CN109279658A - A kind of method that magnetic field texturing prepares nickel galaxite positive electrode - Google Patents
A kind of method that magnetic field texturing prepares nickel galaxite positive electrode Download PDFInfo
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- CN109279658A CN109279658A CN201810862650.5A CN201810862650A CN109279658A CN 109279658 A CN109279658 A CN 109279658A CN 201810862650 A CN201810862650 A CN 201810862650A CN 109279658 A CN109279658 A CN 109279658A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G53/00—Compounds of nickel
- C01G53/40—Nickelates
- C01G53/42—Nickelates containing alkali metals, e.g. LiNiO2
- C01G53/44—Nickelates containing alkali metals, e.g. LiNiO2 containing manganese
- C01G53/54—Nickelates containing alkali metals, e.g. LiNiO2 containing manganese of the type [Mn2O4]-, e.g. Li(NixMn2-x)O4, Li(MyNixMn2-x-y)O4
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- 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
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- 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
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a kind of methods that magnetic field texturing prepares nickel galaxite positive electrode.This preparation method prepares nickel manganese presoma by coprecipitation the following steps are included: 1) with nickel salt and manganese salt；2) nickel manganese presoma is uniformly mixed with lithium source, calcines, obtains nickel galaxite material；3) nickel galaxite material fragmentation is sieved, is stirred in blender with auxiliary agent, external magnetic field is applied to slurry in whipping process.The present invention utilizes Mn3+With the interaction in magnetic field, texturing processing is realized by magnetic field, so that anode sizing agent be coated in aluminium foil on to the maximum extent with (111) crystal face towards and electrolyte contacts direction, thus achieve the purpose that improve nickel galaxite charge and discharge process in capacity attenuation and high temperature cyclic performance it is bad.Circulation is excellent with high rate performance after the anode pole piece of this method preparation is assembled into battery, and energy density is high, in the great application prospect in the fields such as power vehicle, large-sized power plant.
Description
Technical field
The invention belongs to anode material for lithium-ion batteries technical field, in particular to a kind of magnetic field texturing prepares nickel manganese point
The method of spar positive electrode.
Background technique
Lithium ion battery due to have both operating voltage height, memory-less effect, it is environmentally protective the advantages that, be widely used to pen
Remember the field the 3C such as this computer, mobile phone.The development of electric car, hybrid-electric car and other large-sized power plants is then to it
Performance proposes higher requirement, particularly necessary and urgent be the further energy density for promoting lithium ion battery,
Power density.High-energy density can assign battery system better safety, while will also further reduce battery volume, again
Amount, realizes lightweight to a certain extent.
The LiNi of spinel structure0.5Mn1.5O4With 4.7V (vs.Li/Li+) electrion platform, theoretical capacity
147mAh/g, energy density are expected to become next-generation advanced anode material for lithium-ion batteries up to 650Wh/kg.But as just
Pole material in charge and discharge process there are capacity attenuation, high temperature cyclic performance is bad the problems such as, the reason of causing above-mentioned phenomenon master
Have: one, the deintercalation repeatedly of Jahn-Teller effect, i.e. lithium ion causes lattice structure to be distorted, and symmetry reduces, brilliant
Irreversible transformation by cubic phase to tetragonal phase occurs for body structure, leads to the decline of material property.Two, Mn3+Spontaneous disproportionation is anti-
It answers.Mn3+It is thermodynamically unstable, electric discharge latter stage Mn3+It is dense, it can be sent to Mn certainly2+And Mn4+Transformation, during this
Following reaction: 2Mn occurs3+(s)→Mn2+(l)+Mn4+(s), Mn2+It is soluble in electrolyte, to cause the damage of active material
It loses.Three, oxygenolysis of the positive electrode to salt in electrolyte.For nickel galaxite positive electrode under Charging state, height takes off lithium shape
There are the Ni of high concentration, strong oxidizing property for the material of state4+Ion can be lasting in electrode surface oxygenolysis electrolyte, generate it is great
Corrosive HF.Four, HF is to the corrosion of positive electrode and the dissolution of metal ion.HF to the corrosion of electrode material so that nickel and
Manganese ion is dissolved into electrolyte from positive electrode, to cause the destruction of material structure and the decaying of discharge capacity.
