KR101751607B1 - Method for manufacturing material used in electrode of capacitor, material used in electrode manufactured by the same and capacitor comprising the same - Google Patents
Method for manufacturing material used in electrode of capacitor, material used in electrode manufactured by the same and capacitor comprising the same Download PDFInfo
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- KR101751607B1 KR101751607B1 KR1020150148228A KR20150148228A KR101751607B1 KR 101751607 B1 KR101751607 B1 KR 101751607B1 KR 1020150148228 A KR1020150148228 A KR 1020150148228A KR 20150148228 A KR20150148228 A KR 20150148228A KR 101751607 B1 KR101751607 B1 KR 101751607B1
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- activated carbon
- capacitor
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- acid
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- 239000003990 capacitor Substances 0.000 title claims abstract description 53
- 239000000463 material Substances 0.000 title claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 139
- 239000002253 acid Substances 0.000 claims abstract description 24
- 239000007772 electrode material Substances 0.000 claims abstract description 24
- 238000002407 reforming Methods 0.000 claims abstract description 24
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims description 14
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims description 9
- 239000008103 glucose Substances 0.000 claims description 9
- 238000002425 crystallisation Methods 0.000 claims description 4
- 230000008025 crystallization Effects 0.000 claims description 4
- 239000006258 conductive agent Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 2
- 238000011156 evaluation Methods 0.000 description 13
- 229910009361 YP-50F Inorganic materials 0.000 description 11
- 238000010306 acid treatment Methods 0.000 description 11
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 8
- 239000000203 mixture Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- -1 tetraethylammonium tetrafluorborate Chemical compound 0.000 description 7
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 6
- 239000012153 distilled water Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000003763 carbonization Methods 0.000 description 5
- 239000008151 electrolyte solution Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 238000001069 Raman spectroscopy Methods 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 4
- 239000012298 atmosphere Substances 0.000 description 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 3
- 150000002016 disaccharides Chemical class 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 150000002772 monosaccharides Chemical class 0.000 description 3
- 229910017604 nitric acid Inorganic materials 0.000 description 3
- 239000011368 organic material Substances 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000004627 transmission electron microscopy Methods 0.000 description 3
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 2
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 239000007767 bonding agent Substances 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 229910015015 LiAsF 6 Inorganic materials 0.000 description 1
- 229910013063 LiBF 4 Inorganic materials 0.000 description 1
- 229910013684 LiClO 4 Inorganic materials 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- MYWGVEGHKGKUMM-UHFFFAOYSA-N carbonic acid;ethene Chemical compound C=C.C=C.OC(O)=O MYWGVEGHKGKUMM-UHFFFAOYSA-N 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 1
- 239000011363 dried mixture Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- MHCFAGZWMAWTNR-UHFFFAOYSA-M lithium perchlorate Chemical compound [Li+].[O-]Cl(=O)(=O)=O MHCFAGZWMAWTNR-UHFFFAOYSA-M 0.000 description 1
- 229910001486 lithium perchlorate Inorganic materials 0.000 description 1
- 229910001496 lithium tetrafluoroborate Inorganic materials 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
- H01G11/86—Processes for the manufacture of hybrid or EDL capacitors, or components thereof specially adapted for electrodes
-
- C01B31/08—
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/32—Carbon-based
- H01G11/34—Carbon-based characterised by carbonisation or activation of carbon
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Carbon And Carbon Compounds (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
A method of manufacturing an electrode material for a capacitor, comprising the steps of: acid treating activated carbon; Mixing the acid-treated activated carbon with a reforming material; And heat treating the acid-treated activated carbon and the reforming material at the same time. The present invention has the effect of improving the discharge capacity and the output characteristic of the capacitor by modifying the activated carbon for the capacitor and the carbonizable material and then applying the modified activated carbon heat-treated at a low temperature to the capacitor. Further, since the amount of the conventional conductive agent can be reduced in manufacturing the electrode for a capacitor, the manufacturing cost can be reduced.
Description
The present invention relates to a method of manufacturing an electrode material for a capacitor, and an electrode material and a capacitor including the electrode material. More particularly, the present invention relates to a method of manufacturing an electrode material for a capacitor, The present invention relates to a method of manufacturing an electrode material for a capacitor, and an electrode material and a capacitor including the electrode material.
