CN1753115A - Preparation method of layered cobalt aluminium bihydroxy composite metal oxide electrode material - Google Patents
Preparation method of layered cobalt aluminium bihydroxy composite metal oxide electrode material Download PDFInfo
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- CN1753115A CN1753115A CNA2004100779464A CN200410077946A CN1753115A CN 1753115 A CN1753115 A CN 1753115A CN A2004100779464 A CNA2004100779464 A CN A2004100779464A CN 200410077946 A CN200410077946 A CN 200410077946A CN 1753115 A CN1753115 A CN 1753115A
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- 239000007772 electrode material Substances 0.000 title claims abstract description 16
- 229910044991 metal oxide Inorganic materials 0.000 title claims abstract description 12
- 150000004706 metal oxides Chemical class 0.000 title claims abstract description 12
- 239000002131 composite material Substances 0.000 title claims abstract description 11
- 239000010941 cobalt Substances 0.000 title claims description 19
- 229910017052 cobalt Inorganic materials 0.000 title claims description 19
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 title claims description 19
- 229910052782 aluminium Inorganic materials 0.000 title claims description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 17
- 239000004411 aluminium Substances 0.000 title claims description 13
- 238000002360 preparation method Methods 0.000 title claims description 13
- 238000002425 crystallisation Methods 0.000 claims abstract description 16
- 230000008025 crystallization Effects 0.000 claims abstract description 16
- 239000012266 salt solution Substances 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims description 22
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 16
- 239000008367 deionised water Substances 0.000 claims description 15
- 229910021641 deionized water Inorganic materials 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 14
- 239000000243 solution Substances 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 6
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 239000011734 sodium Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000010792 warming Methods 0.000 claims description 5
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical group [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 4
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical group [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 4
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- 159000000013 aluminium salts Chemical class 0.000 claims description 3
- 229910000329 aluminium sulfate Inorganic materials 0.000 claims description 3
- 150000001868 cobalt Chemical class 0.000 claims description 3
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical group [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 claims description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 2
- 239000012670 alkaline solution Substances 0.000 claims description 2
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 2
- 239000001099 ammonium carbonate Substances 0.000 claims description 2
- 235000012501 ammonium carbonate Nutrition 0.000 claims description 2
- -1 carbonic acid hydrogen salt Chemical class 0.000 claims description 2
- GVPFVAHMJGGAJG-UHFFFAOYSA-L cobalt dichloride Chemical compound [Cl-].[Cl-].[Co+2] GVPFVAHMJGGAJG-UHFFFAOYSA-L 0.000 claims description 2
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 claims description 2
- 229910001981 cobalt nitrate Inorganic materials 0.000 claims description 2
- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical compound [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 claims description 2
- 229910021645 metal ion Inorganic materials 0.000 claims description 2
- 229940072033 potash Drugs 0.000 claims description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 2
- 235000015320 potassium carbonate Nutrition 0.000 claims description 2
- 239000013049 sediment Substances 0.000 claims description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims 1
- 239000001257 hydrogen Substances 0.000 claims 1
- 239000003990 capacitor Substances 0.000 abstract description 10
- 239000013078 crystal Substances 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000000975 co-precipitation Methods 0.000 abstract description 2
- 229910020639 Co-Al Inorganic materials 0.000 abstract 1
- 229910020675 Co—Al Inorganic materials 0.000 abstract 1
- 239000003637 basic solution Substances 0.000 abstract 1
- 239000011259 mixed solution Substances 0.000 abstract 1
- 238000010899 nucleation Methods 0.000 abstract 1
- 230000006911 nucleation Effects 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 14
- 239000002245 particle Substances 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 5
- 229910001925 ruthenium oxide Inorganic materials 0.000 description 5
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 description 5
- 238000001354 calcination Methods 0.000 description 4
- 230000005518 electrochemistry Effects 0.000 description 4
- 238000002173 high-resolution transmission electron microscopy Methods 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 238000010335 hydrothermal treatment Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000002484 cyclic voltammetry Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 229910000428 cobalt oxide Inorganic materials 0.000 description 1
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000011263 electroactive material Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910000480 nickel oxide Inorganic materials 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 238000000634 powder X-ray diffraction Methods 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 229910052707 ruthenium Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004098 selected area electron diffraction Methods 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
-
- 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
- H01G11/46—Metal oxides
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
Abstract
The invention relates to a method for preparing a sandwich Co-Al-hydroxide composite metal oxide (Co-Al-LDH) electrode material of super capacitor, belonging to the technical field of preparing the electrode material of super capacitor. The invention uses an all-returning mixed solution film reactor to make coprecipitation reaction on Co-Al mixed salt solution and basic solution, making nucleation/crystallization separation, controlling the nucleating and growing conditions of the crystal, respectively, then baking at a certain temperature, and fully exposing the electrochemical active situ of the Co on the basis of keeping the sandwich of Co-Al-LDH. The prepared Co-Al-LDH has the advantages of high specific capacitance, good multiplication property, and excellent electrochemical circulating performance.