Currently, the bad equal industry technologies barrier problem of capacity attenuation and high temperature cyclic performance for improvement nickel galaxite is general
All over process means such as bulk phase-doped, the surface claddings used.Lee etc. refers to low crystal face in nickel galaxite using first principle
The surface of number crystal plane can be carried out calculating, it is indicated that and (111) crystal face has most close atomic arrangement, minimum surface energy, and
And the diffusion coefficient of lithium ion can be improved, so as to improve positive electrode high rate performance (Nanotechnology, 2013,24
(42):424007).Lin etc. is with the nanometer Mn of cube porous structure2O3Particle is prepared for predominantly (111) brilliant as template
The nickel galaxite positive electrode of planar orientation.Electrochemical property test shows there is this predominantly (111) high preferred orientation just
Pole material has splendid circulation and high rate performance, and the capacity retention ratio that 3000 times are recycled under room temperature 10C multiplying power is 78.1%；
500 capacity retention ratios of 5C circulation are 83.2% (J.Mater.Chem.A.2014,2:11987- under 55 DEG C of hot environments
11995).The research further points out the formation that (111) crystal face peomotes protective SEI (solid electrolyte) film,
To assign nickel galaxite positive electrode outstanding cyclical stability.It can be seen that the nickel manganese point with (111) high preferred orientation
Spar positive electrode has apparent advantage in terms of promoting circulation and high rate performance.
In addition it should be pointed out that there are two types of space group structures, i.e. order type P4 for nickel galaxite tool3The original letter of 32 types
Single cubic structure and unordered type Fd3m type face-centred cubic structure.Wherein, due to there is part Lacking oxygen in unordered type Fd3m structure
In the presence of to maintain electroneutral principle, part manganese ion is with Mn3+Form exist.It is orderly and unordered in nickel galaxite material
Structure is typically co-existing, i.e., inevitably has Mn in material3+Presence, and the presence of a certain amount of disordered structure is for nickel
The chemical property of galaxite positive electrode is extremely advantageous.The coulomb potential calculation of lithium ion diffusion path shows nothing
The space sequence Fd3m group structure is more advantageous to the diffusion of lithium ion, and the high rate performance of the diffusion rate of lithium ion and positive electrode ceases
Manner of breathing closes.In terms of electronic conductivity, since there are the Mn of high conductivity in unordered type spinelle3+, the electricity of unordered type spinelle
Conductance (10-4.5S·cm-1) more orderly spinelle conductivity (10-7S·cm-1) high 2.5 orders of magnitude.Therefore, unordered type point
Spar is more suitable for the charge and discharge under big multiplying power than orderly spinelle.To the nickel galaxite charge and discharge process of different spaces group structure
The in-situ TiC particles of lithium ion deintercalation depth analysis shows, order type P4332 need to undergo phase transition twice between three kinds of cubic structures,
And unordered type Fd3m only undergoes a phase transition between two kinds of cubic structures.This shows in low current charge and discharge, either
Fd3m type or P4332 types have time enough to carry out lithium ion abjection and insertion, show preferable performance.And
Charge and discharge under high magnification, P4332 types are easy for when not having time enough completion mutually to convert twice since poor structure can
Inverse property leads to occur phase hysteresis in charge and discharge process, leads to poor chemical property.Therefore, unordered type Fd3m structure
Nickel galaxite has better chemical property.
