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Six-membered ring-shaped cobalt oxyhydroxide/graphene nanometer composite material and preparation method thereof

A nanocomposite material, cobalt oxyhydroxide technology, applied in nanotechnology, nanotechnology, hybrid/electric double layer capacitor manufacturing and other directions, can solve the problems of cobalt oxyhydroxide irregular morphology, wide particle size distribution, complex process, etc. The product shape and particle size are controllable, easy to mass-produce, and the process energy consumption is low.

Active Publication Date: 2018-05-08
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN201310375503.2 discloses a synthesis process of nano-scale cobalt oxyhydroxide, but the obtained cobalt oxyhydroxide has irregular morphology and wide particle size distribution
In patent CN201210016504.3, after CoOOH is prepared, granulation needs to be carried out in a spray dryer, which increases equipment and complicates the process
There is no report about the six-membered ring cobalt oxyhydroxide / graphene nanocomposite material and its preparation method

Method used

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  • Six-membered ring-shaped cobalt oxyhydroxide/graphene nanometer composite material and preparation method thereof
  • Six-membered ring-shaped cobalt oxyhydroxide/graphene nanometer composite material and preparation method thereof
  • Six-membered ring-shaped cobalt oxyhydroxide/graphene nanometer composite material and preparation method thereof

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Experimental program
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Embodiment 1

[0028] (1) Prepare 25 mL of cobalt chloride aqueous solution with a concentration of 0.025 mol / L and 2 mg / mL graphene aqueous solution, mix well, transfer to a three-necked flask, feed nitrogen into the three-necked flask in advance, and mechanically stir for 4 hours at room temperature; ( 2) Prepare 50 mL of aqueous sodium hydroxide solution with a concentration of 0.25 mol / L, pour it into a three-necked flask at a flow rate of 5 mL / min, and react for 1 h at 50 ° C under stirring conditions; (3) remove the N 2 , add 10ml of hydrogen peroxide with a mass fraction of 28%, and age for 2h; (4) after aging, the resulting suspension is filtered, washed, and dried, and its SEM image is shown in figure 1 , to prepare six-membered ring cobalt oxyhydroxide / graphene nanocomposites.

Embodiment 2

[0030] (1) Prepare 25 mL of cobalt chloride aqueous solution with a concentration of 0.025 mol / L and 2 mg / mL graphene aqueous solution, mix well, transfer to a three-necked flask, feed nitrogen into the three-necked flask in advance, and mechanically stir for 4 hours at room temperature; ( 2) Prepare 50 mL of aqueous sodium hydroxide solution with a concentration of 0.25 mol / L, pour it into a three-necked flask at a flow rate of 5 mL / min, and react for 2 h at 50 ° C under stirring conditions; (3) remove the N 2 , add 10ml of hydrogen peroxide with a mass fraction of 28%, and age for 3.5h; (4) after aging, the resulting suspension is filtered, washed, and dried, and its SEM image is shown in figure 2 , its XRD pattern is shown in image 3 , to prepare six-membered ring cobalt oxyhydroxide / graphene nanocomposites.

Embodiment 3

[0032] (1) Configure 25ml of cobalt chloride aqueous solution with a concentration of 0.05mol / L and 2mg / mL graphene aqueous solution, mix well, transfer to a three-necked flask, feed nitrogen into the three-necked flask in advance, and mechanically stir at room temperature for 4h; ( 2) Prepare 50 mL of aqueous sodium hydroxide solution with a concentration of 0.25 mol / L, pour it into a three-necked flask at a flow rate of 5 mL / min, and react for 1 h at 50 ° C under stirring conditions; (3) remove the N 2 , add 10ml of hydrogen peroxide with a mass fraction of 28%, and age for 2h; (4) after aging, the resulting suspension is filtered, washed, and dried, and its SEM image is shown in Figure 4 , to prepare six-membered ring cobalt oxyhydroxide / graphene nanocomposites.

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Abstract

The invention relates to a preparation method of a six-membered ring-shaped cobalt oxyhydroxide / graphene nanometer composite material, and belongs to the field of inorganic materials. The specific process of the preparation method comprises the following steps: (1) mixing a cobalt salt water solution with a graphene water solution in a certain proportion, and stirring for a certain period of timeunder inert gas and room temperature conditions; (2) adding a strong alkali water solution, and reacting for a certain period of time; (3) removing inert gas, adding a strong oxidant, and aging for acertain period of time; and (4) after aging is finished, filtering, washing and drying an obtained suspension to obtain the six-membered ring-shaped cobalt oxyhydroxide / graphene nanometer composite material. The preparation method has the advantages of simple technological process, mild reaction condition, easy large-scale preparation and the like, the obtained product is controllable in morphology, and cobalt oxyhydroxide is uniformly dispersed on the surface of graphene, so that the material is expected to be applied in the fields of supercapacitors, lithium ion batteries, catalysts and thelike.

Description

technical field [0001] The invention belongs to the field of inorganic materials, and in particular relates to a six-membered ring cobalt oxyhydroxide / graphene nanocomposite material and a preparation method thereof. technical background [0002] With the rapid development of economy and society, the world today has higher and higher requirements for energy storage devices. Therefore, it is urgent to prepare high-performance lithium-ion batteries and electrochemical capacitors, and improve the effective utilization rate and storage efficiency of energy. . Among them, electrode materials are the key to the performance of energy storage devices. Lithium cobaltate is currently the most commonly used electrode material for lithium-ion batteries because of its advantages such as high discharge voltage, stable charge and discharge voltage, and high specific energy. Cobalt oxides (cobalt oxide, cobalt tetroxide, cobalt oxyhydroxide, and cobaltous hydroxide) are one of the common ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/62H01G11/24H01G11/46H01G11/86B82Y30/00
CPCB82Y30/00H01G11/24H01G11/46H01G11/86H01M4/362H01M4/52H01M4/625Y02E60/10Y02E60/13
Inventor 杨梅陈会会陈光文陶莎
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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