Description
Technical field
The present invention relates to a kind of preparation method of layer structure cobalt aluminium bihydroxy composite metal oxide super capacitor electrode material, belong to the electrode material for super capacitor preparing technical field.
Background technology
Ultracapacitor has the high and big advantage of conventional physics (or electrolysis) capacitor power density of secondary cell energy density concurrently, have characteristics such as environmentally friendly, that operating temperature range is wide, have extended cycle life in addition, be a kind of extremely promising novel energy-storing device, have broad prospect of application at aspects such as electric motor car, mobile communication, Aero-Space, science and techniques of defence and new energy developments.Therefore electrode material is the important component part of ultracapacitor, is the key factor that influences ultracapacitor performance and production cost, researchs and develops high-performance, low-cost electrode material is the important content of ultracapacitor research and development.
The absorbent charcoal material stable performance, low price, in all commercialization of Japan, the U.S., Russia and China, but the carbon material electrode internal resistance is bigger, is not suitable for working under big electric current, and more on the low side than electric capacity in addition, the single electrode quality is more general at 100～300Fg than electric capacity
-1(this quality does not comprise barrier film, electrolyte and collector quality).
Metal oxide containing precious metals (ruthenium-oxide) has that (nanocrystalline ruthenium-oxide single electrode quality is 380F/g than electric capacity than electric capacity height, amorphous hydrated ruthenium-oxide is up to 760F/g), conductivity big (than big two orders of magnitude of material with carbon element) and advantage such as stable in electrolyte, be the best electrode material for super capacitor of present performance, the U.S. has been applied to key areas such as Aero-Space, military affairs.But the ruthenium resource-constrained, cost an arm and a leg, can't popularization and application.Therefore seek aboundresources, cheap, focus that electrode material function admirable becomes the ultracapacitor research field, there are some researches show, manganese oxide, cobalt oxide, nickel oxide etc. have and the similar chemical property of ruthenium-oxide, are expected to become the substitution material of ruthenium-oxide based super capacitor.
At document (1) Journal of the Electrochemical Society, 1998,145 (12): in 4097, people such as Chuan Lin adopt colloidal sol-gel method to prepare Co (OH)
2Xerogel, the CoO that obtains 150 ℃ of calcination process
xThe highest single electrode be 291Fg than electric capacity
-1But this preparation method's complexity, and the ratio electric capacity of product is on the low side, and active material also is underutilized.
At document (2) power technology, 2003,27 (3): in 315, people such as Liu Xianming consider the chemical property that utilizes doped with Al to improve electroactive material, adopt chemical coprecipitation method to prepare the cobalt aluminium double-hydroxide Co of layer structure
0.67Al
0.33(CO
3)
0.165(OH)
2NH
2O, the single electrode quality reaches 400Fg than electric capacity
-1, but the crystal formation of the sample that the method is prepared is good inadequately, and intergranular agglomeration is serious.
In order to improve the crystallization degree of cobalt aluminium double-hydroxide, in document (3) applied chemistry, 2003,20 (6): in 524, people such as Liu Xianming with the sample that synthesizes in the document (2) at 130 ℃ of hydrothermal treatment consists 16h, XRD spectra shows that the crystal formation of the sample after the hydrothermal treatment consists obviously improves, but single electrode only improves 15% than electric capacity after the hydrothermal treatment consists, reaches 460Fg
-1
Summary of the invention
The preparation method who the purpose of this invention is to provide a kind of layer structure cobalt aluminium bihydroxy composite metal oxide (Co-Al-LDH) electrode material for super capacitor.
The present invention utilizes the full back-mixing liquid film reactor of the device of patent ZL00132145.5, the cobalt aluminium bihydroxy composite metal oxide stratified material of preparation nano-scale, uniform particle diameter, good dispersion, carry out roasting then at a certain temperature, on the basis that keeps cobalt aluminium bihydroxy composite metal oxide layer structure, the electrochemical site of cobalt is fully exposed, thus obtain nanoscale evenly disperse, than electric capacity height, multiplying power property is good, the electrochemistry cycle performance is good layer structure cobalt aluminium bihydroxy composite metal oxide super capacitor electrode material.