Mantriram A etc. utilizes Mn using NMR (nuclear magnetic resonance) technology3+Interaction with magnetic field is to nickel galaxite
The degree of order of middle cation is characterized (J.Mater.Chem.A.2013,1:10745-10752).This means that nickel manganese point
Mn in spar3+There are interaction forces between magnetic field, and crystal grain can present fixed in a particular direction under the influence of a magnetic field
To distribution.It handles in fact, carrying out texturing to material by the method for externally-applied magnetic field to promote the performance of material many
Field is applied.Wang etc. makes alumina grain that directional profile be presented using the method for externally-applied magnetic field, and what is finally prepared is saturating
Bright ceramics straight line transmittance slip-casting shaping process more common in 400-1000nm wave-length coverage improves nearly 40%
(J.Am.Ceram.Soc.2008,91(10):3431-3433).CN103130508A discloses a kind of with magnetic field texturing processing
The preparation method of boride ultra-temperature ceramics improves single-phase boride ceramics and is difficult to the drawbacks of densifying, the pottery thus prepared
Porcelain relative density is greater than 98%, and orientation factor f (001) is up to 0.95, and properties are not more textured in particular directions
Performance has promotion by a relatively large margin.
Although can be to a certain extent it is worth noting that, existing technological means is for example bulk phase-doped, surface coats
The problems such as improving the capacity attenuation and bad high temperature cyclic performance of nickel galaxite, but it is living due to requiring introducing non-electrochemical greatly
Property substance, thus inevitably the specific capacity of positive electrode is caused to cut down.And with other electro-chemical activity positive electrodes
Though cladding nickel galaxite prepare the isostructural mode of core-shell structure copolymer, gradient distribution will not specific capacity reduce, process flow is complicated,
It is unfavorable for industrialization production.
Summary of the invention
The present invention is directed to utilize Mn by introducing externally-applied magnetic field3+With the interaction in magnetic field, to positive electrode to be coated
Slurry carries out texturing processing, gives full play in nickel galaxite the advantage of (111) high preferred orientation, makes its maximum direction
With the direction of electrolyte contacts, so that reaching improves nickel galaxite capacity attenuation and the problems such as bad cycle performance, Jin Erti
For a kind of method that magnetic field texturing prepares nickel galaxite positive electrode.
In order to achieve the above-mentioned object of the invention, the technical solution used in the present invention is:
A kind of method that magnetic field texturing prepares nickel galaxite positive electrode, comprising the following steps:
1) nickel salt and manganese salt are used, nickel manganese presoma is prepared by coprecipitation；
2) nickel manganese presoma is uniformly mixed with lithium source, calcines, obtains nickel galaxite material；
3) nickel galaxite material fragmentation is sieved, is mixed in blender with auxiliary agent, to slurry in whipping process
Apply external magnetic field, to obtain the textured nickel galaxite positive electrode in magnetic field.
In step 1), coprecipitation prepare nickel manganese presoma the following steps are included:
S1: nickel salt and manganese salt are uniformly mixed in water, and being made into metal ion total concentration is 0.35mol/L~0.8mol/L
Metal salt solution；
S2: the precipitant solution with metal salt solution same volume and concentration is prepared；
S3: compound concentration is the ammonia spirit of 0.3mol/L~0.6mol/L；
S4: metal salt solution, precipitant solution and ammonia spirit are introduced into reaction kettle, and reaction is mixed, is sunk
Starch；
S5: sediment is washed, dry, obtains nickel manganese presoma.
In step 1), the molar ratio of nickel ion and manganese ion is 1:3.
In step 1), precipitating reagent is at least one of sodium carbonate, sodium hydroxide, oxalic acid, ammonium oxalate.
In step 2), the molar ratio of control Li and Me is (0.9~1.2): 1, wherein Me is transition metal Ni and Mn.
In step 2), the temperature of calcining is 700 DEG C~1050 DEG C, and the time of calcining is 8h~18h.
In step 3), the agitating shaft angle of magnetic field and blender is 0~90 °.
In step 3), the intensity in magnetic field is 6T~20T.
In step 3), auxiliary agent is at least one of conductive agent, binder, solvent, dispersing agent, defoaming agent, plasticizer.
