KR101553716B1 - Active carbon for an electric double layer capacitor electrode and process for manufacturing the same - Google Patents
Active carbon for an electric double layer capacitor electrode and process for manufacturing the same Download PDFInfo
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- KR101553716B1 KR101553716B1 KR1020090034603A KR20090034603A KR101553716B1 KR 101553716 B1 KR101553716 B1 KR 101553716B1 KR 1020090034603 A KR1020090034603 A KR 1020090034603A KR 20090034603 A KR20090034603 A KR 20090034603A KR 101553716 B1 KR101553716 B1 KR 101553716B1
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
Provided is a method for producing an activated carbon for an electric double layer capacitor having a small average particle diameter and a uniform particle size and a relatively large specific surface area at an easy and low cost.
Characterized in that the carbon material which can be easily graphitized is subjected to a resurfacing treatment using an alkali metal hydroxide after the calcination treatment and then wet pulverized using two kinds of balls having different diameters. And a BET specific surface area of 1500 to 2500 m < 2 >.
Graphitization, electric double layer capacitor, activated carbon
Description
The present invention relates to activated carbon, which is a carbon material for an electric double layer capacitor electrode, and a method for producing the same.
Activated carbon is a porous structure made by reviving carbon materials such as coconut coke, petroleum coke, and coal coke. Porous activated carbon having a large surface area is widely used for an electrode material such as an adsorbent or a catalyst carrier, an electric double layer capacitor, and a lithium secondary battery. Particularly, in an electric double layer capacitor used in a hybrid car or the like, activated carbon having a high degree of crystallinity and a large surface area in which fine pores are effectively formed as an electrode material thereof in order to increase energy density, i.e., capacitance.
Industrial production of activated carbon in which micropores usable in electrode materials of such electric double layer capacitors are effectively formed is carried out by heating a carbon material such as petroleum coke or the like and an alkali metal compound such as potassium hydroxide in an inert gas atmosphere or the like in the range of 600 to 1200 DEG C , And an activating method in which an alkali metal is interposed between graphite crystal layers and reacted is generally used. In such a resurrection, alkali metal penetrates into the layered structure in which the layered condensed polycyclic carbon compound is laminated, and fine pores are formed.
The activated carbon obtained by the alkali activation treatment has a relatively large specific surface area. Further, when the electrode for an electric double layer capacitor is produced, it is required that the average particle size of the activated carbon is small and the particle size of the activated carbon is matched.
In
Patent Document 1: Japanese Patent Application Laid-Open No. 2000-182904
Patent Document 2: JP-A 2006-324183
Patent Document 3: JP-A-2008-7387
As a method for reducing the particle size of the activated carbon, there are a method of pulverizing the activated carbon to the target particle size and a method of recovering activated carbon by reacting the minute material of the raw material. However, the former causes the pores to be broken by the pulverization, In the latter case, since the particles are fusion-bonded at the time of resurfacing, there is a problem that the particle diameter of the obtained activated carbon becomes larger than the diameter of the raw material. The inventors of the present invention have found that activated carbon having a large specific surface area and small particle diameter can be easily obtained by wet pulverizing activated carbon after alkaline activation and further combining a ball of a ball mill with a large diameter and a small diameter.
That is, the present invention relates to a process for producing a graphitized carbon material, which is characterized in that a carbon material which can be easily graphitized is subjected to a calcination treatment, followed by an activation treatment using an alkali metal hydroxide, and then wet pulverized using two kinds of balls having different diameters A particle diameter of 0.5 to 5 mu m, and a BET specific surface area of 1500 to 2500 m < 2 > / g.
The present invention also relates to a method for producing activated carbon for an electric double layer capacitor electrode characterized in that the average particle diameter of the graphitizable carbon material is 0.5 to 8 탆.
Further, the present invention is characterized in that the diameters of two balls having different diameters are 1 to 30 mm, and the diameters of small balls are 1/10 to 1/2 of diameters of large balls. And more particularly,
The present invention also relates to activated carbon for an electric double layer capacitor electrode obtained by the above production method.
The present invention also relates to an electric double layer capacitor using the activated carbon for the electric double layer capacitor electrode.
According to the present invention, an activated carbon for an electric double layer capacitor having a small average particle diameter and a uniform particle size and a relatively large specific surface area can be easily manufactured at a lower cost. Further, by using the activated carbon obtained according to the present invention for an electrode, activated carbon having a large capacitance per unit volume is provided.
