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Amorphous state ferriferrous oxide/graphene aerogel composite material and preparation method and application thereof

A technology of graphene airgel and ferroferric oxide, which is applied in the field of nanomaterials and electrochemistry, can solve the problems of large volume change, low conductivity, and limited application, and achieve reduced impedance, stable rate performance, and low equipment requirements Effect

Active Publication Date: 2016-06-01
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the Fe3O4 material has low electrical conductivity, and there is a large volume change during the lithium ion intercalation process, which causes the failure of the material and greatly limits its application.

Method used

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  • Amorphous state ferriferrous oxide/graphene aerogel composite material and preparation method and application thereof
  • Amorphous state ferriferrous oxide/graphene aerogel composite material and preparation method and application thereof
  • Amorphous state ferriferrous oxide/graphene aerogel composite material and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1. Take 30 mL of graphene oxide dispersion, containing about 120 mg of graphene oxide, stir and sonicate for 20 minutes to obtain a uniform suspension;

[0027] Step 2. Add 0.25 g (1.3 mmol) of ferrous chloride tetrahydrate and 0.5 g of sodium ascorbate to the suspension obtained in step 1, and stir for 10 min;

[0028] In step 3, the mixed solution obtained in step 2 was left to stand at 50° C. for 4 hours to form a reduced graphene hydrogel.

[0029] Step 4, transfer the hydrogel obtained in step 3 (remove the excess liquid other than the hydrogel) to 200mL30wt% ammonia water, and leave it for 1h to obtain the amorphous iron ferric oxide / graphene hydrogel composite material. The material is freeze-dried to obtain the amorphous Fe3O4 / graphene airgel composite material.

Embodiment 2

[0031] Step 1. Take 30 mL of graphene oxide dispersion, containing about 120 mg of graphene oxide, stir and sonicate for 20 minutes to obtain a uniform suspension;

[0032] Step 2. Add 0.5 g of ferrous chloride tetrahydrate and 1 g of sodium ascorbate to the suspension obtained in step 1, and stir for 10 min;

[0033] In step 3, the mixed solution obtained in step 2 is allowed to stand at 50° C. for 10 h to form a reduced graphene hydrogel.

[0034] Step 4, transfer the hydrogel obtained in step 3 (remove the excess liquid other than the hydrogel) to 200mL30wt% ammonia water, and leave it for 2h to obtain the amorphous iron ferric oxide / graphene hydrogel composite material. The material is freeze-dried to obtain the amorphous Fe3O4 / graphene airgel composite material.

Embodiment 3

[0036] Step 1. Take 30 mL of graphene oxide dispersion, containing about 120 mg of graphene oxide, stir and sonicate for 20 minutes to obtain a uniform suspension;

[0037] Step 2. Add 1 g of ferrous chloride tetrahydrate and 1.5 g of sodium ascorbate to the suspension obtained in step 1, and stir for 10 min;

[0038] In step 3, the mixed solution obtained in step 2 was left to stand at 50° C. for 8 hours to form a reduced graphene hydrogel.

[0039] Step 4. Transfer the hydrogel obtained in step 3 (remove the excess liquid other than the hydrogel) to 200mL NaOH solution (0.4g / mL), and let it stand for 2h to obtain the amorphous ferric oxide / graphene hydrogel Glue composite material, the material is freeze-dried to obtain the amorphous iron ferric oxide / graphene airgel composite material.

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Abstract

The invention discloses a preparation method of an amorphous state ferriferrous oxide / graphene aerogel composite material. The method comprises the following steps: (1) stirring and ultrasonically processing taken graphene oxide dispersion liquid for 20 minutes to obtain a homogeneous suspension liquid; (2) adding a bivalent iron source and sodium ascorbate to the suspension liquid and stirring the bivalent iron source and the sodium ascorbate for 10 minutes; (3) standing the obtained mixed liquid at 40-50 DEG C for more than 4h, and forming a reduced graphene hydrogel; and (4) transferring the obtained hydrogel into a strong alkaline solution of which the pH is greater than 11 after removing excessive liquid except for the hydrogel, completely immersing the hydrogel into the strong alkaline solution and standing the hydrogel for more than 0.5h to obtain the amorphous state ferriferrous oxide / graphene aerogel composite material. The invention further discloses the composite material and an application thereof. The method for preparing an anode material for a lithium-ion battery is simple in process, easy to operate and safe and environment-friendly in process, and has great industrialization potential.

Description

technical field [0001] The invention relates to a composite material and a preparation method thereof, in particular to an amorphous iron ferric oxide / graphene airgel composite material and a preparation method thereof, belonging to the technical field of nanomaterials and electrochemistry, and the invention also relates to the Application of composite materials in high-rate lithium-ion battery anode materials. Background technique [0002] With the depletion of petroleum resources, promoting the development of renewable energy has significant social and economic benefits. Among the new energy storage technologies based on chemical energy storage, lithium ions have the advantages of high open circuit voltage, long cycle life, high energy density, no memory effect, and environmental friendliness. Compared with other secondary batteries (Ni-MH batteries, Lead-acid batteries, nickel-cadmium batteries) incomparable advantages such as superior electrical performance and variable...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M10/0525
CPCH01M4/366H01M4/523H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 杨伟梁成露刘洋包睿莹谢邦互杨鸣波
Owner SICHUAN UNIV
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