A kind of anode material for lithium-ion batteries, including this resulting material of magnetic field texturing preparation method.
The beneficial effects of the present invention are:
The present invention utilizes Mn3+With the interaction in magnetic field, texturing processing is realized by magnetic field, so that anode sizing agent coats
To the maximum extent with (111) crystal face towards the direction with electrolyte contacts on aluminium foil, filled to reach and improve nickel galaxite
The bad purpose of capacity attenuation and high temperature cyclic performance in discharge process.After the anode pole piece of this method preparation is assembled into battery
Recycle, energy density height, in the fields such as power vehicle, large-sized power plant great application prospect excellent with high rate performance.
It is specific as follows:
Firstly, the present invention and having not been changed the process flow that existing coprecipitation prepares positive electrode, it is only necessary in anode sizing agent
The magnetic field of additional some strength in whipping process, texturing process is synchronous with the preparation process of slurry to be coated to carry out, and both will not
Increase new process, will not extend manufacture cycle.Secondly, the characteristic for making full use of material to form, plays material to greatest extent
Expect the advantage in structure, and is not introduced into the non-electroactive substance for reducing positive electrode specific capacity in the process.
Detailed description of the invention
Fig. 1 is the externally-applied magnetic field and anode sizing agent agitating shaft angle orientation schematic diagram that the present invention applies；
Fig. 2 is the octahedron nickel galaxite scanning of materials Electronic Speculum prepared by the present invention with (111) high preferred orientation structure
Figure.
Specific embodiment
A kind of method that magnetic field texturing prepares nickel galaxite positive electrode, comprising the following steps:
1) nickel salt and manganese salt are used, nickel manganese presoma is prepared by coprecipitation；
2) nickel manganese presoma is uniformly mixed with lithium source, calcines, obtains nickel galaxite material；
3) nickel galaxite material fragmentation is sieved, is mixed in blender with auxiliary agent, to slurry in whipping process
Apply external magnetic field, to obtain the textured nickel galaxite positive electrode in magnetic field.
Further, in step 1), coprecipitation prepare nickel manganese presoma the following steps are included:
S1: nickel salt and manganese salt are uniformly mixed in water, and being made into metal ion total concentration is 0.35mol/L~0.8mol/L
Metal salt solution；
S2: the precipitant solution with metal salt solution same volume and concentration is prepared；
S3: compound concentration is the ammonia spirit of 0.3mol/L~0.6mol/L；
S4: metal salt solution, precipitant solution and ammonia spirit are introduced into reaction kettle, and reaction is mixed, is sunk
Starch；
S5: sediment is washed, dry, obtains nickel manganese presoma.
Preferably, in step 1), the molar ratio of nickel ion and manganese ion is 1:3.
Preferably, in step 1), nickel salt be the sulfate of nickel, acetate, nitrate, oxalates, in chloride at least
It is a kind of；Further, nickel salt is at least one of nickel sulfate, nickel acetate, nickel nitrate, nickel chloride, nickel oxalate.
Preferably, in step 1), manganese salt be the sulfate of manganese, acetate, nitrate, oxalates, in chloride at least
It is a kind of；Further, manganese salt is at least one of manganese sulfate, manganese nitrate, manganese chloride, manganese oxalate.
Preferably, in step 1), precipitating reagent is at least one of sodium carbonate, sodium hydroxide, oxalic acid, ammonium oxalate.
Preferably, in the S4 of step 1), metal salt solution, precipitant solution and ammonia spirit are introduced instead by peristaltic pump
It answers in kettle.
Preferably, in the S4 of step 1), the temperature of reaction is 40 DEG C~70 DEG C, and the time of reaction is 7h~16h, stirring
Speed is 800r/min~1200r/min, and the pH control of reaction is 9.5~11；PH value is controlled by online pH meter.
