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Graphene electrode material with bottle-shaped apertures and preparation method thereof

A technology of graphene electrodes and graphene sheets, which is applied in the field of graphene, can solve the problems of electrochemical energy storage devices such as rate performance, insufficient cycle characteristics, and low volume energy density, so as to achieve improved volume energy density, high density, and The effect on preparation and processing

Active Publication Date: 2016-09-28
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problems of insufficient rate performance and cycle characteristics of electrochemical energy storage devices and low volumetric energy density

Method used

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  • Graphene electrode material with bottle-shaped apertures and preparation method thereof
  • Graphene electrode material with bottle-shaped apertures and preparation method thereof
  • Graphene electrode material with bottle-shaped apertures and preparation method thereof

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preparation example Construction

[0028] The present invention also provides a kind of preparation method of the graphene electrode material of bottle shape hole shape, and it comprises the following steps:

[0029] (1) Preparation of graphene hydrogel

[0030] The graphene oxide dispersion is subjected to hydrothermal reduction treatment to obtain a graphene hydrogel with a three-dimensional structure.

[0031] (2) Graphene is compounded with acidic components

[0032] The acidic component is at least one of sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, nitrous acid and metaphosphoric acid.

[0033] In an embodiment of the present invention, the acidic component is preferably one of sulfuric acid, phosphoric acid, and nitric acid.

[0034] The concentration c of the acidic solution is 0.01M-10M, and the soaking time t is 0.01h-48h. It can be understood that if the concentration of the acidic solution is too high or the soaking time is too long, the pore-forming effect of the acidic compon...

Embodiment 1

[0042] (1) Preparation of graphene hydrogel

[0043] Weigh 170 mg of graphite oxide powder material prepared by the improved Hummer method, add it to 85 mL of deionized water, and ultrasonically disperse it for 2 h at a power of 200 W to obtain 2 mg·mL -1 graphene oxide hydrosol. Put the above-mentioned hydrosol in a 100mL hydrothermal kettle, heat at 180°C for 6 hours; after the hydrothermal kettle cools down, pour out the water phase to obtain a hydrothermally reduced graphene hydrogel.

[0044] (2) Combination of graphene and acidic components

[0045] Soak the above-mentioned graphene hydrogel in 20mL 0.5M phosphoric acid aqueous solution for 12h, then take out the graphene hydrogel, at this moment, phosphoric acid is adsorbed on the graphene sheet of the hydrogel, put the graphene hydrogel in 70 Vacuum drying at ℃ for 24 hours to obtain a composite of phosphoric acid and graphene.

[0046] (3) Acidic component reacts with graphene at high temperature

[0047] Thereafter...

Embodiment 2

[0049] Embodiment 2: Adjust the concentration of phosphoric acid aqueous solution in embodiment 1 to 0.1M, and the rest are the same as embodiment 1.

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Abstract

The invention discloses a graphene electrode material with bottle-shaped apertures and a preparation method thereof. The material has a three dimensional porous structure which is overlapped by graphene sheets, the apertures are in bottle shape and comprise bottle body parts and bottleneck parts, wherein the diameter of the bottle body part of the aperture is larger than the diameter of the bottleneck part of the aperture. The diameter of the bottle body part of the aperture is 10-50nm, and the diameter of the bottleneck part of the aperture is 0.5-10nm. The preparation method comprises the following steps: graphene hydrogel is prepared; a composition of graphene and an acidic component is obtained; and a reaction is carried out between graphene and the acidic component at a high temperature. The graphene electrode material with bottle-shaped apertures can effectively restrict volume expansion of electrode active materials in charging and discharging process and shuttle phenomenon of charging and discharging products, in order to substantially improve cycle performance of electrochemistry energy storage devices. The material has a higher density, and volume energy density of energy storage devices is further improved. The material is a moulded block material, and processing steps for preparing electrodes from powder graphene are avoided.

Description

technical field [0001] The invention relates to a bottle-shaped hole-shaped graphene electrode material and its preparation, belonging to the technical field of graphene. Background technique [0002] Graphene is sp with a two-dimensional honeycomb lattice structure 2 A hybrid single-layer carbon atom crystal is a two-dimensional crystal with unevenness and wrinkles. Graphene has excellent thermal, electrical, optical, and mechanical properties, which have attracted extensive research in recent years. [0003] Due to its microscopic nanoscale, graphene material has high active specific surface area, high reactivity and high electrochemical capacity. In the application of electrode materials, it can not only contribute a large capacity, but also can be used as other electrode components good carrier. For example, in the application of lithium-sulfur batteries, the combination of graphene and sulfur can not only improve the conductivity of the sulfur cathode, but also impro...

Claims

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Application Information

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IPC IPC(8): C01B31/04
CPCC01B2204/22C01P2004/03
Inventor 杨全红李欢罗加严
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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