Hereinafter, the present invention will be described in detail.
Examples of readily graphitizable carbonaceous materials used as starting materials in the present invention include carbonized petroleum coke or coal coke and the like which are insolubilized and carbonized at an intermediate phase pitch or mesophase pitch spinning fibers thereof Petroleum coke is preferred in the present invention, and petroleum raw coke is particularly preferred.
Petroleum raw coke which is preferably used as a starting material in the present invention is an aggregate obtained by laminating a polycyclic aromatic compound having an alkyl side chain and is a solid which is not heat-solubilized.
Petroleum coke is a solid carbon-based product obtained by pyrolyzing (caulking) heavy oil fractions at a high temperature of about 500 ° C, and is called petroleum coke in correspondence with ordinary coal coke. Petroleum coke is produced by the delayed caulking method and the flow caulking method, and most of the petroleum coke is made up of electrons. In the present invention, it is preferable to use petroleum coke (raw coke) as it is from the coker as the petroleum coke. The raw coke produced by the delayed caulking method generally has a volatile content of 6 to 13 mass%, and the raw coke produced by the flow caulking method has a volatile content of usually 4 to 7 mass%. In the present invention, any kind of raw coke may be used, but raw coke produced by a delayed caulking method which is easily available and has a stable quality is particularly preferable.
The heavy oil fraction of the petroleum is not particularly limited. However, the heavy oil fraction of the petroleum is not particularly limited, but examples thereof include heavy oil obtained as residual oil when distilling petroleum, distillate oil obtained by fluid catalytic cracking of petroleum, heavy oil obtained by hydrodesulfurizing petroleum, .
In the present invention, after calcination of the graphitizable carbon material, an alkali metal hydroxide is used to effect the resurfacing process in the activation process.
At this time, the average particle diameter of the graphitizable carbon material before the activation process is adjusted to 0.5 to 8 탆, preferably 1 to 6 탆. If the particle size of the carbon material is more than 8 mu m, it is preferable that the target activated carbon particles have a particle diameter of more than 10 mu m. It is not preferable because it is larger than the particle diameter.
The method for adjusting the particle diameter of the carbon material is not particularly limited, but is usually pulverized by a crushing means such as a jet mill. The pulverization is usually carried out after the firing treatment described below, but may be carried out before the firing treatment.
The firing conditions of the graphitizable carbon material are a firing temperature of 500 to 700 ° C, preferably 520 to 680 ° C, and a firing time of 10 minutes to 2 hours as a holding time after reaching the target temperature.
The reaction conditions for the resuming treatment in the resuspension process are not particularly limited as long as the reaction can proceed sufficiently, and the resuspension reaction can proceed under the same reaction conditions as the known resuscitation treatment performed in the production of ordinary activated carbon. For example, in the resurrection step, the reaction is carried out by mixing the alkali metal hydroxide, which is carried out during the production of ordinary activated carbon, with the calcined carbide, preferably at 400 ° C or higher, more preferably at 600 ° C or higher, Lt; 0 > C or higher. The upper limit of the heating temperature is not particularly limited as long as it is a temperature at which the recovery reaction proceeds without interruption, but is preferably 900 ° C or lower.
Examples of the alkali metal hydroxide used in the resurrection reaction in the resuspension process include KOH, NaOH, RbOH, and CsOH. Of these, KOH is preferable from the viewpoint of the resurrection effect.
The alkali activation method is usually carried out by mixing an activator such as an alkali metal hydroxide and a carbide and heating them. Although the mixing ratio of the carbide and the activator is not particularly limited, the mass ratio of both carbides (activator) is preferably in the range of 1: 0.5 to 1: 5, more preferably in the range of 1: 1 to 1: 3 Do.
In the present invention, a method of obtaining an activated carbon by putting the thus-obtained activated product into an alkaline slurry by usually putting it into water, wet-pulverizing the alkaline slurry, and then carrying out cleaning is preferably employed. However, And then wet-pulverized from a water slurry.
The slurry concentration is preferably in the range of 2 to 40%, more preferably in the range of 5 to 20%. When the slurry concentration is less than 2%, the pulverization efficiency is deteriorated, which is not preferable. When the slurry concentration exceeds 40%, the flowability is deteriorated and the impact force by the balls is lowered.
The apparatus used for the wet pulverization is not particularly limited as long as the object of the present invention can be achieved, and examples thereof include a ball mill, an attritor, a sand mill, a bead mill and the like, but a ball mill is preferably used.