Preferably, it in the S5 of step 1), washs to be washed with deionized at least three times, it is dry under protective atmosphere
115 DEG C~125 DEG C dry 20h~30h；Protective atmosphere is nitrogen or inert gas.
Preferably, in step 2), control Li and Me molar ratio be (0.9~1.2): 1, wherein Me be transition metal Ni and
Mn。
Preferably, in step 2), the temperature of calcining is 700 DEG C~1050 DEG C, and the time of calcining is 8h~18h.
Further, the nickel galaxite material that step 2) obtains has the octahedron of predominantly (111) high preferred orientation.
Preferably, in step 3), being crushed sieving was specially 400 mesh vibrating screens, controlled grain diameter D50For 3 μm~12 μ
m。
Preferably, in step 3), the agitating shaft angle (θ) of magnetic field and blender is 0~90 °.In whipping process, to just
Pole slurry applies an externally-applied magnetic field, and the angle theta by changing magnetic direction and agitating shaft reaches change (111) crystal plane orientation row
The purpose of cloth.Concrete condition need to refer to the coating processes of anode pole piece, it is ensured that (111) the maximum direction of crystal face and electrolyte
The direction of contact.
The externally-applied magnetic field that the present invention applies attached drawing 1 visible with anode sizing agent agitating shaft angle orientation schematic diagram.Blender
Agitating shaft is perpendicular to horizontal plane.
Preferably, in step 3), the intensity in magnetic field is 6T~20T.
Preferably, in step 3), auxiliary agent be conductive agent, binder, solvent, dispersing agent, defoaming agent, in plasticizer at least
It is a kind of.The auxiliary agents such as conductive agent, binder, solvent, dispersing agent, defoaming agent, plasticizer are the common raw material of this field, specific
Type is the common knowledge of this field.As KS-6/SP can be selected in conductive agent, PVDF can be selected in binder, solvent choosing can use NMP.
A kind of anode material for lithium-ion batteries, including this resulting material of magnetic field texturing preparation method.
Further, the textured positive electrode in magnetic field is applied on aluminium foil, lithium ion cell positive is made.
Preferably, the method for coating is scraper method or roller milling process.
The contents of the present invention are described in further detail below by way of specific embodiment.Original used in embodiment
Material unless otherwise specified, can be obtained from routine business approach.
Embodiment 1:
Nickel nitrate, manganese nitrate are dissolved in deionized water according to molar ratio 1:3, being prepared into concentration of metal ions is
The salting liquid of 0.35mol/L, while the sodium carbonate for preparing same volume same concentrations is made as the ammonium hydroxide of precipitating reagent, 0.4mol/L
For complexing agent, and with peristaltic pump by three kinds of components to be introduced into reaction kettle in equal volume, control reaction temperature is 55 ± 0.5 DEG C,
PH value is 10 ± 0.2, mixing speed 1000r/min.After gained sediment is after reaction 12h with deionized water cleaning 3 times, in nitrogen
The lower 120 DEG C of dryings of gas shielded atmosphere are for 24 hours.Gained presoma is uniformly mixed with lithium carbonate according to molar ratio Li/Me=1.2, in height
1050 DEG C of calcining 8h in warm furnace.Resulting blocky fission is mixed and made into anode sizing agent with binder, conductive agent after broken sieving,
And applying in whipping process with intensity is the externally-applied magnetic field of 10T, the angle of magnetic direction and slurry agitation axis is 0 °, is thus made
It is standby to obtain the magnetic field texturing nickel galaxite positive electrode of embodiment 1, the visible attached drawing 2 of scanning electron microscope (SEM) photograph.It can from attached drawing 2
See, nickel galaxite positive electrode has well-regulated octahedral structure, and after magnetic field texturing processing, particle shows obviously
Distribution of orientations, (111) crystal face towards unanimous on the whole.
Embodiment 1 is completed textured anode sizing agent to be coated on aluminium foil using scraper method and make anode pole piece.Half
In battery testing, first charge discharge efficiency 89.5%, specific capacity 131.6mAh/g recycles 200 capacity at room temperature and protects under 2C multiplying power
Holdup is 97.1%.
