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Water-based asymmetric super capacitor based on NiCo-LDH/rGO and rGO and preparation method thereof

A supercapacitor, asymmetric technology, used in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, hybrid capacitor electrolytes, etc., can solve problems such as capacitance attenuation, and achieve the effect of improving conductivity, increasing specific capacity, and high capacity

Inactive Publication Date: 2019-04-26
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the higher the current density, the capacitance of the material will decay

Method used

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  • Water-based asymmetric super capacitor based on NiCo-LDH/rGO and rGO and preparation method thereof
  • Water-based asymmetric super capacitor based on NiCo-LDH/rGO and rGO and preparation method thereof
  • Water-based asymmetric super capacitor based on NiCo-LDH/rGO and rGO and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] (1) Preparation and characterization of NiCo-LDH / rGO composite material: ultrasonically disperse 20 mg graphene oxide in 40 mL methanol solution, dissolve 0.5 mmol cobalt nitrate and 1.0 mmol nickel nitrate in the above solution, stir for 30 minutes, and dissolve The solution was transferred to a 100mL polytetrafluoroethylene reactor and reacted at 180°C for 12h. After the reaction, cool to room temperature, collect the product by centrifugation, and vacuum-dry at 60°C to obtain a NiCo-LDH / rGO composite material. Its structure is as figure 1 , 2 shown. in figure 1 is a high-magnification scanning electron microscope image, figure 2 It is a transmission electron microscope image, as shown in the figure, the sheet-like NiCo-LDH grows vertically on the graphene surface to form a layered structure.

[0061] (2) Preparation and characterization of rGO: Using graphene oxide and urea as raw materials and methanol as a solvent, 20 mg of graphene oxide was ultrasonically d...

Embodiment 2

[0068] (1) Preparation of NiCo-LDH / rGO composites:

[0069] Ultrasonic disperse 20 mg of graphene oxide in 40 mL of methanol solution, dissolve 1.0 mmol of cobalt nitrate and 0.5 mmol of nickel nitrate in the above solution, stir for 30 minutes, transfer the solution to a 100 mL polytetrafluoroethylene reactor, and heat at 180 ° C Reaction 12h. After the reaction, cool to room temperature, collect the product by centrifugation, and vacuum-dry at 60°C to obtain a NiCo-LDH / rGO composite material.

[0070] (2) Preparation of rGO:

[0071] Using graphene oxide and urea as raw materials and methanol as solvent, ultrasonically disperse 20mg of graphene oxide in 40mL of methanol solution, transfer the solution to a 100mL polytetrafluoroethylene reactor, and react at 180°C for 12h. After the reaction, the product was cooled to room temperature, centrifuged to collect the product, and dried under vacuum at 60°C to obtain rGO.

[0072] (3) Preparation and performance characterization...

Embodiment 3

[0081] (1) Preparation of NiCo-LDH / rGO composites:

[0082] Ultrasonic disperse 20mg of graphene oxide in 40mL of methanol solution, dissolve 0.75mmol of cobalt nitrate and nickel nitrate in the above solution, stir for 30 minutes, transfer the solution to a 100mL polytetrafluoroethylene reactor, and react at 180°C for 12h . After the reaction, cool to room temperature, collect the product by centrifugation, and vacuum-dry at 60°C to obtain a NiCo-LDH / rGO composite material.

[0083] (2) Preparation of rGO:

[0084] Using graphene oxide and urea as raw materials and methanol as solvent, ultrasonically disperse 20mg of graphene oxide in 40mL of methanol solution, transfer the solution to a 100mL polytetrafluoroethylene reactor, and react at 180°C for 12h. After the reaction, the product was cooled to room temperature, centrifuged to collect the product, and dried under vacuum at 60°C to obtain rGO.

[0085] (3) Preparation and performance characterization of NiCo-LDH / rGO com...

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Abstract

The invention relates to a water-based asymmetric super capacitor based on NiCo-LDH / rGO and rGO and a preparation method thereof. The method includes ultrasonically dispersed graphene oxide in a methanol solution, dissolving cobalt salt and nickel salt in a graphene oxide solution for hydrothermal reaction with the temperature of 120-180 DEG C and the reaction time of 12-16 h, conducting centrifugation after reaction to obtain a product A and conducting vacuum drying to obtain a NiCo-LDH / rGO composite material. The NiCo-LDH / rGO composite material is an anode material, and rGO is a cathode material. The water-based asymmetric super capacitor is then obtained. The NiCo-LDH / rGO composite material has the capacitance of 2130 F / g at the current density of 2 A / g. The working voltage of the capacitor can reach 1.6V, the specific capacitance can reach 100F / g, the energy density can reach 35.5 Wh / kg, and the capacity fades by 24.5% after 2000 cycles.

Description

technical field [0001] The invention belongs to the technical field of capacitor preparation, and in particular relates to an aqueous asymmetric supercapacitor based on NiCo-LDH / rGO and rGO and a preparation method thereof. Background technique [0002] Supercapacitors are a power source between traditional capacitors and batteries, and have the advantages of high power density, short discharge time, long cycle life, and wide operating temperature range. Therefore, it can be widely used in different application scenarios such as auxiliary peak power, backup power supply, stored regenerative energy, and alternative power supply. Many fields have huge application value and market potential. [0003] Aqueous supercapacitors have the advantages of environmental friendliness, non-combustibility, and high safety, and are currently the main direction of supercapacitor research. However, since the water decomposition potential window is 1.23V, the working voltage of aqueous superc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/26H01G11/32H01G11/46H01G11/54H01G11/84H01G11/86
CPCH01G11/26H01G11/32H01G11/46H01G11/54H01G11/84H01G11/86Y02E60/13
Inventor 刘久荣刘伟乐凯汪宙吴莉莉王凤龙
Owner SHANDONG UNIV
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