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Device and method for preparing electrode of vertical graphene double electric layer capacitor at constant voltage

A technology of electric double-layer capacitors and graphene, which is applied in the manufacture of hybrid/electric double-layer capacitors, capacitors, capacitors, etc., can solve problems affecting the growth rate and growth area of ​​graphene, hindering the preparation and application of high-quality nanomaterials, etc. Achieve the effects of increasing the effective energy storage area, low cost, and fast graphene growth rate

Active Publication Date: 2014-09-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low pressure or vacuum required by the above-mentioned plasma vapor enhanced chemical vapor deposition process seriously affects the growth rate and growth area of ​​graphene, hindering the large-scale preparation and application of this high-quality nanomaterial.

Method used

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  • Device and method for preparing electrode of vertical graphene double electric layer capacitor at constant voltage
  • Device and method for preparing electrode of vertical graphene double electric layer capacitor at constant voltage
  • Device and method for preparing electrode of vertical graphene double electric layer capacitor at constant voltage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: Using methane as the carbon source gas to make a vertically oriented graphene electric double layer supercapacitor electrode.

[0039] The current collector is a stainless steel sheet with a thickness of 0.025 mm, the taper of the needle tip of the needle electrode is 1:5, the distance between the needle tip and the current collector is 10 mm, the inert gas is argon, and the carbon source gas is methane.

[0040] A mixed gas of hydrogen and argon is fed into the quartz tube at a flow rate of 2000 ml / min, the ratio of hydrogen and argon is 1:1, and normal pressure is maintained. Heat the current collector to 700°C. Maintain the normal pressure and current collector temperature in the quartz tube, and switch the gas inlet to a mixed gas of methane and argon after 10 minutes. The flow rate of the mixed gas is 1500 ml / min, the ratio of methane and argon is 1:10, the relative humidity of the mixed gas is 40%, and the normal pressure is maintained. Turn on the hi...

Embodiment 2

[0041] Example 2: Using acetylene as the carbon source gas to make vertically oriented graphene electric double layer supercapacitor electrodes.

[0042] The current collector is a copper sheet with a thickness of 0.02 mm, the taper of the needle tip of the needle electrode is 1:20, the distance between the needle tip and the current collector is 5 mm, the inert gas is argon, and the carbon source gas is acetylene.

[0043] A mixed gas of hydrogen and argon is fed into the quartz tube at a flow rate of 2000 ml / min, the ratio of hydrogen and argon is 1:1, and normal pressure is maintained. Heat the current collector to 900°C. Maintain the normal pressure and current collector temperature in the quartz tube, and switch the gas inlet to a mixed gas of acetylene and argon after 10 minutes. The flow rate of the mixed gas is 1500 ml / min, the ratio of acetylene and argon is 1:30, the relative humidity of the mixed gas is 55%, and the pressure is kept at normal pressure. Turn on the...

Embodiment 3

[0044] Example 3: Using methane as the carbon source gas to make a vertically oriented graphene electric double layer supercapacitor electrode.

[0045] The current collector is a nickel sheet with a thickness of 0.05 mm, the taper of the needle tip of the needle electrode is 1:10, the distance between the needle tip and the current collector is 1 mm, the inert gas is helium, and the carbon source gas is methane.

[0046] Pass the mixed gas of hydrogen and helium into the quartz tube, the flow rate is 2000 ml / min, the ratio of hydrogen and helium is 1:1, and the normal pressure is maintained. Heat the current collector to 700°C. Maintain the normal pressure and current collector temperature in the quartz tube, and switch the gas intake to a mixed gas of methane and helium after 10 minutes. The flow rate of the mixed gas is 1500 ml / min, the ratio of methane and helium is 1:5, the relative humidity of the mixed gas is 45%, and the normal pressure is maintained. Turn on the hig...

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Abstract

The invention discloses a device and a method which are used for preparing an electrode of a vertical graphene double electric layer capacitor at the constant voltage. The device comprises a quartz tube, a heating furnace, a flow collector, a needle-like electrode, a high voltage negative power supply, an inert gas inlet, a hydrogen inlet, a bubble bottle and a carbon source gas inlet. The flow collector and the needle-like electrode are placed inside the quartz tube, the needle-like electrode is externally connected with the high voltage negative power supply and the needle tip of the needle-like electrode is opposite to the flow collector. The flow collector is grounded. The quartz tube is placed in the heating furnace. One end of the quartz tube is opened while the other end of the quartz tube is provided with the inert gas inlet, the hydrogen inlet, and the carbon source gas inlet, wherein the carbon source gas inlet is connected with the quartz tube through the bubble bottle. With the adoption of constant voltage glow normal discharge plasma-enhanced chemical vapor deposition method, a vertical-oriented graphene nanopiece grows directly on the surface of the flow collector, so that the electrode of the double electric layer supercapacitor, which uses the vertical-oriented graphene as an active material, is directly obtained without a bonder.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and relates to a device and a method for preparing vertically oriented graphene electric double layer supercapacitor electrodes under normal pressure. Background technique [0002] A supercapacitor is an electrochemical energy storage device between traditional capacitors and secondary batteries, mainly including electric double layer capacitors and Faraday quasi-capacitors (also known as pseudocapacitors). The principle of electric double layer capacitance is the interface electric double layer theory proposed by German physicist Helmholtz in 1853, that is, the electrostatic capacitance is generated through the charge separation process on the interface between the active material and the electrolyte for energy storage. Compared with Faraday quasi-capacitors, electric double-layer capacitors have no chemical reaction on the electrode and electrolyte surface, and have faster char...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86H01G13/00
Inventor 薄拯岑可法严建华王智华池涌
Owner ZHEJIANG UNIV
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