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A kind of activated carbon material that can be used for supercapacitor electrode and preparation method thereof

A supercapacitor and activated carbon technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of low specific capacity, unfavorable electric double layer, and high production cost of supercapacitor electrode materials, and achieve low cost and overcome corrosion The effect of strong resistance and high degree of graphitization

Active Publication Date: 2018-10-02
BENAN ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above two are activated by KOH and NaOH composite activators. Although the amount of alkali is reduced and the specific capacity can be effectively increased, the production cost is still high, and the recovery of alkali in the later stage and the sewage treatment in the recovery process will cause serious environmental impacts. big impact
[0006] Both CN101356607B and CN102856081A use phosphoric acid to activate activated carbon and obtain phosphorus compound activated carbon. The prepared product removes ash under high temperature and pressure and retains appropriate phosphorus compound. The content of phosphorus atoms is 1000-3000ppm, but thus The obtained phosphorus compound composite activated carbon is mostly microporous (average pore diameter is 1.7nm-2.1nm) distribution, which is not conducive to the formation of an electric double layer, so as a supercapacitor electrode material, the specific capacity is low

Method used

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  • A kind of activated carbon material that can be used for supercapacitor electrode and preparation method thereof

Examples

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preparation example Construction

[0040] One of preparation technology that the present invention adopts is to preconfigure composite activator solution, in described step (1), alkali and phosphorus compound are dissolved in distilled water after mixing by certain mass ratio, and alkali and phosphorus compound are mixed according to 1:(0.1~ 5) are mixed in a mass ratio, and the amount of distilled water is 0.5 to 10 times the total mass of the alkali and the phosphorus compound.

[0041] The alkali and phosphorus compound for configuring the composite activator solution, the alkali can be NaOH, KOH, etc., and the phosphorus compound can be sodium phosphate, potassium phosphate, sodium hydrogen phosphate, potassium hydrogen phosphate, etc.

[0042] In the step (1), sodium hydroxide and sodium phosphate are mixed and then dissolved in distilled water, stirred evenly and then placed for 0.1 to 10 hours.

[0043] The added amount of the petroleum coke powder is 0.1-1 times of the total mass of the alkali and the p...

Embodiment 1

[0057] Mix 12g of sodium hydroxide and 7.2g of sodium phosphate and dissolve in 30mL of distilled water, stir evenly, cool to room temperature, add 6g of petroleum coke powder and 1.2mL of ethanol (chemically pure) into it, stir evenly and place it for 60min to obtain a mixture . Stir the mixture at 60°C for 1 hour, heat and dry at 150°C in the atmosphere, then place it in an activation furnace, raise the temperature of the furnace to 700°C at a rate of 5°C / min under the protection of nitrogen, and heat-preserve and activate After 1h, it was cooled to room temperature with the furnace, then pickled with hydrochloric acid with a concentration of 5mol / L, then washed with distilled water until neutral, and dried in a vacuum oven at 100°C for 10h to obtain a phosphorus-containing composite activated carbon. Get 0.8g phosphorus-containing composite activated carbon, mix phosphorus-containing composite activated carbon, conductive carbon black, and polytetrafluoroethylene evenly in ...

Embodiment 2

[0059] Mix 8g of sodium hydroxide and 2.4g of sodium phosphate and dissolve in 20mL of distilled water, stir evenly, cool to room temperature to obtain a composite activator solution, add 2g of petroleum coke powder and 0.5mL of ethanol (chemically pure) to it, stir evenly and place 60min, the mixture was obtained. The mixture was stirred for 2 hours at a temperature of 70°C, heated and dried at 150°C in the atmosphere, then placed in an activation furnace, and the temperature of the furnace was raised to 800°C at a rate of 10°C / min under the protection of nitrogen. After heat preservation and activation for 1 h, it was cooled to room temperature with the furnace, followed by pickling, water washing, and drying operations as in Example 1 to obtain phosphorus-containing composite activated carbon. The electrode preparation method, battery assembly, and test conditions are the same as in Example 1. The test data are shown in Table 1.

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Abstract

The invention relates to an active carbon material used for supercapacitor electrodes and a preparation method thereof. The active carbon material is obtained by processing petroleum coke powder with a composite activator containing alkali and a phosphorus compound. The active carbon material is a phosphorus-containing composite active carbon. The content of phosphorus atoms in the active carbon material is 1000ppm-20000ppm.

Description

technical field [0001] The invention relates to an activated carbon material and a preparation method thereof, in particular to an activated carbon material which can be used for supercapacitor electrodes and a preparation method thereof. Background technique [0002] Electric Double Layer Capacitor (EDLC), also known as supercapacitor, is a new type of energy storage element that uses the electric double layer formed between the interface between carbon materials such as activated carbon and the electrolyte to store charges. It has characteristics intermediate between an electric induction capacitor and a secondary battery. [0003] The electricity storage mechanism of an electric double layer capacitor relies on the formation of an electric double layer between the electrode material and the electrolyte to store charges. As an electrode material for a supercapacitor, the performance of activated carbon material mainly depends on the internal pore structure, including pore ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/33C01B32/342
Inventor 刘宇吕仙月贺健
Owner BENAN ENERGY
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