CN112479207B - Method for recycling active carbon, electric double layer capacitor comprising active carbon obtained by recycling method and preparation method of electric double layer capacitor - Google Patents
Method for recycling active carbon, electric double layer capacitor comprising active carbon obtained by recycling method and preparation method of electric double layer capacitor Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/336—Preparation characterised by gaseous activating agents
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/318—Preparation characterised by the starting materials
- C01B32/324—Preparation characterised by the starting materials from waste materials, e.g. tyres or spent sulfite pulp liquor
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/354—After-treatment
- C01B32/36—Reactivation or regeneration
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
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- 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
Abstract
The invention relates to a recovery method of active carbon, an electric double layer capacitor comprising the active carbon recovered by the recovery method and a preparation method thereof, and belongs to the field of capacitor preparation. The method comprises the steps of placing a mask containing active carbon in an oxidation stabilizing furnace for stabilizing treatment, then performing carbonization treatment in a high-temperature carbonization furnace at 700-850 ℃, and then performing CO treatment 2 Or O 3 The activated carbon is obtained by activating treatment under the oxidizing atmosphere, circulating and rinsing, purifying treatment in a vacuum carbonization furnace at 800-1000 ℃, and finally recovery after air current crushing and grading treatment. The method for obtaining the active carbon for the low-cost double-layer capacitor by using the active carbon mask is realized, stable and uniform mixing of the active carbon slurry is realized by gradually reducing the solid content of the slurry, the cylindrical double-layer capacitor with high energy density and high power is formed, and the whole preparation process is simple, can be scaled and is beneficial to large-scale harmless treatment of the disposable mask.
Description
Technical Field
The invention relates to a recovery method of active carbon, an electric double layer capacitor comprising the active carbon recovered by the recovery method and a preparation method thereof, and belongs to the field of capacitor preparation.
Background
The double-layer capacitor is used as a novel energy storage device, and is a core power core in the fields of rail transit, wind power generation, intelligent four-meter, military industry and the like due to the characteristics of high power density (capable of realizing second-level charging), long service life (the service life can reach more than 10 years), good temperature characteristic (no difference exists between electrochemical characteristics of products at 65 ℃ below 40 ℃), environment friendliness and the like. As a core energy storage material of an electric double layer capacitor, in addition to carrying the energy storage and release functions of the device, cost control of activated carbon has become an important issue in the electric double layer capacitor industry (the cost of activated carbon is about 30-40% of the cost of electric double layer capacitor). At present, the active carbon which can meet the requirement of large-scale use of the double-layer capacitor is limited by factors such as raw materials, manufacturing process and the like, has few reports, and the market price is more than 15 ten thousand/t, and is represented by high-capacity active carbon mainly used for the double-layer capacitor and the coconut shell series of Japanese colali company.
Chinese patent CN101844765B discloses a method for preparing activated carbon for super capacitor carbon electrode, which comprises mixing one of coal pitch-based, mesophase pitch-based, petroleum coke-based and needle-shaped Jiao Ji amphiphilic carbon materials with sodium hydroxide, adding deionized water, stirring, drying, grinding to obtain mixed powder, activating the mixed powder, cooling, cleaning, drying, and grinding to obtain activated carbon for super capacitor. However, the preparation process still has the defects of high production cost, inapplicability to industrial production and the like. As such, it is difficult to reduce the product price of the activated carbon for an electric double layer capacitor and the energy storage element thereof.
Disclosure of Invention
In view of the existing problems of the activated carbon, the present invention provides a method for recovering activated carbon, an electric double layer capacitor comprising the activated carbon recovered by the method, and a method for preparing the same, wherein the activated carbon for the electric double layer capacitor is obtained at low cost by using a disposable mask, and the electric double layer capacitor with high energy density and high power is obtained by using the activated carbon.
