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Current collector subjected to surface modification by vertically-oriented graphene and preparation method thereof

A graphene surface and vertical orientation technology, applied in the field of electrochemical energy storage, can solve the problem of low energy storage efficiency, achieve the effect of improving rate performance, low cost, and reducing contact resistance

Inactive Publication Date: 2013-12-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of low energy storage efficiency due to the large contact resistance between the pure sheet-type current collector or the three-dimensional foam current collector and the active material in the prior art, the present invention provides a vertically oriented graphene that greatly reduces the contact resistance Surface Modified Current Collector

Method used

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  • Current collector subjected to surface modification by vertically-oriented graphene and preparation method thereof
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  • Current collector subjected to surface modification by vertically-oriented graphene and preparation method thereof

Examples

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Effect test

Embodiment 1

[0035] Example 1: Nickel foam current collector with vertically oriented graphene surface modification.

[0036] A pair of needle-plate electrodes are arranged in the quartz tube, the needle electrodes are connected to DC negative high voltage, and the plate electrodes are grounded. The quartz tube is placed in a temperature-controlled heating furnace, with one end ventilated and the other end open. Put the nickel foam current collector on the flat plate electrode, let hydrogen gas into the ventilation end, and turn on the heating furnace to heat the nickel foam current collector to 700°C. After 10 minutes, the hydrogen gas was turned off and a mixed gas composed of methane, argon and water vapor was introduced, wherein the proportion of methane was 10wt%, and the relative humidity of the mixed gas was 40%. Turn on the DC negative high voltage to 10000V to form glow discharge plasma between the needle plate electrodes. After 3 minutes of discharge, turn off the DC negative h...

Embodiment 2

[0037] Example 2: Nickel sheet current collector with vertically oriented graphene surface modification.

[0038]A pair of needle-plate electrodes are arranged in the quartz tube, the needle electrodes are connected to DC negative high voltage, and the plate electrodes are grounded. The quartz tube is placed in a temperature-controlled heating furnace, with one end ventilated and the other end open. Put the nickel sheet current collector on the flat plate electrode, flow hydrogen into the ventilation end, and turn on the heating furnace to heat the nickel foam current collector to 1000°C. After 10 minutes, the hydrogen gas was turned off and a mixed gas composed of methane, argon and methane was introduced, wherein the proportion of methane was 5 wt%, and the relative humidity of the mixed gas was 60%. Turn on the DC negative high voltage to 9000V to form glow discharge plasma between the needle plate electrodes. After 30 minutes of discharge, turn off the DC negative high v...

Embodiment 3

[0039] Example 3: Copper sheet current collector with vertically oriented graphene surface modification.

[0040] A pair of needle-plate electrodes are arranged in the quartz tube, the needle electrodes are connected to DC negative high voltage, and the plate electrodes are grounded. The quartz tube is placed in a temperature-controlled heating furnace, with one end ventilated and the other end open. Put the copper sheet current collector on the flat electrode, flow hydrogen gas into the ventilation end, and turn on the heating furnace to heat the nickel foam current collector to 800°C. After 10 minutes, turn off the hydrogen and feed a mixed gas composed of acetylene, helium and water vapor, wherein the proportion of acetylene is 20wt%, and the relative humidity of the mixed gas is 30%. Turn on the DC negative high voltage to 12000V to form glow discharge plasma between the needle plate electrodes. After 10 minutes of discharge, turn off the DC negative high voltage, turn o...

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Abstract

The invention discloses a current collector subjected to surface modification by vertically-oriented graphene. The surface of the current collector is modified by a vertically-oriented graphene nanosheet layer. The invention also discloses a method for preparing the current collector. The method comprises the following steps: by taking mixed gas consisting of carbon source gas, amorphous carbon etching gas and argon as a precursor and adopting a plasma enhanced chemical vapor deposition method, obtaining the current collector subjected to the surface modification by the vertically-oriented graphene under the condition that an adhesive is not needed. The surface of the obtained current collector is modified by a network structure layer consisting of vertically-oriented graphene nanosheets, an exposed dense graphene edge is provided, the full contact between the current collector and an active material is promoted, the internal resistance is reduced, and the high-rate and high-power density energy storage can be realized when the current collector is applied to energy storage devices such as a super-capacitor and a secondary battery.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, and in particular relates to a current collector with a vertically oriented graphene surface modification and a preparation method thereof. Background technique [0002] In electrochemical energy storage devices such as supercapacitors and secondary batteries, one of the main functions of current collectors is to concentrate and conduct the charges stored in energy storage active materials. However, due to the processing process and the microscopically rough surface of the material itself, there are only limited contact points between the traditional sheet-type current collector and the active material, which will form a shrinking diffusion resistance at the interface of the two. Larger contact resistance will hinder the charge transmission and collection, thereby affecting the energy storage rate performance and seriously reducing the power density of the energy storage device. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/84H01G11/66H01M4/70B82Y30/00B82Y40/00
CPCY02E60/10Y02E60/13
Inventor 薄拯岑可法严建华王智化池涌
Owner ZHEJIANG UNIV
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