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Preparation method of asymmetric supercapacitor of water system

A supercapacitor, asymmetric technology, applied in the direction of hybrid/electric double layer capacitor manufacturing, hybrid capacitor electrodes, etc., can solve the problem of low energy density, achieve high energy density, avoid dead volume, and increase the effect of active specific surface area

Inactive Publication Date: 2014-05-28
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for preparing an aqueous asymmetric supercapacitor. The present invention increases the voltage window, further improves the energy density, and overcomes the defects of low energy density of traditional capacitors.

Method used

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  • Preparation method of asymmetric supercapacitor of water system
  • Preparation method of asymmetric supercapacitor of water system
  • Preparation method of asymmetric supercapacitor of water system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A kind of NiCo 2 o 4 co x Ni 1-x (OH) 2 / / The preparation of CMK-3 water-based asymmetric supercapacitor, the characteristic steps are: 1) NiCo 2 o 4 co x Ni 1-x (OH) 2 Preparation of:

[0034] A Put the foam nickel of appropriate size into a solution containing 1M hydrochloric acid for ultrasonic cleaning, the purpose is to remove the nickel oxide on the surface of the foam nickel.

[0035] B takes by weighing raw material nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 O) 0.29g, cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) 0.58g and ammonium nitrate (NH 4 NO 3 ) was dissolved in water and stirred to obtain a mixed solution in which Ni(NO 3 ) 2 ·6H 2 O and Co(NO 3 ) 2 ·6H 2 O molar ratio is 1:2, ammonium nitrate is 0.08g.

[0036] C. Place the above-mentioned cleaned foamed nickel in the mixed solution of step B, heat to 70° C., and then use the electrochemical deposition method to deposit under the condition of -1V constant voltage for 5 minut...

Embodiment 2

[0044] A kind of NiCo 2 o 4 co x Ni 1-x (OH) 2 / / The preparation of CMK-3 water-based asymmetric supercapacitor, the characteristic steps are: 3) NiCo 2 o 4 co x Ni 1-x (OH) 2 Preparation of:

[0045] A Put the foam nickel of appropriate size into a solution containing 1M hydrochloric acid for ultrasonic cleaning, the purpose is to remove the nickel oxide on the surface of the foam nickel.

[0046] B takes by weighing raw material nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 O) 0.29g, cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) 0.58g and ammonium nitrate (NH 4 NO 3 ) was dissolved in water and stirred to obtain a mixed solution in which Ni(NO 3 ) 2 ·6H 2 O and Co(NO 3 ) 2 ·6H 2 O molar ratio is 1:2, ammonium nitrate is 0.08g.

[0047] C. Put the above-mentioned cleaned foamed nickel into the mixed solution of step B, heat to 70° C., and then use the electrochemical deposition method to deposit under the condition of -1V constant voltage for 8 minut...

Embodiment 3

[0055] A kind of NiCo 2 o 4 co x Ni 1-x (OH) 2 / / The preparation of CMK-3 water-based asymmetric supercapacitor, the characteristic steps are: 1) NiCo 2 o 4 co x Ni 1-x (OH) 2 Preparation of:

[0056] A Put the foam nickel of appropriate size into a solution containing 1M hydrochloric acid for ultrasonic cleaning, the purpose is to remove the nickel oxide on the surface of the foam nickel.

[0057] B takes by weighing raw material nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 O) 0.29g, cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O) 0.58g and ammonium nitrate (NH 4 NO 3 ) was dissolved in water and stirred to obtain a mixed solution in which Ni(NO 3 ) 2 ·6H 2 O and Co(NO 3 ) 2 ·6H 2 O molar ratio is 1:2, ammonium nitrate is 0.08g.

[0058] C. Place the cleaned nickel foam in the mixed solution of step B, heat to 70° C., and then use the electrochemical deposition method to deposit under the condition of -1V constant voltage for 10 minutes.

[0059] D T...

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Abstract

The invention relates to a preparation method of an asymmetric supercapacitor of a water system. The preparation method comprises the steps of (1) growing a NiCo2O4@CoxNi(1-x)(OH)2 core-shell nanosheet array on foamed nickel as a cathode material of a supercapacitor; (2) coating the foamed nickel with activated carbon CMK-3 as an anode material; (3) with a potassium hydroxide solution as an electrolyte solution, assembling the NiCo2O4@CoxNi(1-x)(OH)2 cathode material and the CMK-3 anode material to form the asymmetric supercapacitor. The NiCo2O4@CoxNi(1-x)(OH)2 electrode material prepared by the method has relatively high area specific capacitance up to 5.71F / cm<2>, and the obtained NiCo2O4@CoxNi(1-x)(OH)2 / / CMK-3 asymmetric supercapacitor of the water system has the voltage window of 1.6V and is high in energy density, good in stability and simple in preparation process.

Description

technical field [0001] The invention belongs to NiCo 2 o 4 The field of supercapacitors, in particular to a method for preparing an aqueous asymmetric supercapacitor. Background technique [0002] Supercapacitors have great application prospects in portable electronic devices, hybrid electric vehicles, and a large number of micro-devices, due to their high power density, long cycle life, safety, and environmental friendliness. NiCo 2 o 4 Electrode materials are currently receiving extensive attention from researchers, mainly because NiCo 2 o 4 Has a ratio of NiO and Co 3 o 4 Higher conductivity and electrochemical reactivity. Therefore it is possible to use NiCo 2 o 4 The electrode material is used as a skeleton to grow other materials, which can improve the conductivity of the electrode material, and NiCo 2 o 4 The synergistic effect of matrix composites can improve the electrochemical performance of composite electrode materials. Recently, related reports have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/24
CPCY02E60/13
Inventor 胡俊青徐开兵黄小娟安磊李文尧
Owner DONGHUA UNIV
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