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Graphene-cladding manganese dioxide combination electrode material and method for producing same

A technology of graphene coating and manganese dioxide, which is applied in hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, circuits, etc., can solve problems such as unsatisfactory cycle performance, easy agglomeration, and affecting performance, so as to increase cycle Stability, prevent agglomeration, increase the effect of specific capacity

Inactive Publication Date: 2012-10-03
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene materials are prone to agglomeration during the preparation process, which seriously affects its own performance.
Among Faraday capacitor electrode materials, manganese oxide has attracted a lot of attention due to its low cost and environmental friendliness. However, when manganese oxide is used as a supercapacitor electrode material, it has fatal defects: poor conductivity and unsatisfactory cycle performance.

Method used

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  • Graphene-cladding manganese dioxide combination electrode material and method for producing same
  • Graphene-cladding manganese dioxide combination electrode material and method for producing same
  • Graphene-cladding manganese dioxide combination electrode material and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] According to the ratio of applying 12ml concentrated sulfuric acid, 5g potassium persulfate and 5g phosphorus pentoxide for every 10 grams of graphite flakes, the reactants were mixed, reacted at 80°C for 4.5 hours, cooled naturally to room temperature, then diluted with distilled water, filtered, and washed until Neutral, natural drying to obtain pre-oxidized graphite; according to the ratio of applying 72ml of concentrated sulfuric acid and 30g of potassium permanganate per 10 grams of pre-oxidized graphite, slowly add pre-oxidized graphite to the concentrated sulfuric acid in an ice-water bath, and then slowly add potassium permanganate, Stir and react for 10 to 20 minutes at a temperature not exceeding 20°C, then raise the temperature to 35°C and continue stirring for 2 hours, then slowly add deionized water, raise the temperature to 95°C, continue stirring for 30 minutes, then add an appropriate amount of hydrogen peroxide to reduce the residual Oxidant, the solutio...

Embodiment 2

[0034] The preparation steps of graphite oxide and α-type manganese dioxide are the same as in Example 1.

[0035] Take 100mg of graphite oxide and dissolve it in 100ml of distilled water, ultrasonically dissolve it completely to form a graphene oxide solution, add 2.5mg of LD dispersant, according to the ratio of the mass of graphene oxide to the mass of manganese oxide is 1:1.3, add 130mg just prepared Nano manganese dioxide particles, ultrasonically form a uniformly dispersed graphene oxide / manganese dioxide solution.

[0036] Add 1.2ml of 80% hydrazine hydrate solution to the mixed solution of graphene oxide and manganese dioxide, heat, stir and reflux until complete reaction, separate solid from liquid, wash and dry to obtain graphene-coated manganese oxide composite electrode material.

[0037] The implementation steps of the electrochemical performance test are the same as in Example 1. The results show that the specific capacity is 167 F / g at a scanning speed of 10 mV / ...

Embodiment 3

[0039] The preparation steps of graphite oxide and α-type manganese dioxide are the same as in Example 1.

[0040] Dissolve 100mg of graphite oxide in 100ml of distilled water, ultrasonically dissolve it completely to form a graphene oxide solution, add 2.5mg of LD dispersant, according to the ratio of the mass of graphene oxide to the mass of manganese oxide is 1:9, add 900mg just prepared Nano manganese dioxide particles, ultrasonically form a uniformly dispersed graphene oxide / manganese dioxide solution.

[0041] Add 1.2ml of 80% hydrazine hydrate solution to the mixed solution of graphene oxide and manganese dioxide, heat, stir and reflux until complete reaction, separate solid from liquid, wash and dry to obtain graphene-coated manganese oxide composite electrode material.

[0042] The implementation steps of the electrochemical performance test are the same as in Example 1. The results show that it has a specific capacity of 187 F / g at a scanning speed of 10 mV / s, and af...

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Abstract

A graphene-cladding manganese dioxide combination electrode material and a method for producing the same, belonging to the technical field of electronic functional materials, the graphene-cladding manganese dioxide combination electrode material comprises nano manganese dioxide particles and graphene cladded with manganese dioxide particles, wherein the mass ratio of graphene and the nano manganese dioxide particles is 1:(1.25-10). The method comprises the following steps: preparing the nano manganese dioxide particles and graphite oxide respectively, and mixing and ultrasonically dispersing to obtain the graphene-cladding manganese dioxide dispersing agent, finally, reducing the graphite oxide to obtain the graphene-cladding manganese dioxide combination electrode material. The graphene is used to clad the manganese dioxide, so the electrical conductivity and cycling stability of the electrode material parts can be improved; and meanwhile, the existence of the manganese dioxide particles also effectively prevents the graphene from reunion, so the specific capacity of the electrode material of a supercapacitor is obviously increased. The method has a simple technology, reaction products are easy to control, the purity is high, and the produced combination electrode material is suitable for producing an electrode plate of the supercapacitor.

Description

technical field [0001] The invention belongs to the technical field of electronic functional materials, and relates to a composite electrode material in a supercapacitor and a preparation method thereof. technical background [0002] Supercapacitor is a new energy storage element that can complete charging and discharging in a few seconds, and has the characteristics of large specific capacity, high power density, long cycle life and environmental friendliness (ACS Nano 2010;4(3): 1587–1595), it has a wide range of applications in electric vehicles, communications, military, aerospace and other fields. According to different energy storage mechanisms, supercapacitors can be divided into two types (Phys.Rev.Lett.2008; 101(096802):1-4.), namely electric double layer capacitors based on surface electrostatic adsorption and reversible redox based Response of a Faraday quasicapacitor. The electrode materials of electric double layer capacitors usually use activated carbon mater...

Claims

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Application Information

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IPC IPC(8): H01G9/058H01G11/30H01G11/86
CPCY02E60/13
Inventor 薛卫东蒋奉君
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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