CN109167016A - A kind of anode material for lithium-ion batteries and its preparation method and application - Google Patents
A kind of anode material for lithium-ion batteries and its preparation method and application Download PDFInfo
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- CN109167016A CN109167016A CN201811031780.0A CN201811031780A CN109167016A CN 109167016 A CN109167016 A CN 109167016A CN 201811031780 A CN201811031780 A CN 201811031780A CN 109167016 A CN109167016 A CN 109167016A
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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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
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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
- H01M4/04—Processes of manufacture in general
- H01M4/0438—Processes of manufacture in general by electrochemical processing
- H01M4/045—Electrochemical coating; Electrochemical impregnation
- H01M4/0457—Electrochemical coating; Electrochemical impregnation from dispersions or suspensions; Electrophoresis
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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
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
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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 present invention relates to a kind of anode material for lithium-ion batteries and its preparation method and application, which includes the following steps: positive raw material carrying out ball milling, and is scattered in solvent and obtains suspension；Graphene electrodes and metal electrode are placed in suspension, and apply electric field between electrodes, wherein Graphene electrodes are as anode, and metal electrode is as cathode；Graphene electrodes are taken out and are dried to get anode material for lithium-ion batteries；The preparation method simple process, is easy to large-scale production；And the anode material for lithium-ion batteries that the preparation method is prepared has excellent chemical property and high-rate charge-discharge capability.
Description
Technical field
The present invention relates to electrode material fields, in particular to a kind of anode material for lithium-ion batteries and its preparation side
Method and application.
Background technique
Continuous improvement with hybrid vehicle and pure electric automobile field to power battery performance requirement, lithium-ion electric
Pond is due to having many advantages, such as that lithium ion specific energy is high, self discharge is low, the service life is long as first choice, but the power battery is in the marketization
There is also some problems in the process, its high-rate charge-discharge capability needs further to be promoted for positive electrode, most
In recent years, graphene was as new material, since it is with very big surface area (2675 meters squared per gram), on two-dimensional surface
Superelevation conductivity, become improve electrode material performance of lithium ion battery new carbon.
Although the existing reports for much preparing graphene coated electrode material, due to the ultra-high surface area that graphene has,
Lead to its easily spontaneous stacking and reunion, causes electrode performance poor, and technique is more complex.
For example, the Chinese patent application of Publication No. CN136531998A disclose a kind of anode material for lithium-ion batteries and
Preparation method, the positive electrode active materials are added in solvent by ferric lithium phosphate precursor and graphene raw material, are dried to obtain stone
Black alkenyl phosphoric acid iron lithium presoma is calcined 5-12h in a reducing atmosphere, at 500-800 DEG C and is obtained, battery prepared therefrom,
Under 0.2C current density, discharge capacity is 141mAh/g for the first time.
In view of this, the present invention is specifically proposed.
Summary of the invention
The first object of the present invention is to provide a kind of preparation method of anode material for lithium-ion batteries, which will
Anode material for lithium-ion batteries is prepared in microspheric anode raw material uniform deposition on the surface of graphene, the preparation method technique
Simply, it is easy to large-scale production.
The second object of the present invention is to provide a kind of anode material for lithium-ion batteries, on the anode material for lithium-ion batteries
Positive raw material uniform deposition on the surface of graphene so that the anode material for lithium-ion batteries have excellent chemical property and height
Rate charge-discharge performance.
The third object of the present invention is to provide a kind of lithium ion battery, which has excellent specific discharge capacity and height
The charge-discharge performance of multiplying power.
In order to realize above-mentioned purpose of the invention, the following technical scheme is adopted:
First aspect present invention provides a kind of preparation method of anode material for lithium-ion batteries, which includes as follows
Step:
Positive raw material is subjected to ball milling, and is scattered in solvent and obtains suspension；
Graphene electrodes and metal electrode are placed in suspension, and apply electric field between electrodes, wherein graphene
Electrode is as anode, and metal electrode is as cathode；
Graphene electrodes are taken out and are dried to get anode material for lithium-ion batteries.
