Preparation method of cobaltosic oxide/graphene three-dimensional mixed structure flexible electrode

A three-dimensional mixing technology of cobalt tetroxide, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve problems such as poor cycle stability of cobalt tetroxide, inability to develop specific surface area, and easy stacking of graphene, so as to avoid cycle stability Poor, improve cycle stability, improve conductivity

Active Publication Date: 2015-11-18
HARBIN INST OF TECH
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  • Abstract
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Problems solved by technology

[0005] The present invention aims to solve the problem of easy stacking of graphene prepared by the existing chemical exfoliation method, which cannot take advantage of its huge specific surface area, and at the same time, the problem of poor cycle stability of cobalt tetroxide, and provides a method for preparing a flexible electrode with a three-dimensional hybrid structure of cobalt tetroxide / graphene

Method used

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  • Preparation method of cobaltosic oxide/graphene three-dimensional mixed structure flexible electrode

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specific Embodiment approach 1

[0019] Specific embodiment 1: The preparation method of a kind of three-dimensional cobalt tetroxide / graphene mixed structure flexible electrode described in this embodiment is specifically carried out according to the following steps:

[0020] 1. Under the condition of rotating speed of 3000 rpm to 5000 rpm, centrifuge the graphene oxide solution for 2 min to 10 min, then ultrasonically treat it for 10 min to 30 min, filter impurities, and obtain a pretreated graphene oxide solution;

[0021] The concentration of the graphene oxide solution is 0.1mg / mL~1mg / mL;

[0022] 3. ①. At room temperature, place nickel foam in the pretreated graphene oxide solution to react for 1min to 5min, and then dry it in a vacuum oven at a temperature of 50°C to 100°C for 3min to 10min to obtain the reacted material ; ②, at room temperature, place the reacted material in the pretreated graphene oxide solution for 1min to 5min, and then dry it in a vacuum oven at a temperature of 50°C to 100°C for ...

specific Embodiment approach 2

[0029] Embodiment 2: This embodiment differs from Embodiment 1 in that: the nickel foam described in Step 2 ① is ultrasonically cleaned with dilute hydrochloric acid for 5 minutes, acetone for 5 minutes and deionized water for 5 minutes. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0030] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step three, the sealed reaction kettle is placed in an oven with a temperature of 75°C to 210°C for 2h to 7h to obtain foamed nickel Material. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a preparation method of a composite electrode material, in particular, a preparation method of a cobaltosic oxide / graphene three-dimensional mixed structure flexible electrode. The objective of the invention is to solve the problems of high possibility of superposition and incapability of exerting the advantage of a specific surface area of graphene as well as poor cycling stability of cobaltosic oxide in an existing chemical stripping method for preparing an electrode material. The method of the invention includes the following steps that: a pretreated graphene oxide solution is prepared; a three-dimensional structure graphene / foam nickel material is prepared; and 3, cobaltous acetate, hexamethylene tetramine and the three-dimensional structure graphene / foam nickel material are subjected to a reaction, and washing is performed, and as a result, the cobaltosic oxide / graphene three-dimensional mixed structure flexible electrode can be obtained.

Description

technical field [0001] The invention relates to a preparation method of a composite electrode material. Background technique [0002] With the continuous emergence of more and more consumer electronics products such as smartphones, tablet computers, and portable readers, the demand for flexible energy storage devices is increasing day by day. Among many flexible energy storage devices, supercapacitors have attracted extensive attention due to their high power density, high efficiency, long service life and light pollution. At present, the development of electrode materials for flexible supercapacitors faces the problems of low specific capacitance and low energy density. Therefore, the development of a flexible electrode material with high specific capacitance and high energy density is the focus of current research. [0003] Graphene is a new type of carbon nanomaterial, which has the advantages of excellent electrical conductivity, excellent mechanical properties, high c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/46H01G11/86H01G11/36
Inventor 亓钧雷林景煌刘瑜琳张骜天冯吉才
Owner HARBIN INST OF TECH
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