Method for preparing active carbon for polar electric pole by using biomass material as raw material

A biomass material, biomass raw material technology, applied in the field of activated carbon manufacturing, can solve the problems of unable to form industrial scale production, unable to stably control the activation process, unable to obtain activation products and other problems, to achieve strong electrical conductivity, inside pores and other problems. Clean, high-performance results

Active Publication Date: 2009-05-06
浙江阿佩克斯能源科技有限公司
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  • Abstract
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  • Claims
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Problems solved by technology

The raw material mixture foams and expands during activation, the activation process cannot be controlled stably, the activation efficiency is also reduced, and the activation product with uniform and stable quality cannot be obtained.
[0005] When using alkali activation to produce activated carbon, there is no corresponding alkali metal treatment (recovery) method to eliminate potential safety hazards, and industrial scale production cannot be formed

Method used

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  • Method for preparing active carbon for polar electric pole by using biomass material as raw material

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preparation example Construction

[0042]② Electrode preparation: According to the ratio of activated carbon (after pulverization and surface treatment): PTFE: conductive additive (carbon black) = 8:1:1, mix with solvent, mix evenly in a mixer, dry, and press tablet Machine or roller compactor to press into 100-150um thin slices, punch out circular electrode sheets with a certain area by punching machine, and do vacuum drying.

[0043] ③Electrolyte: use 1M Et 4 NBF 4 / PC solution.

[0044] ④ Diaphragm: Use cellulose non-woven fabric with a thickness of 40 μm and dry it in vacuum.

[0045] ⑤ Assembly of EDLC cell: In a glove box, an EDLC cell was assembled using a dried stainless steel cell device for lithium ion secondary battery measurement. The specific operation is: open the stainless steel unit, put in a piece of activated carbon electrode, place a diaphragm on it, insert a Teflon ferrule for fixing, add 0.5ml of 1MEt 4 NBF 4 / PC solution, then put 1 piece of activated carbon electrode, place a metal g...

Embodiment 1

[0048] Bamboo chips are used as an example for biomass raw materials. Bamboo chips of 2-10 cm are used to obtain bamboo charcoal after carbonization at 1000 ° C for 2 hours in a retort furnace, and then crushed to an average particle size of 200-300 μm, which becomes the raw material of bamboo-based activated carbon for supercapacitor electrodes. Properties such as specific surface area, total pore volume, micropore volume, specific gravity, and electrical conductivity are summarized in Table 1. It can be seen that the bamboo charcoal has a high specific surface area and good electrical conductivity.

Embodiment 2

[0050] Use the bamboo charcoal of Example 1, mix KOH according to the carbon-to-alkali weight ratio of 1:3, raise the temperature to 550°C while stirring, and keep the temperature at 500-600°C for 2 hours, then raise the temperature to 800°C, and keep the temperature between 700-900°C for 0.5 hours. After cooling, wash with deionized water / acid several times, dry, and grind to an average particle size of 10-15 mm to obtain powdered activated carbon. Properties such as specific surface area, total pore volume, specific gravity, and electrical conductivity are summarized in Table 1. It can be seen that the obtained activated carbon has a large specific surface area, well-developed pores, high conductivity and high specific gravity. The charge and discharge test was carried out as the electrode material of supercapacitor, and the results are shown in Table 1. Bamboo-based activated carbon activated by this method, as an electrode material for EDLC, has high specific capacitance...

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Abstract

The invention provides a preparation method of active carbon which is used for polar electrodes by taking biomass material as raw material. The process is controllable, and has good effect. The method sequentially comprises the steps as follows: 1) the biomass raw material is carbonized; 2) the carbon material which is carbonized in step 1) is crushed and mixed with alkali according to the proportion; subsequently, the primary activation of the mixture is carried out under the condition of mixing at the temperature of 500-600 DEG C; and 3) the carbon material activated in the step 2) is secondarily activated at the temperature of 700-900 DEG C. The method uses the biomass material as the raw material; the carbon gained by high-temperature carbonization has clean holes and strong conductivity of vascular bundle, and is suitable for the carbon raw material of the active carbon used for the electrode, more especially for the electrode of EDLC; subsequently, a mixed-typed two-step alkalization activation method is adopted to activate the carbon raw material, the process is simple to be controlled, and the active carbon with uniform quality and excellent performance can be gained.

Description

technical field [0001] The present invention relates to a method for producing activated carbon. Background technique [0002] In the prior art, there have been many studies on the method of making carbon materials for electrodes such as supercapacitors with alkali activation, such as the following documents: (1) open Document: Functional Materials 2006.37 (4): 675~679, (2) Patent Document: CN101117219, (3) Patent Document: CN101125650, (4) Public Document: Carbon Technology 2003. (5): 1-7, (5) Public literature: Carbon 2002. (1): 11-15. (6) Public Documents: Forest Products Chemistry and Industry 2001.21 (4): 11-15, (7) Public Documents: Carbon Technology 2006.25 (1): 6-9, (8) Public Documents: Forest Products Chemistry and Industry 2005.25 (B10) : 73-76, (9) patent documents: CN1446948 etc. In the prior art, the carbonization temperature is generally below 600°C; when activated with alkali (KOH, NaOH, etc. or a mixture of the two or more), one-stage activation is used, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/08
Inventor 陈再华王正郁
Owner 浙江阿佩克斯能源科技有限公司
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