CN105355911A - Preparation method of aluminum oxide coated lithium nickel manganese cobalt cathode material - Google Patents
Preparation method of aluminum oxide coated lithium nickel manganese cobalt cathode material Download PDFInfo
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- CN105355911A CN105355911A CN201510844880.5A CN201510844880A CN105355911A CN 105355911 A CN105355911 A CN 105355911A CN 201510844880 A CN201510844880 A CN 201510844880A CN 105355911 A CN105355911 A CN 105355911A
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- lithium manganate
- cobalt lithium
- sintering
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- nickel
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- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- 239000010406 cathode material Substances 0.000 title claims abstract description 20
- SOXUFMZTHZXOGC-UHFFFAOYSA-N [Li].[Mn].[Co].[Ni] Chemical compound [Li].[Mn].[Co].[Ni] SOXUFMZTHZXOGC-UHFFFAOYSA-N 0.000 title abstract 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 title abstract 3
- 238000005245 sintering Methods 0.000 claims abstract description 81
- 238000000034 method Methods 0.000 claims abstract description 45
- 239000000463 material Substances 0.000 claims abstract description 41
- 238000002156 mixing Methods 0.000 claims abstract description 39
- 239000000203 mixture Substances 0.000 claims abstract description 35
- 229920002635 polyurethane Polymers 0.000 claims abstract description 18
- 239000004814 polyurethane Substances 0.000 claims abstract description 18
- SEVNKUSLDMZOTL-UHFFFAOYSA-H cobalt(2+);manganese(2+);nickel(2+);hexahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mn+2].[Co+2].[Ni+2] SEVNKUSLDMZOTL-UHFFFAOYSA-H 0.000 claims abstract description 12
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims abstract description 12
- 229910052808 lithium carbonate Inorganic materials 0.000 claims abstract description 12
- 239000002243 precursor Substances 0.000 claims abstract description 12
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 11
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 11
- OVAQODDUFGFVPR-UHFFFAOYSA-N lithium cobalt(2+) dioxido(dioxo)manganese Chemical compound [Li+].[Mn](=O)(=O)([O-])[O-].[Co+2] OVAQODDUFGFVPR-UHFFFAOYSA-N 0.000 claims description 54
- 230000008569 process Effects 0.000 claims description 37
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 claims description 31
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 19
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 16
- 235000020985 whole grains Nutrition 0.000 claims description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 229910052760 oxygen Inorganic materials 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 238000000227 grinding Methods 0.000 claims description 9
- 229910021529 ammonia Inorganic materials 0.000 claims description 8
- 238000010298 pulverizing process Methods 0.000 claims description 8
- 239000011343 solid material Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 6
- 238000011068 loading method Methods 0.000 claims description 4
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000011248 coating agent Substances 0.000 abstract description 2
- 238000000576 coating method Methods 0.000 abstract description 2
- 230000001351 cycling effect Effects 0.000 abstract 1
- 230000006641 stabilisation Effects 0.000 abstract 1
- 238000011105 stabilization Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 15
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 9
- 229910052744 lithium Inorganic materials 0.000 description 9
- 229910001416 lithium ion Inorganic materials 0.000 description 7
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 6
- 239000012153 distilled water Substances 0.000 description 6
- 238000001914 filtration Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000010941 cobalt Substances 0.000 description 5
- 229910017052 cobalt Inorganic materials 0.000 description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000010405 anode material Substances 0.000 description 3
- 229910010707 LiFePO 4 Inorganic materials 0.000 description 2
- 229910002097 Lithium manganese(III,IV) oxide Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 150000001768 cations Chemical class 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- SMBQBQBNOXIFSF-UHFFFAOYSA-N dilithium Chemical compound [Li][Li] SMBQBQBNOXIFSF-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000003836 solid-state method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
-
- 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
- Y02E60/10—Energy storage using batteries
Abstract
The invention belongs to the technical field of battery materials, and discloses a preparation method of an aluminum oxide coated lithium nickel manganese cobalt cathode material. The method comprises the steps of raw material mixing, primary sintering, doping, secondary sintering, coating and size stabilization treatment, wherein the step of raw material mixing comprises the steps that a three-dimensional efficient titled mixer is adopted, polyurethane balls serve as a mixing medium, dispersing, even mixing and smashing are conducted on lithium carbonate, a nanometer spherical nickel cobalt manganese hydroxide precursor and polyethylene glycol, and a uniform intermediate mixture is formed. The preparation method of the aluminum oxide coated lithium nickel manganese cobalt cathode material is low in primary sintering temperature, short in sintering time, simple in technology, large in specific capacity and good in cycling performance. The preparation method further has the advantages of being low in investment, reliable in technology, low in operating cost and the like, and the good economic benefit and market promotion value are achieved.