It, will by the way that positive stock dispersion to be formed to positively charged sol particle in solvent, and under the action of electric field
Positive raw material uniform deposition on the surface of graphene so that anode material for lithium-ion batteries have excellent chemical property and high power
Rate charge-discharge performance；In addition, the preparation method simple process, is easy to large-scale production；And by the way that positive raw material is carried out ball milling
Processing can reduce the partial size of positive raw material, improve the pattern of positive raw material, be conducive to positive raw material uniform deposition in graphene table
The chemical property of the anode material for lithium-ion batteries is improved in face；Preferably, the Ball-milling Time is 2-24h；It is highly preferred that
The partial size of positive raw material after the ball milling is 0.1-3 μm, and pattern is microspheroidal.
Further, the positive raw material is selected from LiCoO2、LiFePO4、LiMn2O4、Li(NiCoMn)O2With
LiNi0.5Mn1.5O4In any one or more.
The selection of solvent is not limited strictly in the present invention, it is preferable that the solvent be selected from water, ethyl alcohol, ethylene glycol,
Any one or more in propyl alcohol and acetone and N-Methyl pyrrolidone；
Further, the dispersing mode of positive raw material in a solvent can be concussion, ultrasonic disperse；Preferably ultrasound point
It dissipates；Further, the concentration of positive raw material is 0.2-50g/L in the suspension.
By the selection of above-mentioned specific solvent, and the restriction of positive material concentration and dispersing mode, anode can be promoted
Lithium is prepared in the uniformity that is fully dispersed, and depositing on the surface of graphene conducive to positive raw material of raw material in a solvent, raising
The chemical property of ion battery positive electrode.
Application electric field is not limited strictly in the present invention, it is preferable that the electric field is DC electric field；It is highly preferred that
The electric field strength is 5-100V/cm；The application electric field time is 0.5-10min.By the restriction to electric field strength, can control
The movement speed of positive feed particles in a solvent, avoids moving too fast, leads to the accumulation of positive feed particles.
Further, the drying temperature is 30-120 DEG C, drying time 1-24h；By the restriction to drying temperature,
Organic electrolyte solvent in Graphene electrodes can be volatilized as early as possible.
Further, the preparation method further includes doing butadiene-styrene rubber spray solution in Graphene electrodes surface, vacuum
It is dry；Preferably, the mass fraction of butadiene-styrene rubber is 20%-40% in the butadiene-styrene rubber solution；
Further, the vacuum drying temperature is 55-65 DEG C, vacuum degree 0.08-0.1MPa.
Graphene and positive feed particles can securely be glued by spraying butadiene-styrene rubber solution on Graphene electrodes surface
It closes, prevents falling off for subsequent positive feed particles；In addition, the solvent in butadiene-styrene rubber solution is waved by vacuum drying treatment
Hair falls, and prevents butadiene-styrene rubber aging, and adhesive effect is caused to decline, while can be avoided part anode raw material and contacting hair with oxygen
Raw reaction, influences the chemical property of anode material for lithium-ion batteries.
In the present invention Graphene electrodes are not done with stringent limitation, it is preferable that the Graphene electrodes will be by that will expand stone
Ink sheet one side coating conducting resinl, another side are obtained as progress electrolytic preparation in cathode merging organic electrolyte solution；Expand stone
A large amount of graphite are fallen in solution after ink energization, and are remained in the graphite on conducting resinl matrix and continued electrochemical ion intercalation, and
Further the graphite on conducting resinl matrix is removed into graphene by the gas of generation；It is made in situ by above-mentioned electrochemical method
Standby to obtain the Graphene electrodes material of three-D space structure, the Graphene electrodes material of the three-D space structure can be improved anode
Raw material deposition on the surface of graphene and uniformity, improve the chemical property of anode material for lithium-ion batteries；Preferably,
The conducting resinl is graphite/epoxy conducting resinl；It, can be in its surface adhesion subsequent electrochemical method by the setting of conducting resinl
The graphene of preparation, and conducting base can be used as.
Further, the decomposition voltage is 1-5v, electrolysis time 0.5-5h.
Further, the organic electrolyte solution includes organic solvent and electrolytic salt；Wherein, the organic solvent choosing
From organic compounds containing sulfur and/or linear carbonate；The electrolytic salt is selected from LiClO4、Et3NHC and 1- methyl -3- ethyl miaow
Any one in azoles diimine.