Embodiment 2:
Nickel sulfate, manganese sulfate are dissolved in deionized water according to molar ratio 1:3, being prepared into concentration of metal ions is
The salting liquid of 0.8mol/L, while the sodium hydroxide of same volume same concentrations is prepared as precipitating reagent, the ammonium hydroxide of 0.6mol/L
As complexing agent, and with peristaltic pump by three kinds of components to be introduced into reaction kettle in equal volume, control reaction temperature be 70 ± 0.5
DEG C, pH value is 9.7 ± 0.2, mixing speed 800r/min.After gained sediment is after reaction 7h with deionized water cleaning 3 times,
The lower 120 DEG C of dryings of argon atmosphere are for 24 hours.Gained presoma is uniformly mixed with lithium carbonate according to molar ratio Li/Me=1.02,
900 DEG C of calcining 13h in high temperature furnace.Resulting blocky fission is mixed and made into positive slurry with binder, conductive agent after broken sieving
Material, and applying in whipping process with intensity is the externally-applied magnetic field of 20T, the angle of magnetic direction and slurry agitation axis is 45 °, by
The magnetic field texturing nickel galaxite positive electrode of embodiment 2 is prepared in this.
Embodiment 2 is completed textured anode sizing agent to be coated on aluminium foil using scraper method and be fabricated to anode pole piece.?
In half-cell test, first charge discharge efficiency 91.3%, specific capacity 134.2mAh/g recycles 200 capacity at room temperature under 2C multiplying power
Conservation rate is 98.4%.
Embodiment 3:
Nickel acetate, manganese acetate are dissolved in deionized water according to molar ratio 1:3, being prepared into concentration of metal ions is
The salting liquid of 0.6mol/L, while the ammonium oxalate for preparing same volume same concentrations is made as the ammonium hydroxide of precipitating reagent, 0.3mol/L
For complexing agent, and with peristaltic pump by three kinds of components to be introduced into reaction kettle in equal volume, control reaction temperature is 40 ± 0.5 DEG C,
PH value is 10.8 ± 0.2, mixing speed 1200r/min.After gained sediment is after reaction 16h with deionized water cleaning 3 times,
The lower 120 DEG C of dryings of nitrogen protection atmosphere are for 24 hours.Gained presoma is uniformly mixed with lithium carbonate according to molar ratio Li/Me=0.9,
700 DEG C of calcining 18h in high temperature furnace.Resulting blocky fission is mixed and made into positive slurry with binder, conductive agent after broken sieving
Material, and applying in whipping process with intensity is the externally-applied magnetic field of 6T, the angle of magnetic direction and slurry agitation axis is 90 °, by
The magnetic field texturing nickel galaxite positive electrode of embodiment 3 is prepared in this.
Embodiment 3 is completed textured anode sizing agent to be coated on aluminium foil using scraper method and be fabricated to anode pole piece.?
In half-cell test, first charge discharge efficiency 90.2%, specific capacity 132.6mAh/g recycles 200 capacity at room temperature under 2C multiplying power
Conservation rate is 97.7%.
Embodiment 4:
Nickel nitrate, manganese acetate are dissolved in deionized water according to molar ratio 1:3, being prepared into concentration of metal ions is
The salting liquid of 0.5mol/L, while preparing ammonium hydroxide conduct of the oxalic acid of same volume same concentrations as precipitating reagent, 0.5mol/L
Complexing agent, and with peristaltic pump by three kinds of components to be introduced into reaction kettle in equal volume, control reaction temperature be 60 ± 0.5 DEG C, pH
Value is 10.5 ± 0.2, mixing speed 950r/min.After gained sediment is after reaction 10h with deionized water cleaning 3 times, in argon
The lower 120 DEG C of dryings of gas shielded atmosphere are for 24 hours.Gained presoma is uniformly mixed with lithium carbonate according to molar ratio Li/Me=1.1, in height
850 DEG C of calcining 15h in warm furnace.Resulting blocky fission is mixed and made into anode sizing agent with binder, conductive agent after broken sieving,
And applying in whipping process with intensity is the externally-applied magnetic field of 14T, the angle of magnetic direction and slurry agitation axis is 30 °, thus
The magnetic field texturing nickel galaxite positive electrode of embodiment 4 is prepared.
