TWI278881B - Method for preparing electrode material and an electrode of a capacitor using the same - Google Patents

Abstract

The present invention discloses a method for preparing a composite electrode material and an electrode of a capacitor. The method for preparing the composite electrode material comprises steps of preparing a mixture solution including ruthenium halide and carbon, titrating the mixture solution by an alkaline solution to form a precipitate, separating and drying the precipitate, and performing a thermal treating process to activate the precipitate so as to complete the composite material. The weight ratio between ruthenium halide and carbon is between 1:2 and 1:0.125, and the alkaline solution is NaOH or KOH. Particularly, the step of titrating the mixture solution by an alkaline solution includes processes of performing a first titration, placing the mixture solution still for a predetermined period, and performing a second titration, wherein the first titration is terminated substantially at pH 6.8 and the second titration is terminated at pH 7.0.

Description

1278881 IX. Description of the Invention: [Technical Field] The present invention relates to an electrode material and a capacitor electrode preparation method thereof, and more particularly to an electrode material having a high specific capacitance value and a method of preparing the same. [Prior Art] There are two main types of materials for supercapacitors: ruthenium oxide (Ru〇2) and carbon powder. The ruthenium oxide electrode material alone uses a redox reaction of a metal oxide block to generate electric current to achieve storage of electric energy, although its storage performance is superior but expensive. If the particle size of cerium oxide can be further increased to the nanometer scale, the surface area can be increased to increase the utilization efficiency of the bulk material. In addition, the use of carbon powder as an electrode material is instantaneously changed by the arrangement of its electric double layer to store electric charge, and has the advantages of high surface area and constant charge and discharge of this force and low price. If used with mesocarbon, it can also avoid the problem that the general toner is degraded due to uneven pore size or increased resistance. U.S. Patent No. 5,079,674 discloses a supercapacitor electrode and a method for preparing the same, which comprises adding a high surface area carbon powder to an aqueous solution of metal ruthenium to infiltrate a surface of a carbon powder into a pore of a metal ruthenium solution, and then adding sodium hydroxide (NaOH) or hydrogen. Potassium oxide (KOH) is used to form a metal oxide, and after removing water, polytetrafluoroethylene (PTFE) is added to form an electrode material by rolling. No. 5,600,535 discloses a method for preparing an amorphous thin film electrode material by dissolving vaporized ruthenium (RuC13) in an alcohol and heating to boiling and continuously mixing, and cooling to room temperature to form alkoxide. Solution. 106l79.doc 1278881 Dip coating the solution with titanium plate for about 5 to 15 times, heating for 15 minutes, clock, and then immersing in boiling water to dry with TC (TC dry, can obtain a high specific capacitance value of 430F / g (50mV) /s) and a good adhesion. US Pat. After the activated carbon is added to the organic solution to form a gel precipitate and heat-treated at a temperature of 200 to 300 eC in a dark atmosphere to form an electrode material, particles having a size of less than 1 μm can be obtained. US Patent No. 5,797,971 discloses a composite electrode. The preparation method of the material can be used to prepare an electrode composite electrode material with high specific capacitance, high conductivity and high porosity, high energy density at high charge and discharge current, excellent reversibility and cycle life. US Pat. No. 5,851,506 discloses an electrode material and a preparation method thereof for preparing a cerium oxide electrode material from an aqueous metal and an aqueous metal oxide. The capacitance is as high as 747 F/g, and the energy density is as high as 92 J/g. U.S. Patent No. 5,875,092 discloses a cerium oxide electrode material for impurity substitution, which implants hydrogen atoms in the electrode material process to form a transition metal oxide electrode material, which has a high Advantages of energy density, low electrical resistance, and wide operating temperature range. US Patent No. 6,025,020 discloses a method for preparing high-capacity yttrium oxide, which is a cerium oxide electrode material synthesized in a water vapor-rich atmosphere to avoid complicated sol. - gel (sol_gel) process. [Summary of the invention]

