Preparation method of graphene-based compact composite material

Abstract

The invention belongs to the technical field of energy storage, and particularly relates to a preparation method of a graphene-based compact composite material. The preparation method at least comprises the following steps of adding a dispersing liquid of an insoluble constituent into a graphene dispersing liquid, and performing full stirring to obtain a first mixed dispersing liquid; adding a reduction constituent, and performing full stirring to obtain a second mixed dispersing liquid; adding to a hydrothermal reaction kettle for hydrothermal reaction to obtain hydrogel; fully immersing thehydrogel in deionized water, removing impurity, performing evaporation, drying and moisture removal to obtain a product to be processed; and performing high-temperature thermal processing, and furtherremoving an oxygen-containing functional group to obtain the three-dimensional compact composite material. The pre-arrangement effect of the insoluble constituent during the rapid and compact formation process of a graphene network is promoted by the reduction constituent, gaps among other insoluble constituent particles are reduced by a shrinkage effect of the three-dimensional graphene networkduring the solvent removal process, material compactness is achieved, so that the composite material with relatively high density is obtained.

Description

technical field

[0001] The invention belongs to the field of energy storage technology (battery, supercapacitor), and in particular relates to a preparation method of a graphene-based dense composite material. Background technique

[0002] As a typical two-dimensional flexible carbon material, graphene has a large specific surface area, high reactivity, high electrochemical capacity, and good conductivity, and has a good application prospect in the field of energy storage. For example, it can be used as an electrode material in supercapacitors, as a conductive additive in alkaline metal ion batteries (such as lithium-ion batteries, sodium-ion batteries, potassium-ion batteries, etc.), and as an active material in lithium-sulfur and lithium-air batteries. An effective carrier to build a conductive network. At the same time, assembling two-dimensional graphene into a three-dimensional graphene assembly, supplemented by other technical means, can obtain ultra-light, ultra-hard...

Examples

Embodiment 1

[0035] The present embodiment provides a kind of preparation method of graphene-based dense composite material, comprises the following steps at least:

[0036] In the first step, 38.5mL of 2mg / mL graphene oxide dispersion (solvent is water) is placed in a 100mL beaker, and 38.5mL of 2mg / mL activated carbon dispersion (solvent is methanol) is added to the beaker, fully stirred (30min) obtain the first mixed dispersion liquid;

[0037] In the second step, adding the reducing component ethylenediamine to the first mixed dispersion liquid obtained in the first step, and fully stirring for 30 minutes to obtain the second mixed dispersion liquid;

[0038] In the third step, the second mixed dispersion obtained in the second step is added to a 100mL hydrothermal reaction kettle for hydrothermal reaction. The temperature of the hydrothermal reaction is 150°C, and the duration of the hydrothermal reaction is 6h to obtain graphene / Activated carbon composite hydrogel;

[0039] The fo...

Embodiment 2

[0045] The present embodiment provides a kind of preparation method of graphene-based dense composite material, comprises the following steps at least:

[0046] In the first step, 38.5mL of 3mg / mL modified graphene dispersion (solvent is water) is placed in a 100mL beaker, and 38.5mL of 4mg / mL mesoporous carbon dispersion (solvent is ethanol) is added to the beaker, Thoroughly stir (60min) to obtain the first mixed dispersion liquid;

[0047] In the second step, add reducing component urea to the first mixed dispersion liquid obtained in the first step, and fully stir for 60 minutes to obtain the second mixed dispersion liquid;

[0048] In the third step, the second mixed dispersion obtained in the second step is added to a 100mL hydrothermal reaction kettle for hydrothermal reaction. The temperature of the hydrothermal reaction is 170°C, and the duration of the hydrothermal reaction is 10h to obtain graphene / Mesoporous carbon composite hydrogels;

[0049] The fourth step i...