The aim of the invention is realized by the following technical scheme:
a method for recovering activated carbon, characterized in that the method comprises the following steps: firstly placing a mask containing active carbon in an oxidation stabilizing furnace for stabilizing treatment, then carbonizing in a high-temperature carbonization furnace at 700-850 ℃, and then placing in CO 2 Or O 3 Performing activation treatment under the oxidation atmosphere, performing cyclic rinsing, and purifying in a vacuum carbonization furnace at 800-1000 DEG CFinally, the activated carbon is recovered after the air current crushing and grading treatment.
The production capacity of the masks occupies more than 50% of the world, and a great part of the masks are internally provided with activated carbon for absorbing organic gases, malodors, toxic dust and the like, but the masks are often used as disposable products and are not effectively reused, so that great waste is caused. Particularly, activated carbon which adsorbs various toxic gases or toxic solutions, and water sources, air and even surrounding environment can be seriously influenced by random treatment or improper treatment. The active carbon suitable for the double-layer capacitor is obtained through oxidation stabilization, high-temperature carbonization, high-temperature activation and vacuum purification of the mask, the process is simple, industrial production can be realized, and harmless treatment can be carried out on the mask in a one-step large scale.
The cotton cloth in the mask is easy to form fluid under the high temperature condition, oxidation stabilization means that the cotton cloth is oxidized and fixed, no fluid is formed, then carbon is formed under the high temperature condition, the process is called high temperature carbonization, then high temperature activation is carried out to form new active carbon, and then impurities are removed through vacuum purification. The lack of oxidation stabilization treatment can cause unstable quality of the finished product, the lack of high-temperature carbonization treatment can cause low yield of the product, the lack of activation treatment can not form new activated carbon, and the lack of purification treatment can cause insufficient purity of the product.
In the above method for recovering activated carbon, the gas in the stabilization treatment is air or O 2 One or two of the above gases has a gas flow rate of 0.5-2L/min, a temperature of 200-350 ℃, a temperature rising rate of 0.5-2 ℃/min and a time of 12-24h. After stabilization treatment, the molecular structure in the mask is changed, molecular crosslinking is carried out, and organic carbon is fixed, so that fluid is not formed during high-temperature carbonization.
In the method for recycling the activated carbon, the gas in carbonization treatment is nitrogen or argon, the gas flow rate is 1-5L/min, the heating rate is 1-5 ℃/min, and the time is 6-12h.
In the above method for recovering active carbon, the gas flow rate in the activation treatment is 0.5-3L-min, the temperature is 750-900 ℃, the temperature rising rate is 1-5 ℃/min, and the time is 6-12h. Oxidative stabilization of formed carbon at CO 2 Or O 3 The stable activation pore-forming is carried out under the atmosphere and at a fixed flow rate temperature.
In the above method for recovering activated carbon, the cyclic rinse includes alkali wash, acid wash, and water wash.
In the method for recycling the activated carbon, the temperature in the purification treatment is 800-1000 ℃, the vacuum degree is less than or equal to 100Pa, and the time is 6-24 hours.
In the method for recycling the activated carbon, the specific surface area of the recycled activated carbon is 1450-1700m 2 /g，D 50 The grain diameter is 5-8 mu m, the content of surface functional groups is 0.1-0.4meq/g, and the ash content is less than or equal to 0.4%. The specific surface area, particle size, surface functional group content and ash content of the activated carbon affect the specific energy, specific power and life safety of the electric double layer capacitor.
An electric double layer capacitor, the active material of which comprises conductive carbon black and the active carbon recovered by the recovery method.