In the modern society, the energy storage field has developed remarkably as the electric and electronic fields have grown to a high level. Particularly, development of a secondary battery capable of converting electric energy into chemical energy and storing it and converting it into electric energy when necessary is actively developed. However, currently developed secondary batteries do not satisfy high output characteristics or rapid charge / discharge characteristics have. Therefore, recently, electrochemical capacitors have been attracting attention as energy storage devices having these characteristics. Electrochemical capacitors are typically electric double-layer capacitors (EDLC).
Electric double layer capacitors consist of anode and cathode electrodes, separator, electrolytic solution and a case to protect them from external environment. Of these, the positive electrode and the negative electrode are mostly manufactured by the following method. Activated carbon having a specific surface area of about 800 to 3,000 m 2 / g as an electrode material, a conductive agent for increasing electrical conductivity and reducing resistance, and a bonding agent for bonding them to the current collector are mixed to form a slurry, It is fabricated by coating on the same current collector.
In order to realize rapid charging / discharging characteristics in seconds, which is characteristic of electric double layer capacitors, electrode resistance must be small. Therefore, a certain amount of the conductive agent must be added when the electrode is manufactured. However, when the amount of the conductive agent is increased, the capacity per unit volume of the electrode is decreased.
In addition, electric double layer capacitors have the disadvantage that their energy density is lower than those of other energy storage devices. Therefore, research for improving the energy density while enabling rapid charge and discharge is needed. Korean Patent Laid-Open No. 10-2006-0085630 discloses a technique in which carbon is applied to an electrode. However, a technology capable of rapidly charging and discharging at a sufficient level and improving the energy density has not yet been disclosed.
Accordingly, it is an object of the present invention to provide an electrode material for a capacitor, which can be used for an electrode of a capacitor to improve a discharge capacity and an output characteristic, and to reduce the amount of a conductive material, and a method for manufacturing the same.
A method of manufacturing an electrode material for a capacitor, comprising the steps of: acid treating activated carbon; Mixing the acid-treated activated carbon with a reforming material; And heat treating the acid-treated activated carbon and the reforming material at the same time.
In one embodiment of the present invention, the modifying material contains carbon and is carbonized at a temperature of 350 degrees Celsius.
In one embodiment of the present invention, the modifying material is one of glucose, monosaccharide or disaccharide, citric acid, or pitch material.
In one embodiment of the present invention, the heat treatment is performed at a temperature of 350 to 800 degrees Celsius for 0.5 to 5 hours, and the weight ratio of the activated carbon to the reforming material is 1: 0.05 to 1:10.
The present invention also provides an electrode material for a capacitor produced by the above-described method.
The present invention also provides a capacitor including the above-described electrode material for a capacitor.
The present invention has the effect of improving the discharge capacity and the output characteristic of the capacitor by modifying the activated carbon for the capacitor and the carbonizable material and then applying the modified activated carbon heat-treated at a low temperature to the capacitor. Further, since the amount of the conventional conductive agent can be reduced in manufacturing the electrode for a capacitor, the manufacturing cost can be reduced.
FIG. 1 is a step diagram of a method for manufacturing activated carbon which is an electrode material for a capacitor according to an embodiment of the present invention.
Fig. 2 shows the results of measurement by Raman spectroscopy to observe the carbon crystallinity of the activated carbon (YP-50F) and the samples obtained in Examples 1, 2 and 3. Fig.
3 shows the result of transmission electron microscopy (TEM) measurement.
4 is a graph of discharge at the time of discharge at 1 mA in
5 is a graph of discharge at discharge at 1 mA in evaluation 6. FIG.
Hereinafter, preferred embodiments and experimental results of the present invention will be described in detail. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.
In order to solve the above-mentioned problems, the present invention has significantly improved the electrode characteristics by modifying activated carbon to another carbonizable material.
FIG. 1 is a step diagram of a method for manufacturing activated carbon which is an electrode material for a capacitor according to an embodiment of the present invention.
Referring to FIG. 1, activated carbon includes acid treatment of activated carbon, mixing of acid treated activated carbon with a reforming material, drying, and heat treatment. In the present invention, the reforming material is a carbon-containing material which is carbonized at a temperature in the range of 350 to 800 ° C. The reforming material may be glucose, monosaccharide or disaccharide, citric acid, Based material, but the scope of the present invention is not limited thereto. That is, the scope of the present invention includes all the organic materials capable of being carbonized within the above temperature range.
