CN107680826A - A kind of preparation method of layering porous active carbon electrode material for ultracapacitor - Google Patents
A kind of preparation method of layering porous active carbon electrode material for ultracapacitor Download PDFInfo
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- CN107680826A CN107680826A CN201711112997.XA CN201711112997A CN107680826A CN 107680826 A CN107680826 A CN 107680826A CN 201711112997 A CN201711112997 A CN 201711112997A CN 107680826 A CN107680826 A CN 107680826A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 239000007772 electrode material Substances 0.000 title claims abstract description 28
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000001035 drying Methods 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 239000008367 deionised water Substances 0.000 claims abstract description 9
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 9
- 239000012299 nitrogen atmosphere Substances 0.000 claims abstract description 9
- 238000002604 ultrasonography Methods 0.000 claims abstract description 3
- 238000001994 activation Methods 0.000 claims description 20
- 230000004913 activation Effects 0.000 claims description 19
- 238000003763 carbonization Methods 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- 238000010792 warming Methods 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 210000000936 intestine Anatomy 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000003610 charcoal Substances 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 10
- 239000002250 absorbent Substances 0.000 abstract description 6
- 230000002745 absorbent Effects 0.000 abstract description 6
- 238000009826 distribution Methods 0.000 abstract description 6
- 239000003990 capacitor Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 239000003575 carbonaceous material Substances 0.000 description 18
- 239000000047 product Substances 0.000 description 14
- 238000004458 analytical method Methods 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 239000003513 alkali Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 239000010431 corundum Substances 0.000 description 2
- 238000002484 cyclic voltammetry Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000006068 polycondensation reaction Methods 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 238000009656 pre-carbonization Methods 0.000 description 2
- 239000003755 preservative agent Substances 0.000 description 2
- 230000002335 preservative effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000010408 sweeping Methods 0.000 description 2
- LLYXJBROWQDVMI-UHFFFAOYSA-N 2-chloro-4-nitrotoluene Chemical compound CC1=CC=C([N+]([O-])=O)C=C1Cl LLYXJBROWQDVMI-UHFFFAOYSA-N 0.000 description 1
- 239000004966 Carbon aerogel Substances 0.000 description 1
- 206010037211 Psychomotor hyperactivity Diseases 0.000 description 1
- 206010052428 Wound Diseases 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 125000005842 heteroatom Chemical group 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 1
- 229910001950 potassium oxide Inorganic materials 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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
- H01G11/22—Electrodes
- H01G11/30—Electrodes characterised by their material
- H01G11/32—Carbon-based
-
- 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
- H01G11/26—Electrodes characterised by their structure, e.g. multi-layered, porosity or surface features
-
- 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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
Abstract
A kind of preparation method of layering porous active carbon electrode material for ultracapacitor, is related to electrode material for super capacitor technical field.Mixed after casing is carbonized with KOH and deionized water under ultrasound condition, obtain mixture after drying, then mixture is activated in nitrogen atmosphere, it is last ground, obtain the layering porous active carbon electrode material for ultracapacitor.It is casing abundance, renewable, environment-friendly, there is hierarchy, flourishing specific surface area and rational pore-size distribution by absorbent charcoal material made from simple handling process, there is preferable capacitive property in ultracapacitor as electrode material.Preparation process of the present invention is simple to operation, significant to the production cost of reduction ultracapacitor high surface activity carbon.
Description
Technical field
The present invention relates to electrode material for super capacitor technical field.
Background technology
With global energy crisis and the aggravation of environmental pollution, sustainable new energy and advanced energy storage technology gesture are developed must
OK.Ultracapacitor is a kind of new electrochemical energy storing device, and compared to traditional capacitor, ultracapacitor has bigger
The energy density of specific capacity and Geng Gao；Compared with rechargeable battery, ultracapacitor has higher power density and longer followed
The ring life-span, at the same also have can high current fast charging and discharging the advantages of.Make ultracapacitor in electronic equipment, electric automobile, aviation
The numerous areas such as space flight have broad application prospects.
Activated carbon is because having higher specific surface area and porosity, and relative to CNT, graphene, carbon aerogels etc.