Hereinafter, an example of wet milling by a ball mill will be described.
Examples of balls include alumina balls, zirconia balls, stainless steel balls, silicon nitride balls, and tungsten carbide balls.
In the present invention, it is necessary to use at least two kinds of balls having different ball diameters in order to alleviate the impact at the time of pulverization. In this case, the combination of the balls is important so that the fused particles are mainly broken and the pulverization of the particles is relatively small.
The diameter of the large balls is preferably 1 to 30 mm, more preferably 5 to 20 mm, and the diameter of the small balls is preferably in the range of 1/10 to 1/2 of the ball diameter of the large balls.
The ratio of the total weight of the large balls to the total weight of the small balls is preferably in the range of 1/10 to 10/1, more preferably in the range of 2/8 to 8/2.
The pulverization time is preferably 30 minutes to 5 hours, more preferably 60 minutes to 3 hours since the activated carbon having the desired particle diameter and surface area can not be obtained even if the pulverization time is too long or too short. The number of revolutions is preferably 10 to 100 rpm, more preferably 30 to 60 rpm.
As a cleaning method of the recovered product, a method of washing the recovered product with a cleaning liquid and performing solid-liquid separation is preferably adopted. For example, a method of immersing the recovered liquid in a cleaning liquid, stirring and heating the liquid as necessary to mix the cleaning liquid with the cleaning liquid, and then removing the cleaning liquid.
As the cleaning liquid, it is preferable to use water and / or an aqueous acid solution. For example, cleaning with water, cleaning with an aqueous acid solution, and washing with water may be appropriately combined.
Examples of the acid aqueous solution include hydrochloric acid, hydroiodic acid such as hydroiodic acid and hydrobromic acid, and inorganic acid such as sulfuric acid and carbonic acid. The concentration of the acid aqueous solution is, for example, 0.01 to 3N. The cleaning with these cleaning liquids can be repeatedly carried out several times as required.
The amount of the alkali metal remaining in the carbide is not particularly limited as long as it is lower than the level at which the adverse effect is likely to be caused by the electric double layer capacitor (preferably 1,000 mass ppm or less). Usually, To about 8, and, if possible, cleaning so as to remove the alkali metal component. After the washing, the objective activated carbon can be obtained through a drying process which is usually carried out.
The activated carbon obtained by the present invention has an average particle diameter of 0.5 to 5 탆 and a specific surface area of 1,500 to 2,500
Next, the electric double layer capacitor of the present invention will be described.
The electric double layer capacitor of the present invention is characterized by comprising an electrode containing the activated carbon prepared as described above.
The electrode may be an electrode formed by adding, for example, activated carbon and a binder, more preferably a conductive agent, and further integrated with the current collector.
As the binder to be used herein, known ones can be used, and examples thereof include polyolefins such as polyethylene and polypropylene, fluorinated polymers such as polytetrafluoroethylene, polyvinylidene fluoride, and fluoroolefin / vinyl ether copolymer crosslinked polymers , Cellulose such as carboxymethyl cellulose, vinyl-based polymers such as polyvinyl pyrrolidone and polyvinyl alcohol, and polyacrylic acid. The content of the binder in the electrode is not particularly limited, but is appropriately selected within the range of usually about 0.1 to 30 mass% with respect to the total amount of the activated carbon and the binder.
As the conductive agent, powders of carbon black, powder graphite, titanium oxide, ruthenium oxide and the like are used. The amount of the conductive agent to be added to the electrode is appropriately selected according to the purpose of the compounding, but is appropriately selected within a range of usually 1 to 50 mass%, preferably 2 to 30 mass%, based on the total amount of the activated carbon, the binder and the conductive agent.
As a method of mixing activated carbon, a binder and a conductive agent, a well-known method is suitably applied. For example, a solvent having a property of dissolving a binder is added to the above-mentioned components to prepare a slurry, Or a method of kneading the above components without adding a solvent, followed by pressure molding at room temperature or under heating.
As the collector, a known material and shape can be used. For example, a metal such as aluminum, titanium, tantalum, nickel, or an alloy such as stainless steel can be used.
The unit cell of the electric double layer capacitor of the present invention is generally obtained by using a pair of the electrode as a positive electrode and a negative electrode and immersing the electrode in an electrolytic solution while opposing the separator (polypropylene fiber nonwoven fabric, glass fiber nonwoven fabric, synthetic cellulose paper, etc.) .