Concrete steps of the present invention are as follows:
A is that 1～5 ratio is dissolved in preparation mixing salt solution A in the deionized water with solubility divalent cobalt and aluminum soluble salt in molar ratio, and concentration of metal ions is 0.5～2.0molL in the mixing salt solution
-1
B adds preparation alkaline solution B in the deionized water with soluble carbon hydrochlorate or bicarbonate with NaOH or ammoniacal liquor, make aqueous slkali B identical with the solution A volume, wherein the mol ratio of cobalt salt is 1～4 in the amount of NaOH or ammoniacal liquor and the solution A, and the mol ratio of aluminium salt is 0.5～3 in the amount of carbonate or bicarbonate and the solution A;
C joins mixing salt solution A and aqueous slkali B while constant speed in the full back-mixing liquid film reactor respectively, after disperseing, fully mixes with the place, slit between the stator liquid distribution trough at rotor, discharge through discharging opening, control rotor speed is 1000～6000rmp, and reaction temperature is 15～35 ℃, and the time of staying of material in reactor is 1～5min, put into crystallizing kettle then, carry out crystallization under stirring, crystallization temperature is controlled at 30～90 ℃, crystallization time 5～20h.
The sediment of D after with crystallization leaches, with deionized water repeatedly wash to the pH value less than 8, then at 60～80 ℃ of vacuumize 5～10h.
E with step D dried matter with 1～5 ℃ of min
-1Speed be warming up to 140～200 ℃, constant temperature 2～10h cools to room temperature then with the furnace, obtains product of the present invention.
The described solubility divalent cobalt of steps A is cobalt nitrate Co (NO
3)
2, cobalt chloride CoCl
2Or cobaltous sulfate CoSO
4In any one, aluminum soluble salt is aluminum nitrate Al (NO
3)
3, aluminium chloride AlCl
3Or aluminum sulfate Al
2(SO
4)
3In any one.
Described soluble carbon hydrochlorate of step B or bicarbonate are sodium carbonate Na
2CO
3, sodium acid carbonate NaHCO
3, potash K
2CO
3, saleratus KHCO
3, ammonium carbonate (NH
4)
2CO
3, carbonic hydroammonium NH
4HCO
3In any.
The design feature of the full back-mixing liquid film reactor that step C adopts is, by one the sealing casing as stator, one rotatable cone-shaped rotor is arranged in the stator, the tapering of rotor is 50～70 degree, the inner chamber of stator is identical with the rotor tapering cone-shaped, the outer surface of rotor and inner surface of stator have groove respectively, the groove of stator inner surface is shape in the shape of a spiral, the groove of rotor outer surface and the groove shapes of stator, number is identical, but be rightabout helical form, the groove width of groove is 1～5: 1 with the groove depth ratio, and the number of supratrochlear depression groove is 2～3: 1 with the ratio of the cms of the maximum gauge of rotor; The long-pending little end of rotor cross-section has liquid distribution trough, stator is provided with material inlet and discharging opening, charging aperture is positioned at the long-pending little end of rotor cross-section, discharging opening is positioned at the long-pending big end of rotor cross-section, leaves the slit that can regulate size between stator inner surface and the rotor outer surface.
Adopt day island proper Tianjin ICPS-7500 type inductive coupling plasma emission spectrograph (ICP) to measure the content of cobalt and aluminium in the product, different according to cobalt salt and aluminium salt inventory, the mol ratio of Co/Al is 2～4 in the product; Day island proper Tianjin XRD-6000 type x-ray powder diffraction instrument (XRD) (CuK
αRadiation, λ=1.5406 ) characterize product structure, belong to hexagonal crystal system, have layer structure, 003,006 and 009 3 feature peak height of Co-Al-LDH and sharp-pointed shows that product has higher degree of crystallinity; The surface topography and the particle diameter of NEC JEM-2010 high-resolution-ration transmission electric-lens (HRTEM) observation sample, the product particle diameter is 30～60nm, and uniform particle diameter, good dispersion.
The electrode material Co-Al-LDH of the present invention preparation and commercially available acetylene black conductive agent and the polytetrafluoroethylene binding agent mass fraction by 70: 20: 10 is mixed, the thickness of compressing tablet to 100 μ m, change and be pressed onto on the foaming nickel collector as work electrode, the Hg/HgO electrode is a reference electrode, the large tracts of land platinum filament is an auxiliary electrode, 6molL
-1The KOH aqueous solution be that electrolyte is assembled into three electrode test systems.Utilize the German ZAHNER IM6e of company electrochemical workstation to carry out the cyclic voltammetric test, the electric potential scanning scope is-0.15～0.60V (vs.Hg/HgO), sweep speed 1mVs
-1Adopt the blue electric BTI1-10 type cell tester in Wuhan to carry out the constant current charge-discharge test, the charging/discharging voltage scope is-0.15～0.5V (vs.Hg/HgO), and current density is 60～500mAg
-1The quality of product of the present invention than electric capacity all at 600Fg
-1More than, be higher than the bibliographical information value, and have good multiplying power property and electrochemistry cycle performance.
