Preparation method of modified graphite electrode material and application thereof

A graphite electrode and modification technology, applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, etc., can solve the problems of low power density, low mass, and small specific surface area, and achieve high power density and mass specific capacitance. , the effect of large specific surface area

Active Publication Date: 2017-08-04
SUZHOU HAILINGDA EIECTRONIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional carbon materials often have problems such as small specific surface area, low mass specific capacitance, low power density, etc., which requires a series of process operations such as modification to improve its performance as an electrode material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Add 50 g of graphite and 120 mL of sulfuric acid with a mass concentration of 85% into the reaction vessel, keep it in a water bath at 45°C for 15 min, then add 15 g of potassium permanganate, keep it for 10 min, and then raise the temperature rapidly to 70°C, stirred at a rate of 200 rpm for 80 min, and after the reaction was completed, 300 mL of hydrogen peroxide with a mass fraction of 2.5% was added to the container, and the mixture was stirred at a rate of 150 rpm until it changed color. The cake was washed twice with 3% hydrochloric acid solution with a mass concentration, and then washed twice with deionized water. The washed filter cake was placed in a drying oven and dried at 75°C for 8 hours to obtain graphite oxide;

[0024] (2) The graphite oxide obtained in step (1) was mixed with 250 mL of 20% ammonia water, and then the mixture was heated in an oven at 85 °C for 30 min to obtain a viscous slurry, which was then placed in a High-temperature treatment a...

Embodiment 2

[0030] (1) Add 50 g of graphite and 120 mL of sulfuric acid with a mass concentration of 85% into the reaction vessel, keep it in a water bath at 45°C for 20 min, then add 17 g of potassium permanganate, keep it for 10 min, and quickly lower the temperature to Raise to 70°C, stir the reaction at a rate of 200 rpm for 85 min, add 300 mL of hydrogen peroxide with a mass fraction of 2.5% to the container after the reaction is completed, stir the mixture at a rate of 150 rpm until it changes color, filter while hot, and filter the obtained The filter cake was washed twice with 3% hydrochloric acid solution with a mass concentration, and then washed twice with deionized water. The washed filter cake was placed in a drying oven and dried at 75°C for 8 hours to obtain graphite oxide;

[0031](2) The graphite oxide obtained in step (1) was mixed with 250 mL of 20% ammonia water, and then the mixture was heated in an oven at 85 °C for 35 min to obtain a viscous slurry, which was then pl...

Embodiment 3

[0037] (1) 50 g of graphite and 120 mL of sulfuric acid with a mass concentration of 85% were added to the reaction vessel, kept in a water bath at 45°C for 25 min, then 20 g of potassium permanganate was added, and the temperature was quickly lowered after maintaining for 10 min. Rise to 70°C, stir the reaction at a rate of 200 rpm for 90 min, add 300 mL of hydrogen peroxide with a mass fraction of 2.5% to the container after the reaction is completed, stir the mixture at a rate of 150 rpm until it changes color, filter while hot, and filter the obtained The filter cake was washed twice with 3% hydrochloric acid solution with a mass concentration, and then washed twice with deionized water. The washed filter cake was placed in a drying oven and dried at 75°C for 8 hours to obtain graphite oxide;

[0038] (2) The graphite oxide obtained in step (1) was mixed with 250 mL of 20% ammonia water, and then the mixture was heated in an oven at 85 °C for 40 min to obtain a viscous slur...

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Abstract

The invention discloses a preparation method of a modified graphite electrode material and an application thereof. The process comprises the steps of oxidizing graphite to acquire a graphite oxide, then enabling the graphite oxide to be mixed with ammonia water and performing heating processing, subsequently performing high-temperature processing under the protection of nitrogen to acquire an activated product, then performing modification, putting the modified graphite oxide into a reactor, adding a mixed solvent of deionized water and absolute ethyl alcohol, polyvinylpyrrolidone and tetrapropyl orthosilicate, performing high-temperature processing to acquire an intermediate compound, carrying out solidification processing, ball-milling processing and carbonization processing on the intermediate compound, finally adding sodium dodecylbenzene sulfonate, magnet powder, nickel hydroxide, a conductive agent and a binding agent, and preparing an electrode piece through the steps of stirring, coating, drying, rolling and the like. The prepared modified graphite electrode material is large in specific surface area, high in mass specific capacitance and high in power density, and has good application prospects. Meanwhile, the invention further discloses an application of the modified graphite electrode material prepared according to the process in preparation of a supercapacitor.

Description

technical field [0001] The invention relates to the technical field of capacitor materials, in particular to a preparation method and application of modified graphite electrode materials. Background technique [0002] A supercapacitor is an energy storage element between a battery and a traditional capacitor based on the electrochemical process at the electrode / electrolyte interface. It has the characteristics of high power density of ordinary capacitors and high energy density of batteries, and has excellent continuous and rapid charging Discharge performance, long cycle life, high power density, wide operating temperature range, and environmental friendliness. Supercapacitors have broad application prospects in many fields, such as mobile communications, information technology, aerospace, national defense technology, civilian fields or used alone to adjust electric loads, store electricity, or with fuel cells, solar cells, wind power, internal combustion engines and other...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/34H01G11/24H01G11/86
CPCY02E60/13H01G11/34H01G11/24H01G11/86
Inventor 陈绍光
Owner SUZHOU HAILINGDA EIECTRONIC TECH CO LTD
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