As the electrolytic solution, a known aqueous electrolytic solution or an organic electrolytic solution can be used, but it is more preferable to use an organic electrolytic solution. Examples of such organic electrolytic solutions include electrolytes used as electrochemical electrolytic solutions. Examples of the organic electrolytic solutions include propylene carbonate, ethylene carbonate, butylene carbonate,? -Butyrolactone, sulfolane, sulfolane derivatives, , 1,2-dimethoxyethane, acetonitrile, glutaronitrile, valeronitrile, dimethylformamide, dimethyl sulfoxide, tetrahydrofuran, dimethoxyethane, methyl formate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate And the like. These electrolytes may be mixed and used.
The supporting electrolyte in the organic electrolytic solution is not particularly limited, but various kinds of salts such as salts, acids, alkalis and the like commonly used in the electrochemical field or the battery field can be used. For example, inorganic ion salts such as alkali metal salts and alkaline earth metal salts (C 2 H 5 ) 4 NBF 4 , (C 2 H 5 ) 3 (CH 3 ) NBF 4 , (C 2 H 5 ) 4 PBF 4 , (C 2 H 5 ) 3 (CH 3 ) PBF 4 and the like are preferable. The concentration of these salts in the electrolytic solution is appropriately selected within the range of usually about 0.1 to 5 mol / l, preferably about 0.5 to 3 mol / l.
A more specific configuration of the electric double layer capacitor is not particularly limited. For example, a coin-like type which is housed in a metal case through a separator between a pair of electrodes (positive electrode and negative electrode) A winding type in which electrodes are wound through a separator, and a lamination type in which a plurality of electrode groups are laminated via a separator.
Example
Hereinafter, the present invention will be described in detail by way of examples, but the present invention is not limited to these examples.
In addition, hydrogen / carbon atom ratio, volatile content, true density, specific surface area, particle size distribution measurement and electrostatic capacity were obtained by the following methods.
(1) hydrogen / carbon atom ratio
Carbon mass% and hydrogen mass% in the sample were determined using an organic element analyzer (SUMIGRAPH HCN-22F, a coin analysis center product), and the hydrogen / carbon atom ratio was calculated.
(2) Volatile matter
Was measured in accordance with the method described in JIS M8812 "Petroleum and Coke Industrial Analysis Method ".
(3) True density
Measured according to JIS K 2151.
(4) Specific surface area
Was measured by a nitrogen gas adsorption method (BET method).
(5) Measurement of particle size distribution
A small amount of surfactant was added to the dispersion medium using a laser diffraction particle size distribution analyzer (LA-950, manufactured by Gyaken Kogyo Co., Ltd.), and ultrasonic irradiation was performed. 10% particle diameter (D10), 50% particle diameter (average particle diameter (D50)) and 90% particle diameter (D90) were obtained from the particle size integration curve based on the obtained volume.
(6) Capacitance
The coin-shaped cell was charged to 2.7 V at a constant current of 2 mA per 1F. After the charge was completed, the battery was maintained at 2.7 V for 30 minutes, and then a constant current discharge of 1 mA was performed at 20 캜. In the discharge curve, when the time taken for the voltage to fall from 80% to 80% of the charging voltage to V1, 40% to V2, and 80% to 40% is ΔT and the discharging current value is I, The electrostatic capacity [F / g] per mass is calculated by calculating the electrostatic capacity C [F] and dividing it by the mass of the activated carbon contained in the electrode (the sum of the positive electrode and the negative electrode). This F / g was multiplied by the electrode density [g / cc] to calculate F / cc.
Capacitance C [F] = I DELTA T / (V1 - V2)
[Example 1]
Petroleum raw coke was used as raw material. The physical properties thereof are shown in Table 1.
The raw coke was baked in a nitrogen gas atmosphere at 550 DEG C for 1 hour. At that time, the temperature raising rate was set at 200 ° C / hour. The physical properties of the carbide after firing are shown in Table 1. The particle size distribution when this carbide is pulverized by a jet mill is shown in Fig. The average particle diameter (D50) of the pulverized product was 2.5 mu m. Subsequently, to 100 parts by mass of this pulverized product, 220 parts by weight of potassium hydroxide was mixed, and an activation reaction was carried out at 700 DEG C for 1 hour in a nitrogen gas atmosphere. After the reaction, the reaction product was poured into water to obtain an alkali slurry.
