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

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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 a

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
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Example Embodiment

[0026] Example 1

[0027] The reactants were mixed according to the ratio of 12ml of concentrated sulfuric acid, 5g of potassium persulfate and 5g of phosphorus pentoxide per 10g of flake graphite, reacted at 80°C for 4.5 hours and then cooled to room temperature naturally, then diluted with distilled water, filtered, and washed until Neutral, naturally dried to obtain pre-oxidized graphite; according to the ratio of 72 ml of concentrated sulfuric acid and 30 g of potassium permanganate per 10 grams of pre-oxidized graphite, slowly add pre-oxidized graphite to the concentrated sulfuric acid of the ice-water bath, and then slowly add potassium permanganate, Stir the reaction for 10 to 20 minutes under the condition that the temperature does not exceed 20 °C, then heat up to 35 °C and continue to stir and react for 2 hours, then slowly add deionized water, heat up to 95 °C, and continue stirring for 30 minutes. After the reaction, add an appropriate amount of hydrogen peroxide to...

Example Embodiment

[0033] Example 2

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

[0035] Take 100mg of graphite oxide and dissolve it in 100ml of distilled water, ultrasonically make it completely dissolved form graphene oxide solution, add 2.5mg 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 The nano-manganese dioxide particles are ultrasonically formed into a uniformly dispersed graphene oxide / manganese dioxide solution.

[0036] To the mixed solution of graphene oxide and manganese dioxide, add 1.2 ml of 80% hydrazine hydrate solution, heat and stir to reflux until complete reaction, solid-liquid separation, washing and drying to obtain graphene-coated manganese oxide composite electrode material.

[0037] The implementation steps of the electrochemical performance test are the same as those in Example 1. The results show that it has a sp...

Example Embodiment

[0038] Example 3

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

[0040] Get 100mg of graphite oxide and dissolve it in 100ml of distilled water, ultrasonically make it completely dissolved form graphene oxide solution, add 2.5mg 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 The nano-manganese dioxide particles are ultrasonically formed into a uniformly dispersed graphene oxide / manganese dioxide solution.

[0041] To the mixed solution of graphene oxide and manganese dioxide, add 1.2 ml of 80% hydrazine hydrate solution, heat and stir to reflux until complete reaction, solid-liquid separation, washing and drying to obtain graphene-coated manganese oxide composite electrode material.

[0042] The implementation steps of the electrochemical performance test are the same as those in Example 1. The results show that it has a speci...

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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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