Preferably, the sulfur-containing compound in dimethyl sulfoxide, dimethyl sulfone, dimethyl sulphide any one or it is more
Kind；The linear carbonate in dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate any one or more.
By the restriction of above-mentioned organic electrolyte solution, the splitting of expanded graphite can be improved, in conducting resinl surface shape
The Graphene electrodes material for being 1-10 layers at the number of plies.
Further, the Graphene electrodes material obtained to electrolysis is cleaned, is dried；It can remove by cleaning
The electrolyte solution of Graphene electrodes material surface, is then dried, and it is steady to can be improved Graphene electrodes material surface
It is qualitative, it is not easy to stack；Cleaning solvent is not limited strictly in the present invention, it is preferable that the cleaning solvent is selected from lye, acid
Any one or more in liquid, organic solvent and water；Specifically, lye is selected from KOH and/or NaOH；Acid solution is selected from H2SO4、
HF、CH3Any one or more in COOH；Organic solvent appointing in acetone, NMP (N-Methyl pyrrolidone), ethyl alcohol
It anticipates one or more；Preferably, the drying process temperature is 45-55 DEG C.
Second aspect of the present invention provides a kind of anode material for lithium-ion batteries, and the anode material for lithium-ion batteries is by above-mentioned system
Preparation Method is prepared.
Graphene surface uniform deposition has positive raw material in anode material for lithium-ion batteries of the present invention, so that the lithium-ion electric
Pond positive electrode has excellent chemical property and high-rate charge-discharge capability.
Third aspect present invention provides a kind of lithium ion battery, which includes passing through above-mentioned lithium ion battery just
The anode of pole material preparation.
Lithium ion battery of the present invention has excellent specific discharge capacity and powerful charge-discharge performance.
Compared with prior art, beneficial effects of the present invention include at least:
(1) preparation method of anode material for lithium-ion batteries of the present invention is by microspheric positive raw material uniform deposition in graphite
Anode material for lithium-ion batteries is prepared in alkene surface so that anode material for lithium-ion batteries have excellent chemical property and
High-rate charge-discharge capability；In addition, the preparation method simple process, is easy to large-scale production.
(2) graphene surface uniform deposition has positive raw material in anode material for lithium-ion batteries of the present invention so that the lithium from
Sub- cell positive material has excellent chemical property and high-rate charge-discharge capability.
(3) lithium ion battery of the present invention has excellent specific discharge capacity and powerful charge-discharge performance.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the scanning electron microscope diagram of anode material for lithium-ion batteries in the embodiment of the present application 1；
Fig. 2 is Cyclic voltamogram of the anode material for lithium-ion batteries under different scanning speed in the embodiment of the present application 2
Curve；
Fig. 3 is discharge curve of the anode material for lithium-ion batteries under different multiplying in the embodiment of the present application 6；
Fig. 4 is discharge curve of the anode material for lithium-ion batteries under different multiplying in the embodiment of the present application 7；
Fig. 5 is charging and discharging curve of the anode material for lithium-ion batteries under different multiplying in the embodiment of the present application 8.
Specific embodiment
Embodiment of the present invention is described in detail below in conjunction with embodiment, but those skilled in the art will
Understand, the following example is merely to illustrate the present invention, and is not construed as limiting the scope of the invention.It is not specified in embodiment specific
Condition person carries out according to conventional conditions or manufacturer's recommended conditions.Reagents or instruments used without specified manufacturer is
The conventional products obtained can be bought by city.
Embodiment 1
The present embodiment is a kind of preparation method of anode material for lithium-ion batteries, which includes the following steps:
By Expandable graphite sheet one side coating conducting resinl, another side is electric as carrying out in cathode merging organic electrolyte solution
Solution is then cleaned the Graphene electrodes material that electrolysis obtains using acetone, is dried to obtain graphene under the conditions of 50 DEG C
Electrode, wherein organic electrolyte solution is dimethyl sulfoxide and LiClO4Solution；Decomposition voltage is 1v, electrolysis time 5h；
By LiCoO2Ball milling is carried out, and ultrasonic disperse obtains suspension in water, wherein LiCoO2Concentration be 20g/L, ball
LiCoO after mill2Partial size is 0.1-3 μm, Ball-milling Time 10h；
Graphene electrodes and metal electrode are placed in suspension, and apply electric field between electrodes, wherein graphene
Electrode is 5min as cathode, electric field strength 50V/cm, application electric field time as anode, metal electrode；
Graphene electrodes are taken out and are handled for 24 hours at 30 DEG C, then, the butadiene-styrene rubber solution that mass fraction is 20% is sprayed
It is sprinkled upon Graphene electrodes surface, in vacuum degree 0.08MPa, temperature is drying to obtain lithium ion cell positive material under the conditions of being 60 DEG C
Material.