Description
Technical field
The invention belongs to battery material technical field, relate to a kind of preparation method of nickel-cobalt lithium manganate cathode material, particularly relate to a kind of preparation method of alumina-coated nickel-cobalt lithium manganate cathode material.
Background technology
Lithium-ion-power cell is the most potential on-vehicle battery of generally acknowledging both at home and abroad at present, primarily of part compositions such as positive electrode, negative material, barrier film, electrolyte; Wherein, positive electrode is the important component part of lithium ion battery, is also the key factor determining performance of lithium ion battery; Therefore, from the viewpoint of resource, environmental protection and security performance, the ideal electrode active material finding lithium ion battery is still an international energy material supplier author primary difficult problem to be solved.
Current anode material for lithium-ion batteries mainly contains cobalt acid lithium, LiMn2O4, cobalt nickel lithium manganate ternary material, LiFePO 4 etc.Wherein with the cobalt acid lithium lithium ion battery that is positive electrode, there is the features such as lightweight, capacity is large, specific energy is high, operating voltage is high, electric discharge is steady, applicable heavy-current discharge, good cycle, life-span are grown, compact battery has the advantage that cannot replace, and is the maximum anode material for lithium-ion batteries of current production rate.But cobalt acid lithium is expensive, toxicity is comparatively large, and there is certain safety issue.LiMn2O4 cost is low, and fail safe is good, but cycle performance, especially high temperature cyclic performance are poor, and have certain dissolubility in the electrolytic solution, storge quality is poor.LiFePO 4 because the consistency of material is poor, complicated process of preparation hinders its applying on lithium battery, at present also in the concern of people.Therefore, research and development electrical property and the close and low-cost anode material of lithium battery of cobalt acid lithium have become the important directions that lithium battery develops.
Recently, cobalt nickel lithium manganate ternary material is attracted attention day by day, by to the data test of this material property as aspects such as volume and capacity ratio, weight ratio capacity, circulation, safety, show nickel-cobalt lithium manganate material some excellent properties as novel lithium battery positive electrode generally, the advantages such as high in voltage platform, reversible specific capacity is large, Stability Analysis of Structures, security performance are good.Although cobalt nickel lithium manganate ternary material development rapidly, also there are some defects in it in actual applications.As low in coulombic efficiency first, high rate performance and cycle performance is poor, composition and pattern are difficult to control, tap density is low.At present, people improve its coulombic efficiency first mainly through reducing cation mixing, and by increasing electronic conductivity and ionic conductivity improves its high rate performance, by preparing pattern rule, particle that specific area is little increases its tap density.
One of method of synthesis nickle cobalt lithium manganate is high temperature solid-state method, is by lithium source, nickel source, cobalt source, manganese source ground and mixed together, calcining synthesis under about 1000 DEG C of high temperature.But this mode must bring the inhomogeneities of material, thus cause the product after sintering to be difficult to obtain the material without dephasign, such that capacity attenuation is fast, comprehensive electrochemical properties reduction.Another kind method is sol-gal process, but this method dries the difficulty that dewaters, and have impact on its industrialization.
Summary of the invention
Goal of the invention of the present invention is: for above-mentioned Problems existing, provides that a kind of once sintered temperature is low, sintering time is short, technique is simple, specific capacity is large, the preparation method of the alumina-coated nickel-cobalt lithium manganate cathode material of good cycle.