A method of manufacturing an electric double layer capacitor, the method comprising the steps of:
(1) Weighing the raw materials: weighing 85-90 parts of active carbon, 5-8 parts of conductive carbon black, 2-4 parts of styrene butadiene rubber and 1-3 parts of sodium hydroxymethyl cellulose which are recovered by the recovery method;
(2) Preparing sodium hydroxymethyl cellulose into a glue solution with the solid content of 1-3wt% by using deionized water;
(3) Mixing active carbon and conductive carbon black, and adding sodium hydroxymethyl cellulose glue solution into the mixture of the active carbon and the conductive carbon black for three times to form slurry;
(4) Adding deionized water and uniformly mixing to ensure that the solid content of the slurry is 30-35%;
(5) Adding styrene-butadiene rubber to mix to form slurry for the double-layer capacitor;
(6) The slurry for the double-layer capacitor is subjected to coating, rolling, slitting, winding, assembling, drying, liquid injection, aging and detection treatment to obtain the double-layer capacitor.
Wherein, carbon black is used as a conductive agent, styrene-butadiene rubber is used as a binder, and final viscosity is adjusted by sodium hydroxymethyl cellulose.
In the preparation method of the electric double layer capacitor, the three-time addition of the sodium hydroxymethyl cellulose glue solution comprises the following steps: the solid content of the slurry is 65-75% after the sodium hydroxymethyl cellulose is added for the first time; the solid content of the slurry after adding the sodium hydroxymethyl cellulose for the second time is 50-65%; the solid content of the slurry after the third addition of the sodium hydroxymethyl cellulose is 40-48%. The solid content of the slurry can influence the electrode density and the capacitor capacity, and the invention controls the solid content of the slurry by adding the sodium hydroxymethyl cellulose glue solution for three times so as to achieve the optimal effect of the electrode density and the capacitor capacity.
Compared with the prior art, the invention has the following advantages: the invention utilizes 'oxidation stabilization + high temperature carbonization + high temperature activation + vacuum purification' to realize the method for utilizing the active carbon mask to obtain the active carbon for the low-cost double-electric-layer capacitor, and realize the stable, homogeneous mixing of the active carbon slurry by gradually reducing the solid content of the slurry, thus forming the cylindrical double-electric-layer capacitor with high energy density and high power, and the whole preparation process is simple, can be scaled, and is beneficial to the large-scale harmless treatment of the disposable mask.
Drawings
Fig. 1 is a flowchart of the preparation of activated carbon for electric double layer capacitor using the recovery mask of example 1.
Detailed Description
The following are specific examples of the present invention, and the technical solutions of the present invention are further described, but the present invention is not limited to these examples.
Example 1:
10kg of mask containing active carbon is placed in an oxidation stabilization furnace, heated to 300 ℃ at a heating rate of 0.5 ℃/min, and then is filled with air with a flow rate of 0.5L/min, and the mask is subjected to constant temperature treatment for 12 hours. Then heating to 800 ℃ for constant temperature treatment for 6 hours at a heating rate of 2 ℃/min under the nitrogen protection atmosphere of a high-temperature carbonization furnace. Naturally cooling to room temperature, transferring to an activation furnace, heating to 850 deg.C at a heating rate of 2 deg.C/min, and introducing into a flow rate of 1L/minCO 2 The gas was subjected to an activation treatment for 6 hours to give 1.5kg of a product.
After natural cooling to room temperature, 1.5kg of the product was added to a 1M KOH solution for alkaline washing, filtered and transferred to a 0.5M HCl solution for acid washing. After filtration, the above material was transferred to deionized water for washing. Repeating the above process for 3 times, and then drying the material at 80 ℃/12 h.
And (3) placing the dried material in a vacuum purification furnace which is heated to 1000 ℃ at a heating rate of 5 ℃/min under the protection of argon, calcining at constant temperature for 12 hours, and naturally cooling to room temperature, wherein the vacuum degree is lower than-95 Pa. Transferring the materials into a jet mill, and crushing, grading and recycling the materials to obtain the activated carbon.