An alumina ball (5 kg having a diameter of 17 mm and 5 kg having a diameter of 5 mm) was put into a ball mill port having an inner diameter of 234 mm and a height of 234 mm in an amount of 500 g (solid content / water = 1/20 weight ratio) And pulverized. The pulverized material was washed with water and washed with acid (using hydrochloric acid) repeatedly to remove remaining potassium, and dried to obtain activated carbon. The particle size distribution of the obtained activated carbon is shown in Fig. The activated carbon had an average particle diameter of 3.9 mu m and a specific surface area of 2220 m2 / g. The results are shown in Table 2.
10 parts by mass of carbon black and 10 parts by mass of polytetrafluoroethylene powder were added to 80 parts by mass of the activated carbon, and the mixture was kneaded in a mortar until it became a paste. Subsequently, the obtained paste was rolled by a roller press of 180 kPa to prepare an electrode sheet having a thickness of 200 m.
Two discs each having a diameter of 16 mm were punched out from the electrode sheet and vacuum-dried at 120 DEG C and 13.3 Pa (0.1 Torr) for 2 hours. Then, in an organic electrolytic solution (triethylmethylammonium Propylene carbonate solution of tetrafluoroborate, concentration: 1 mol / liter) was vacuum-impregnated. Then, a collector of aluminum foil was attached to both electrodes with a cellulosic separator (trade name: TF40-50, thickness: 50 mu m, product of Nihon Koji Kogyo Co., Ltd.) And assembled into a bipolar cell manufactured by Ochin Corp. to produce an electric double layer capacitor (coin type cell). The capacitance was measured for each of the obtained capacitors. The results are shown in Table 3.
[Example 2]
The raw coke used in Example 1 was fired at 650 ° C for 1 hour. The rate of temperature rise or atmospheric gas was the same as in Example 1. The physical properties of the carbide after firing are shown in Table 1.
This carbide was pulverized by a jet mill. The particle size distribution of the pulverized product is shown in Fig. The average particle diameter (D50) was 0.9 mu m. This pulverized product was subjected to a resurrection treatment in the same manner as in Example 1 to obtain an alkaline slurry.
500 g (solid content / water = 1/10 weight ratio) of this slurry was pulverized in a ball mill at a rotation speed of 60 rpm for 3 hours in the same manner as in Example 1. The pulverized material was washed with water and washed with acid (using hydrochloric acid) repeatedly to remove remaining potassium and dried to obtain activated carbon. The particle size distribution of the obtained activated carbon is shown in Fig. The activated carbon had an average particle diameter of 1.0 mu m and a specific surface area of 1680 m2 / g. The results are shown in Table 2.
Next, using this activated carbon, an electric double layer capacitor was produced in the same manner as in Example 1, and the electrostatic capacity was measured. The results are shown in Table 3.
[Example 3]
The raw coke fired material used in Example 1 was pulverized by a jet mill. The particle size distribution of the pulverized product is shown in Fig. The average particle diameter (D50) was 4.7 mu m. This pulverized product was revived in the same manner as in Example 1, and an alkali slurry was obtained.
500 g (solid content / water = 1/20 weight ratio) of this slurry was pulverized for 4 hours at a rotation speed of 60 rpm using a ball mill in the same manner as in Example 1. [ The pulverized material was washed with water and washed with acid (using hydrochloric acid) to remove remaining potassium and dried to obtain activated carbon. The particle size distribution of the obtained activated carbon is shown in Fig. The activated carbon had an average particle diameter of 4.0 占 퐉 and a specific surface area of 2120 m2 / g. The results are shown in Table 2.
Subsequently, the activated carbon was used to prepare an electric double layer capacitor in the same manner as in Example 1, and the electrostatic capacity was measured. The results are shown in Table 3.
[Example 4]
The jet mill pulverized raw material coke used in Example 1 was subjected to a resuscitation in the same manner as in Example 1 to obtain an alkaline slurry.
This slurry was repeatedly washed with water and acid (using hydrochloric acid) to remove remaining potassium, and a cleaning slurry was obtained. 500 g (solid content / water = 1/20 weight ratio) of this slurry was pulverized for 1 hour at a rotation speed of 60 rpm using a ball mill in the same manner as in Example 1. [ The obtained activated carbon had an average particle diameter of 3.6 mu m and a specific surface area of 2260 m2 / g. The results are shown in Table 2.