The technical solution used in the present invention is as follows:
A preparation method for alumina-coated nickel-cobalt lithium manganate cathode material, comprises the following steps:
(1) raw material mixing: adopt three dimension high efficiency inclined mixer and with polyurethane ball for batch mixing medium, lithium carbonate, nanometer spherical nickel cobalt manganese hydroxide precursor and polyethylene glycol carried out disperseing, mix and pulverizing, forms uniform intermediate mixture;
(2) once sintered: the intermediate mixture of step (1) gained is loaded saggar, send into pushed bat kiln to sinter, produce nickel-cobalt lithium manganate material, sintering process is continual is filled with oxygen, sintering temperature is 650 ~ 750 DEG C, and sintering time is 2 ~ 7h;
(3) adulterate: select nano level ZnO, MgO, Al
2o
3or TiO
2in one, add in the nickel-cobalt lithium manganate material of step (2) gained with account for total solid material mass 0.1 ~ 0.2%, and to add polyurethane ball be batch mixing medium, carry out batch mixing;
(4) double sintering: the nickle cobalt lithium manganate through overdoping is sent into pushed bat kiln and carries out double sintering, sintering process is continual is filled with air or oxygen;
(5) coated: preparation molar concentration is the Al solion of 0.01 ~ 0.06mol/L, is joined in solution by the nickle cobalt lithium manganate after double sintering and mixes, pass into ammonia spirit, stir, clean, filter, dry, obtain by Al
2o
3coated nickle cobalt lithium manganate material positive electrode.
(6) whole grain process: adopt special arrangement to carry out whole grain process to the nickle cobalt lithium manganate product through coated process, adjustment product is pulverized, value parameter, namely obtains nickle cobalt lithium manganate finished product.
Further, the proportion of the described polyurethane ball of step (1) is >=1.3, and ratio of grinding media to material is 3:4:3, and mixing time is 3 ~ 4h.
Further, the mol ratio of step (1) described lithium carbonate, nanometer spherical nickel cobalt manganese hydroxide precursor is 1:0.53 ~ 0.56, and the mass ratio that polyethylene glycol accounts for total mixture is 10% ~ 40%.
Further, the sintering temperature of step (4) described double sintering is 900 ~ 1000 DEG C, and sintering time is 2 ~ 7h.
Further, the temperature of step (5) described stirring is 75 ~ 80 DEG C, and the time of stirring is 4 ~ 6h.
Further, the described Al solion of step (5) is Al (NO
3)
3, Al
2(SO
4)
3or AlCl
3one in solution.
Further, step (6) described special arrangement is airslide disintegrating mill and grader, and loading frequency controls at 6 ~ 10Hz, and grade frequency controls at 15 ~ 20Hz.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
(1) the present invention take lithium carbonate as lithium source, and once sintered temperature is low, and sintering time is short, has saved the energy; After adopting first low temperature, the heat treating regime of high temperature is conducive to the material obtaining structure improvement simultaneously, is also conducive to the electrochemistry cycle performance improving material;
(2) pattern of nickle cobalt lithium manganate finished product and granularity depend primarily on presoma, the present invention directly with nanometer spherical nickel cobalt manganese hydroxide precursor for raw material, each element can be made to mix in molecular level level, make product component homogeneous, thus reduce cation mixing; This programme control point is few, decreases production stage, is easy to produce, and technique is simple, properties of product good stability;
(3) adopt the jet mill grinding equipment improved to adulterate to finished product, and carry out coated with aluminium oxide, the product granularity of production is moderate and be evenly distributed, and tap density is large, makes to have good processing characteristics in lithium ion battery production process;
(4) spheroidization of positive electrode powder granule can improve material bulk density and volume and capacity ratio, and spherical product also has excellent mobility, dispersiveness and processability, be conducive to the coating making electrode material slurry and electrode slice, improve electrode slice quality;
(5) there is the advantages such as investment is less, technically reliable, operating cost are low, there is good economic benefit, there is good market popularization value.
