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Preparation method of graphene-based thick and dense electrode

A graphene-based, graphene-based technology, applied in the field of graphene, can solve the problems of low volumetric energy density of electrochemical energy storage devices, easy agglomeration of graphene electrode materials, hindered electrolyte ion transmission, etc., to achieve rapid charge and discharge characteristics, impurity The effect of less, high yield

Active Publication Date: 2016-08-17
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Description
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  • Application Information

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Problems solved by technology

[0007] The problem to be solved by the present invention is that in the prior art, the graphene electrode material is easy to agglomerate, the transmission of electrolyte ions in the thick and dense electrode is hindered, and the technical problem of the low volumetric energy density of the electrochemical energy storage device

Method used

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  • Preparation method of graphene-based thick and dense electrode
  • Preparation method of graphene-based thick and dense electrode

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preparation example Construction

[0035] The invention provides a kind of preparation method of graphene-based thick and dense electrode, it comprises the following steps:

[0036] (1) Preparation of graphene hydrogel

[0037] It can be understood that in order to make the graphene sheets overlap and cross-link more fully to form a three-dimensional structure, the selected graphene derivatives are selected from at least one of graphene oxide, modified graphene, and porous graphene.

[0038] In an embodiment of the present invention, graphene oxide is preferred.

[0039] The reduction method includes: hydrothermal reduction, chemical reduction, and the chemical reducing agent used includes (at least one of hydrazine hydrate, urea, thiourea, hydroiodic acid, sodium citrate, and sodium bisulfite).

[0040]In an embodiment of the present invention, hydrothermal reduction is preferred among the reduction methods.

[0041] (2) Compounding of graphene and salt components

[0042] The selected salt composition shou...

Embodiment 1

[0057] (1) Preparation of graphene hydrogel

[0058] 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.

[0059] (2) Compounding of graphene and salt components

[0060] Soak the above-mentioned graphene hydrogel in 20mL 0.5M zinc chloride aqueous solution for 12h, then take out the graphene hydrogel, at this time, zinc chloride is adsorbed on the graphene sheet of the hydrogel, and the graphene hydrogel The glue was dried under vacuum at 70°C for 24 hours to obtain a composite of zinc chloride and graphene.

[0061] (3) The salt component generates gas to regulate the pore structure of the ...

Embodiment 2

[0066] Embodiment 2: The concentration of the zinc chloride aqueous solution in embodiment 1 is adjusted to 0.1M, and the rest is the same as embodiment 1.

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Abstract

The invention discloses a preparation method of a graphene-based thick and dense electrode. The method comprises the following steps of preparation of graphene hydrogel, compounding of graphene and a salt component, aerogenesis and removal of the salt component and preparation of the graphene-based thick and dense electrode. According to the method, a three-dimensional porous graphene block material is prepared according to the pore-forming effect of aerogenesis salt on a graphene network in the heating process. Compared with other pore-forming methods, the aerogenesis salt does not etch graphene in the heating process, the yield of the graphene is high, and the method is suitable for batch production of the porous graphene material; gas generated after heating is removed, and therefore the obtained graphene has few impurities and is high in purity; a small quantity of remaining impurities occupy pores of the graphene, and a secondary pore-forming effect is achieved on the graphene network after washing. The graphene is of a three-dimensional formed block structure and can be directly applied to an electrode material, the electrode has large thickness and density, and the processing step of preparing the electrode from powdery graphene is avoided.

Description

technical field [0001] The invention relates to a preparation method and application of a graphene-based "high-thickness" and "high-density" electrode, belonging to the technical field of graphene. Background technique [0002] Graphene is sp with a two-dimensional honeycomb lattice structure 2 Hybrid single-layer carbon atom crystals, which are uneven, wrinkled two-dimensional crystals, are thought to be the building blocks of other sp 2 The basic unit of carbonaceous materials. Graphene has excellent electrical, thermal, mechanical, and optical properties, which has aroused people's research boom in recent years. [0003] Due to its microscopic and nanoscale, graphene material has a high active specific surface area, high reactivity and high electrochemical capacity, which shows great advantages in the field of electrochemical energy storage. Although the graphene material itself has a high energy density, the performance of graphene-based energy storage devices is not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/36
CPCH01G11/36H01G11/86
Inventor 杨全红李欢罗加严游从辉陶莹刘东海吕伟吴思达康飞宇
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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