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Preparation method for asymmetric super capacitor with cobalt hydroxide and active carbon as anode and cathode respectively

A supercapacitor and cobalt hydroxide technology, which is applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, hybrid capacitor electrolytes, etc., can solve problems such as low energy density, achieve high activity, easy preparation process, and good combination and compatibility effects

Inactive Publication Date: 2017-02-22
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with renewable batteries, supercapacitors still have defects such as low energy density, so how to improve the energy density of supercapacitors has become the key to the development of supercapacitors

Method used

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  • Preparation method for asymmetric super capacitor with cobalt hydroxide and active carbon as anode and cathode respectively
  • Preparation method for asymmetric super capacitor with cobalt hydroxide and active carbon as anode and cathode respectively
  • Preparation method for asymmetric super capacitor with cobalt hydroxide and active carbon as anode and cathode respectively

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Use an area of ​​1cm 2 Carbon paper as the base, soak in acetone for 1 hour, then sonicate for 30 minutes; soak in hydrochloric acid for 1 hour, then sonicate for 30 minutes; soak in deionized water for 1 hour, then sonicate for 30 minutes. The treated carbon paper was dried in a constant temperature drying oven at 60 °C for 12 h. The carbon paper / cobalt hydroxide electrode was prepared by a three-electrode system potentiostatic deposition technique. In the electrochemical deposition, the concentration of cobalt nitrate was 1.2mol / L, the deposition potential was -0.9V, the temperature was 45°C, the deposition time was 200s, and the mass of the deposited active material was 1.94mg.

[0044] (2) Use an area of ​​1cm 2 Carbon paper as the base, soak in acetone for 1 hour, then sonicate for 30 minutes; soak in hydrochloric acid for 1 hour, then sonicate for 30 minutes; soak in deionized water for 1 hour, then sonicate for 30 minutes. The treated carbon paper was drie...

Embodiment 2

[0048] (1) Same as Embodiment 1 (1).

[0049] (2) is the same as embodiment 1 (2).

[0050] (3) is the same as embodiment 1 (3).

[0051] (4) Carry out the charge-discharge test of different current densities to above-mentioned asymmetric supercapacitor, obtain the relationship curve of energy density and power density ( Image 6 ). The maximum potential window of the capacitor is 1.5V. When the current density is 0.5A / g, the energy density and power density of the supercapacitor are 30.5Wh / kg and 375W / kg respectively; when the current density is 1A / g, the supercapacitor The energy density and power density are 27.2Wh / kg and 750W / kg respectively; when the current density is 2A / g, the energy density and power density of the supercapacitor are 23.6Wh / kg and 1500W / kg respectively; when the current density is 4A / g g, the energy density and power density of the supercapacitor are 19.3Wh / kg and 3000W / kg, respectively. It can be seen from the relationship between power density an...

Embodiment 3

[0053] (1) Same as Example 1 (1), the mass of the active substance deposited was 1.72mg.

[0054] (2) Same as the implementation example 1 (2), the quality of the active substance obtained is 4.26 mg.

[0055] (3) Prepare 50ml of 1mol / L KOH as the electrolyte, and assemble the electrode with an area of ​​1cm 2 asymmetric supercapacitors.

[0056] (4) The above-mentioned asymmetric supercapacitor is charged and discharged. The maximum potential window is 1.5V. When the current density is 1A / g, the specific capacitance and energy density of the supercapacitor are 66F / g and 20.6Wh / kg, respectively.

[0057] Under this mass ratio, the ratio of the electric quantity of the positive single electrode to the electric quantity of the negative single electrode is less than 1, and the specific capacitance and energy density are low.

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Abstract

The invention relates to an asymmetric super capacitor with cobalt hydroxide and active carbon as the anode and the cathode respectively and a preparation method thereof. The anode adopts a carbon material / cobalt hydroxide electrode, the cathode adopts a carbon material or a foamed nickel / active carbon electrode, the anode and the cathode are separated by a diaphragm such as a polypropylene sulfonic acid membrane, an electrolyte is an alkaline aqueous solution, and a single super capacitor or super capacitor set is assembled. The cobalt hydroxide of the anode provides a pseudocapacitor and the active carbon of the cathode provides an electrical double-layer capacitor, so that the specific capacitance is effectively improved, and the electric potential working window of the capacitor is widened, thereby improving the energy density of the super capacitor. The cobalt hydroxide material of the anode takes quasi-reversible oxidation reduction reaction, and the active carbon of the cathode performs static physical absorption, so that the asymmetric super capacitor is good in cyclic stability and has a long service life. The super capacitor set adopts a flexible package form, so that the mass energy density of a super capacitor overall device is greatly improved.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of chemical power sources, and in particular relates to an asymmetric supercapacitor in which cobalt hydroxide and activated carbon are positive and negative electrodes respectively and a preparation method thereof. [0003] Background technique: [0004] Compared with batteries, supercapacitors have the advantages of higher charge and discharge current density, higher power density, higher cycle stability, and environmental friendliness. They are efficient energy storage devices and have broad application prospects. The aqueous asymmetric supercapacitor has the advantages of low cost, easy assembly and operation, and has attracted extensive attention from researchers. However, compared with renewable batteries, supercapacitors still have defects such as low energy density, so how to improve the energy density of supercapacitors has become the key to the development of supercapacitors. People use hyd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/30H01G11/32H01G11/58H01G11/84H01G11/86
CPCY02E60/13H01G11/30H01G11/32H01G11/58H01G11/84H01G11/86
Inventor 郑伟涛李迁邓霆田宏伟张恒彬
Owner JILIN UNIV
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