106179.doc 1278881 The main object of the present invention is to provide an electrode material having a high specific capacitance value and a method for preparing the capacitor electrode thereof, which can improve the durability of the electrode material and the advantages of the specific capacitance characteristics. In order to achieve the above object, a first embodiment of the present invention discloses a method for preparing an electrode material by using a chemical titration technique, which comprises mixing a powder into a mixed solution by using a tooth and a powder; and titrating the mixed solution with an alkaline solution to form a a precipitate; separating and drying the precipitate and performing a heat treatment process to activate the precipitate to form the electrode material. The weight ratio of the functionalized bismuth to the carbon powder is between 1 · G.9 and 1: G.1, and the test solution may be sodium hydroxide or argon oxygen (four). In particular, titrating the mixed solution with the _detective solution comprises performing a first titration procedure, allowing the mixed solution to stand for a predetermined time, and performing a second titration procedure, wherein the end of the first titration procedure is an acid-base The (pH) value is 6.8 and the end point of the second titration procedure is 1?11 value 7 〇. The electrode material preparation method of the second embodiment of the present invention comprises: arranging a first mixed solution by using cerium and inorganic materials; performing a first solid-liquid separation process, separating a first precipitate from the first mixed solution; Disposing a second mixed solution by using an alkaline solution and the first precipitate; performing a first solid-liquid separation process, separating a second precipitate from the second mixed solution; sintering the second precipitate and removing The inorganic material of the second precipitate forms the cerium oxide. Preferably, the inorganic material is a cerium oxide powder in a hexagonal or vertical packing or other possible deposition manner, and the inorganic material from which the second precipitate is removed utilizes an etching solution in which the etching solution contains hydrofluoric acid. The method for preparing the capacitor electrode of the present invention comprises: using the electrode material 106179.doc 1278881 (the yttrium oxide can also be used) and a binder to prepare a gel; coating the gel on a metal substrate; heating by infrared rays The metal substrate coated with the gel is dried and the gel on the metal substrate is pressed by a roller. Preferably, the metal substrate may be immersed in a heated acidic solution (for example, citric acid, sulfuric acid or nitric acid solution) before coating, the heating temperature may be 50 to 100 eC, and the solution concentration may be 30 wt% to 80 wt ° / Oh, these conditions can be determined by the thickness of the electrode material to be coated). Further, the binder may be selected from the group consisting of polyvinylidene fluoride, polytetrafluoroethylene, and polyethylene fermentation, and the metal substrate may be composed of titanium metal. [Embodiment] FIG. 1 is a flow chart showing the preparation of a capacitor electrode according to a first embodiment of the present invention. The preparation method of the present invention firstly disperses the carbon powder, and then mixes a mixed solution with lanthanum halide (RuX3) and dried carbon powder, wherein the antimony telluride may be lanthanum trifluoride (R11F3) or ruthenium disulfide (RuCl3). Lanthanum tribromide (RuBr3 or) or lanthanum triiodide (R11I3)' and the weight of the toothed bismuth and carbon powder is preferably between 1 ·· 2 to 1 ·· 0.125. Thereafter, the mixed solution is titrated with an alkaline solution at a titration rate of 5 to 4 sec/cm 3 (s/cc) to form a smear composed of carbon and cerium oxide, wherein the test solution may be hydrogen Oxidation of sodium or hydroxide to remove aqueous solution. Preferably, titrating the mixed solution with an assay solution comprises performing a first titration procedure, quenching the mixed solution, and performing a second titration procedure wherein the endpoint of the Dijon-Drip procedure is approximately positive 6.8 and the end of the second drip program is approximately pH 7. Q. Since the acid titration reaction takes time to make the reaction more complete, the present invention utilizes a stage titration to ensure acid 106179.doc •10·1278881. The titration reaction can be completely W. The predetermined time for standing the mixed solution depends on the volume (4), the concentration (M), and the titration rate, as shown in the table, wherein the predetermined time is at least 10 minutes.