Accompanying drawing explanation
Fig. 1 is the process route chart of production alumina-coated nickel-cobalt lithium manganate cathode material.
Embodiment
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with concrete diagram and embodiment, setting forth the present invention further.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Embodiment 1
A preparation method for alumina-coated nickel-cobalt lithium manganate cathode material, comprises the following steps:
(1) raw material mixing: adopt three dimension high efficiency inclined mixer with polyurethane ball for batch mixing medium, 1:0.53 takes lithium carbonate, nanometer spherical nickel cobalt manganese hydroxide precursor in molar ratio, and account for total mixture mass ratio be 10% polyethylene glycol carry out disperseing, mix and pulverizing, form uniform intermediate mixture, wherein the proportion of polyurethane ball is 1.3, ratio of grinding media to material is 3:4:3, and mixing time is 3h;
(2) once sintered: the intermediate mixture of step (1) gained is loaded saggar, send into pushed bat kiln and sinter, produce nickel-cobalt lithium manganate material, sintering process is continual is filled with oxygen, and sintering temperature is 650 DEG C, and sintering time is 3h;
(3) adulterate: select nano level ZnO, doping treatment is carried out to the nickle cobalt lithium manganate of step (2) gained, add in the nickle cobalt lithium manganate of step (2) gained with account for total solid material mass 0.1%, carry out batch mixing;
(4) double sintering: the nickle cobalt lithium manganate through overdoping is sent into pushed bat kiln and carries out double sintering, sintering process is continual is filled with air, and sintering temperature is 900 DEG C, and sintering time is 12h;
(5) coated: the Al (NO of preparation 0.01mol/L
3)
3solution, the nickle cobalt lithium manganate after burning two joins in the middle of solution and mixes, and passes into the ammonia spirit of 1mol/L, and 75 DEG C are stirred 4h; Use distilled water cleaning and filtering, dry 12h at 500 DEG C, obtain by Al
2o
3coated nickle cobalt lithium manganate material positive electrode;
(6) whole grain process: adopt the AF of elite powder Engineered Equipment Co. of Shandong Weifang City series airslide disintegrating mill and grader to carry out whole grain process to the nickle cobalt lithium manganate product through double sintering, adjustment product is pulverized, value parameter, namely obtains nickle cobalt lithium manganate finished product.
Embodiment 2
(1) raw material mixing: adopt three dimension high efficiency inclined mixer with polyurethane ball for batch mixing medium, 1:0.535 takes lithium carbonate, nanometer spherical nickel cobalt manganese hydroxide precursor in molar ratio, and account for total mixture mass ratio be 20% polyethylene glycol carry out disperseing, mix and pulverizing, form uniform intermediate mixture, wherein the proportion of polyurethane ball is 1.5, ratio of grinding media to material is 3:4:3, and mixing time is 3h;
(2) once sintered: the intermediate mixture of step (1) gained is loaded saggar, send into pushed bat kiln and sinter, produce nickel-cobalt lithium manganate material, sintering process is continual is filled with oxygen, and sintering temperature is 700 DEG C, and sintering time is 3h;
(3) adulterate: select nano level MgO, doping treatment is carried out to the nickle cobalt lithium manganate of step (2) gained, add in the nickle cobalt lithium manganate of step (2) gained with account for total solid material mass 0.1%, carry out batch mixing;
(4) double sintering: send into pushed bat kiln carry out double sintering by through overdoping, coated nickle cobalt lithium manganate, sintering process is continual is filled with air, and sintering temperature is 1000 DEG C, and sintering time is 10h;
(5) coated: the Al (NO of preparation 0.03mol/L
3)
3solution, the nickle cobalt lithium manganate after burning two joins in the middle of solution and mixes, and passes into the ammonia spirit of 2mol/L, and 80 DEG C are stirred 5h; Use distilled water cleaning and filtering, dry 16h at 500 DEG C, obtain by Al
2o
3coated nickle cobalt lithium manganate material positive electrode;
(6) whole grain process: adopt airslide disintegrating mill and grader to carry out whole grain process to the nickle cobalt lithium manganate product through double sintering, loading frequency controls at 6 ~ 10Hz, grade frequency controls at 15 ~ 20Hz, and adjustment product is pulverized, value parameter, namely obtains nickle cobalt lithium manganate finished product.