The acid treatment described in Fig. 1 is for removing impurities in activated carbon, and is performed not only to remove impurities but also to smoothly mix the acid treated activated carbon with the reforming material.
In one embodiment of the present invention, the activated carbon used in the acid treatment is usually an electrode material for a capacitor having a specific surface area of 800 to 3,000 m 2 / g. The acid which can be used in the acid treatment is not particularly limited, but hydrochloric acid, nitric acid, Or a mixture thereof. The pH is preferably between 1 and 5.
The acid treatment method is not particularly limited. However, in the acid treatment method, the activated carbon may be immersed directly in the acid treatment solution or mixed with the activated carbon and the acid treatment solution or stirred, or the acid solution may be injected into the closed space, Is subjected to gasification and exposed to activated carbon to be treated.
The acid treated activated carbon according to the above method can be dried or washed and dried. The reason why the acid-treated activated carbon is washed can be performed in order to smooth the subsequent process, and may be omitted. Washing can be carried out by stirring the acid-treated activated carbon with distilled water or organic material several times, or immersing it directly in distilled water or organic matter and allowing the activated carbon to stand.
After treating the activated carbon with an acid, the acid-treated activated carbon and the reforming material are mixed. The weight ratio of the acid-treated activated carbon to the reforming material is preferably 1: 0.05 to 1:10. If it is added in a proportion of less than 0.05, the characteristics of the present invention may not be realized properly, and when it is added in a ratio of 10 or more, it is difficult to mix the activated carbon with the reforming material, It may be difficult to manufacture the electrode when manufacturing the electrode of the capacitor.
As described above, the reforming material according to the present invention is a material which carbonizes at a temperature of 350 ° C or more, and may be any of glucose, monosaccharide, disaccharide, citric acid, It can be one.
The mixing method of the acid-treated activated carbon and the reforming material is not particularly limited, but it is preferable to add the activated carbon after dissolving the modifying substance in the solvent and acid treatment, or to add the activated carbon to the activated carbon in a mortar or a ball mill or an acid The same mechanical mixing method may be used, or the surface of the acid-treated activated carbon may be mixed with the surface of the activated carbon by depositing the modifying material on the surface of the activated carbon by using a device such as CVD (Chemical Vapor Deposition). At this time, the mixed atmosphere can proceed in the atmosphere, can proceed in a nitrogen gas or argon gas atmosphere, and can also proceed in a vacuum state. Further, after the acid-treated activated carbon and the reforming material are mixed, a drying process may be added.
After the acid-treated activated carbon and the reforming material are mixed, a heat treatment process is performed to finally obtain the material proposed by the present invention. Particularly, in the present invention, the acid treatment of the activated carbon and the carbonizable reforming material are thoroughly mixed and the heat treatment is performed at the same time, whereby sufficient electrode characteristics can be obtained.
The heat treatment temperature is suitably between 350 ° C and 800 ° C. When the heat treatment is performed at a temperature lower than 350 ° C, the mixture may not be carbonized properly. When the heat treatment is performed at a temperature higher than 800 ° C, It may not be implemented properly.
Further, the heat treatment time is suitably between 0.5 and 5 hours, the carbonization during carbonization may not be performed well in less than 0.5 hour, the yield after carbonization at carbonization at a temperature of 5 hours or more may be lowered, The characteristics presented may not be implemented properly.
The heat treatment is preferably performed in an atmosphere of nitrogen gas or argon gas. The heat treatment may be performed while flowing nitrogen gas or argon gas, or the inside of the heat treatment furnace may be vacuum-treated and then heat-treated after being filled with nitrogen gas or argon gas.
After the heat treatment, the materials proposed by the present invention can be obtained, and the resultant materials can be collected as they are or used after grinding.
In addition, various types of capacitors containing an electrode containing an activated carbon prepared according to the present invention can be produced, all of which are within the scope of the present invention. That is, according to a general method of manufacturing a capacitor, electrodes and an electrolyte film formed by applying an electrode material to a current collector and pressing them are sequentially laminated and then rolled up to have a structure for pressing them, or sequentially laminated to form a cell The capacitor can be fabricated to have the structure of FIG.
Specifically, the capacitor electrode may be formed by mixing the electrode material, the conductive agent, and the binder described above. The capacitor electrode may be formed in the form of a slurry and applied to a current collector, or may be formed into a sheet, It can be bonded to the current collector by using a bonding agent.