Electron-microscope scanning is carried out to the above-mentioned anode material for lithium-ion batteries being prepared, scanning result is referring to Fig. 1；By Fig. 1
It is found that LiCoO2Particle is uniformly distributed in Graphene electrodes material surface, and forms good conductive network by graphene film.
Embodiment 2
The present embodiment is a kind of preparation method of anode material for lithium-ion batteries, which includes the following steps:
By Expandable graphite sheet one side coating conducting resinl, another side is electric as carrying out in cathode merging organic electrolyte solution
Solution is then cleaned the Graphene electrodes material that electrolysis obtains using acetum, is dried to obtain stone under the conditions of 45 DEG C
Black alkene electrode, wherein organic electrolyte solution is dimethyl sulfone and Et3The solution of NHC；Decomposition voltage is 2v, and electrolysis time is
4h；
By LiNi0.5Mn1.5O4Ball milling is carried out, and ultrasonic disperse obtains suspension in N-Methyl pyrrolidone, wherein
LiNi0.5Mn1.5O4Concentration be 10g/L, the LiNi after ball milling0.5Mn1.5O4Partial size is 0.1-3 μm, Ball-milling Time 10h；
Graphene electrodes and metal electrode are placed in suspension, and apply electric field between electrodes, wherein graphene
Electrode is 7min as cathode, electric field strength 30V/cm, application electric field time as anode, metal electrode；
Graphene electrodes taking-up is handled into 9h at 60 DEG C, then, the butadiene-styrene rubber solution that mass fraction is 20% is sprayed
It is sprinkled upon Graphene electrodes surface, in vacuum degree 0.09MPa, temperature is drying to obtain lithium ion cell positive material under the conditions of being 60 DEG C
Material.
To the above-mentioned anode material for lithium-ion batteries being prepared using electrochemical cyclic voltammetry in different scanning speed
Lower scanning, the Cyclic voltamogram curve scanned is as shown in Fig. 2, as shown in Figure 2, the lithium ion cell positive of above-mentioned preparation
Material has symmetrical redox peaks under different scanning rates, shows the anode material for lithium-ion batteries in higher scanning
Still there is preferable electrochemical reaction invertibity, and peak current increase is proportional to sweep speed, shows the lithium under rate
Ion battery positive electrode has preferable electric conductivity.
Embodiment 3
The present embodiment is a kind of preparation method of anode material for lithium-ion batteries, which includes the following steps:
By Expandable graphite sheet one side coating conducting resinl, another side is electric as carrying out in cathode merging organic electrolyte solution
Solution is then cleaned the Graphene electrodes material that electrolysis obtains using ethyl alcohol, is dried to obtain graphene under the conditions of 55 DEG C
Electrode, wherein organic electrolyte solution is the solution of dimethyl sulfide and 1- methyl -3- ethyl imidazol(e) diimine；Decomposition voltage
For 3v, electrolysis time 3h；
By LiMn2O4Ball milling is carried out, and ultrasonic disperse obtains suspension in ethylene glycol, acetone and N-Methyl pyrrolidone,
Wherein LiMn2O4Concentration be 50g/L, the LiMn after ball milling2O4Partial size is 1.1-3 μm, Ball-milling Time 2h；
Graphene electrodes and metal electrode are placed in suspension, and apply electric field between electrodes, wherein graphene
Electrode is 10min as cathode, electric field strength 5V/cm, application electric field time as anode, metal electrode；
Graphene electrodes taking-up is handled into 10h at 80 DEG C, then, the butadiene-styrene rubber solution that mass fraction is 20% is sprayed
It is sprinkled upon Graphene electrodes surface, in vacuum degree 0.1MPa, temperature is drying to obtain anode material for lithium-ion batteries under the conditions of being 65 DEG C.