Embodiment 3
(1) raw material mixing: adopt three dimension high efficiency inclined mixer with polyurethane ball for batch mixing medium, 1:0.55 takes lithium carbonate, nanometer spherical nickel cobalt manganese hydroxide precursor in molar ratio, and account for total mixture mass ratio be 30% polyethylene glycol carry out disperseing, mix and pulverizing, form uniform intermediate mixture, wherein the proportion of polyurethane ball is 1.4, ratio of grinding media to material is 3:4:3, and mixing time is 4h;
(2) once sintered: the intermediate mixture of step (1) gained is loaded saggar, send into pushed bat kiln and sinter, produce nickel-cobalt lithium manganate material, sintering process is continual is filled with oxygen, and sintering temperature is 750 DEG C, and sintering time is 5h;
(3) adulterate: select nano level Al
2o
3, doping treatment is carried out to the nickle cobalt lithium manganate of step (2) gained, adds in the nickle cobalt lithium manganate of step (2) gained with account for total solid material mass 0.2%, carry out batch mixing;
(4) double sintering: send into pushed bat kiln carry out double sintering by through overdoping, coated nickle cobalt lithium manganate, sintering process is continual is filled with air, and sintering temperature is 1000 DEG C, and sintering time is 11h;
(5) coated: the Al of preparation 0.06mol/L
2(SO
4)
3solution, the nickle cobalt lithium manganate after burning two joins in the middle of solution and mixes, and passes into the ammonia spirit of 2mol/L, and 75 DEG C are stirred 6h; Use distilled water cleaning and filtering, dry 20h at 600 DEG C, obtain by Al
2o
3coated nickle cobalt lithium manganate material positive electrode;
(6) whole grain process: adopt airslide disintegrating mill and grader to carry out whole grain process to the nickle cobalt lithium manganate product through double sintering, loading frequency controls at 6 ~ 10Hz, grade frequency controls at 15 ~ 20Hz, and adjustment product is pulverized, value parameter, namely obtains nickle cobalt lithium manganate finished product.
Embodiment 4
(1) raw material mixing: adopt three dimension high efficiency inclined mixer with polyurethane ball for batch mixing medium, 1:0.56 takes lithium carbonate, nanometer spherical nickel cobalt manganese hydroxide precursor in molar ratio, and account for total mixture mass ratio be 40% polyethylene glycol carry out disperseing, mix and pulverizing, form uniform intermediate mixture, wherein the proportion of polyurethane ball is 1.4, ratio of grinding media to material is 3:4:3, and mixing time is 4h;
(2) once sintered: the intermediate mixture of step (1) gained is loaded saggar, send into pushed bat kiln and sinter, produce nickel-cobalt lithium manganate material, sintering process is continual is filled with oxygen, and sintering temperature is 700 DEG C, and sintering time is 7h;
(3) adulterate: select nano level TiO
2, doping treatment is carried out to the nickle cobalt lithium manganate of step (2) gained, adds in the nickle cobalt lithium manganate of step (2) gained with account for total solid material mass 0.2%, carry out batch mixing;
(4) double sintering: send into pushed bat kiln carry out double sintering by through overdoping, coated nickle cobalt lithium manganate, sintering process is continual is filled with air, and sintering temperature is 1000 DEG C, and sintering time is 11h;
(5) coated: the Al of preparation 0.01mol/L
2(SO
4)
3solution, the nickle cobalt lithium manganate after burning two joins in the middle of solution and mixes, and passes into the ammonia spirit of 1mol/L, and 75 DEG C are stirred 5h; Use distilled water cleaning and filtering, dry 24h at 600 DEG C, obtain by Al
2o
3coated nickle cobalt lithium manganate material positive electrode;
(6) whole grain process: adopt airslide disintegrating mill and grader to carry out whole grain process to the nickle cobalt lithium manganate product through double sintering, adjustment product is pulverized, value parameter, namely obtains nickle cobalt lithium manganate finished product.
