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Preparation method of supercapacitor with good cycling stability

A supercapacitor, cycle stability technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of decreased energy storage performance, less than ideal cycle stability, low specific capacitance and experimental value, etc. Improve fast electron transfer rate, improve electron receiving efficiency, excellent effect of electrochemical energy storage

Active Publication Date: 2021-09-21
CHONGQING UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Transition metal oxides as supercapacitor electrode materials have high theoretical specific capacitance, rich earth resources, low cost and no environmental pollution, etc., which have attracted widespread attention. However, the specific capacitance and experimental values ​​obtained by transition metal oxides are far lower than Theoretical value, on the other hand, during the charging and discharging process of the transition metal oxide electrode, due to the change of the electrode volume, it will destroy its own structure, which will eventually lead to the decline of the energy storage performance of the supercapacitor after multiple charging and discharging, and the cycle stability is not ideal. In addition, due to the electrode Being in the electrolyte for a long time, the electrolyte is corrosive to a certain extent, which will also lead to the destruction of the electrode structure, which will eventually lead to a decrease in charge and discharge performance and a shortened service life

Method used

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  • Preparation method of supercapacitor with good cycling stability
  • Preparation method of supercapacitor with good cycling stability
  • Preparation method of supercapacitor with good cycling stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A supercapacitor with good cycle stability is prepared as follows:

[0030] 1. NiO@CoMoO 4 Preparation of / NF electrode:

[0031] (1) Soak 1.5cm*3.5cm NF (nickel foam) in 2.8mol / L hydrochloric acid solution for 8 minutes, take it out, wash it with deionized water to remove surface impurities, and then dry it in an environment with a temperature of 60°C for 15 hours , take it out, then immerse the treated NF in deionized water and transfer it to a stainless steel autoclave, the mass ratio of NF (foam nickel) to deionized water is 1:,800, and then keep the temperature at 140°C for 26 hours , naturally cool to room temperature, take it out, wash it with deionized water for 5 times, then place it in a vacuum drying oven, set the vacuum degree to -0.08MPa, and dry it at 55°C for 22 hours. After drying, place it in a quartz tube furnace. Raise the temperature to 420°C at a heating rate of 0.6°C / min for 2.5 hours to obtain NiO flakes / NF.

[0032] (2) Another 65.1mg of C O ...

Embodiment 2

[0084] A supercapacitor with good cycle stability is prepared as follows:

[0085] 1. NiO@CoMoO 4 Preparation of / NF electrode:

[0086] (1) Immerse 1.5cm*3.5cm NF (nickel foam) in 2.5mol / L hydrochloric acid solution for 5 minutes, take it out, wash it with deionized water to remove surface impurities, and then dry it in an environment with a temperature of 55°C for 16 hours , take it out, and then immerse the treated NF in deionized water and transfer it to a stainless steel autoclave. The mass ratio of NF (foam nickel) to deionized water is 1:700, and then keep the temperature at 140°C for 28 hours. Naturally cool to room temperature, take it out, wash it with deionized water for 3 times, and then place it in a vacuum drying oven, set the vacuum degree to -0.05MPa, and dry at 65°C for 20 hours. After drying, place it in a quartz tube furnace. The heating rate is 0.5°C / min and the temperature is raised to 400°C for 3 hours to obtain NiO flakes / NF.

[0087] (2) Another 65.1...

Embodiment 3

[0093] A supercapacitor with good cycle stability is prepared as follows:

[0094] 1. NiO@CoMoO 4 Preparation of / NF electrode:

[0095] (1) Soak 1.5cm*3.5cm NF (nickel foam) in 3.0mol / L hydrochloric acid solution for 10 minutes, take it out, wash it with deionized water to remove surface impurities, and then dry it for 12 hours at 60°C , take it out, and then immerse the treated NF in deionized water and transfer it to a stainless steel autoclave. The mass ratio of NF (foam nickel) to deionized water is 1:900, and then keep the temperature at 150°C for 24 hours. Naturally cool to room temperature, take it out, wash it with deionized water for 5 times, and then place it in a vacuum drying oven, set the vacuum degree to -0.08MPa, and dry at 55°C for 20 hours. After drying, place it in a quartz tube furnace to The heating rate is 0.5°C / min and the temperature is raised to 450°C for 3 hours to obtain NiO flakes / NF.

[0096] (2) Another 65.1mg of C O Cl 2 .6H 2 O and 50.8 mg...

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Abstract

The invention relates to a preparation method of a supercapacitor with good cycling stability, which is realized by taking NiO@CoMoO4 / NF, an active carbon plate, a 6mol / L KOH solution and polypropylene as raw materials through preparation of a NiO@CoMoO4 / NF electrode and assembly of the supercapacitor. The NiO@CoMoO4 / NF is an anode of the super capacitor, the activated carbon plate is a cathode of the super capacitor, the KOH solution is an electrolyte, and the polypropylene is an isolation plate. The NiO@CoMoO4 / NF electrode in the supercapacitor electrode is treated by a tough material, so that the NiO@CoMoO4 / NF electrode is more suitable for the volume change in the charging and discharging process, meanwhile, the corrosion effect of an electrolyte can be prevented, the cycling stability of a product is good, after 10000 times of charging and discharging cycles, the capacity of the supercapacitor electrode is not attenuated, 100% of the maximum capacity is still kept, the specific capacitance is as high as 79.4 F / g, the energy density is 35.7 Wh / kg, and the functional density is 899.5 W / kg.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and in particular relates to a method for preparing a supercapacitor with good cycle stability. Background technique [0002] As the basis for human survival and development, materials are an indispensable part of people's lives. Since ancient times, human beings have been continuously researching and exploring the substances in nature. On the basis of the application of traditional materials, they understand the laws of material performance changes, and constantly explore new materials and related technologies suitable for the development of the times, so that they can benefit society. [0003] Supercapacitors, also known as electrochemical capacitors, electric double layer capacitors, gold capacitors, and farad capacitors, are electrochemical components developed in the 1970s and 1980s to store energy through polarized electrolytes. It is different from traditional chemical power source...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/84H01G11/24H01G11/30H01G11/46
CPCH01G11/84H01G11/24H01G11/30H01G11/46Y02E60/13H01G11/34H01G11/86
Inventor 田亮亮张晓宇杨文耀李雪曾冲
Owner CHONGQING UNIV OF ARTS & SCI
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