, after the solution is completely dissolved, the Quickly mix the dimethylimidazole solution and the cobalt nitrate hexahydrate solution, stir for 24 hours, then centrifuge the mixed solution at 3000rpm for 30 minutes, and put the centrifuged sediment into a vacuum drying oven for 12 hours at 70° to obtain ZIF- 67 powder. Put the ZIF-67 powder into the muffle furnace, calcined at 350° for 2 hours, and the heating rate is 1°min -1 , after natural cooling, the porous metal oxide cobalt tetroxide powder can be obtained. At room temperature, put 20mg of cobalt tetroxide powder and 100mg of potassium permanganate particles into the beaker, then pour 50ml of deionized water, stir for 30min to fully mix the solution, and then pour into a 100ml polyte...

Embodiment 3

[0050] Embodiment 3: 1mol / Lmol cobalt nitrate hexahydrate and 25ml methanol solvent are configured into cobalt nitrate hexahydrate solution, 4mmol dimethylimidazole and 25ml methanol solvent are configured into dimethylimidazole solution, after the solution is completely dissolved, two Quickly mix methylimidazole solution and cobalt nitrate hexahydrate solution, stir for 24 hours, then centrifuge the stirred mixed solution at 3000rpm for 30 minutes, and put the centrifuged precipitate into a vacuum drying oven for 12 hours at 70° to obtain ZIF-67 powder. Put the ZIF-67 powder into the muffle furnace, calcined at 350° for 2 hours, and the heating rate is 1°min -1 , after natural cooling, the porous metal oxide cobalt tetroxide powder can be obtained. At room temperature, put 20mg of cobalt tetroxide powder and 150mg of potassium permanganate particles into the beaker, then pour 50ml of deionized water, stir for 30min to fully mix the solution, and then pour into a 100ml polyte...

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Abstract

The invention discloses a method for preparing super capacitor electrode sheets by a hydrothermal method. In the method, cobalt tetroxide powder particles are put into potassium permanganate solution,and the reaction time and temperature are controlled by a reaction vessel. In a high-temperature and high-pressure environment, manganese dioxide nanosheets pyrolyzed by potassium permanganate are self-assembled on the cobalt tetroxide shell to form an intermediate composite material with a core-shell structure. The powder after hydrothermal reaction is washed with de-ionized water and dried in aconstant-temperature drying box to obtain the intermediate composite material. The intermediate composite material can be prepared into super capacitor electrode sheets by smearing. Electrochemical characterization shows that the intermediate composite material has a super high discharge voltage of 1.4V under a three-electrode system and excellent performance of super capacitors. In addition, thecore-shell structure prepared by the method has the advantages of simple operation, easy control, low cost and non-toxicity.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, and relates to a method for preparing supercapacitor electrode sheets, in particular to a method for preparing supercapacitor electrode sheets by using a hydrothermal method. Background technique [0002] With the rapid development of the global economy, the excessive development and consumption of fossil energy, and the increasing environmental pollution, we urgently need to develop new energy that is efficient, environmentally friendly and sustainable. So far, batteries, fuel cells, and supercapacitors are very promising in the field of energy storage and conversion, especially supercapacitors, which have attracted widespread attention due to their high power density and long cycle life. Supercapacitors are considered as a potential energy device, a potential new energy source that can simultaneously maintain the two advantages of high output power of ordinary capacitors and high energy...

Claims

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Application Information

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IPC IPC(8): H01G11/46H01G11/86
CPCH01G11/46H01G11/86Y02E60/13
Inventor 刘启明刘刚
Owner WUHAN UNIV