• After the titration procedure is completed, stirring is continued for about 12 hours, and then a plurality of cleaning procedures are performed with deionized water to remove impurities, wherein the impurities are mostly sodium halide (N a X) and are strong electrolytes. Removal of impurity metal ions can reduce electrochemical interference during electrical testing. Thereafter, the sediment was separated by a high speed centrifuge, and the precipitate was vacuum dried to form a cerium oxide. Next, the electrode material is formed by heat-treating the precipitate for 1 to 4 hours in an oxygen atmosphere to form the electrode material. After the electrode material is completed, the electrode material is prepared into a one by using a binder and an organic solvent. Glue and apply the gel to a titanium metal substrate. The titanium metal substrate is preferably immersed in a cerium concentration acidic solution heated at a suitable temperature for a period of time (for example, acid, sulfuric acid or nitric acid) In the solution, the heating temperature may be 50 to 100 ° C, and the solution concentration may be 3 〇 wt% to 80 wt%), so that the surface roughness is favorable for the coating of the gel. Thereafter, the gel is dried by infrared heating. a titanium metal substrate, and using a roller to press the gel on the titanium metal substrate. Then, cutting the finished product of appropriate size, and connecting the wire to complete the capacitor electrode ^ preferably, the bonding agent 106179. Doc •11- fn 1278881 is selected from polyvinylidene fluoride, polytetrafluoroethylene and polyvinyl alcohol. Table 2 shows capacitor electrodes prepared at different titration rates. The specific electrode voltage of the capacitor is measured at different scanning rates. The initial value of the reaction was started with Na〇H titration of RuCU aqueous solution, which was tested at different titration rates from 20s/cc, 60s/cc and 240s/cc, respectively. The endpoint detection was controlled by pH. The titration rate of 20s/cc can reach a higher specific capacitance value. If the titration rate is too fast and the reaction proceeds, the reaction should not be carried out or the product is not uniform. If the titration rate is too slow, the specific capacitance value is poor. It should be caused by the production of other derivative compounds. Table 2 ^ Titration rate voltage sweep speed 20 s / cc 60 s / cc 240 s / cc 2 mV / s 436 F / g 362 F / g 350 F / g Table 3 In order to prepare the capacitor electrode with different degree of cleaning, the variation of the capacitance characteristics thereof is as shown in Table 3. The cleaning solution shown in Table 3 is obtained by repeating the mixing solution of the titration procedure by adding water and stirring three times, and cleaning the mixed solution. Adding water and stirring three times and then separating the solid-liquid layer by high-speed centrifuge. It is known from Table 3 that the cleaner the cleaning degree, the lower the specific capacitance drop procedure, because the impurities in the material account for the majority of NaCl. It is a strong electrolyte, it will not The removal of pure metal ions can reduce the interference of electrochemical factors during the test. Therefore, the original electrode material properties appear and the cycle is stable. ____Year 3 _ Medium wash Clean and clean 106179.doc -12-

1278881 10 mV/s 2 mV/s 10 mV/s 2 mV/s The specific capacitance value decreases by 16% over 100 turns. The specific capacitance value decreases by 4% over 100 turns. Table 4 shows the process of preparing the capacitor electrode in different gas atmospheres. The effect of heat treatment is carried out. After heat treatment at 200 °C/2Hr in an oxygen, nitrogen or argon atmosphere, the cycle characteristics of the specific capacitance are different. The heat cycle of the material obtained after heat treatment in oxygen atmosphere is the best. The possible reason is that it can be produced under oxygen atmosphere. Stabilizing the oxide, and causing the overall structure of the electrode material to be loose, and the electrochemical properties of the amorphous phase yttrium oxide are activated to make the electron transport smoother. 