Embodiment 3

[0052] The present embodiment provides a kind of preparation method of graphene-based dense composite material, comprises the following steps at least:

[0053] The first step, 38.5mL 5mg / mL porous graphene dispersion (solvent is water) is placed in 100mL beaker, in this beaker, add 38.5mL 3mg / mL carbon fiber dispersion (solvent is acetone), fully stir ( 40min) to obtain the first mixed dispersion;

[0054] In the second step, add the reducing component hydrazine hydrate to the first mixed dispersion liquid obtained in the first step, and fully stir for 50 minutes to obtain the second mixed dispersion liquid;

[0055] In the third step, the second mixed dispersion obtained in the second step is added to a 100mL hydrothermal reaction kettle for hydrothermal reaction. The temperature of the hydrothermal reaction is 140°C, and the duration of the hydrothermal reaction is 30h to obtain graphene / Carbon fiber composite hydrogel;

[0056] The fourth step is to fully soak the hydro...

technical field

[0001] The invention belongs to the field of energy storage technology (battery, supercapacitor), and in particular relates to a preparation method of a graphene-based dense composite material. Background technique

[0002] As a typical two-dimensional flexible carbon material, graphene has a large specific surface area, high reactivity, high electrochemical capacity, and good conductivity, and has a good application prospect in the field of energy storage. For example, it can be used as an electrode material in supercapacitors, as a conductive additive in alkaline metal ion batteries (such as lithium-ion batteries, sodium-ion batteries, potassium-ion batteries, etc.), and as an active material in lithium-sulfur and lithium-air batteries. An effective carrier to build a conductive network. At the same time, assembling two-dimensional graphene into a three-dimensional graphene assembly, supplemented by other technical means, can obtain ultra-light, ultra-hard...

Examples

Embodiment 1

[0035] The present embodiment provides a kind of preparation method of graphene-based dense composite material, comprises the following steps at least:

[0036] In the first step, 38.5mL of 2mg / mL graphene oxide dispersion (solvent is water) is placed in a 100mL beaker, and 38.5mL of 2mg / mL activated carbon dispersion (solvent is methanol) is added to the beaker, fully stirred (30min) obtain the first mixed dispersion liquid;

[0037] In the second step, adding the reducing component ethylenediamine to the first mixed dispersion liquid obtained in the first step, and fully stirring for 30 minutes to obtain the second mixed dispersion liquid;

[0038] In the third step, the second mixed dispersion obtained in the second step is added to a 100mL hydrothermal reaction kettle for hydrothermal reaction. The temperature of the hydrothermal reaction is 150°C, and the duration of the hydrothermal reaction is 6h to obtain graphene / Activated carbon composite hydrogel;

[0039] The fo...

Embodiment 2

[0045] The present embodiment provides a kind of preparation method of graphene-based dense composite material, comprises the following steps at least:

[0046] In the first step, 38.5mL of 3mg / mL modified graphene dispersion (solvent is water) is placed in a 100mL beaker, and 38.5mL of 4mg / mL mesoporous carbon dispersion (solvent is ethanol) is added to the beaker, Thoroughly stir (60min) to obtain the first mixed dispersion liquid;

[0047] In the second step, add reducing component urea to the first mixed dispersion liquid obtained in the first step, and fully stir for 60 minutes to obtain the second mixed dispersion liquid;

[0048] In the third step, the second mixed dispersion obtained in the second step is added to a 100mL hydrothermal reaction kettle for hydrothermal reaction. The temperature of the hydrothermal reaction is 170°C, and the duration of the hydrothermal reaction is 10h to obtain graphene / Mesoporous carbon composite hydrogels;

[0049] The fourth step i...

Embodiment 3

[0052] The present embodiment provides a kind of preparation method of graphene-based dense composite material, comprises the following steps at least:

[0053] The first step, 38.5mL 5mg / mL porous graphene dispersion (solvent is water) is placed in 100mL beaker, in this beaker, add 38.5mL 3mg / mL carbon fiber dispersion (solvent is acetone), fully stir ( 40min) to obtain the first mixed dispersion;

[0054] In the second step, add the reducing component hydrazine hydrate to the first mixed dispersion liquid obtained in the first step, and fully stir for 50 minutes to obtain the second mixed dispersion liquid;

[0055] In the third step, the second mixed dispersion obtained in the second step is added to a 100mL hydrothermal reaction kettle for hydrothermal reaction. The temperature of the hydrothermal reaction is 140°C, and the duration of the hydrothermal reaction is 30h to obtain graphene / Carbon fiber composite hydrogel;

[0056] The fourth step is to fully soak the hydro...

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