Asymmetric super capacitor with super long cycle stability and preparation method thereof

A supercapacitor and cycle stability technology, which is applied in the manufacture of hybrid/electric double layer capacitors, electrolytic capacitors, hybrid capacitor electrodes, etc., can solve the problems of poor cycle stability of asymmetric capacitors, and achieve easy industrial application, small internal resistance, The effect of simple preparation process

Inactive Publication Date: 2016-06-01
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an asymmetric supercapacitor with ultra-long cycle stability and its preparation method for the problem of poor cycle stability of asymmetric capacitors in ionic liquids

Method used

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  • Asymmetric super capacitor with super long cycle stability and preparation method thereof
  • Asymmetric super capacitor with super long cycle stability and preparation method thereof
  • Asymmetric super capacitor with super long cycle stability and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Loading reduced graphene oxide with 10wt% RuO 2 , graphite powder and polytetrafluoroethylene emulsion are mixed uniformly at 85wt%, 15wt%, and 5wt%, and then coated on the foamed nickel sheet, and the foamed nickel sheet coated with the electrode material is rolled and dried and then cut into an electrode sheet; three-electrode system The middle electrolyte is 1-ethyl-3 methylimidazolium tetrafluoroborate ionic liquid.

[0037] From image 3 It is known that the specific capacitance measured by the electrode sheet in this example is 81F / g at a current density of 1A / g.

Embodiment 2

[0039] Loading reduced graphene oxide with 20wt% RuO 2 , graphite powder and polytetrafluoroethylene emulsion are mixed uniformly at 85wt%, 15wt%, and 5wt%, and then coated on the foamed nickel sheet, and the foamed nickel sheet coated with the electrode material is rolled and dried and then cut into an electrode sheet; three-electrode system The middle electrolyte is 1-ethyl-3 methylimidazolium tetrafluoroborate ionic liquid.

[0040] The specific capacitance measured by the electrode sheet in this example is 107F / g at a current density of 1A / g.

Embodiment 3

[0042] Loading reduced graphene oxide with 30wt% RuO 2 , graphite powder and polytetrafluoroethylene emulsion are mixed uniformly at 85wt%, 15wt%, and 5wt%, and then coated on the foamed nickel sheet, and the foamed nickel sheet coated with the electrode material is rolled and dried and then cut into an electrode sheet; three-electrode system The middle electrolyte is 1-ethyl-3 methylimidazolium tetrafluoroborate ionic liquid.

[0043] The specific capacitance measured by the electrode sheet in this example is 95F / g at a current density of 1A / g.

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Abstract

The invention discloses an asymmetric super capacitor with super long cycle stability. The asymmetric super capacitor is composed of a positive electrode sheet, a negative electrode sheet, a diaphragm arranged between the positive electrode sheet and the negative electrode sheet, and an electrolyte; the positive electrode sheet is a stainless steel mesh sheet, foamed nickel sheet or aluminum foil sheet which is coated with a mixture I of a reduced graphene oxide load carbon-clad metallic oxide composite material, a conductive agent and a binder; the negative electrode sheet is a stainless steel mesh sheet, foamed nickel sheet or aluminum foil sheet which is coated with a mixture II of a carbon material, a conductive agent and a binder; and the diaphragm is a porous fiber diaphragm; and the electrolyte is an ionic liquid. The invention also discloses a preparation method of the capacitor. With the method of the invention adopted, the super capacitor has the advantages of high charging and discharging speed, high power density, small internal resistance, cycle stability in an ionic liquid, and great realistic and strategic significance.

Description

technical field [0001] The invention relates to an asymmetric supercapacitor with ultra-long cycle stability and a preparation method thereof. Background technique [0002] As a new type of energy storage device, supercapacitor has the advantages of short charging time, high power density, long cycle life, wide temperature range, and good safety performance. In view of this, it has attracted much attention in the fields of consumer electronics, new energy power generation systems, distributed energy storage systems, intelligent distributed grid systems, and new energy vehicles. In addition, the excellent pulse charge and discharge performance and fast charge and discharge performance of supercapacitors make them play unique advantages in the field of special equipment and motion control. However, there is a certain gap between the energy density of supercapacitors and lithium-ion batteries and nickel-metal hydride batteries, which still needs to be further improved. In a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/22H01G11/32H01G11/46H01G11/26H01G11/62H01G11/84
CPCY02E60/13H01G11/22H01G11/26H01G11/32H01G11/46H01G11/62H01G11/84
Inventor 阎兴斌申保收郎俊伟张旭
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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