Example 2:
15kg of mask containing active carbon is placed in an oxidation stabilization furnace, heated to 250 ℃ at a heating rate of 0.2 ℃/min, and then is filled with air with a flow rate of 1.0L/min for constant temperature treatment for 20 hours. Then heating to 800 ℃ for constant temperature treatment for 12 hours at a heating rate of 3 ℃/min under the nitrogen protection atmosphere of a high-temperature carbonization furnace. Naturally cooling to room temperature, transferring to an activation furnace, heating to 850 deg.C at a heating rate of 2 deg.C/min, and introducing CO at a flow rate of 1L/min 2 The gas was subjected to an activation treatment for 12 hours to give 3.2kg of a product.
After natural cooling to room temperature, 3.2kg of the product was added to a 1.0M KOH solution for alkaline washing, filtered and transferred to a 1.0M HCl solution for acid washing. After filtration, the above material was transferred to deionized water for washing. Repeating the above process for 3 times, and then drying the material at 80 ℃/12 h.
And (3) placing the dried material in a vacuum purification furnace which is heated to 900 ℃ at a heating rate of 2 ℃/min under the protection of argon, calcining at constant temperature for 24 hours, and naturally cooling to room temperature, wherein the vacuum degree is lower than-95 Pa. Transferring the materials into a jet mill, and crushing, grading and recycling the materials to obtain the activated carbon.
Example 3:
placing 12kg mask containing active carbon in oxidation stabilization furnace, and heating at heating rate of 0.2 deg.C/minAnd (3) introducing air with the flow rate of 1.5L/min at the temperature of 350 ℃, and carrying out constant-temperature treatment for 24h. Then heating to 750 ℃ for constant temperature treatment for 12 hours at a heating rate of 3 ℃/min under the nitrogen protection atmosphere of a high-temperature carbonization furnace. Naturally cooling to room temperature, transferring to an activation furnace, heating to 900 deg.C at a heating rate of 1 deg.C/min, and introducing CO at a flow rate of 0.5L/min 2 The gas was subjected to an activation treatment for 12 hours to give 3.0kg of a product.
After natural cooling to room temperature, 3.0kg of the product was added to a 0.5M KOH solution for alkaline washing, filtered and transferred to a 1.0M HCl solution for acid washing. After filtration, the above material was transferred to deionized water for washing. Repeating the above process for 3 times, and then drying the material at 80 ℃/12 h.
And (3) placing the dried material in a vacuum purification furnace which is heated to 800 ℃ at a heating rate of 5 ℃/min under the protection of argon, calcining at constant temperature for 24 hours, and naturally cooling to room temperature, wherein the vacuum degree is lower than-98 Pa. Transferring the materials into a jet mill, crushing, grading and recycling the materials to obtain the active carbon
Example 4:
placing 10kg mask containing active carbon into oxidation stabilization furnace, heating to 300deg.C at heating rate of 0.5 deg.C/min, and introducing O with flow rate of 0.5L/min 2 And (5) performing constant temperature treatment for 12h. Then heating to 800 ℃ for constant temperature treatment for 6 hours at a heating rate of 2 ℃/min under the argon protection atmosphere of a high-temperature carbonization furnace. Naturally cooling to room temperature, transferring to an activation furnace, heating to 850 deg.C at a heating rate of 2 deg.C/min, and introducing O at a flow rate of 1L/min 3 The gas was subjected to an activation treatment for 6 hours to give 1.5kg of a product.
After natural cooling to room temperature, 1.5kg of the product was added to a 1M KOH solution for alkaline washing. After filtration, the solution was transferred to a 0.5M HCl solution for pickling. After filtration, the above material was transferred to deionized water for washing. Repeating the above process for 3 times, and then drying the material at 80 ℃/12 h.
And (3) placing the dried material in a vacuum purification furnace which is heated to 1000 ℃ at a heating rate of 5 ℃/min under the protection of argon, calcining at constant temperature for 12 hours, and naturally cooling to room temperature, wherein the vacuum degree is lower than-95 Pa. Transferring the materials into a jet mill, and crushing, grading and recycling the materials to obtain the activated carbon.