With it is cheap, can mass produce the advantages of and as ultracapacitor preferred electrode material.Activated carbon conduct at present
The ultracapacitor of electrode material has been carried out commercialization, and is widely used in numerous areas.But traditional work
Charcoal is based on micropore and structure is single for property, is unfavorable for it and promotes the use of.
Layering porous charcoal contains abundant micropore and mesopore, and rational pore-size distribution is advantageous to electrolyte ion porous logical
Transmitted in road, hierarchy can effectively alleviate charge and discharge process because expansion and caused by electrode material avalanche, thus be layered
Porous charcoal is highly suitable as electrode material for super capacitor use, and shows preferable chemical property.
The content of the invention
The defects of for above prior art, present invention aims at providing, a kind of layering for ultracapacitor is porous
The preparation method of carbon electrode material.
The technical scheme is that：Mixed after casing is carbonized with KOH and deionized water under ultrasound condition, after drying
Mixture is obtained, then mixture is activated in nitrogen atmosphere, it is last ground, obtain the layering for ultracapacitor
Porous active carbon electrode material.
In carbonisation with the rise of temperature physics, the chemical change of a series of complex, physical change master occur for casing
If dehydration, degassing and drying process, chemical change mainly thermally decomposes and the reaction of the class of thermal polycondensation two.Casing after carbonization, goes
Volatile matter in casing, moisture etc. are removed, increases carbon content, preliminarily forms the carbon structure of hole, for follow-up KOH activation wounds
Make condition.Present invention KOH soda-dips carbonization casing, makes holes of the activator KOH well into carbonization casing, is follow-up high
Warm KOH uniform activation creates conditions.
Using the obtained high-specific surface area layering porous active carbon electrode material of the present invention, casing can be made full use of, and intestines
Clothing belongs to renewable biomass, realizes casing high-efficiency resource recycling, while to improving ultracapacitor capacitive character energy, reducing
Activated Carbon Production cost is significant.
Compared with prior art, the beneficial effects of the present invention are：
1）The hierarchy of casing itself is advantageous to the porous carbon materials that a step prepares hierarchy, so as to improve the electricity of Carbon Materials
Capacitive energy.
2）Casing is mainly made up of fat and protein, rich in elements such as C, N, O, can directly be prepared rich in N, O function
The heteroatom functional such as activated carbon, N, O group of group can provide extra fake capacitance, so as to further improve the capacitive character of activated carbon
Energy.
3）Casing is its abundance, renewable, environment-friendly as biomass, by made from simple handling process
Absorbent charcoal material has hierarchy, flourishing specific surface area and rational pore-size distribution, as electrode material in super capacitor
There is preferable capacitive property in device.
4）Preparation process of the present invention is simple to operation, has to the production cost for reducing ultracapacitor high surface activity carbon
It is significant.
Further, carbonization of the present invention is in nitrogen atmosphere, and 500 are warming up to 1~5 DEG C/min heating rate
~800 DEG C, the h of constant temperature carbonization treatment 2~5 is carried out to casing.Proved through repetition test, as temperature be less than 500 DEG C, casing carbonization
Not thorough, impurity content height；And higher than 800 DEG C, yield poorly, high energy consumption.During suitable heating rate, material is heated in low-temperature space
Time is grown, and the selectivity of pyrolytic reaction is stronger, and initial stage, pyrolysis disconnected key weaker in casing molecule, and there occurs parallel and suitable
The thermal polycondensation reaction of sequence, advantageously forms the structure with high thermal stability, obtains higher solid charing products collection efficiency.Rise
Warm speed is too high, casing is separated out more macromoleculars, reduces carbide yield.Heating rate is too low, and carbonization time is long, charcoal
The increase of compound burn tinctuer.
