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Developed-mesopore active carbon for super capacitor electrode and preparation method thereof

A supercapacitor and activated carbon technology, applied in hybrid capacitor electrodes, hybrid/electric double layer capacitor manufacturing, chemical instruments and methods, etc., can solve problems such as contribution without further research, and achieve high mesopore occupancy rate and pore structure Reasonable and wide range of raw material sources

Inactive Publication Date: 2016-03-02
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing activated carbons for supercapacitance are too much concerned with the pore volume, and there is no further research on the contribution of the proportion of mesopores and micropores to the capacitance.

Method used

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  • Developed-mesopore active carbon for super capacitor electrode and preparation method thereof
  • Developed-mesopore active carbon for super capacitor electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Mechanically pulverize the needle coke with a toothed pulverizer, pass through the 14-mesh and 20-mesh screens continuously, take the intermediate materials of the 14-mesh and 20-mesh screens, and place them in a vacuum furnace for carbonization. The vacuum furnace is first evacuated to 10Pa, then the temperature is raised to 350°C at 5°C / min, the temperature is kept constant for 1h, and the temperature is naturally lowered at the end of the heat preservation.

[0038] 2. Take the carbonized material in step 1 and put it in the activation furnace, replace the air in the furnace with nitrogen for 10 minutes, the nitrogen flow rate is 10ml / min, then the activation furnace is heated up to 750°C at 5°C / min, and activated with water vapor, the water vapor The flow rate is 10ml / min, and the activation time is 3h. The temperature of the activation furnace is naturally lowered, and the output material is pulverized by a fluidized bed jet mill, with a median particle size of ...

Embodiment 2

[0043] The difference from Example 1 is that this example chooses coal tar pitch coke as the raw material. Keep the temperature at 350°C for 3 hours in a vacuum furnace, and cool down naturally after the heat preservation. Subsequent activation and powder treatment process are the same as in Example 1.

[0044] The low-temperature nitrogen adsorption test shows that the specific surface area of ​​the activated carbon is 2050m 2 / g, the proportion of mesopores with a pore diameter of 2 to 3 nm is 24%. The supercapacitor activated carbon electrode material has a specific capacitance of 116F / g at a discharge current density of 50mA / g.

Embodiment 3

[0046] 1. Mechanically pulverize the mesophase pitch with a press mill pulverizer, pass through 20-mesh and 30-mesh screens continuously, take the intermediate material of 20-mesh and 30-mesh screens, and place them in a vacuum furnace for carbonization. The vacuum furnace is first evacuated to 10 -1 Pa, then raise the temperature to 550°C at 5°C / min, keep the temperature constant for 3h, and cool down naturally at the end of the heat preservation.

[0047] 2. Take the carbonized material in step 1 and put it in the activation furnace, and replace the air in the furnace with nitrogen for 10 minutes, the nitrogen flow rate is 10ml / min, then the activation furnace is heated up to 850°C at 5°C / min, activated with water vapor, and the water vapor The flow rate is 10ml / min, and the activation time is 5h. The temperature of the activation furnace is naturally lowered, and the output material is pulverized by a fluidized bed jet mill, with a median particle size of D50=13 μm, and th...

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Abstract

The invention discloses a developed-mesopore active carbon for a super capacitor electrode and a preparation method thereof. In the activated carbon, the particle median particle size D50 is 4-15 [mu]m, the specific surface area is 1500-2500 m<2> / g, and the pore channel occupancy rate of the particle mesopore diameter of 2-3 nm is 20%-30%. The preparation process comprises the steps: selecting any one of petroleum pitch, coal pitch, mesophase pitch, petroleum coke, coal pitch coke, needle-shaped coke and anthracite as a raw material, placing in a vacuum furnace, carbonizing, firstly carrying out water vapor activation on the carbonized material, carrying out powder processing, then carrying out secondary activation by using an oxidizing atmosphere, and adjusting to obtain mesopores with appropriate proportion; and grading and carrying out magnetic removal process treatment on the secondary activated material to obtain the developed-mesopore active carbon. A prepared super capacitor has the advantages of high specific capacitance, long cycle life and stable product performance.

Description

technical field [0001] The invention relates to the technical field of supercapacitor electrodes, in particular to activated carbon with well-developed mesopores for supercapacitor electrodes and a preparation method thereof. Background technique [0002] Supercapacitor is a new type of energy storage medium between batteries and traditional capacitors. It has the advantages of higher specific power than batteries, higher specific energy than traditional capacitors, low self-discharge, long cycle life, wide temperature range and high safety performance. Supercapacitors are widely used in different application fields such as auxiliary peak power, backup power supply, stored regenerative energy, alternative power supply, etc., and have very broad development prospects in the fields of industrial control, wind power generation, transportation, smart three-meter, electric tools, military industry, etc. . [0003] According to the storage and conversion mechanism of electric en...

Claims

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Application Information

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IPC IPC(8): C01B31/10H01G11/26H01G11/86C01B32/336
CPCY02E60/13
Inventor 沈龙王霞吴玉虎李虹丁晓阳
Owner SHANGHAI SHANSHAN TECH CO LTD
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