Example 5:
85 parts of activated carbon, 6 parts of conductive carbon black, 3 parts of styrene-butadiene rubber and 2 parts of sodium hydroxymethyl cellulose, which are obtained by recycling in example 1, are weighed.
And preparing the sodium hydroxymethyl cellulose into a glue solution with the solid content of 2wt% by using deionized water.
Mixing active carbon and conductive carbon black, and then adding sodium hydroxymethyl cellulose glue solution into the mixture for three times to form slurry; the solid content of the slurry is 70% when the sodium hydroxymethyl cellulose is added for the first time; the solid content of the slurry is 60% when the sodium hydroxymethyl cellulose is added for the second time; the slurry solids content was 45% when sodium hydroxymethyl cellulose was added for the third time.
Deionized water is added to be evenly mixed, so that the solid content of the slurry is 30 percent.
And adding styrene-butadiene rubber to mix to form the slurry for the double-layer capacitor.
The slurry for the double-layer capacitor is coated, rolled, cut, coiled, assembled, dried, injected with liquid, aged and detected to obtain the 2.7V double-layer capacitor with the diameter of 60mm and the height of 140 mm.
Example 6:
90 parts of the activated carbon recovered in example 2, 8 parts of conductive carbon black, 4 parts of styrene-butadiene rubber and 3 parts of sodium hydroxymethyl cellulose are weighed.
The sodium hydroxymethyl cellulose is prepared into glue solution with 3wt% of solid content by deionized water.
Mixing active carbon and conductive carbon black, and then adding sodium hydroxymethyl cellulose glue solution into the mixture for three times to form slurry; the solid content of the slurry is 75% when sodium hydroxymethyl cellulose is added for the first time; the solid content of the slurry is 65% when the sodium hydroxymethyl cellulose is added for the second time; the slurry solids content was 48% when sodium hydroxymethyl cellulose was added for the third time.
Deionized water is added to be evenly mixed, so that the solid content of the slurry is 35 percent.
And adding styrene-butadiene rubber to mix to form the slurry for the double-layer capacitor.
The slurry for the double-layer capacitor is coated, rolled, cut, coiled, assembled, dried, injected with liquid, aged and detected to obtain the 2.7V double-layer capacitor with the diameter of 60mm and the height of 140 mm.
Example 7:
85 parts of activated carbon, 5 parts of conductive carbon black, 2 parts of styrene-butadiene rubber and 1 part of sodium hydroxymethyl cellulose, which are obtained by recycling in example 3, are weighed.
The sodium hydroxymethyl cellulose is prepared into glue solution with the solid content of 1 weight percent by deionized water.
Mixing active carbon and conductive carbon black, and then adding sodium hydroxymethyl cellulose glue solution into the mixture for three times to form slurry; the solid content of the slurry is 65% when the sodium hydroxymethyl cellulose is added for the first time; the solid content of the slurry is 50% when the sodium hydroxymethyl cellulose is added for the second time; the slurry solids content was 40% when sodium hydroxymethyl cellulose was added for the third time.
Deionized water is added to be evenly mixed, so that the solid content of the slurry is 30 percent.
And adding styrene-butadiene rubber to mix to form the slurry for the double-layer capacitor.
The slurry for the double-layer capacitor is coated, rolled, cut, coiled, assembled, dried, injected with liquid, aged and detected to obtain the 2.7V double-layer capacitor with the diameter of 60mm and the height of 140 mm.
Example 8:
85 parts of activated carbon, 6 parts of conductive carbon black, 3 parts of styrene-butadiene rubber and 2 parts of sodium hydroxymethyl cellulose, which are obtained by recycling in example 4, are weighed.
And preparing the sodium hydroxymethyl cellulose into a glue solution with the solid content of 2wt% by using deionized water.
