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Preparation method of manganese dioxide-based composite material applied to supercapacitor and electrochemical performance testing method of same

A manganese dioxide-based, supercapacitor technology, applied in the field of material chemistry, can solve the problems of short cycle life and low power density of energy storage equipment, and achieve the effect of good energy storage characteristics and high cycle life.

Active Publication Date: 2020-12-18
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art, provide a method for preparing a manganese dioxide-based composite material applied to a supercapacitor and a method for testing its electrochemical performance, and solve the problem of short cycle life and low power consumption of current energy storage equipment. Issues such as low density

Method used

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  • Preparation method of manganese dioxide-based composite material applied to supercapacitor and electrochemical performance testing method of same
  • Preparation method of manganese dioxide-based composite material applied to supercapacitor and electrochemical performance testing method of same
  • Preparation method of manganese dioxide-based composite material applied to supercapacitor and electrochemical performance testing method of same

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Effect test

Embodiment 1

[0026] A kind of synthetic steps of manganese dioxide-based composite material applied to supercapacitor is as follows:

[0027] Weigh 50 mg of titanium carbide MXene, mix it with 50 ml of distilled water in a beaker, and place the beaker in an ultrasonic cleaner for ultrasonic vibration for 60 minutes to prepare a titanium carbide MXene suspension. Then weigh 200 mg of potassium permanganate powder, add 250 ml of distilled water, and stir to make potassium permanganate solution. Finally, the two are mixed in a sealed beaker, and placed on a magnetic stirrer for 36 hours at room temperature to obtain a black manganese dioxide-based composite material MnO 2 / Ti 3 C 2 . The obtained samples were collected through repeated washing with three times of distilled water and drying in a constant temperature oven at 50°C.

Embodiment 2

[0029] A kind of electrochemical performance test procedure of manganese dioxide-based composite material applied to supercapacitor is as follows:

[0030] The first step is to prepare before the experiment. Mix and grind the prepared manganese dioxide-based composite material, acetylene black, and polytetrafluoroethylene emulsion at a mass ratio of 16:3:1, and add absolute ethanol as a dispersant during the grinding process. Subsequently, the ground mixture is coated with two sheets of nickel foam of the same specification (the specification is 2 cm * 1 cm * 0.1 cm), and it is placed in a tablet press with a pressure of 5 MPa and squeezed for 1 minute. , made of electrode sheet.

[0031] The second step is electrochemical testing. The electrode sheet was used as the working electrode, the saturated calomel electrode was used as the reference electrode, and the platinum sheet electrode was used as the counter electrode, 1mol / L Na 2 SO 4 The solution was used as an electrol...

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Abstract

The invention discloses a preparation method of a manganese dioxide-based composite material applied to a supercapacitor. The preparation method comprises the following steps: mixing and stirring flaky titanium carbide MXene and distilled water in a beaker to form a turbid liquid, adding a potassium permanganate solution, and carrying out sealing and stirring to obtain the manganese dioxide-basedcomposite material MnO2 / Ti3C2. The prepared manganese dioxide-based composite material is subjected to an electrochemical performance test to obtain a high specific capacitance of 317.6 F / g at a scanning rate of 5 mV / s and a high specific capacitance of 332 F / g at a current density of 2 A / g, and a sound energy storage characteristic is realized. And under the condition of 5000 times of charging and discharging, the efficiency of the capacitor is maintained at 75% or above, which indicates that the capacitor has a relatively long cycle service life.

Description

technical field [0001] The invention relates to a preparation method of a manganese dioxide-based composite material applied to a supercapacitor and a method for testing its electrochemical performance, belonging to the technical field of material chemistry. Background technique [0002] In recent years, due to the energy crisis and environmental pollution, people urgently need to seek clean energy (such as solar energy, wind energy, etc.) to replace traditional fossil fuels. The key to solving this problem lies in excellent energy conversion and storage systems. Among many energy conversion and storage systems, supercapacitors have attracted more and more attention because of their high capacity, long life and environmental protection. However, the choice of electrode materials has a great influence on the performance constraints of supercapacitors. It is currently a challenge to improve the performance of supercapacitors by developing new electrode materials while improvi...

Claims

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Application Information

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IPC IPC(8): H01G11/86H01G11/46H01G11/32H01G11/24G01N27/30G01N27/48
CPCH01G11/86H01G11/46H01G11/32H01G11/24G01N27/30G01N27/48Y02E60/13
Inventor 何海燕王国军黄华杰杨翠珍陈语娴
Owner HOHAI UNIV
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