Subsequently, the activated carbon was used to fabricate an electric double layer capacitor in the same manner as in Example 1, and the electrostatic capacity was measured. The results are shown in Table 3.
[Comparative Example 1]
The jet mill pulverized raw material coke used in Example 1 was subjected to a resuscitation in the same manner as in Example 1 to obtain an alkaline slurry.
This slurry was repeatedly washed with water and acid-washed (using hydrochloric acid) to remove remaining potassium, and dried to obtain activated carbon. The particle size distribution of the obtained activated carbon is shown in Fig. The activated carbon had an average particle diameter of 15.1 mu m and a specific surface area of 2320 m2 / g. The results are shown in Table 2.
Subsequently, the activated carbon was used to fabricate an electric double layer capacitor in the same manner as in Example 1, and the electrostatic capacity was measured. The results are shown in Table 3.
[Comparative Example 2]
20 g of the activated carbon obtained and dried in Comparative Example 1 was charged into a ball mill pot and alumina balls used in Example 1 and pulverized for 3 hours at a rotation speed of 60 rpm. The obtained activated carbon had an average particle diameter of 3.8 mu m and a specific surface area of 1460 m2 / g. The results are shown in Table 2.
Subsequently, the activated carbon was used to fabricate an electric double layer capacitor in the same manner as in Example 1, and the electrostatic capacity was measured. The results are shown in Table 3.
[Comparative Example 3]
500 g of the cleaning slurry obtained in the same manner as in Example 4 was wet pulverized in the same manner as in Example 4 except that 10 kg of alumina balls having a diameter of 17 mm were used. The obtained activated carbon had an average particle diameter of 6.7 mu m and a specific surface area of 2190 m2 / g. The results are shown in Table 2.
Subsequently, the activated carbon was used to fabricate an electric double layer capacitor in the same manner as in Example 1, and the electrostatic capacity was measured. The results are shown in Table 3.
[Comparative Example 4]
500 g of the cleaning slurry obtained in the same manner as in Example 4 was wet pulverized in the same manner as above except that 10 kg of alumina balls having a diameter of 5 mm were used. The obtained activated carbon had an average particle diameter of 7.4 占 퐉 and a specific surface area of 2040 m2 / g. The results are shown in Table 2.
Subsequently, the activated carbon was used to prepare an electric double layer capacitor in the same manner as in Example 1, and the electrostatic capacity was measured. The results are shown in Table 3.
℃
hr
-
mass%
g / cm3
Fig. 1 shows the particle size distribution curves of the activated carbon and the carbide before the activation in Example 1. Fig.
Fig. 2 shows the particle size distribution curves of the activated carbon and the carbide before the resurfacing of Example 2. Fig.
Fig. 3 shows the particle size distribution curves of the activated carbon and the carbide before the activation in Example 3. Fig.
Fig. 4 shows the particle size distribution curves of the activated carbon and the carbide before the resurfacing of Comparative Example 1. Fig.
Claims (6)
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| KR20180119955A (en) | 2017-04-26 | 2018-11-05 | 한국과학기술연구원 | Powered activated carbon for removing taste and odor in water and Method for fabricating the same and Method for removal of manganese ions using the same and Coagulation method using the same |
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| KR101381710B1 (en) * | 2012-05-09 | 2014-04-04 | 파워카본테크놀로지 (주) | Method for manufacturing active carbon for electrode using cokes and method for manufacturing active carbon composition for electrode |
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| KR20210066054A (en) | 2019-11-27 | 2021-06-07 | 파워카본테크놀로지 (주) | Activated carbon for electric double layer capacitor by co2-alkali complex activation process and method for manufacturing the same |
| KR20220063537A (en) | 2020-11-10 | 2022-05-17 | 파워카본테크놀로지 (주) | ACTIVATED CARBON FOR ELECTRIC DOUBLE LAYER CAPACITOR BY NaOH-CO2 COMPLEX ACTIVATION PROCESS AND METHOD FOR MANUFACTURING THE SAME |
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| JP2004149363A (en) * | 2002-10-31 | 2004-05-27 | Honda Motor Co Ltd | Method of manufacturing active carbon |
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| KR20180119955A (en) | 2017-04-26 | 2018-11-05 | 한국과학기술연구원 | Powered activated carbon for removing taste and odor in water and Method for fabricating the same and Method for removal of manganese ions using the same and Coagulation method using the same |
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