Embodiment 5
A preparation method for alumina-coated nickel-cobalt lithium manganate cathode material, comprises the following steps:
(1) raw material mixing: adopt three dimension high efficiency inclined mixer with polyurethane ball for batch mixing medium, 1:0.53 takes lithium carbonate, nanometer spherical nickel cobalt manganese hydroxide precursor in molar ratio, and account for total mixture mass ratio be 10% polyethylene glycol carry out disperseing, mix and pulverizing, form uniform intermediate mixture, wherein the proportion of polyurethane ball is 1.3, ratio of grinding media to material is 3:4:3, and mixing time is 3h;
(2) once sintered: the intermediate mixture of step (1) gained is loaded saggar, send into pushed bat kiln and sinter, produce nickel-cobalt lithium manganate material, sintering process is continual is filled with oxygen, and sintering temperature is 650 DEG C, and sintering time is 3h;
(3) adulterate: select nano level ZnO, doping treatment is carried out to the nickle cobalt lithium manganate of step (2) gained, add in the nickle cobalt lithium manganate of step (2) gained with account for total solid material mass 0.1%, carry out batch mixing;
(4) double sintering: the nickle cobalt lithium manganate through overdoping is sent into pushed bat kiln and carries out double sintering, sintering process is continual is filled with air, and sintering temperature is 900 DEG C, and sintering time is 12h;
(5) coated: the AlCl of preparation 0.01mol/L
3solution, the nickle cobalt lithium manganate after burning two joins in the middle of solution and mixes, and passes into the ammonia spirit of 1mol/L, and 75 DEG C are stirred 4h; Use distilled water cleaning and filtering, dry 12h at 500 DEG C, obtain by Al
2o
3coated nickle cobalt lithium manganate material positive electrode;
(6) whole grain process: adopt the AF of elite powder Engineered Equipment Co. of Shandong Weifang City series airslide disintegrating mill and grader to carry out whole grain process to the nickle cobalt lithium manganate product through double sintering, adjustment product is pulverized, value parameter, namely obtains nickle cobalt lithium manganate finished product.
Embodiment 6
A preparation method for alumina-coated nickel-cobalt lithium manganate cathode material, comprises the following steps:
(1) raw material mixing: adopt three dimension high efficiency inclined mixer with polyurethane ball for batch mixing medium, 1:0.53 takes lithium carbonate, nanometer spherical nickel cobalt manganese hydroxide precursor in molar ratio, and account for total mixture mass ratio be 10% polyethylene glycol carry out disperseing, mix and pulverizing, form uniform intermediate mixture, wherein the proportion of polyurethane ball is 1.3, ratio of grinding media to material is 3:4:3, and mixing time is 3h;
(2) once sintered: the intermediate mixture of step (1) gained is loaded saggar, send into pushed bat kiln and sinter, produce nickel-cobalt lithium manganate material, sintering process is continual is filled with oxygen, and sintering temperature is 650 DEG C, and sintering time is 3h;
(3) adulterate: select nano level MgO, doping treatment is carried out to the nickle cobalt lithium manganate of step (2) gained, add in the nickle cobalt lithium manganate of step (2) gained with account for total solid material mass 0.1%, carry out batch mixing;
(4) double sintering: the nickle cobalt lithium manganate through overdoping is sent into pushed bat kiln and carries out double sintering, sintering process is continual is filled with air, and sintering temperature is 900 DEG C, and sintering time is 12h;
(5) coated: the AlCl of preparation 0.01mol/L
3solution, the nickle cobalt lithium manganate after burning two joins in the middle of solution and mixes, and passes into the ammonia spirit of 1mol/L, and 75 DEG C are stirred 4h; Use distilled water cleaning and filtering, dry 12h at 500 DEG C, obtain by Al
2o
3coated nickle cobalt lithium manganate material positive electrode;
(6) whole grain process: adopt the AF of elite powder Engineered Equipment Co. of Shandong Weifang City series airslide disintegrating mill and grader to carry out whole grain process to the nickle cobalt lithium manganate product through double sintering, adjustment product is pulverized, value parameter, namely obtains nickle cobalt lithium manganate finished product.
