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Cobaltosic oxide/ carbon composite electrode material, manufacturing method and application

A technology of tricobalt tetroxide and electrode materials, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problems of low specific capacity and poor rate performance, and achieve the effect of increased specific capacity, excellent performance and reduced impedance

Inactive Publication Date: 2018-06-22
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

[0004] In order to solve the disadvantages of low specific capacity and poor rate performance in the actual application of the cobalt tetroxide electrode material using ZIF-67 as the precursor in the prior art, the purpose of the present invention is to propose a method for preparing cobalt tetroxide / carbon composite electrode material, To overcome the limitations of the application of tricobalt tetroxide

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  • Cobaltosic oxide/ carbon composite electrode material, manufacturing method and application
  • Cobaltosic oxide/ carbon composite electrode material, manufacturing method and application
  • Cobaltosic oxide/ carbon composite electrode material, manufacturing method and application

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preparation example Construction

[0024] First, the preparation method of ZIF-67 is described as follows:

[0025] 1.43g cobalt nitrate hexahydrate (Co(NO) 2 ·6H 2 O) and 3.24g of dimethylimidazole were dissolved in 100ml of methanol respectively, after fully dissolving, the two solutions were directly mixed and kept stirring for 20min. The mixed solution was aged at room temperature for 24 hours, and then repeatedly washed by suction filtration with methanol to obtain purple ZIF-67, which was finally dried in a vacuum oven at 150° C. for 8 hours.

Embodiment 1

[0027] The obtained ZIF-67 was placed in a porcelain ark, heated to 600°C in a tube furnace with a nitrogen atmosphere at a heating rate of 5°C min-1, kept for 2 hours, and then naturally cooled to room temperature. Afterwards, the airtightness of the tube furnace flange was opened, the atmosphere was connected, and the temperature was raised to 300°C at a rate of 5°C min-1 for 2 hours to obtain the carbonized ZIF-67, that is, sample 1.

Embodiment 2

[0029] 0.2 g of ZIF-67 obtained, and 1.5 g of cetyltrimethylammonium bromide (CTAB) were fully dissolved in a mixed solution of 30 ml of ethanol and 9 ml of deionized water. After fully stirring for 30 minutes, add 0.105g of resorcinol and 0.12ml of concentrated ammonia water, continue stirring for 30min and then add 0.15ml of formaldehyde. After reacting for 6 hours under stirring conditions, the product ZIF-67@phenolic resin (PR) was collected by centrifugation and dried overnight in an oven at 80°C. Then the obtained ZIF-67@PR composite was heated to 600 °C in a tube furnace with nitrogen atmosphere at a heating rate of 5 °C min-1, kept for 2 h, and then naturally cooled to room temperature. Afterwards, the tube furnace flange airtight is opened, the atmosphere is connected, and the temperature is raised to 300° C. for 2 hours at a rate of 5° C. min −1 again to obtain tricobalt tetroxide / carbon (Co 3 o 4 / C) Composite electrode material, namely sample 2.

[0030] The mor...

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Abstract

The invention provides the manufacturing method of a cobaltosic oxide / carbon composite electrode material. The method is characterized by taking a Co-MOFs crystal ZIF-67 manufactured by a cobalt saltand dimethylimidazole as a precursor; coating a uniform layer of phenolic resin (PR) on the external in situ of ZIF-67 nano-particles; and then, under a specific condition, carrying out high temperature processing for twice and acquiring a cobaltosic oxide / carbon composite electrode. Through the coating of a phenolic resin, a sample can still keep a good normal polyhedron structure when the ZIF-67 is subjected to high temperature calcination. The carbonization of the phenolic resin greatly enhances the specific surface area and the electrochemical activity of the nanoparticles. A carbon shell formed by a phenolic resin precursor presents a higher degree of graphitization and higher conductivity than that of amorphous carbon. A composite electrode structure can greatly improve the specific capacity, the energy density and the cycling stability of the electrode, and is expected to have a good application prospect in the field of supercapacitor materials.

Description

technical field [0001] The invention belongs to the field of new energy materials, and in particular relates to the preparation of a cobalt trioxide / carbon composite electrode material, which can be used as an electrode material for supercapacitors. Background technique [0002] Supercapacitor is a new type of green energy storage device, which has many significant advantages, such as high power density at high charge and discharge rates, long service life (>100,000 times), and wide operating temperature range, etc. It has attracted extensive attention and application of researchers. These advantages of supercapacitors make them have good application prospects in the fields of green energy, mobile energy systems, hybrid electric vehicles, storage backup systems, and military equipment. However, current supercapacitors still have many disadvantages, the most notable of which is relatively low energy density, which limits the practical application of supercapacitors. Elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/46H01G11/32H01G11/86
CPCH01G11/32H01G11/46H01G11/86Y02E60/13
Inventor 程起林葛鑫进徐晨辉何颖
Owner EAST CHINA UNIV OF SCI & TECH
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