During the activation, 700~900 DEG C are warming up to 5~10 DEG C/min heating rate, carries out constant temperature activation 2~4
h.As activation temperature be less than 700 DEG C, pore-creating DeGrain；And such as activation temperature is higher than 900 DEG C, there is overactivation phenomenon, intestines
The original hierarchy of clothing can be destroyed because of high temperature, cause yield and hydraulic performance decline.Suitable heating rate is advantageous to herein
Uniform activation, stable activation process can be effectively protected the original hierarchy of casing；Soak time is long, can cause
KOH overactivities, burn tinctuer is too high, and product yield is too low.
The mixing quality ratio of the casing and KOH is 1: 2~5 after carbonization.The present invention can be coated fully using excessive KOH
It is more efficient in casing carbon surface, pore-creating.But excessive KOH, active rate can be accelerated, cause overactivation phenomenon to occur, make
Obtain the pore structure generated to be destroyed, specific surface area and pore volume reduce, and reduce the capacitive property of product.It is meanwhile excessive
KOH can aggravate the corrosion of equipment.
The product elder generation watery hydrochloric acid cleaning that will be obtained after activation, then be washed with deionized water to neutrality, then it is dried, finally
It is ground.The activation products such as the potassium carbonate being present in activation products hole, potassium oxide can be removed by being cleaned with watery hydrochloric acid, be made
The hole of activated carbon is exposed, so that activated carbon has flourishing specific surface area, improves its capacitive property.
The casing for carbonization is obtained after soaking the h of casing 5~10, then cleaned, drying with 60~90 DEG C of warm water.Using
The warm water immersion of the temperature can expand the hierarchy of casing；The purpose of warm water cleaning：Casing surface impurity is removed, is avoided
Influence follow-up activation and capacitive property.
Brief description of the drawings
Fig. 1 is that the SEM of the casing of embodiment 1 schemes.
Fig. 2 is the SEM figures of pre- carbonization casing charcoal prepared by embodiment 1.
Fig. 3 is the SEM figures of porous active Carbon Materials prepared by embodiment 1.
Fig. 4 is the DFT graph of pore diameter distribution of porous active Carbon Materials prepared by embodiment 2.
Fig. 5 is the electron spectrum fitted figure of the full spectral element of XPS analysis of porous active Carbon Materials prepared by embodiment 1.
Fig. 6 is the electron spectrum fitted figure of the XPS analysis N1s elements of porous active Carbon Materials prepared by embodiment 1.
Fig. 7 is the cycle charge-discharge curve map of porous active Carbon Materials prepared by embodiment 1.
Fig. 8 is the cyclic voltammetry curve figure of porous active Carbon Materials prepared by embodiment 1.
Fig. 9 is the specific capacitance of activated carbon electrodes prepared by Examples 1 and 2 with the variation diagram of discharge current density.
Figure 10 is the specific capacitance of activated carbon electrodes prepared by Examples 1 and 2 with the variation diagram of cycle-index.
Embodiment
First, preparation technology：
Embodiment 1：
1）The carbonization treatment of casing：Casing 10h is soaked with 60 DEG C of warm water, cleaning, weighs 10g casing after drying, can by Fig. 1
See, casing has obvious hierarchy.
Casing arrangement tiling is deposited in corundum boat, moves into tube furnace under nitrogen atmosphere, with 1 DEG C/min heating speed
Rate is warming up to 500 DEG C, constant temperature carbonization 5h, the casing Carbon Materials being layered.
With the SEM figures of the casing Carbon Materials of higher slice as shown in Figure 2, as seen from Figure 2：Pre- carbonization enteric materials are irregular
Block and have obvious hierarchy, bulk sample surface is opposed flattened, without obvious hole and duct.
2）Weigh 12g potassium hydroxide to be dissolved in appropriate deionized water, form alkali lye.
3g casing Carbon Materials are weighed to add in alkali lye, after being stirred with glass bar, ultrasonic 30min, after preservative film sealing,
5h is impregnated at room temperature, is then dried in an oven, obtains mixture.
3）Mixture is moved in nickel crucible, moves into tube furnace under nitrogen atmosphere, is heated up with 5 DEG C/min heating rate
To 750 DEG C, constant temperature activation 4h, activation products are obtained.
4）The first activation products made from 0.5M watery hydrochloric acid washs, then it is 6~7 to be washed with deionized water to the pH value of filtrate,
Ground after drying, obtain ultracapacitor layering porous active carbon electrode material.
