Carbon/graphene composite super-capacitor electrode materials and preparation method thereof

A graphene composite and supercapacitor technology, applied in the field of electrochemical energy storage, to achieve the effect of facilitating transmission, increasing energy density, and increasing area specific capacitance

Inactive Publication Date: 2018-11-27
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, few studies have been conducted to improve the electrochemical performance by optimizing the structure of electrode materials.

Method used

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  • Carbon/graphene composite super-capacitor electrode materials and preparation method thereof
  • Carbon/graphene composite super-capacitor electrode materials and preparation method thereof
  • Carbon/graphene composite super-capacitor electrode materials and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Add 2ml of 28% ammonia water dropwise to 20ml of 20mg / ml graphene oxide solution, stir for 30min, soak 8mm thick fir wood chips in the above solution, vacuumize for 24h, take it out, heat for a while, freeze Dry for 36h. Then carbonize at 700° C. for 60 min under the protection of argon to obtain a carbon / graphene composite material. Soak it in 2M potassium hydroxide solution to test its electrochemical performance.

[0035] figure 1 It is the transmission electron microscope image of the prepared graphene oxide. figure 2 is the cross-section (perpendicular to the direction of tree growth) of the original fir wood chip, image 3 It is a longitudinal section (parallel to the direction of tree growth) of the original fir wood chip, and it can be seen that the original wood has many vertical porous structures. After pouring into the graphene oxide solution, pass Figure 4 (Cross-sectional view of wood impregnated with graphene oxide) and Figure 5 (Longitudinal cros...

Embodiment 2

[0037] Add 5mg of ascorbic acid into 20ml of 15mg / ml graphene oxide solution, stir for 30min, soak 16mm thick basswood chips in the above solution, vacuumize for 48h, take it out, heat for a period of time, and freeze dry for 48h. Then carbonize at 800° C. for 120 min under the protection of argon in a tube furnace to obtain a carbon / graphene composite electrode material. Soak it in 1M sulfuric acid solution to test its electrochemical performance.

Embodiment 3

[0039] Add 4 mg of citric acid to 10 ml of 10 mg / ml graphene oxide solution, stir for 30 min, soak 20 mm thick eucalyptus chips in the above solution, vacuumize for 48 h, take it out, heat for a period of time, and freeze dry for 48 h. Then carbonize at 900° C. for 180 min under the protection of argon in a tube furnace to obtain a carbon / graphene composite electrode material. Soak it in 1M sodium sulfate solution to test its electrochemical performance.

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Abstract

The invention relates to carbon/graphene composite super-capacitor electrode materials and a preparation method thereof. By filling holes of natural wood with graphene oxide and carrying out high-temperature carbonization, the electrode materials are prepared. The electrode materials comprise penetrating big hole structures which are perpendicular to the plane direction of the electrodes and are formed by carbonizing the wood, and small hole structures formed by graphene. The carbon/graphene composite electrode materials can be independently used without adhesives and conductive agent. The thickness is adjustable, application of non-active materials in a super capacitor assembly process is effectively reduced and a super capacitor with high area specific capacitance and long circulation service lifetime is obtained.

Description

technical field [0001] The invention relates to the field of electrochemical energy storage, in particular to a carbon / graphene composite supercapacitor electrode material and a preparation method thereof, in particular to carbon / graphene composite supercapacitor electrode materials prepared by carbonizing graphene oxide into natural wood and its preparation method. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, are a new type of energy storage device whose performance is between physical capacitors and secondary batteries. It has the characteristics of high specific power of physical capacitors and high specific energy of batteries. Due to the characteristics of high power density, long cycle life, instant high current fast charge and discharge, wide operating temperature range, safety, and no pollution, supercapacitors have broad applications in electric vehicles, uninterruptible power supplies, aerospace, military and many other f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/32H01G11/34H01G11/36H01G11/44
CPCH01G11/24H01G11/32H01G11/34H01G11/36H01G11/44Y02E60/13
Inventor 李晓锋戴千韩霜于中振
Owner BEIJING UNIV OF CHEM TECH
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