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Enhanced super capacitor and preparation method thereof

A supercapacitor and electrode technology, which is applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, hybrid capacitor electrolytes, etc., can solve the problems of not providing capacitor cycle performance test data, poor cycle performance of dihydric phenol, etc., and achieve excellent Cycle charge and discharge stability, improve cycle stability, and improve the effect of capacitor performance

Active Publication Date: 2018-04-17
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Invention patent (a method of making nitrogen-doped graphene supercapacitor based on redox active electrolyte, CN 105632783 A) using dihydric phenolic compounds as the pseudocapacitive active components in the electrolyte, which can increase the electrode specific capacitance of the supercapacitor to 480F / g, which is 3 times the specific capacitance of the electrode of the supercapacitor without adding active ingredients, but the device does not provide the test data of the capacitor cycle performance. According to relevant literature reports, the cycle performance of adding dihydric phenol is poor, and only 65% of initial capacitance

Method used

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  • Enhanced super capacitor and preparation method thereof
  • Enhanced super capacitor and preparation method thereof
  • Enhanced super capacitor and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0054] Take the specific surface area as 2000m 2 g -1 Activated carbon powder is made of carbon-based material, conductive agent (conductive carbon black), binder (water dispersion of sodium carboxymethyl cellulose and styrene-butadiene rubber) according to the solid mass ratio (85:10:2.5:2.5) mixed ball milling The electrode slurry was obtained, which was evenly coated on the graphite sheet by a coating machine, and dried at 120°C for 10 hours to make the electrode active material with a loading capacity of 3mgcm -2 The activated carbon electrode was cut into discs with a diameter of 16 mm for later use.

[0055] Dissolve yellow sodium anthraquinone-2-sulfonate powder in 1mol L at 80°C -1 Sulfuric acid to make redox electrolyte.

[0056] The above-mentioned activated carbon electrode was immersed in the above-mentioned redox electrolyte for 24 hours.

[0057] Separate the impregnated activated carbon electrodes with a filter paper diaphragm, and use 0.012mol L -1 1mol L ...

Embodiment 2

[0062] The active carbon electrode that embodiment 1 is made and contains 0.006mol L -1 1mol L of sodium anthraquinone-2-sulfonate -1 The sulfuric acid electrolyte was assembled into a symmetrical supercapacitor SC-3 according to the method of assembling SC-2, and the constant current charge and discharge test with different current densities was carried out. The experimental results found that at 1A g -1 The mass specific capacitance of supercapacitor SC-3 is smaller than that of SC-2 at current density, which is 78F g -1 . The possible reason is that the concentration of the electroactive substance sodium anthraquinone-2-sulfonate in the electrolyte is not high enough. The Faraday quasi-capacitance improved by sodium is limited, resulting in insufficient mass specific capacitance of the final supercapacitor.

Embodiment 3

[0064] The active carbon electrode that embodiment 1 is made and contains 0.024mol L -1 1mol L of sodium anthraquinone-2-sulfonate -1 The sulfuric acid electrolyte was assembled into a symmetrical supercapacitor SC-4 according to the method of assembling SC-2, and the constant current charge and discharge test with different current densities was carried out. The experimental results found that at 1A g -1 The mass specific capacitance of supercapacitor SC-4 is similar to that of SC-2 at the current density, which is 106Fg -1 . The possible reason is that the activated carbon electrode has a limited amount of adsorption of the electroactive substance anthraquinone-2-sodium sulfonate in the electrolyte, and because the Faraday quasi-capacitance part of the supercapacitor is mainly composed of the electroactive substance anthraquinone-2-sodium sulfonate adsorbed on the electrode. Therefore, when the concentration of sodium anthraquinone-2-sulfonate in the electrolyte exceeds t...

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Abstract

The invention discloses an enhanced super capacitor and a preparation method thereof, especially an electrolyte, a super capacitor based on the electrolyte and including an anthraquinone redox activesubstance, and a preparation method of the super capacitor. The electrolyte comprises a support electrolyte, the anthraquinone redox active substance and a solvent. The novel super capacitor has a higher specific capacitance compared with that of common carbon-based super capacitors, and obvious advantages in the capacitive performance compared with a super capacitor made of the same electrode material but does not include the anthraquinone redox active substance. A simple method is used, the circulation stability of the carbon-based super capacitor is improved, the capacitive performance of the carbon-based super capacitor is improved effectively, and the prepared super capacitor is characterized by high specific capacity, high energy density and high power density, and has huge application potentials.

Description

technical field [0001] The invention belongs to the technical field of electric storage devices, and in particular relates to an enhanced supercapacitor and a preparation method thereof. Background technique [0002] Supercapacitor is a new type of electrochemical energy storage device, which has the advantages of fast charge and discharge rate, high power density, long cycle life, safety and environmental protection, etc. It is used as a reliable and efficient energy storage device in power facilities with high density requirements. However, compared with other secondary batteries, the energy density of supercapacitors is low, and improving the specific capacitance of supercapacitors is one of the main ways to solve their energy density, and preparing electrode materials of different types, shapes and surface properties is a The main method to increase the specific capacity of supercapacitors. At the same time, the redox electrolyte system with pseudocapacitive activity c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/62H01G11/32H01G11/84
Inventor 张易宁方建辉王维陈素晶刘永川苗小飞陈远强张祥昕程健林嵩岳冯文豆林长新李达禄李歆薛熙来
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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