With the SEM figures of higher slice porous activated carbon electrode material as shown in Figure 3, as seen from Figure 3：Casing be carbonized at high temperature
Etched to form substantial amounts of hole and duct by KOH.
Fig. 5 is the electron spectrum fitted figure of the full spectral element of XPS analysis of porous active Carbon Materials prepared by embodiment 1.By
Fig. 5 is visible：Obtained absorbent charcoal material is mainly made up of C, N, O element.
Fig. 6 is the electron spectrum fitted figure of the XPS analysis N1s elements of porous active Carbon Materials prepared by embodiment 1.
As seen from Figure 6：N 1s spectral peaks are divided into four peaks, illustrate that abundant nitrogenous function is contained on absorbent charcoal material surface
Group, their surface-active can provide abundant fake capacitance, so as to strengthen the capacitive property of absorbent charcoal material.
Embodiment 2：
1）The carbonization treatment of casing：Casing 5h is soaked with 90 DEG C of warm water, cleaning, 10g casing is weighed after drying, arranges tiling heap
It is placed in corundum boat, moves into tube furnace under nitrogen atmosphere, is warming up to 800 DEG C with 5 DEG C/min heating rate, constant temperature carbonization
2h, the casing Carbon Materials being layered.
2）Weigh 15g potassium hydroxide to be dissolved in appropriate deionized water, form alkali lye.
3g casing Carbon Materials are weighed to add in alkali lye, after being stirred with glass bar, ultrasonic 30min, after preservative film sealing,
5h is impregnated at room temperature, is then dried in an oven, obtains mixture.
3）Mixture is moved in nickel crucible, moves into tube furnace under nitrogen atmosphere, with 10 DEG C/min heating rate liter
Temperature constant temperature activation 2h, obtains activation products to 900 DEG C.
4）The first activation products made from 0.5M watery hydrochloric acid washs, then it is 6~7 to be washed with deionized water to the pH value of filtrate,
After drying ultracapacitor layering porous active carbon electrode material is obtained through grinding.
With the DFT graph of pore diameter distribution of higher slice porous activated carbon electrode material as shown in Figure 4, as seen from Figure 4：Obtained work
Property Carbon Materials there is abundant microcellular structure, and aperture is concentrated mainly on 1.5nm or so.
2nd, apply：
Take respectively and the progress parallel test of porous active carbon electrode material is layered made from the above two：
Layering porous active carbon electrode material and conductive agent, binding agent are prepared by mixing into electrode slice with 85: 10: 5 mass ratio,
Three electric grade electrochemical property tests are carried out in 6M KOH electrolyte.
Fig. 7 is the cycle charge-discharge curve map of porous active Carbon Materials prepared by embodiment 1.
As seen from Figure 7：The GCD curves of institute's test sample product show the isosceles three of slight deformation under different current densities
It is angular, illustrate that electrode material has good electric double layer capacitance characteristic, because the redox reaction of surface functional group produces slightly
Deformation, illustrate that obtained activated carbon has preferable capacitive property and high rate performance.
Fig. 8 is the cyclic voltammetry curve figure of porous active Carbon Materials prepared by embodiment 1.
As seen from Figure 8：The CV curves of institute's test sample product show class rectangle, illustrate the electric capacity of sample mainly by electric double layer capacitance
There is provided.There is not obvious deformation in CV curves in the case where sweeping speed greatly, illustrates that electrode material has preferable capacitive property and quickly
Charge-storage mechanism.
Fig. 9 is the specific capacitance of activated carbon electrodes prepared by Examples 1 and 2 with the variation diagram of discharge current density.
As seen from Figure 9：The current density of institute's test sample product is from 0.5 Ag-1Increase to 20 Ag-1When, remain in that higher
Specific capacitance, illustrate that they have preferable multiplying power property.
Figure 10 is the specific capacitance of activated carbon electrodes prepared by Examples 1 and 2 with the variation diagram of cycle-index.