'The electric double layer reaction of the electrode material and the active area of the bulk material are increased. The use of nitrogen and argon is detrimental to the presence of water of crystallization, resulting in lower specific capacitance and poorer cycle durability. Table 4 Drying Environment Oxygen Nitrogen Argon Drying Temperature/Time 200 eC/2Hr 200 °C/2Hr 200 °C/2Hr Specific capacitance value 280 F/g 200 F/p 244 F/g Specific capacitance cycle characteristic specific capacitance value The constant ratio of capacitance decreases compared to the capacitance value. Figure 2 and Figure 3 show the effect of the weight of the electrode material on the capacitance. Whether it is simply tested with toner or electrode material, it is known that a smaller weight (ie, equivalent to a thinner thickness) can result in a larger specific capacitance value because the reaction is an integral block, not limited to the surface area. The larger the thickness of the bulk material can be coated and infiltrated by the electrolyte. The higher the utilization efficiency, the lower the overall utilization of the thicker bulk material, and the lower the electrolysis (4). -13- 1278881 • Yes, so the resistance is increased and the specific capacitance is reduced. However, as the thickness becomes smaller - the smaller it does not result in an indefinite increase in specific capacitance, which is limited by the maximum number of transfers of hydrogen protons in the metal oxide.圊4 and 囷5 exemplify a Cyclic Voltammetry of the capacitor electrode of the first embodiment of the present invention. Circle 4 and Figure 5 were subjected to cyclic voltammetry at scan rates of 10 mV/s and 50 mV/s, respectively, and converted to a specific capacitance of about 400 Farads/gram. That is, the capacitor electrode prepared by the present invention maintains excellent capacitance characteristics and specific capacitance values at different scanning rates.囷6 and Fig. 7 illustrate a constant current test chart of the capacitor electrode of the first embodiment of the present invention. The 囷6 and 囷7 series were tested at a current density of 10 mA/cm 2 and 50 mA/cm 2 , respectively, and the capacitance behavior of the capacitor electrode prepared by the present invention did not change significantly, and the pressure drop thereof was reduced. Fig. 8 is a view showing a cycle test chart of the capacitor electrode of the first embodiment of the present invention, which was subjected to 200 cycles of testing at 10 mV/s. As shown, the specific capacitance value of the capacitor electrode of the present invention does not decrease as the cycle test progresses, indicating that it has better durability. In other words, the capacitor electrode of the present invention has the advantages of improving the durability of the electrode material and improving the specific capacitance characteristics. 0 The specific surface area of the electrode material has a relative influence on the capacitance value, and it is desirable for us to reduce the concentration of the starting solution and grow it. The cerium oxide particles are less concentrated to increase the specific surface area of the electrode material. Since the carbon material and the cerium compound of the starting solution are formulated in a 50% by weight ratio, the residual content of Ru 〇 2 is also close to 50% by TGA after the completion of the experiment, so the same ratio of the electrode material can be used to reduce the concentration of the starting liquid. Increase the specific surface area of the electrode material and increase the specific capacitance value of 106179.doc • 14-1278881, as shown in Table 5 below. Table 5 Experimental initial titration ratio Table capacitance value---- TGA measurement code 5 Tiger liquid concentration rate area Exp 1 0.1Μ 20s/cc 250m2/g 312F/g®10mV/s ^ 1 0 / Εχρ2 0.01Μ 20s/cc 338m2/g 349F/g (%10mV/s - J JL /〇47% Εχρ3 0.001Μ 20s/cc 45 lm2/g 404F/g(5)y10mV/s 52%