Embodiment 4
The present embodiment is a kind of preparation method of anode material for lithium-ion batteries, which includes the following steps:
By Expandable graphite sheet one side coating conducting resinl, another side is electric as carrying out in cathode merging organic electrolyte solution
Solution is then cleaned the obtained Graphene electrodes material of electrolysis using sodium hydroxide solution, dry under the conditions of 50 DEG C
To Graphene electrodes, wherein organic electrolyte solution is the solution of dimethyl sulfoxide and 1- methyl -3- ethyl imidazol(e) diimine；
Decomposition voltage is 4v, electrolysis time 0.5h；
By LiFePO4Ball milling is carried out, and ultrasonic disperse obtains suspension in ethyl alcohol, propyl alcohol, wherein LiFePO4Concentration
LiFePO for 0.2g/L, after ball milling4Partial size is 0.1-2 μm, and Ball-milling Time is for 24 hours；
Graphene electrodes and metal electrode are placed in suspension, and apply electric field between electrodes, wherein graphene
Electrode is 2min as cathode, electric field strength 100V/cm, application electric field time as anode, metal electrode；
Graphene electrodes taking-up is handled into 1h at 120 DEG C, then, the butadiene-styrene rubber solution that mass fraction is 20% is sprayed
It is sprinkled upon Graphene electrodes surface, in vacuum degree 0.08MPa, temperature is drying to obtain lithium ion cell positive material under the conditions of being 55 DEG C
Material.
Embodiment 5
The present embodiment is a kind of preparation method of anode material for lithium-ion batteries, which includes the following steps:
By Expandable graphite sheet one side coating conducting resinl, another side is electric as carrying out in cathode merging organic electrolyte solution
Solution is then cleaned the Graphene electrodes material that electrolysis obtains using acetone, is dried to obtain graphene under the conditions of 50 DEG C
Electrode, wherein organic electrolyte solution is dimethyl sulfone and LiClO4Solution；Decomposition voltage is 4v, electrolysis time 2h；
By Li (NiCoMn) O2Ball milling is carried out, and ultrasonic disperse obtains suspension in propyl alcohol, wherein Li (NiCoMn) O2's
Concentration is 30g/L, Li (NiCoMn) O after ball milling2Partial size is 0.1-3 μm, Ball-milling Time 20h；
Graphene electrodes and metal electrode are placed in suspension, and apply electric field between electrodes, wherein graphene
Electrode is 0.5min as cathode, electric field strength 60V/cm, application electric field time as anode, metal electrode；
Graphene electrodes taking-up is handled into 15h at 100 DEG C, then, the butadiene-styrene rubber solution for being 20% by mass fraction
It is sprayed at Graphene electrodes surface, in vacuum degree 0.1MPa, temperature is drying to obtain lithium ion cell positive material under the conditions of being 60 DEG C
Material.
Embodiment 6
The present embodiment is a kind of lithium ion battery, and the lithium ion battery is by including what 3 preparation method of embodiment was prepared
Anode material for lithium-ion batteries is prepared.
Discharge curve under different multiplying is measured to the above-mentioned lithium ion battery being prepared；Measurement result is referring to Fig. 3；
As shown in Figure 3: above-mentioned lithium ion battery has apparent discharge platform when 3C discharges, and when discharge capacity is with 0.5C is close,
Under 0.5C electric current, discharge capacity 139mAh/g, under 3C electric current, discharge capacity 135mAh/g.
Embodiment 7
The present embodiment is a kind of lithium ion battery, which includes being prepared by 4 preparation method of embodiment
Anode material for lithium-ion batteries preparation anode.
Discharge curve under different multiplying is measured to the above-mentioned lithium ion battery being prepared；Measurement result is referring to fig. 4；
As shown in Figure 4: above-mentioned lithium ion battery voltage platform when 0.5C-5C discharges almost is overlapped, and capacity is put when 5C discharges for 0.5C
95% when electric；Under 0.5C electric current, discharge capacity 154mAh/g, under 2C electric current, discharge capacity 151mAh/g, in 5C
Under electric current, discharge capacity 147mAh/g.