Mixing active carbon and conductive carbon black, and then adding sodium hydroxymethyl cellulose glue solution into the mixture for three times to form slurry; the solid content of the slurry is 70% when the sodium hydroxymethyl cellulose is added for the first time; the solid content of the slurry is 60% when the sodium hydroxymethyl cellulose is added for the second time; the slurry solids content was 45% when sodium hydroxymethyl cellulose was added for the third time.
Deionized water is added to be evenly mixed, so that the solid content of the slurry is 30 percent.
And adding styrene-butadiene rubber to mix to form the slurry for the double-layer capacitor.
The slurry for the double-layer capacitor is coated, rolled, cut, coiled, assembled, dried, injected with liquid, aged and detected to obtain the 2.7V double-layer capacitor with the diameter of 60mm and the height of 140 mm.
Example 9:
the difference from example 5 is only that, after mixing the activated carbon and the conductive carbon black, a sodium hydroxymethylcellulose glue solution is added to the mixture at one time to form a slurry.
Comparative example 1:
the difference from example 1 is that the mask containing activated carbon was not stabilized.
Comparative example 2:
the difference from example 1 is that the carbonization treatment was not performed after the stabilization treatment.
Comparative example 3:
the difference from example 1 is that no activation treatment was performed after the carbonization treatment.
Comparative example 4;
the difference from example 1 is only that no purification treatment was performed after the activation treatment.
Table 1: examples 1 to 4, comparative examples 1 to 4, activated carbon performance test obtained by recovery
Table 2: test results of electric double layer capacitor Performance prepared in examples 5 to 9
As can be seen from the performance test of the active carbon recovered from the table 1, the active carbon recovered from the active carbon mask by oxidation stabilization, high-temperature carbonization, high-temperature activation and vacuum purification has good physical properties, one step is absent to influence the performance of the finally obtained active carbon, and the active carbon produced by the method has the price which is about 20 percent lower than the market price, so that the production cost of enterprises is greatly reduced.
As can be seen from the test results of the performance of the double-layer capacitor prepared in Table 2, the solid content of the slurry is gradually reduced in the preparation process to realize stable and uniform mixing of the activated carbon slurry, and the double-layer capacitor with the advantages of high energy density, large capacity, less electric leakage and the like is obtained. The aim of preparing the double-layer capacitor by using the low-cost recovered active carbon is fulfilled, and the prepared capacitor has good physical properties compared with a conventional capacitor.
As can be seen from the performance test results of the prepared active carbon and the double-layer capacitor, the preparation process of simple oxidation stabilization, high-temperature carbonization, high-temperature activation and vacuum purification is carried out on the recovery mask, so that the prepared active carbon for the double-layer capacitor has excellent physical and chemical characteristics, and the stable and uniform mixing of the active carbon slurry is realized by gradually reducing the solid content of the slurry, so that the cylindrical double-layer capacitor with the energy density as high as 3-5Wh/kg and the power density of 14-18Kw/kg is formed, and the overall manufacturing process is simple, can be scaled, and is beneficial to the large-scale harmless treatment of the disposable mask.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Various modifications or additions to the described embodiments may be made by those skilled in the art to which the invention pertains or may be substituted in a similar manner without departing from the spirit of the invention or beyond the scope of the appended claims.
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.