Embodiment 4 is completed textured anode sizing agent to be coated on aluminium foil using scraper method and be fabricated to anode pole piece.?
In half-cell test, first charge discharge efficiency 89.9%, specific capacity 132.2mAh/g recycles 200 capacity at room temperature under 2C multiplying power
Conservation rate is 97.4%.
Comparative example 1:
Nickel nitrate, manganese acetate are dissolved in deionized water according to molar ratio 1:3, being prepared into concentration of metal ions is
The salting liquid of 0.5mol/L, while preparing ammonium hydroxide conduct of the oxalic acid of same volume same concentrations as precipitating reagent, 0.6mol/L
Complexing agent, and with peristaltic pump by three kinds of components to be introduced into reaction kettle in equal volume, control reaction temperature be 55 ± 0.5 DEG C, pH
Value is 9.9 ± 0.2, mixing speed 1000r/min.After gained sediment is after reaction 11h with deionized water cleaning 3 times, in argon
The lower 120 DEG C of dryings of gas shielded atmosphere are for 24 hours.Gained presoma is uniformly mixed with lithium carbonate according to molar ratio Li/Me=1.05, in height
870 DEG C of calcining 14h in warm furnace.Resulting blocky fission is mixed and made into anode sizing agent with binder, conductive agent after broken sieving,
And not applying externally-applied magnetic field in whipping process, anode sizing agent is coated on aluminium foil using scraper method and is fabricated to anode pole piece.
For comparative example 1 due to not applying externally-applied magnetic field, nickel galaxite particle is in random distribution rather than aligns, in half electricity
In the test of pond, first charge discharge efficiency is only 88.17%, specific capacity 129.6mAh/g, recycles 200 capacity under 2C multiplying power at room temperature
Conservation rate is 93.4%.
Comparative example 2:
Nickel nitrate, manganese acetate are dissolved in deionized water according to molar ratio 1:3, being prepared into concentration of metal ions is
The salting liquid of 0.6mol/L, while preparing ammonium hydroxide conduct of the oxalic acid of same volume same concentrations as precipitating reagent, 0.4mol/L
Complexing agent, and with peristaltic pump by three kinds of components to be introduced into reaction kettle in equal volume, control reaction temperature be 45 ± 0.5 DEG C, pH
Value is 9.6 ± 0.2, mixing speed 950r/min.After gained sediment is after reaction 10h with deionized water cleaning 3 times, in argon gas
The lower 120 DEG C of dryings of protective atmosphere are for 24 hours.Gained presoma is uniformly mixed with lithium carbonate according to molar ratio Li/Me=1.05, in high temperature
1000 DEG C of calcining 12h in furnace.Resulting blocky fission is mixed and made into anode sizing agent with binder, conductive agent after broken sieving,
Anode sizing agent is coated on aluminium foil using scraper method and is fabricated to anode pole piece.
2 anode pole piece of comparative example prepared handles a period of time in the externally-applied magnetic field that intensity is 10T.Due in solid
Particle generation displacement is more difficult under state, and in half-cell test, first charge discharge efficiency is only 88.34%, and specific capacity is
129.9mAh/g, recycling 200 capacity retention ratios under 2C multiplying power at room temperature is 93.7%.
The embodiment of the present invention is described above, but the invention is not limited to above-mentioned specific embodiment parties
Formula, the above mentioned embodiment is only schematical, rather than restrictive, and those skilled in the art are in this hair
Under bright enlightenment, without breaking away from the scope protected by the purposes and claims of the present invention, many forms can be also made, this
It is belonged within protection of the invention a bit.