Embodiment 8
The present embodiment is a kind of lithium ion battery, which includes being prepared by 5 preparation method of embodiment
Anode material for lithium-ion batteries preparation anode.
Discharge curve under different multiplying is measured to the above-mentioned lithium ion battery being prepared；Measurement result is referring to Fig. 5；
As shown in Figure 5: above-mentioned anode material for lithium-ion batteries still has preferable charge and discharge platform and higher capacity when 6C discharges,
Under 0.5C electric current, discharge capacity 156mAh/g, under 3C electric current, discharge capacity 146mAh/g, under 6C electric current, electric discharge
Capacity is 137mAh/g.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, but those skilled in the art should understand that: its
It is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features
It is equivalently replaced；And these are modified or replaceed, various embodiments of the present invention skill that it does not separate the essence of the corresponding technical solution
The range of art scheme.
Claims (10)
1. a kind of preparation method of anode material for lithium-ion batteries, which comprises the steps of:
Positive raw material is subjected to ball milling, and is scattered in solvent and obtains suspension；
Graphene electrodes and metal electrode are placed in suspension, and apply electric field between electrodes, wherein Graphene electrodes
As anode, metal electrode is as cathode；
Graphene electrodes are taken out and are dried to get anode material for lithium-ion batteries.
2. preparation method according to claim 1, which is characterized in that the anode raw material is selected from LiCoO2、LiFePO4、
LiMn2O4、Li(NiCoMn)O2And LiNi0.5Mn1.5O4In any one or more；
Preferably, the Ball-milling Time is 2-24h；
Preferably, the partial size of the positive raw material after the ball milling is 0.1-3 μm, and pattern is microspheroidal.
3. preparation method according to claim 1, which is characterized in that the solvent be selected from water, ethyl alcohol, ethylene glycol, propyl alcohol,
Any one or more in acetone and N-Methyl pyrrolidone；
Preferably, the concentration of positive raw material is 0.2-50g/L in the suspension.
4. preparation method according to claim 1, which is characterized in that the electric field is DC electric field；Electric field strength is 5-
100V/cm；The application electric field time is 0.5-10min.
5. preparation method according to claim 1, which is characterized in that the drying temperature is 30-120 DEG C, drying time
For 1-24h；
Preferably, the preparation method further include: spray butadiene-styrene rubber solution, and vacuum in Graphene electrodes surface after the drying
It is dry；
Preferably, the mass fraction of butadiene-styrene rubber is 20%-40% in the butadiene-styrene rubber solution；
Preferably, the vacuum drying temperature is 55-65 DEG C, vacuum degree 0.08-0.1MPa.
6. preparation method according to claim 1, which is characterized in that the Graphene electrodes are by by Expandable graphite sheet one
Face coats conducting resinl, and another side is obtained as progress electrolytic preparation in cathode merging organic electrolyte solution；
Preferably, the decomposition voltage is 1-5v, electrolysis time 0.5-5h.
7. preparation method according to claim 6, which is characterized in that the organic electrolyte solution include organic solvent and
Electrolytic salt；Wherein, the organic solvent is selected from organic compounds containing sulfur and/or linear carbonate；The electrolytic salt is selected from
LiClO4、Et3Any one in NHC and 1- methyl -3- ethyl imidazol(e) diimine.
8. preparation method according to claim 7, which is characterized in that the sulfur-containing compound is selected from dimethyl sulfoxide, two
Any one or more in methyl sulfone and dimethyl sulphide；
Preferably, the linear carbonate in dimethyl carbonate, diethyl carbonate and methyl ethyl carbonate any one or it is more
Kind.
9. a kind of anode material for lithium-ion batteries, which is characterized in that be prepared by any preparation method of claim 1-8
It arrives.
10. a kind of lithium ion battery, which is characterized in that including passing through anode material for lithium-ion batteries system as claimed in claim 9
Standby anode.
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Cited By (1)
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| CN112645314A (en) * | 2021-01-25 | 2021-04-13 | 唐山航天万源科技有限公司 | Graphene conductive liquid and preparation method and application thereof |
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