Remarkable result of the present invention is: the layer structure cobalt aluminium bihydroxy composite metal oxide super capacitor electrode material that the electrochemical site that adopts method provided by the invention can prepare nano-scale, uniform particle diameter, good dispersion and cobalt can fully expose, and this material has than electric capacity height, multiplying power property is good, the electrochemistry cycle performance is good advantage.
Description of drawings
The X-ray diffraction spectrogram of the Co-Al-LDH of Fig. 1 .Co/Al=2
The high-resolution-ration transmission electric-lens of the Co-Al-LDH of Fig. 2 .Co/Al=2 and selected area electron diffraction photo
The cyclic voltammetry curve of the Co-Al-LDH of Fig. 3 .160 ℃ of roasting Co/Al=2
The charging and discharging curve of Co-Al-LDH under different current densities of Fig. 4 .160 ℃ of roasting Co/Al=2
Embodiment
Embodiment 1:
Get the Co (NO of 0.10mol
3)
2Al (NO with 0.05mol
3)
3Be dissolved in the deionized water of 150ml and be made into mixing salt solution, get the NaOH of 0.20mol and the Na of 0.10mol
2CO
3Be dissolved in proportionaling alkali-forming solution in the deionized water of 150ml; With mixing salt solution and aqueous slkali respectively simultaneously constant speed join in the full back-mixing liquid film reactor, after disperseing, fully mixes with the place, slit between the stator liquid distribution trough at rotor, discharge by discharging opening, control rotor speed is 4000rmp, reaction temperature is 25 ℃, and the time of staying of material in reactor is 2min; The slurries that full back-mixing liquid film reactor is discharged are put into round-bottomed flask, under 80 ℃ water-bath, stir crystallization 10h; Material after the crystallization is repeatedly washed, filters with deionized water, to the pH value less than 8, then at 80 ℃ of vacuumize 5h; With dried matter with 2 ℃ of min
-1Speed be warming up to 160 ℃ of constant temperature calcining 5h, cool to room temperature then with the furnace, obtain product of the present invention.The molar ratio of Co/Al is 2 in the ICP test shows product; XRD test shows product has good crystal formation, belongs to hexagonal crystal system, the obvious (see figure 1) of layer structure feature of LDH; HRTEM test shows product particle diameter is in 30～50nm scope, and the favorable dispersibility (see figure 2); The cyclic voltammetry curve of electrochemistry cyclic voltammetric test shows product is approaching square, the obvious (see figure 3) of electrochemical capacitance characteristic; 60～480mAg
-1Charge-discharge test under the current density show product quality than electric capacity all at 680Fg
-1More than, the good (see figure 4) of product multiplying power property, the 100 all backs capacity that discharge and recharge do not have obvious decay.
Embodiment 2:
Get the CoSO of 0.20mol
4Al with 0.025mol
2(SO
4)
3Be dissolved in the deionized water of 150ml and be made into mixing salt solution, get the NaOH of 0.20mol and the Na of 0.10mol
2CO
3Be dissolved in proportionaling alkali-forming solution in the deionized water of 150ml; With mixing salt solution and aqueous slkali respectively simultaneously constant speed join in the full back-mixing liquid film reactor, after disperseing, fully mixes with the place, slit between the stator liquid distribution trough at rotor, discharge by discharging opening, control rotor speed is 3500rmp, reaction temperature is 35 ℃, and the time of staying of material in reactor is 1min; The slurries that full back-mixing liquid film reactor is discharged are put into round-bottomed flask, under 65 ℃ water-bath, stir crystallization 15h; Material after the crystallization is repeatedly washed, filters with deionized water, to the pH value less than 8, then at 70 ℃ of vacuumize 5h; With dried matter with 2 ℃ of min
-1Speed be warming up to 200 ℃ of constant temperature calcining 5h, cool to room temperature then with the furnace, obtain product of the present invention.The mol ratio of Co/Al is 4 in the ICP test shows product; XRD test shows product has good crystal formation, belongs to hexagonal crystal system, and the layer structure feature of LDH is obvious; HRTEM test shows product particle diameter is in 30～50nm scope, and favorable dispersibility; 100mAg
-1Quality under the current density than electric capacity at 610Fg
-1More than, the 100 all backs capacity that discharge and recharge do not have obvious decay.