Fig. 9 is a flow chart showing the preparation of the capacitor electrode of the second embodiment of the present invention. First, a first mixed solution is prepared by using a bismuth halide and an inorganic material. Preferably, the inorganic material is hexagonal or cubic, or other possible forms, and wherein the dentate can be cesium trifluoride or trigas. Huayu, three desertification or triiodide. Thereafter, the first mixed solution separation process is allowed to stand in a vacuum pumping environment, and after the liquid is subjected to a period of time (for example, 24 hours), a first core machine separates the first precipitate from the first mixed solution. It is a mixture of halogenated nails and oxidized dreams. Separating a first precipitate from the first mixed solution, wherein the first solid-liquid separation procedure may be to stir the first mixed solution by ultrasonic vibration and then use the use-test solution and the first precipitate after the separation The second mixed solution q towel secret solution solution potassium hydroxide aqueous solution or sodium hydroxide aqueous solution is preferably used, the titration rate of the aqueous solution of the first sediment is titrated by 5 to 40 seconds / cubic centimeter. Between (s), the steps may include performing a -first-titration procedure; quenching the mixed solution - a predetermined time and entering a second titration procedure, wherein the end of the first titration procedure is about yang

106179.doc 100210 \ 100179 005029515-1 •15- 1278881 The value is 6.8 and the end of the second titration procedure is approximately pH 〇7〇. Since the acid-base titration reaction takes time to complete the reaction, the present invention utilizes a two-stage titration procedure to ensure that the acid-base titration reaction is completely uniform. The predetermined B-situ relationship in which the second mixed solution is allowed to stand depends on the volume (cc), the concentration (M), and the titration rate, wherein the predetermined time is at least 10 minutes. Next, a second solid-liquid separation process is carried out by means of a high-speed centrifuge, and a second sediment is separated from the second mixed solution, which is a mixture of ruthenium (Ru〇x) and ruthenium oxide. Thereafter, the second precipitate is sintered at a high temperature of 120 to 16 (preferably 15 Torr. for about 20 to 40 hours (preferably 24 hours) to form ruthenium dioxide (Ru〇2) and Preferably, the sintered second precipitate is ground and the above steps are repeated to obtain a higher yield. Then the second precipitate is removed by using an etching solution (including hydrofluoric acid). The inorganic material (ie, cerium oxide) is washed and dried with deionized water to obtain cerium oxide as shown in the diffraction diagram of FIG. 10 (which is prepared by using a hexagonal stacked oxidized stone powder). After removing the oxidized stone, a second heat treatment process may be performed in an oxygen-containing environment at a temperature of 18 0 to 250 ° C for 1 to 4 hours to complete the second precipitate. After the yttrium oxide is completed, a bond is utilized. The cerium oxide is formulated into a gel with an organic solvent, and the gel is coated on a titanium metal substrate. The titanium metal substrate is first immersed in a high concentration acidic solution heated at a suitable temperature for a period of time. Roughening the surface to facilitate coating of the gel Thereafter, the titanium metal substrate coated with the gel is dried by infrared heating, and the gel on the titanium metal substrate is pressed by a roller. Then, the finished product of the size of 106179.doc -16 - 1278881 is cut and The capacitor electrode is completed by connecting a wire. Preferably, the binder is selected from the group consisting of polyvinylidene fluoride, polytetrafluoroethylene and polyvinyl alcohol, and the acidic solution may be a hydrochloric acid, sulfuric acid or nitric acid solution. The cyclic voltammetry test chart of the capacitor electrode of the second embodiment of the invention is performed by cyclic voltammetry at a scan rate of lmV/s, 10 mV/s, 50 mV/s, and 100 mV/s, respectively, converted into a specific capacitance value, and The conventional art comparison is shown in Table 6. That is, the capacitor electrode prepared by the present invention can maintain excellent capacitance characteristics and specific capacitance values at different scanning rates. In particular, the second embodiment of the present invention is prepared. The specific capacitance value of the capacitor electrode is approximately twice the specific capacitance of the prior art. Scan rate (mV/s) Specific capacitance value (F/e) Conventional skill (F/g) 1 1360 670 10 1233 620 50 1030 100 904 460 200 639 460

Fig. 12 is a view showing a constant current test chart of the capacitor electrode of the second embodiment of the present invention. Tested at a current density of 10 mA/cm 2 , 30 mA/cm 2 , 50 mA/cm 2 , 8 〇 mA/cm 2 , and 100 mA/cm 2 , respectively, the capacitance behavior of the capacitor electrode prepared in the second embodiment of the present invention does not change significantly, and Its voltage drop decreases as the test current decreases. The technical content and technical features of the present invention have been disclosed as above, but those skilled in the art can still make various alternatives and modifications from the spirit and scope of the present invention based on the teachings and disclosures of the present invention. Therefore, the scope of the present invention should be construed as being limited by the scope of the appended claims. [Simplified Explanation of 囷] 囷1 is a preparation flow of the capacitor electrode of the first embodiment of the present invention, and 囷2 and 囷3 show the influence of the weight of the electrode material on the capacitance;

囷4 and FIG. 5 illustrate a cyclic voltammetry test circle of the capacitor electrode of the first embodiment of the present invention; 囷6 and 囷7 illustrate a constant current circle 8 of the capacitor electrode of the first embodiment of the present invention, which is exemplified by the first embodiment of the present invention. Cycle test diagram of the capacitor electrode, FIG. 9 illustrates a flow chart for preparing the capacitor electrode of the second embodiment; 绕10 diffraction patterns of the electrode material not according to the second embodiment of the present invention; 囷11 cases not according to the invention The cyclic voltammetry 12 of the capacitor electrode of the second embodiment exemplifies the capacitor electrode U current test of the second embodiment of the present invention. [Key element symbol description] (none) 106179.doc • 18 -

Claims (1)

