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Graphene composite electrode and preparation method and application

A graphene composite and graphene technology, which is applied to battery electrodes, circuits, capacitors, etc., can solve the problems of narrow working potential window, difficult industrial use, and high price, so as to save the coating process, shorten the time, and improve the Effects of Stability and Conductivity

Active Publication Date: 2013-04-10
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, ruthenium oxide is an ideal supercapacitor material among transition metal oxides, but it is expensive and difficult to be used industrially; nickel oxide and cobalt oxide have the disadvantage of narrow working potential window; and manganese oxide is rich in resources, low in price, and has The dual characteristics of electric double layer capacitance and pseudocapacitance, and the manganese oxide material is non-polluting and can be used in large-scale production. It is considered to be a very potential electrode material for supercapacitors, which has attracted widespread attention.
However, the traditionally prepared manganese oxide electrode material has the problem of high resistance, which limits its further application.

Method used

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  • Graphene composite electrode and preparation method and application

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preparation example Construction

[0026] Such as figure 1 As shown, the preparation method of the graphene composite electrode of the present embodiment comprises the following steps:

[0027] Step S1: ultrasonically disperse graphite oxide in a solvent to prepare a graphene oxide solution, and then deposit graphene oxide on the surface of the current collector by electrodeposition to obtain a graphene oxide / current collector electrode.

[0028] Preferably, the graphite oxide in this step is prepared according to the following steps: add graphite powder to concentrated sulfuric acid at 0°C, then add potassium permanganate, keep the temperature of the system below 10°C, stir for 2 hours, and then cool it at room temperature Stir in a water bath for 24 hours, then slowly add deionized water to the reaction system under ice bath conditions, and then add deionized water containing hydrogen peroxide after 15 minutes until the color of the solution turns bright yellow, suction filter while it is hot, and then use W...

Embodiment 1

[0037] The process flow is as follows:

[0038] Natural flake graphite→graphite oxide→graphene oxide / nickel electrode→manganese dioxide / graphene oxide / nickel electrode→manganese dioxide / graphene / nickel electrode

[0039] (1) Natural flake graphite: 100 mesh.

[0040] (2) Graphite oxide: Add 0.5g of 100 mesh natural flake graphite powder to 0°C, 11.5mL of concentrated sulfuric acid, then add 1.5g of potassium permanganate, keep the temperature of the mixture below 10°C, stir for 2 hours, Then, after stirring in a water bath at room temperature for 24 hours, 46 mL of deionized water was slowly added in an ice bath. After 15 minutes, add 140mL of deionized water (which contains 2.5mL of 30% hydrogen peroxide), after which the color of the mixture turns bright yellow. Suction filtration, then 250mL of 10% hydrochloric acid is used for washing, suction filtration, 60 ℃ vacuum drying for 48 hours to obtain graphite oxide.

[0041] (3) Graphene oxide / nickel electrode: Add the grap...

Embodiment 2

[0046] The process flow is as follows:

[0047] Natural flake graphite→graphite oxide→graphene oxide / aluminum electrode→manganese dioxide / graphene oxide / aluminum electrode→manganese dioxide / graphene / aluminum electrode

[0048] (1) Natural flake graphite: 500 mesh.

[0049] (2) Graphite oxide: Add 0.5g of 500 mesh natural flake graphite powder into 0°C, 11.5mL of concentrated sulfuric acid, then add 1.5g of potassium permanganate, keep the temperature of the mixture below 10°C, stir for 2 hours, then After stirring in a water bath at room temperature for 24 hours, 46 mL of deionized water was slowly added in an ice bath. After 15 minutes, add 140mL of deionized water (which contains 2.5mL of 30% hydrogen peroxide), after which the color of the mixture turns bright yellow. Suction filtration, then 250mL of 10% hydrochloric acid is used for washing, suction filtration, 60 ℃ vacuum drying for 48 hours to obtain graphite oxide.

[0050] (3) Graphene oxide / aluminum electrode: Gra...

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Abstract

The invention provides a graphene composite electrode which comprises a current collector and electrode active materials arranged on the surface of the current collector, wherein the electrode active materials comprise graphene and manganese dioxide. The graphene is in a stratified structure and is arranged on the surface of the current collector, and the manganese dioxide is arranged on the surface of the graphene in the stratified structure. Mass percentage content of the graphene in the electrode active materials is 80%-90%. In addition, the invention further relates to a preparation method and an application of the graphene composite electrode. Oxidized graphene and the manganese dioxide are deposited on the current collector step by step, adhesion agents are not needed, and therefore equivalent series resistance of the whole electrode is reduced effectively, capacity and pseudocapacitance of an electric double-layer of the graphene and the manganese dioxide are developed simultaneously, and stability and conductivity of the electrode are well improved by addition of the graphene. In addition, through the method of electro-deposition, the electrode materials are directly deposited on an electrode plate, a complex coating process is saved, the process is simple, and time is short.

Description

【Technical field】 [0001] The invention relates to the field of electrode materials for batteries or capacitors, in particular to a graphene composite electrode and its preparation method and application. 【Background technique】 [0002] Supercapacitors have attracted much attention due to their high energy density, high power density, long life, and environmental friendliness. It has extremely important and broad application prospects in aerospace and national defense technology such as solar chargers, alarm devices, household appliances, computer backup power supplies, and aircraft ignition devices, and has become a research hotspot all over the world. [0003] In the research and development of supercapacitors, carbon materials with high specific surface area are ideal electrode materials for supercapacitors, such as activated carbon, carbon aerogel, carbon nanotubes and carbon fibers. Although carbon supercapacitors have been initially commercialized, their application is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042H01G9/145H01M4/134H01M4/1395
CPCY02E60/10Y02E60/13
Inventor 周明杰吴凤王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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