Embodiment 3:
Get the CoCl of 0.15mol
2AlCl with 0.05mol
3Be dissolved in the deionized water of 150ml and be made into mixing salt solution, get the NaOH of 0.15mol and the Na of 0.10mol
2CO
3Be dissolved in proportionaling alkali-forming solution in the deionized water of 150ml; With mixing salt solution and aqueous slkali respectively simultaneously constant speed join in the full back-mixing liquid film reactor, after disperseing, fully mixes with the place, slit between the stator liquid distribution trough at rotor, discharge by discharging opening, control rotor speed is 5000rmp, reaction temperature is 25 ℃, and the time of staying of material in reactor is 3min; The slurries that full back-mixing liquid film reactor is discharged are put into round-bottomed flask, under 70 ℃ water-bath, stir crystallization 15h; Material after the crystallization is repeatedly washed, filters with deionized water, to the pH value less than 8, then at 80 ℃ of vacuumize 10h; With dried matter with 5 ℃ of min
-1Speed be warming up to 160 ℃ of constant temperature calcining 5h, cool to room temperature then with the furnace, obtain product of the present invention.The molar ratio of Co/Al is 3 in the ICP test shows product; XRD test shows product has good crystal formation, belongs to hexagonal crystal system, and the layer structure feature of LDH is obvious; HRTEM test shows product particle diameter is in 30～50nm scope, and favorable dispersibility; 80mAg
-1Quality under the current density than electric capacity at 650Fg
-1More than, the 100 all backs capacity that discharge and recharge do not have obvious decay.
Claims (2)
1. the preparation method of a layered cobalt aluminium bihydroxy composite metal oxide electrode material, concrete steps are as follows:
A is that 1～5 ratio is dissolved in preparation mixing salt solution A in the deionized water with solubility divalent cobalt and aluminum soluble salt in molar ratio, and concentration of metal ions is 0.5～2.0molL in the mixing salt solution
-1
B adds preparation alkaline solution B in the deionized water with soluble carbon hydrochlorate or bicarbonate with NaOH or ammoniacal liquor, make solution B identical with the solution A volume, wherein the mol ratio of cobalt salt is 1～4 in the amount of NaOH or ammoniacal liquor and the solution A, and the mol ratio of aluminium salt is 0.5～3 in the amount of carbonate or bicarbonate and the solution A;
C joins mixing salt solution A and aqueous slkali B while constant speed in the full back-mixing liquid film reactor respectively, after disperseing, fully mixes with the place, slit between the stator liquid distribution trough at rotor, discharge through discharging opening, control rotor speed is 1000～6000rmp, and reaction temperature is 15～35 ℃, and the time of staying of material in reactor is 1～5min, put into crystallizing kettle then, carry out crystallization under stirring, crystallization temperature is controlled at 30～90 ℃, and crystallization time is 5～20h;
The sediment of D after with crystallization leaches, with deionized water repeatedly wash to the pH value less than 8, then at 60～80 ℃ of vacuumize 5～10h;
E with step D dried matter with 1～5 ℃ of min
-1Speed be warming up to 140～200 ℃, constant temperature 2～10h cools to room temperature then with the furnace, obtains product of the present invention.
2. the preparation method of the described layered cobalt aluminium bihydroxy composite metal oxide electrode material of claim 1 is characterized in that:
The described solubility divalent cobalt of steps A is cobalt nitrate Co (NO
3)
2, cobalt chloride CoCl
2Or cobaltous sulfate CoSO
4In any one; Aluminum soluble salt is aluminum nitrate Al (NO
3)
3, aluminium chloride AlCl
3Or aluminum sulfate Al
2(SO
4)
3In any one;
The described soluble carbon hydrochlorate of step B is sodium carbonate Na
2CO
3, potash K
2CO
3, ammonium carbonate (NH
4)
2CO
3, solubility carbonic acid hydrogen salt is sodium acid carbonate NaHCO
3, saleratus KHCO
3, carbonic hydroammonium NH
4HCO
3In any.
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| PCT/CN2005/001227 WO2006032183A1 (en) | 2004-09-21 | 2005-08-10 | A METHOD OF MANUFACTURING A LAYERED CoAl DOUBLE HYDROXIDE COMPOSITE METAL OXIDES ELECTRODE MATERIALS |
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| CNB2004100779464A CN100485836C (en) | 2004-09-21 | 2004-09-21 | Preparation method of layered cobalt aluminium bihydroxy composite metal oxide electrode material |
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