1278881 X. Patent Application Range: L A method for preparing an electrode material, comprising the steps of: preparing a first mixed solution by using a gingival sputum and an inorganic material; performing a first solid-liquid separation process to separate the first mixed solution a first precipitate is prepared; a second mixed solution is prepared by using an alkaline solution and the first precipitate; σ ' is subjected to a second solid-liquid separation process, and a second precipitate is separated from the second mixed solution Sintering the second precipitate; and removing the inorganic material of the second precipitate to form the electrode material. 2. The method of preparing an electrode material according to claim 1, wherein the inorganic material is bismuth telluride powder, and the electrode material is cerium oxide. 3. The method of preparing an electrode material according to claim 2, wherein the cerium oxide powder is hexagonal or cubic. 4. The method of preparing an electrode material according to claim 1, wherein the inorganic material from which the second killing material is removed utilizes an etching solution. The method of producing an electrode material according to claim 4, wherein the etching solution contains hydrogen IL acid. 6. The method of preparing an electrode material according to claim 1, wherein the first solid-liquid separation process comprises: oscillating the first mixed solution by ultrasonic waves; and separating the first pedestal from the first mixed solution by using a centrifuge Things. The method for preparing an electrode material according to claim 1, wherein a second mixed solution is prepared by using an alkaline solution 106179.d〇c 1278881 solution and the first precipitate, and the first precipitate is titrated with the alkaline solution. An aqueous solution. 8. The method of preparing an electrode material according to claim 7, wherein the titration of the aqueous solution of the first precipitate by using the test solution comprises: performing a first titration procedure, the end point is pH 6.8; and the second mixed solution is allowed to stand. a predetermined time; and a second titration procedure with an end point of pH 7.0. 9. The method of preparing an electrode material according to claim 8, wherein the predetermined time is at least 10 minutes. The preparation method of the electrode material according to claim 7, wherein the titration rate of the aqueous solution of the first sediment is set to be 5 to 40 seconds/cm 3 by using the test solution. II. The method for producing an electrode material according to claim 1, wherein the test solution is an aqueous potassium hydroxide solution or an aqueous sodium arsenate solution. 12. The method of preparing an electrode material according to claim 1, further comprising performing a heat treatment process to activate the precipitate. 13. The method of preparing an electrode material according to claim 12, wherein the heat treatment process is carried out in an oxygen-containing atmosphere at a temperature of from 180 to 250X for from 1 to 4 hours. 14) A method for preparing an electrode material, comprising the steps of: formulating a mixed solution by using cerium and carbon powder; titrating the mixed solution with an assay solution to form a sediment; separating the precipitate; drying the precipitate; And performing a heat treatment process to activate the precipitate. 106179.doc -2- 1278881 15. The method of preparing the electrode material according to claim 14, wherein the weight ratio of the cerium-containing compound to the carbon powder is between 1:2 and 1:0.125. The method for preparing an electrode material according to claim 14, wherein the titrating the mixed solution with an alkaline solution comprises: performing a first titration procedure, the end point being pH 6.8; allowing the mixed solution to stand for a predetermined time; A second titration procedure with an endpoint of pH 7.0. 17. The method of preparing an electrode material according to claim 16, wherein the predetermined time is at least 10 minutes. 18. The method of preparing an electrode material according to claim 14, wherein the titration rate of the mixed solution is titrated by 5 to 4 sec/cm 3 using an assay solution. 19. The preparation method of the electrode material according to claim 14. The method further comprises the following steps before separating the sediment: stirring to complete the titrated mixed solution; and performing a plurality of washing procedures with deionized water. 20. The method of preparing an electrode material according to claim 14, wherein the separating the precipitate is performed using a high speed centrifuge. The step of preparing the electrode material according to claim 14, wherein the heat treatment process is carried out in an oxygen-containing atmosphere at a temperature of from 18 Torr to 250 Torr for 4 hours. The method for preparing an electrode material according to claim 14, further comprising the step of drying the capacitor electrode of the capacitor, comprising the steps of: preparing a first mixed solution by using cerium hydride and an inorganic material; 106179.doc 1278881 Performing a first solid-liquid separation process, separating a first sediment from the first mixed solution; formulating a second mixed solution by using an alkaline solution and the first precipitate; .../ performing a second solid solution a separation process, separating a first sink from the second mixed solution; sintering the second sink; removing the inorganic material of the second precipitate to form an electrode material; using the electrode material and a binder is formulated with a gel; and the gel is applied to a metal substrate. The method of producing a capacitor electrode according to claim 23, wherein the binder is selected from the group consisting of polyvinylidene fluoride, polytetrafluoroethylene, and polyvinyl alcohol. The method of producing a capacitor electrode according to claim 23, wherein the metal substrate is made of titanium metal. 