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Preparation method of activated carbon for supercapacitors

A technology for supercapacitors and activated carbon, which is applied in the field of preparation of activated carbon for supercapacitors. It can solve the problems of low specific surface area and capacitance of activated carbon, affecting the service life of supercapacitors, and uneven distribution of carbon material pores, so as to increase capacity and high rate. Excellent charge and discharge performance, excellent capacitance characteristics, and short pre-activation time

Inactive Publication Date: 2016-09-21
江苏易电通智慧能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the specific surface area and capacitance of the activated carbon prepared by the above method are low, and the pore distribution of the carbon material is uneven, which will affect the service life of the supercapacitor, and its performance needs to be further improved.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0025] The application provides a method for preparing activated carbon for supercapacitors, comprising the following steps: pulverizing pre-configured biomass materials; treating the pulverized biomass materials with alkali, and then obtaining a precursor by filtering to remove the Impurities in the biomass material after alkali treatment; the precursor is immersed in potassium hydroxide solution for ultrasonic vibration and stirring, and then filtered to obtain a modified precursor; the modified precursor is heated to make The modified precursor is pre-activated; alkali hydroxide is added to the modified precursor and activated by heating. Preferably, the biomass material includes starch, lignin, corn cobs, rice husks, wheat ears, trees, coconut shells, fruit shells, leaves or straws.

[0026] Further, in one embodiment, the concentration of the potassium hydroxide solution used to impregnate the precursor is 0.01-5 mol / L.

[0027] Further, in one embodiment, the average pa...

Embodiment 1

[0041] Weigh 10 g of corn stalks and put them into a pulverizer to pulverize, with an average particle size of 1 mm. The crushed corn stalk powder was placed in 300ml of 0.1mol / L potassium hydroxide solution and stirred for 20min. Filter and wash to obtain pure biomass. Put the pure biomass in a beaker of 500ml potassium hydroxide solution with a concentration of 1mol / L, ultrasonically disperse it for 25min, the ultrasonic frequency is 50KHz, the stirring speed is 400r / min, the stirring time is 25min, filter and wash to obtain the alkali-modified biomass. Put 5g of alkali-modified activated carbon in a tube furnace, set heating parameters, heating stage 1, heating rate 3°C / min, to 150°C, keep warm for 30min, and cool to obtain pre-activated activated carbon. Mix preactivated activated carbon with potassium hydroxide crystals at a mass ratio of 100:7, place in a muffle furnace, heat up to 800°C, and hold for 2 hours. Get activated charcoal.

[0042] Electrochemical tests we...

Embodiment 2

[0044]Take by weighing 10g coconut shell, put into pulverizer and pulverize, average particle size 1mm. The crushed corn stalk powder was placed in 300 ml of 0.1 mol / L potassium hydroxide solution and stirred for 20 min. Filter and wash to obtain pure biomass. Put the pure biomass in a 500ml beaker with a concentration of 1mol / L potassium hydroxide solution, ultrasonically disperse for 25min, the ultrasonic frequency is 50KHz, the stirring rate is 400r / min, the stirring time is 25min, and the alkali-modified biomass is obtained by filtration and washing. Put 5 g of alkali-modified activated carbon in a tube furnace, set heating parameters, heating stage 1, heating rate 3 °C / min, to 150 °C, keep warm for 30 min, and cool to obtain pre-activated activated carbon. Mix preactivated activated carbon with potassium hydroxide crystals at a mass ratio of 100:7, place in a muffle furnace, heat up to 800°C, and hold for 2 hours. Get activated charcoal.

[0045] Electrochemical tests ...

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Abstract

The invention discloses a preparation method of activated carbon for supercapacitors. The method comprises the steps of: crushing a pre-configured biomass material; subjecting the crushed biomass material to alkali treatment, then performing filtration to remove impurities from the alkali treated biomass material so as to obtain a precursor; then immersing the precursor in a potassium hydroxide solution to conduct supersonic vibration and stirring, and then performing filtering to obtain a modified precursor; heating the modified precursor, and pre-activating the modified precursor; adding a hydroxide of alkali into the modified precursor and conducting heating activation. The preparation method has a simple process, solves the problem of uneven pore distribution of carbon materials, and improves the structural consistency of carbon materials. The prepared carbon material has abundant pores, high specific surface area, and excellent capacitance characteristics, significantly improves the supercapacitor capacity and high-rate charge-discharge capacity, has good circulation performance, prolongs the supercapacitor life, and has very good economical efficiency and adaptability.

Description

technical field [0001] The invention relates to the field of preparation of electrode materials, in particular to a method for preparing activated carbon for supercapacitors. Background technique [0002] The supercapacitor developed in recent years not only has the high specific power and circulation of traditional physical capacitors, but also has the high specific energy characteristics of chemical power sources. Therefore, it can not only meet the conditions of use requiring high specific power, but also meet the requirements High specific energy use conditions. Due to the excellent pulse charge and discharge performance of supercapacitors and the large-capacity energy storage performance that traditional physical capacitors do not have, the application of supercapacitors in high-energy pulsed lasers has attracted widespread attention. At the same time, because of its large storage energy, light weight, and unlimited charge and discharge, it is used as a backup power so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12
CPCC01P2006/12C01P2006/40
Inventor 章小康瞿志华
Owner 江苏易电通智慧能源有限公司
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