As seen from Figure 10：Institute's test sample product are 2 Ag in current density-1Still there is higher electric capacity to protect after Shi Xunhuan 5000 times
Holdup, illustrate that they have outstanding cyclical stability.
Followed with being layered electrode slice that porous active carbon electrode material formed made from the method for example 1 in sweeping for 100 mV/s under speed
Ring volt-ampere curve still shows preferable rectangular configuration, and when current density is 1 A/g, specific capacitance reaches 293 F/g；Electric current is close
Spend for 2 A/g when, capability retention reaches 92.9% after 5000 charge and discharge cycles.
To be layered the electrode slice of porous active carbon electrode material formation made from the method for example 2 when current density is 1 A/g
Specific capacitance reaches 256 F/g；When current density is 2 A/g, capability retention reaches 91.1% after 5000 charge and discharge cycles.
The pore structure analysis result of layering porous active carbon electrode material obtained by both examples above is listed in the following table.
As seen from the above table：Obtained absorbent charcoal material has higher specific surface area, rational pore-size distribution, as electricity
Pole material can increase the contact area between electrode and electrolyte liquor, promote electrolyte ion quickly to transmit, so as to improve material
Capacitive property.
Claims (6)
1. the preparation method of a kind of layering porous active carbon electrode material for ultracapacitor, it is characterised in that by casing carbon
Mixed after change with KOH and deionized water under ultrasound condition, obtain mixture after drying, then by mixture in nitrogen atmosphere
Activated, it is last ground, obtain the layering porous active carbon electrode material for ultracapacitor.
2. preparation method according to claim 1, it is characterised in that it is described carbonization be in nitrogen atmosphere, with 1~5 DEG C/
Min heating rate is warming up to 500~800 DEG C, and the h of constant temperature carbonization treatment 2~5 is carried out to casing.
3. preparation method according to claim 1, it is characterised in that during the activation, with 5~10 DEG C/min heating speed
Rate is warming up to 700~900 DEG C, carries out constant temperature and activates 2~4 h.
4. preparation method according to claim 3, it is characterised in that the mixing quality ratio of the casing and KOH is after carbonization
1: 2~5.
5. preparation method according to claim 1, it is characterised in that the product elder generation watery hydrochloric acid cleaning that will be obtained after activation, then
It is washed with deionized water to neutrality, is then dried, is finally ground.
6. according to the preparation method described in claim 1 or 2 or 3 or 4 or 5, it is characterised in that soak intestines with 60~90 DEG C of warm water
The casing for carbonization is obtained after the h of clothing 5~10, then cleaned, drying.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108910880A (en) * | 2018-07-20 | 2018-11-30 | 扬州大学 | Porous laminated absorbent charcoal material and preparation method thereof for supercapacitor |
| CN110902678A (en) * | 2019-11-01 | 2020-03-24 | 宁夏大学 | Method for preparing sulfur-oxygen co-doped porous carbon based on paper |
| CN111453729A (en) * | 2019-08-26 | 2020-07-28 | 山东大学 | Method for preparing super activated carbon with assistance of ultrasonic waves and application of super activated carbon |
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| CN101004977A (en) * | 2006-01-18 | 2007-07-25 | 中国科学院化学研究所 | Active carbon electrode material for super capacitor and its preparing method |
| CN101880037A (en) * | 2009-05-08 | 2010-11-10 | 邹庆立 | Preparation method of porous carbon material |
| CN101993068A (en) * | 2010-10-27 | 2011-03-30 | 北京化工大学 | Preparation method of porous structured active carbon |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111453729A (en) * | 2019-08-26 | 2020-07-28 | 山东大学 | Method for preparing super activated carbon with assistance of ultrasonic waves and application of super activated carbon |
| WO2021036548A1 (en) * | 2019-08-26 | 2021-03-04 | 山东大学 | Method for ultrasonic-assisted preparation of super active carbon and application thereof |
| CN110902678A (en) * | 2019-11-01 | 2020-03-24 | 宁夏大学 | Method for preparing sulfur-oxygen co-doped porous carbon based on paper |
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| CN107680826B (en) | 2019-01-22 |
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