The aqueous electrolytic solution used in the capacitor may be a solution prepared by diluting one or more of hydrochloric acid, sulfuric acid, nitric acid, and acetic acid with distilled water. Alternatively, a solution obtained by selecting one or more kinds of Li 2 SO 4 , Na 2 SO 4 , K 2 SO 4 , (NH 4 ) 2 SO 4 , LiOH, NaOH, KOH and NH 4 OH and mixing them with distilled water It can also be used.
The organic solvent used in the capacitor is formed by mixing an organic solvent and a salt. Specifically, the organic solvent is selected from the group consisting of acetonitrile (AN), ethylene carbonate (EC), propylene carbonate (PC), diethylene carbonate (DEC) It can be selected one kinds or two kinds or more from the group consisting of dimethyl carbonate (DMC), salts TEABF 4 (tetraethylammonium tetrafluorborate), TEMABF 4 (triethylmethylammonium tetrafluorborate), LiClO 4 (lithium perchlorate), LiPF 6 (lithium hexafluorophosphate), LiAsF 6 lithium hexafluoroarsenate, and lithium tetrafluoroborate (LiBF 4 ). It is also possible to use the electrolytic solution by impregnating or coating the separation membrane.
Hereinafter, the present invention will be described with reference to Examples. However, the scope of the present invention is not limited by the embodiments described below.
[Example]
≪ Example 1 >
The following method was used to modify activated carbon.
Activated carbon Acid treatment
First, 10 g of activated carbon (YP-50F) was added to 200 ml of a nitric acid solution of pH 4, and the mixture was stirred for 2 hours. After stirring, the activated carbon was filtered, and the activated carbon was washed several times with distilled water until the pH reached 7.
Acid-treated Activated carbon For reforming Substance mixture
10 g of activated carbon and 1 g of glucose were added to 200 ml of distilled water, and the mixture was stirred for 5 hours.
After stirring, the mixture was dried in an oven at 80 ° C to remove moisture first, and then dried in a vacuum oven at 120 ° C for 12 hours to remove moisture.
Heat treatment
The dried mixture was heat-treated at 400 DEG C for 1 hour in a nitrogen atmosphere to obtain a modified activated carbon for a capacitor.
<Example 2>
A sample was prepared in the same manner as in Example 1, except that 3 g of glucose was added.
<Example 3>
A sample was prepared in the same manner as in Example 1, except that 5 g of glucose was added.
<
The specific surface area of the activated carbon (YP-50F) and the samples obtained in Examples 1, 2 and 3 were measured by gas adsorption / desorption, and the results are shown in Table 1.
Table 1. Specific surface area of YP-50F, Example 1, Example 2, and Example 3
<Evaluation 2>
In order to measure the powder resistance of the activated carbon (YP-50F) and the samples obtained in Examples 1, 2 and 3, 4-prove method was used and the results are shown in Table 2.
Table 2. Powder resistance of YP-50F, Example 1, Example 2, and Example 3
As shown in Tables 1 and 2, as the content of glucose increases, the specific surface area decreases, but the density increases and the powder resistance decreases.
<Evaluation 3.>
In order to observe the carbon crystallinity of the activated carbon (YP-50F) and the samples obtained in Examples 1, 2 and 3, it was measured by Raman spectroscopy and the results are shown in FIG. The ratio of the intensity of the D peak (about 1350 cm -1) and the G peak (about 1580 cm -1) observed through Raman spectroscopy is shown in Table 3.
Table 3. D / G ratios calculated through Raman spectroscopy
A high value of D / G means that the degree of crystallization of the carbon surface is low, while a low value means a high degree of crystallization of the carbon surface. As shown in Table 3, it was observed that the D / G value decreased as the amount of glucose added increased. This means that the degree of crystallization increases through the carbonization of organic materials containing carbon.
<Evaluation 4>
A transmission electron microscope (TEM) was used to observe the particle surfaces of the activated carbon (YP-50F) and the sample obtained in Example 2, and the results are shown in FIG.
In general, the activated carbon is subjected to an activation treatment to widen the specific surface area of the particles, and a large amount of vacant space is present on the surface of the activated carbon and inside the particles after the activation treatment. Therefore, when the activated carbon is observed through the TEM due to the particle surface or the void space in the particle, bright portions of the particles are observed irregularly (red circle). However, in the case of Example 2, this phenomenon was hardly observed. Further, no phenomenon that the particle surface changed or the shape was changed was observed.