The alumina-coated nickel-cobalt lithium manganate cathode material performance test that distinct methods is obtained
Claims (7)
1. a preparation method for alumina-coated nickel-cobalt lithium manganate cathode material, is characterized in that, comprises the following steps:
(1) raw material mixing: adopt three dimension high efficiency inclined mixer and with polyurethane ball for batch mixing medium, lithium carbonate, nanometer spherical nickel cobalt manganese hydroxide precursor and polyethylene glycol carried out disperseing, mix and pulverizing, forms uniform intermediate mixture;
(2) once sintered: the intermediate mixture of step (1) gained is loaded saggar, send into pushed bat kiln to sinter, produce nickel-cobalt lithium manganate material, sintering process is continual is filled with oxygen, sintering temperature is 650 ~ 750 DEG C, and sintering time is 2 ~ 7h;
(3) adulterate: select nano level ZnO, MgO, Al
2o
3or TiO
2in one, add in the nickel-cobalt lithium manganate material of step (2) gained with account for total solid material mass 0.1 ~ 0.2%, carry out batch mixing;
(4) double sintering: the nickle cobalt lithium manganate through overdoping is sent into pushed bat kiln and carries out double sintering, sintering process is continual is filled with air or oxygen;
(5) coated: preparation molar concentration is the Al solion of 0.01 ~ 0.06mol/L, is joined in solution by the nickle cobalt lithium manganate after double sintering and mixes, pass into ammonia spirit, stir, clean, filter, dry, obtain by Al
2o
3coated nickle cobalt lithium manganate material positive electrode;
(6) whole grain process: adopt special arrangement to carry out whole grain process to the nickle cobalt lithium manganate product through coated process, adjustment product is pulverized, value parameter, namely obtains nickle cobalt lithium manganate finished product.
2. the preparation method of a kind of alumina-coated nickel-cobalt lithium manganate cathode material according to claim 1, is characterized in that: the proportion of the described polyurethane ball of step (1) is >=1.3, and ratio of grinding media to material is 3:4:3, and mixing time is 3 ~ 4h.
3. the preparation method of a kind of alumina-coated nickel-cobalt lithium manganate cathode material according to claim 1 and 2, it is characterized in that: the mol ratio of step (1) described lithium carbonate, nanometer spherical nickel cobalt manganese hydroxide precursor is 1:0.53 ~ 0.56, and the mass ratio that polyethylene glycol accounts for total mixture is 10% ~ 40%.
4. the preparation method of a kind of alumina-coated nickel-cobalt lithium manganate cathode material according to claim 1, is characterized in that: the sintering temperature of step (4) described double sintering is 900 ~ 1000 DEG C, and sintering time is 2 ~ 7h.
5. the preparation method of a kind of alumina-coated nickel-cobalt lithium manganate cathode material according to claim 1, is characterized in that: the temperature of step (5) described stirring is 75 ~ 80 DEG C, and the time of stirring is 4 ~ 6h.
6. the preparation method of a kind of alumina-coated nickel-cobalt lithium manganate cathode material according to claim 1 or 5, is characterized in that: the described Al solion of step (5) is Al (NO
3)
3, Al
2(SO
4)
3or AlCl
3one in solution.
7. the preparation method of a kind of alumina-coated nickel-cobalt lithium manganate cathode material according to claim 1, it is characterized in that: step (6) described special arrangement is airslide disintegrating mill and grader, loading frequency controls at 6 ~ 10Hz, and grade frequency controls at 15 ~ 20Hz.
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