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A kind of preparation method of graphene@coal-ldh composite electrode material

A composite electrode and graphene technology, applied in the direction of hybrid capacitor electrodes, etc., can solve problems such as easy agglomeration and poor conductivity of double metal hydroxides, achieve high specific capacitance, overcome poor cycle performance, and excellent charge and discharge performance Effect

Active Publication Date: 2022-04-01
SHANGHAI INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method is simple to operate and environmentally friendly, and the obtained graphene@CoAl-LDH composite electrode material can solve the shortcomings of the double metal hydroxide in the prior art, such as poor electrical conductivity and easy agglomeration, and at the same time, the composite electrode material has a good cycle Stability and Mechanical Flexibility

Method used

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  • A kind of preparation method of graphene@coal-ldh composite electrode material
  • A kind of preparation method of graphene@coal-ldh composite electrode material
  • A kind of preparation method of graphene@coal-ldh composite electrode material

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preparation example Construction

[0029] A preparation method of graphene@CoAl-LDH composite electrode material, obtain graphene oxide aerogel by freeze-drying; prepare CoAl mixed solution; carry out hydrothermal reaction of graphene aerogel and CoAl mixed solution, wait for temperature Cool down to room temperature for freeze-drying to obtain graphene@CoAl-LDH composite electrode material, the specific steps are as follows:

[0030] (1) Preparation of graphene oxide airgel

[0031] Graphene oxide was prepared by the improved Hummer method, the prepared graphene oxide and deionized water were mixed according to the mass ratio of 1:2-3:2 and ultrasonically treated for 1-2h, and then the graphene oxide aqueous solution was frozen Dry for 1-8 hours to obtain graphene oxide airgel.

[0032] (2) Preparation of CoAl mixed solution

[0033] Cobalt salt and deionized water are mixed according to 2mg:1ml-20mg:1ml for 15-30min, aluminum salt and deionized water are mixed according to 2mg:1ml-10mg:1ml for 15-30min, and...

Embodiment 1

[0038] A preparation method of graphene@CoAl-LDH composite electrode material, comprising the steps of:

[0039] (1) Preparation of graphene oxide airgel

[0040] Utilize improved Hummer method to prepare graphene oxide, will prepare graphene oxide and deionized water according to the ratio of 1:2, sonicate 1h, freeze-dry 1h, obtain required graphene oxide airgel.

[0041](2) Preparation of CoAl mixed solution

[0042] Prepare the solution of cobalt nitrate and deionized water according to 4mg-1ml, stir for 15min; prepare the solution of aluminum nitrate and deionized water according to 4mg-1ml, stir for 15min; mix the solution of cobalt nitrate and aluminum nitrate according to 5:1, stir for 15min, To obtain a mixed CoAl solution; add cobalt nitrate and urea in a ratio of 1:1; add cobalt nitrate and ammonium fluoride in a ratio of 6:1; add cobalt nitrate and CTAB in a ratio of 4:1; solution.

[0043] (3) Preparation of graphene@CoAl-LDH composite electrode material

[004...

Embodiment 2

[0049] A preparation method of graphene@CoAl-LDH composite electrode material, comprising the steps of:

[0050] (1) Preparation of graphene oxide airgel

[0051] Utilize the modified Hummer method to prepare graphene oxide, prepare graphene oxide and deionized water according to the ratio of 1:1, sonicate for 1.5h, and freeze-dry for 1.5h to obtain the required graphene oxide airgel.

[0052] (2) Preparation of CoAl mixed solution

[0053] Prepare the solution of cobalt nitrate and deionized water according to 10mg-1ml, and stir for 20min; prepare the solution of aluminum nitrate and deionized water according to 10mg-1ml, and stir for 20min; Mixed CoAl solution is obtained; cobalt nitrate and urea are added in a ratio of 1:2; cobalt nitrate and ammonium fluoride are added in a ratio of 8:1; cobalt nitrate and CTAB are added in a ratio of 3:1; the required CoAl mixture is obtained solution.

[0054] (3) Preparation of graphene@CoAl-LDH composite electrode material

[0055]...

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Abstract

The invention relates to a preparation method of a graphene@CoAl‑LDH composite electrode material, in which graphene oxide airgel is obtained by freeze-drying; a mixed solution of CoAl is prepared; and a mixed solution of graphene airgel and CoAl is subjected to a hydrothermal reaction , after the temperature dropped to room temperature, freeze-dried to obtain graphene@CoAl-LDH composite electrode material. Compared with the prior art, the preparation method of the graphene@CoAl‑LDH composite electrode material obtained by the present invention is simple and environmentally friendly, and the cost is controllable, which can be used in the research of energy storage of green energy materials.

Description

technical field [0001] The invention belongs to the field of material chemical energy storage, in particular to a method for preparing a graphene@CoAl-LDH composite electrode material. Background technique [0002] In recent years, with the continuous advancement of technology, the energy consumption required is increasing. The non-negligible energy depletion and environmental pollution caused by it have attracted great attention. Efforts are being made to develop new devices with higher storage performance to solve this problem effectively. Supercapacitors have been widely studied as the next generation of energy storage, mainly because of their high power density, fast charge and discharge, small size, and long cycle life performance. These impressive properties of supercapacitors can be widely used in hybrid electric vehicles, batteries, solar energy conversion and other renewable energy sources. However, the low energy density of current commercial supercapacitors lim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/36H01G11/46
CPCH01G11/30H01G11/36H01G11/46H01G11/24Y02E60/13
Inventor 韩生赵豆豆常兴常伟薛原
Owner SHANGHAI INST OF TECH
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