Claims (1)
1. A method for manufacturing an electric double layer capacitor, characterized in that the active material of the capacitor comprises conductive carbon black and recovered active carbon;
the method for recycling the activated carbon comprises the following steps: firstly placing a mask containing active carbon in an oxidation stabilizing furnace for stabilizing treatment, then carbonizing in a high-temperature carbonization furnace at 700-850 ℃, and then placing the mask in O 3 Performing activation treatment under the oxidation atmosphere, performing cyclic rinsing, performing purification treatment in a vacuum carbonization furnace at 800-1000 ℃, and finally recycling to obtain active carbon after jet milling classification treatment;
the gas in the stabilization treatment is air or O 2 One or two of the above is/are at a gas flow rate of 0.5-2L/min, a temperature of 200-350 ℃, a heating rate of 0.5-2 ℃/min and a time of 12-24h;
the gas in carbonization treatment is nitrogen or argon, the gas flow rate is 1-5L/min, the heating rate is 1-5 ℃/min, and the time is 6-12h;
the gas flow rate in the activation treatment is 0.5-3L/min, the temperature is 750-900 ℃, the temperature rising rate is 1-5 ℃/min, and the time is 6-12h;
the temperature in the purification treatment is 800-1000 ℃, the vacuum degree is less than or equal to 100Pa, and the time is 6-24 hours;
the specific surface area of the recovered active carbon is 1450-1700m 2 /g，D 50 Particle diameter is 5-8 μm, surface functional group content is 0.1-0.4meq/g, ash content is less than or equal to 0.4%;
the cyclic washing comprises alkali washing, acid washing and water washing;
the preparation method of the double-layer capacitor comprises the following steps:
(1) Weighing the raw materials: weighing 85-90 parts of recovered active carbon, 5-8 parts of conductive carbon black, 2-4 parts of styrene butadiene rubber and 1-3 parts of sodium hydroxymethyl cellulose;
(2) Preparing sodium hydroxymethyl cellulose into a glue solution with the solid content of 1-3wt% by using deionized water;
(3) Mixing active carbon and conductive carbon black, and then adding sodium hydroxymethyl cellulose glue solution into the mixture for three times to form slurry;
(4) Adding deionized water and uniformly mixing to ensure that the solid content of the slurry is 30-35%;
(5) Adding styrene-butadiene rubber to mix to form slurry for the double-layer capacitor;
(6) The slurry for the double-layer capacitor is subjected to coating, rolling, slitting, winding, assembling, drying, liquid injection, aging and detection treatment to obtain the double-layer capacitor;
the three-time adding of the hydroxymethyl cellulose sodium glue solution is as follows: the solid content of the slurry is 65-75% after the sodium hydroxymethyl cellulose is added for the first time; the solid content of the slurry after adding the sodium hydroxymethyl cellulose for the second time is 50-65%; the solid content of the slurry after the third addition of the sodium hydroxymethyl cellulose is 40-48%.
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|---|---|---|---|---|
| CN103213984A (en) * | 2013-03-25 | 2013-07-24 | 中山火炬职业技术学院 | Method for preparing high thermal conductivity active carbon taking waste cotton cloth as raw material |
| CN105384170A (en) * | 2015-10-28 | 2016-03-09 | 武汉纺织大学 | Method for preparing activated charcoal by utilizing waste textile fiber material in molten-salt medium |
| CN108706584A (en) * | 2018-07-15 | 2018-10-26 | 启东创潞新材料有限公司 | A kind of preparation method of cotton fiber matrix activated carbon |
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| KR101896319B1 (en) * | 2016-02-25 | 2018-10-04 | 현대자동차 주식회사 | Activated carbon and method for manufacturing the same |
| CN106145110B (en) * | 2016-07-05 | 2019-01-22 | 中国矿业大学 | A kind of two step process for preparing activated of active carbon and its application in supercapacitor |
| CN106966390B (en) * | 2017-03-15 | 2018-12-04 | 北京林业大学 | A kind of preparation method and products therefrom of alkali lignin matrix activated carbon |
| KR20190069892A (en) * | 2017-12-12 | 2019-06-20 | 한국제이씨씨(주) | Electric double layer capacitor |
| CN109637820A (en) * | 2018-11-30 | 2019-04-16 | 同济大学 | A kind of asymmetric high-energy density double layer capacitor |
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| CN105384170A (en) * | 2015-10-28 | 2016-03-09 | 武汉纺织大学 | Method for preparing activated charcoal by utilizing waste textile fiber material in molten-salt medium |
| CN108706584A (en) * | 2018-07-15 | 2018-10-26 | 启东创潞新材料有限公司 | A kind of preparation method of cotton fiber matrix activated carbon |
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