Lasagna nano graphene and preparation method and application thereof

A technology of nano-graphene and puff pastry, applied in the field of graphene, can solve the problems of not easy to increase the packing density, insufficient graphene yield, poor structural symmetry, etc., and achieve the effects of easy cost enlargement, small gap and low cost.

Inactive Publication Date: 2017-05-10
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor symmetry of its structure, holes will be left when pressing to form electrode sheets, making it difficult to increase the packing density.
At the same time, such a stacked structure is easily swollen by the electrolyte, causing the carbon nanomaterials to disperse in the device, which may lead to a short circuit of the tabs.
At the same time, the output of graphene grown by the template method is not high enough, resulting in high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation of thousand-layer cake-shaped nanographene includes the following operations:

[0038] Using nano-flaky kaolin with a thickness of 5 nm, immersed in a 0.1 mol / L glucose aqueous solution for 3 h, filtered, and compacted under a pressure of 40 MPa using a tablet machine.

[0039] The above product was placed in a reactor, and an oxygen-containing gas (the volume fraction of oxygen was 0.5%, the rest was nitrogen) was calcined at 550° C. for 1 h. In the above-mentioned product, the easily decomposable components escape, and the remaining material forms a porous cake-shaped oxide template; then the gas introduced is switched to argon, and a carbon source (C 8 ~C 15 Petroleum hydrocarbons) and carrier gas (a mixture of hydrogen and argon in a volume ratio of 1:0.6). The carbon source space velocity is 1.5g / g / h, the volume ratio of carbon source and carrier gas is 1:0.1, and the carbon source is cracked on the surface of the porous cake template at 1000 °C t...

Embodiment 2

[0045] The preparation of thousand-layer cake-shaped nanographene includes the following operations:

[0046] Use nano-sheet hydrated magnesium carbonate with a thickness of 100 nm, immerse it in a 1 mol / L starch aqueous solution for 3 h, filter it, and use a tablet machine to compact it under a pressure of 5 MPa.

[0047] The above product was placed in a reactor, and an oxygen-containing gas (the volume fraction of oxygen was 100%) was calcined at 200° C. for 0.2 h. The easily decomposable components in the above-mentioned products escape, and the remaining material forms a porous cake-shaped oxide template; then the gas is switched to argon, and a carbon source (C 1 ~C 7 Petroleum hydrocarbons) and carrier gas (mixture of hydrogen and nitrogen, 1:4 by volume). The carbon source space velocity was 0.5 g / g / h, the volume ratio of carbon source and carrier gas was 1:2, and the carbon source was cracked on the surface of the porous cake-like template at 900 °C to generate grap...

Embodiment 3

[0053] The preparation of thousand-layer cake-shaped nanographene includes the following operations:

[0054] The basic magnesium carbonate with a thickness of 20 nm nanosheets was used, immersed in a 0.5 mol / L cellulose aqueous solution for 1 h, filtered, and compacted under a pressure of 25 MPa by a tablet machine.

[0055] The above product is placed in the reactor, and the CO-containing 2 gas (CO 2 The volume fraction is 20%, and the rest is nitrogen) calcined at 950°C for 3h. The easily decomposable components in the above product escape, and the remaining substances form a porous cake-shaped oxide template. Then the gas was switched to argon, and a carbon source (mixture of dichlorobenzene and propylene oxide, mass ratio of 1:1) and carrier gas (mixture of helium and nitrogen, volume ratio of 1:1) were introduced. The carbon source space velocity is 1 g / g / h, the volume ratio of carbon source to carrier gas is 1:0.5, and the carbon source is cracked on the surface of t...

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Abstract

The invention discloses a lasagna nano graphene and a preparation method and application thereof. The graphene has a diameter of 50 to 300 nm and a thickness of 1 / 5 to 1 / 2 of the diameter. Small graphene sheets are vertically supported between slice layers, and the spacing between the slice layers is 0.7 to 1 nm. The preparation method comprises the steps of first, preparing nano slice layered precursor, and then performing high-temperature roasting to generate a porous pie oxide template; and after carbon deposition under a high temperature, removing the oxide template and conducting drying. The preparation method has the characteristics of simple operation, high yield, low cost and easy expansion. The performance advantage lies in that when a large amount of lasagna nano graphenes are stacked, the lasagna nano graphenes are anti-compression and hard to overlap, and the stacked structure is not easy to swell by an electrolyte. The lasagna nano graphene is suitable for use as an electrode material of a super capacitor under high voltage, and has the characteristics of having a high energy density per unit area and being not easy to attenuate.

Description

technical field [0001] The invention belongs to the technical field of graphene, and relates to a thousand-layer cake-shaped nano-graphene and a preparation method and application thereof. Background technique [0002] Supercapacitor is a device that uses the electrochemical capacitive principle to store energy. It has the advantages of high power density and long service life. It can be used as the storage of unstable current (such as wind energy and tidal energy), as well as large vehicles (such as ships). or aircraft) backup lighting power, can also be used as a battery peak adjustment function. However, compared with lithium-ion batteries, the energy density of supercapacitors is relatively low, and their applications in some small, heavyweight vehicles and mobile electronic devices are limited. [0003] Supercapacitors are mainly composed of electrode materials, electrolytes, separators, collective currents, and packaging shells, among which electrode materials are the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/44H01G11/36H01G11/86C01B32/184
CPCY02E60/13H01G11/24C01B2204/04C01B2204/32H01G11/36H01G11/44H01G11/86
Inventor 骞伟中田佳瑞杨周飞
Owner TSINGHUA UNIV
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