26. The method of preparing a capacitor electrode according to claim 23, wherein the metal substrate is immersed in the heated acidic solution prior to coating. 27. The method of preparing a capacitor electrode according to claim 26, wherein the acidic solution is a solution of citric acid, sulfuric acid or nitric acid. 28. The method of preparing a capacitor electrode according to claim 23, further comprising the step of heating and drying the metal substrate coated with the gel by infrared rays. A method of producing a capacitor electrode according to claim 23, further comprising the step of rolling the gel on the metal substrate with a roller. The method of producing a capacitor electrode according to claim 23, wherein the inorganic material is cerium oxide powder, and the electrode material is cerium oxide. The method of preparing a capacitor electrode according to claim 30, wherein the oxidized oxide powder is hexagonal or cubic. The method of producing a capacitor electrode according to claim 23, wherein the inorganic material from which the second precipitate is removed utilizes an etching solution. 33. The method of preparing a capacitor electrode according to claim 32, wherein the etching solution comprises argon fluoride. 34. The method of preparing a capacitor electrode according to claim 23, wherein the first solid-liquid separation procedure comprises: - oscillating the first mixed solution by ultrasonic waves; and separating the first mixed solution from the first mixed solution by using a centrifuge A method for preparing a capacitor electrode according to claim 23, wherein a second mixed solution is prepared by using an assay solution and the first precipitate, and the aqueous solution of the first sediment is titrated with the alkaline solution. 3 6 · The preparation method of the capacitor electrode according to claim 3, wherein the aqueous solution of the first substrate is titrated by using the φ solution: a first titration procedure is performed, and the end point is pH 6,8; The second mixed solution is allowed to stand for a predetermined time; and a second titration procedure is performed, the end point being {) 11 value 7 (). 37. A method of making a capacitor electrode according to claim 36, wherein the predetermined time is at least 10 minutes. 38. The method of preparing a capacitor electrode according to claim 35, wherein the titration rate of the aqueous solution of the temple is set to be 5 to 40 seconds per cubic centimeter. The method of preparing a capacitor electrode according to claim 23, wherein the alkaline solution is an aqueous solution of a hydroxide or an aqueous solution of sodium hydroxide. 4. The method of preparing a capacitor electrode according to claim 23, further comprising performing a heat treatment process to activate the precipitate. 41. The method of preparing a capacitor electrode according to claim 40, wherein the heat treatment process is carried out at an temperature of from 180 to 250 ° C in an oxygen-containing atmosphere! Up to 4 hours.馨42· A method for preparing a capacitor electrode, comprising the steps of: preparing a mixed solution by using hydrazine and carbon powder; titrating the mixed solution with an alkaline solution to form a precipitate; separating the precipitate; drying the precipitate Activating the substrate to form an electrode material; formulating a gel using the electrode material and a binder; and coating the gel on a metal substrate. The method of preparing a capacitor electrode according to claim 42, wherein the binder is selected from the group consisting of polyvinylidene fluoride, polytetrafluoroethylene, and polyvinyl alcohol. 44. The method of preparing a capacitor electrode according to claim 42, wherein the metal substrate is made of titanium metal. 45. The method of preparing a capacitor electrode according to claim 42, wherein the metal substrate is immersed in the heated acidic solution prior to coating. The method of producing a capacitor electrode according to claim 45, wherein the acidic solution is a solution of citric acid, sulfuric acid or nitric acid. 47. The method of preparing a capacitor electrode according to claim 42, further comprising the step of heating and drying the metal substrate coated with the gel by red 106179.doc 1278881. 48. The method of preparing a capacitor electrode according to claim 42, further comprising the step of rolling the gel on the metal substrate with a roller. 49. The method of preparing a capacitor electrode according to claim 42, wherein the weight ratio of the toothed nail to the carbon powder is between 1:2 and 1: 〇·ΐ25. 50. A method of preparing a capacitor electrode according to claim 42, wherein the alkaline solution is sodium argon oxide or potassium argon oxide. The method for preparing a capacitor electrode according to claim 42, wherein the mixing solution is titrated with an alkaline solution, and the first titration procedure is performed, wherein the end point is 1) 11 value 6.8; and the mixed solution is allowed to stand for a predetermined time. And a second titration procedure with an end point of pJ^A7.〇. 52. The method of preparing a capacitor electrode according to claim 51, wherein the predetermined time is at least 10 minutes. 53. The method of preparing a capacitor electrode according to claim 42, wherein the titration rate of the mixed solution is titrated by a basic solution. 54. The method of preparing a capacitor electrode according to claim 42, wherein the following step is additionally included before the separation of the precipitate: agitating the mixed solution of the titration; and performing a plurality of washing procedures with deionized water. 55. Method of Preparing Capacitor Electrode According to Item 42 The sediment system utilizes a high speed centrifuge. The capacitor is electrically activated according to claim 42 and wherein the precipitate is activated by heat treatment at a temperature of 180 to 250 ° C for 1 to 4 hours in an oxygen-containing atmosphere. 57. The method of preparing a capacitor electrode according to claim 42, further comprising the step of drying the carbon powder. 106179.doc