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Preparation method for graphene@CoAl-LDH composite electrode material

A composite electrode and graphene technology, applied in hybrid capacitor electrodes and other directions, can solve problems such as easy agglomeration and poor conductivity of bimetallic oxides, achieve high specific capacitance, overcome poor cycle performance, and excellent charge and discharge performance.

Active Publication Date: 2019-12-13
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • 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 prior art, such as poor electrical conductivity and easy agglomeration of double metal oxides, and the composite electrode material has good cycle stability Sexuality and Mechanical Flexibility

Method used

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  • Preparation method for graphene@CoAl-LDH composite electrode material
  • Preparation method for graphene@CoAl-LDH composite electrode material
  • Preparation method for graphene@CoAl-LDH composite electrode material

Examples

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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] Graphene oxide was prepared by the modified Hummer method, and the prepared graphene oxide and deionized water were treated in a ratio of 1:2, sonicated for 1 h, and freeze-dried for 1 h to obtain the desired graphene oxide aerogel.

[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; obtain the desired CoAl mixture solution.

[0043] (3) Preparat...

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] Graphene oxide was prepared by the improved Hummer method, and the prepared graphene oxide and deionized water were treated in a ratio of 1:1, sonicated for 1.5 h, and freeze-dried for 1.5 h to obtain the desired graphene oxide aerogel.

[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; To obtain a mixed CoAl solution; add cobalt nitrate and urea in a ratio of 1:2; add cobalt nitrate and ammonium fluoride in a ratio of 8:1; add cobalt nitrate and CTAB in a ratio of 3:1; obtain the required CoAl mixture solution.

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

[0055] The graphe...

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Abstract

The invention relates to a preparation method for a graphene@CoAl-LDH composite electrode material. Freeze drying is carried out to obtain graphene oxide aerogel; a mixed solution of CoAl is prepared;and the graphene aerogel and the CoAl mixed solution are subjected to hydrothermal reaction, and after the temperature is reduced to room temperature, freeze drying is carried out to obtain the graphene@CoAl-LDH composite electrode material. Compared with the prior art, the preparation method for the graphene@CoAl-LDH composite electrode material is simple and environmentally friendly, controllable in the cost, and can be used for research in the aspect of energy storage of green energy materials.

Description

technical field [0001] The invention belongs to the field of material chemical energy storage, and in particular relates to a preparation method of 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 problems 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 next-generation 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 supe...

Claims

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Application Information

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Patent Type & Authority Applications(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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