<
An electric double layer capacitor was prepared to measure the discharge capacities of activated carbon (YP-50F) and Examples 1, 2, and 3.
To fabricate an electric double layer capacitor, the electrode was fabricated as follows.
A sheet-type electrode was prepared by mixing 85 wt.% Of activated carbon (YP-50F), 10 wt.% Of Super P, a conductive agent, and 5 wt.% Of PTFE (Polytetrafluoroethylene) . At this time, the thickness of the electrode was 200 mu m.
The electrode for the sheet type was vacuum dried in a 60 degree vacuum oven for 12 hours to remove moisture in the electrode.
The electric double layer capacitors were fabricated in coin cell type (2032 type). At this time, the electrode was cut to 12φ in diameter. EMIBF4 was used as the electrolytic solution, and a pulp system was used as the separation membrane.
The fabricated electric double layer capacitors were charged to 3.3V at currents of 1, 2, 5, 7, 10, and 20 mA, respectively, and then charged at 3.3V for 30 minutes. Current was discharged to 0.01 V, and the results are shown in Table 4. Fig. It is a discharge graph at discharge at 1 mA in
Table 4. Discharge Capacity (F / cc) by Current Density Calculated from
<Evaluation 6>
The following electric double layer capacitors were fabricated in order to observe the characteristics of the conductive material when the electrode of the electric double layer capacitor was fabricated.
The electric double layer capacitor was manufactured by a method similar to
A sheet type electrode was prepared by mixing activated carbon (YP-50F) with 95 wt.% Of the samples obtained in Examples 1, 2 and 3 and 5 wt.% Of PTFE (Polytetrafluoroethylene) as an adhesive. At this time, the thickness of the electrode was 200 mu m.
The electrode for the sheet type was vacuum dried in a 60 degree vacuum oven for 12 hours to remove moisture in the electrode.
The electric double layer capacitors were fabricated in coin cell type (2032 type). At this time, the electrode was cut to 12φ in diameter. EMIBF4 was used as the electrolytic solution, and a pulp system was used as the separation membrane.
The fabricated electric double layer capacitors were charged to 3.3V at currents of 1, 2, 5, 7, 10, and 20 mA, respectively, and then charged at 3.3V for 30 minutes. The current was discharged to 0.01 V, the results are shown in Table 5, and FIG. 5 is a discharge graph at discharge at 1 mA in evaluation 6. FIG.
Table 5. Discharge Capacity (F / cc) by Current Density Calculated by Evaluation 6
With reference to the above results, the capacitor including the electrode material according to the present invention has excellent discharge capacity and output characteristics while the shape of the activated carbon is not changed by the carbonizing reforming material.
It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.
The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.
Claims (7)
Acid treating the activated carbon;
Mixing the acid-treated activated carbon with a reforming material; And
And simultaneously heat-treating the mixed activated carbon and the reforming material,
The reforming material may be a glucose-based material,
Wherein the heat treatment is performed at a temperature of 350 to 800 degrees Celsius for 0.5 to 5 hours to carbonize the reforming material, thereby increasing the degree of crystallization of the electrode material.
Wherein the weight ratio of the activated carbon to the reforming material is 1: 0.05 to 1:10.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150148228A KR101751607B1 (en) | 2015-10-23 | 2015-10-23 | Method for manufacturing material used in electrode of capacitor, material used in electrode manufactured by the same and capacitor comprising the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101350445B1 (en) * | 2006-12-26 | 2014-01-15 | 재단법인 포항산업과학연구원 | A method of post-heat treatment of carbon material and a carbon material for electrode of capacitor prepared by the same |
| KR101408206B1 (en) * | 2013-01-08 | 2014-06-16 | 충북대학교 산학협력단 | Modify method of surface of activated carbon for electric double layer capacitor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101350445B1 (en) * | 2006-12-26 | 2014-01-15 | 재단법인 포항산업과학연구원 | A method of post-heat treatment of carbon material and a carbon material for electrode of capacitor prepared by the same |
| KR101408206B1 (en) * | 2013-01-08 | 2014-06-16 | 충북대학교 산학협력단 | Modify method of surface of activated carbon for electric double layer capacitor |
Non-Patent Citations (1)
| Title |
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| V.J.M. Remero et al.,‘Development of functionalized carbon spheres from glucose and sucrose for the adsorption of cationic moieties in aqueous solutions,’Sustainable Environment Research,24(5),339~347* |
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