Claims (10)
1. a kind of method that magnetic field texturing prepares nickel galaxite positive electrode, it is characterised in that: the following steps are included:
1) nickel salt and manganese salt are used, nickel manganese presoma is prepared by coprecipitation；
2) nickel manganese presoma is uniformly mixed with lithium source, calcines, obtains nickel galaxite material；
3) nickel galaxite material fragmentation is sieved, is mixed in blender with auxiliary agent, slurry is applied in whipping process
External magnetic field, to obtain the textured nickel galaxite positive electrode in magnetic field.
2. the method that a kind of magnetic field texturing according to claim 1 prepares nickel galaxite positive electrode, feature exist
In: in step 1), coprecipitation prepare nickel manganese presoma the following steps are included:
S1: nickel salt and manganese salt are uniformly mixed in water, are made into the gold that metal ion total concentration is 0.35mol/L~0.8mol/L
Belong to salting liquid；
S2: the precipitant solution with metal salt solution same volume and concentration is prepared；
S3: compound concentration is the ammonia spirit of 0.3mol/L~0.6mol/L；
S4: metal salt solution, precipitant solution and ammonia spirit are introduced into reaction kettle, and reaction is mixed, obtains sediment；
S5: sediment is washed, dry, obtains nickel manganese presoma.
3. the method that a kind of magnetic field texturing according to claim 1 or 2 prepares nickel galaxite positive electrode, feature
Be: in step 1), the molar ratio of nickel ion and manganese ion is 1:3.
4. the method that a kind of magnetic field texturing according to claim 2 prepares nickel galaxite positive electrode, feature exist
In: in step 1), precipitating reagent is at least one of sodium carbonate, sodium hydroxide, oxalic acid, ammonium oxalate.
5. the method that a kind of magnetic field texturing according to claim 1 prepares nickel galaxite positive electrode, feature exist
In: in step 2), the molar ratio of control Li and Me is (0.9~1.2): 1, wherein Me is transition metal Ni and Mn.
6. the method that a kind of magnetic field texturing according to claim 1 prepares nickel galaxite positive electrode, feature exist
In: in step 2), the temperature of calcining is 700 DEG C~1050 DEG C, and the time of calcining is 8h~18h.
7. the method that a kind of magnetic field texturing according to claim 1 prepares nickel galaxite positive electrode, feature exist
In: in step 3), the agitating shaft angle of magnetic field and blender is 0~90 °.
8. the method that a kind of magnetic field texturing according to claim 1 or claim 7 prepares nickel galaxite positive electrode, feature
Be: in step 3), the intensity in magnetic field is 6T~20T.
9. the method that a kind of magnetic field texturing according to claim 1 prepares nickel galaxite positive electrode, feature exist
In: in step 3), auxiliary agent is at least one of conductive agent, binder, solvent, dispersing agent, defoaming agent, plasticizer.
10. any one of a kind of anode material for lithium-ion batteries, including claim 1~the 9 resulting material of preparation method.
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| CN113816419A (en) * | 2021-08-04 | 2021-12-21 | 绿宸新能源科技(苏州)有限公司 | Modified titanium dioxide manganese cobaltate composite material and preparation method and application thereof |
| CN114204023A (en) * | 2021-11-17 | 2022-03-18 | 合肥国轩高科动力能源有限公司 | Preparation method of low-temperature lithium iron phosphate cathode material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113816419A (en) * | 2021-08-04 | 2021-12-21 | 绿宸新能源科技(苏州)有限公司 | Modified titanium dioxide manganese cobaltate composite material and preparation method and application thereof |
| CN114204023A (en) * | 2021-11-17 | 2022-03-18 | 合肥国轩高科动力能源有限公司 | Preparation method of low-temperature lithium iron phosphate cathode material |
| CN114204023B (en) * | 2021-11-17 | 2022-12-13 | 合肥国轩高科动力能源有限公司 | Preparation method of low-temperature lithium iron phosphate cathode material |
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