CN108461703A - A kind of preparation method of lithium ion battery electrode sizing agent - Google Patents
A kind of preparation method of lithium ion battery electrode sizing agent Download PDFInfo
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- CN108461703A CN108461703A CN201810155657.3A CN201810155657A CN108461703A CN 108461703 A CN108461703 A CN 108461703A CN 201810155657 A CN201810155657 A CN 201810155657A CN 108461703 A CN108461703 A CN 108461703A
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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
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1397—Processes of manufacture of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
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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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a kind of preparation methods of lithium ion battery electrode sizing agent, include the following steps：Binder is uniformly mixed with the 40~50% of solvent volume, glue is prepared；Active matter and residual solvent are subjected to 0.5~1h of revolution stirring and obtain active matter solution；Conductive agent is added in active matter solution again and carries out 0.5~1h of revolution stirring；Glue is added in previous step and carries out 1~3h of vacuum machine stirring, you can lithium ion battery electrode sizing agent is prepared.Operating procedure is simple, reduces beating time, improves mashing efficiency and the stability and uniformity of slurry, improves production efficiency and reduce energy consumption；The viscosity of gained lithium ion battery electrode sizing agent is suitable, and dispersibility and fineness are good, and the lithium ion battery being thus prepared is had excellent performance.
Description
Technical field
The present invention relates to lithium ion battery manufacturing fields, and in particular to a kind of preparation side of lithium ion battery electrode sizing agent
Method.
Background technology
Lithium ion battery have energy density is high, have extended cycle life non-environmental-pollution many advantages, such as, by the wide of people
General favor is applied to the every aspect of human lives, including provides the energy, energy storage, New energy electric for each electronic product
Automobile etc..
Dispensing mashing is important link prepared by lithium ion battery.Mashing is mainly by conductive agent and active matter according to suitable at present
Sequence is added in glue, carries out mechanical agitation, is easy to form reunion after conductive agent and active matter is added, is not easy to disperse, be beaten
Time is more long, reduces production efficiency and influences self-discharge performance, cycle performance and the security performance etc. of lithium ion battery.
Invention content
In order to solve the above technical problems, the present invention provides a kind of preparation methods of lithium ion battery electrode sizing agent.It is described
Production efficiency can be improved in preparation method, reduces energy consumption, improves the stability and uniformity of electrode slurry, in addition so that conductive agent
Contact site with active matter is increased, and battery performance is improved.
The technical solution that the present invention takes is：
A kind of preparation method of lithium ion battery electrode sizing agent, includes the following steps：
S1：Binder is uniformly mixed with the 40~50% of solvent volume, glue is prepared；
S2：Active matter and residual solvent are subjected to 0.5~1h of revolution stirring and obtain active matter solution；Conductive agent is added again
0.5~1h of revolution stirring is carried out in active matter solution；In this way under the action of stirring, conductive agent and the active matter in solution are abundant
Contact improves the two contact site, and then improves battery performance；
The obtained glues of step S1 are added in step S2 by S3 carries out 1~3h of vacuum machine stirring, you can is prepared
Lithium ion battery electrode sizing agent.Vacuum stirring can effectively eliminate the bubble generated in whipping process so that active matter, conductive agent,
Binder mixing is more uniform, and three's contact is abundant.
The active matter, conductive agent, binder three weight ratio be (90~97)：(1~5)：(2~5).If viscous
It is excessively high to tie agent ratio, battery multiplying power and cycle performance can be influenced, binder ratio is too low, and pole piece is easy to drop off, the internal resistance of cell
It is bigger than normal；If conductive agent ratio is too low, the internal resistance of cell is bigger than normal, and conductive agent ratio is excessively high, can influence active matter or binder
Ratio is unfavorable for battery global design；Similarly, active matter ratio it is excessively high the ratio of conductive agent or binder can be caused less than normal from
And battery pole piece caking property or battery core internal resistance are influenced, if active matter ratio is too small, can influence to reduce battery actual energy
Density.
The weight of the solvent is the 40~60% of the active weight.Solvent ratios are too low, prepare slurry viscosity mistake
Height, solvent ratios are excessively high, and it is too low to prepare slurry viscosity, can not be successfully and is coated.
In the step S2, the speed of revolution is 20~60rpm.Speed is low, influences efficiency, and speed is excessively high, prepare glue
Or slurry easy tos produce splashing.
In the step S3, the parameter of vacuum machine stirring is：Revolution speed is 20~60rpm, and rotation linear velocity is 10
~25m/s, vacuum degree are -0.1~-0.085MPa.Revolution and rotation are carried out at the same time, and revolution makes active matter, conduction in slurry
Agent, binder mixing, rotation be by three it is fully dispersed uniformly in a solvent.It can meet production in this speed interval,
Speed is low to be not achieved effect, extend the production time, and speed is high to machine to be caused to damage, and is unfavorable for producing control.
The active matter includes LiFePO4 or tertiary cathode material.Mole of Ni, Co, Mn three in the ternary material
Than being 4:2:4、3:3:3、5:2:3、7:1.5:1.5 or 8:1:1.
The binder is one kind or more of Kynoar, polytetrafluoroethylene (PTFE), butadiene-styrene rubber, sodium carboxymethylcellulose
Kind.
The conductive agent is carbon black, carbon fiber, graphene, carbon nanotube, the one or several kinds of electrically conductive graphite.
The solvent is N-Methyl pyrrolidone, and polyvinylpyrrolidone, polyacrylic acid, polyacrylamide is added
One or more dispersing agents.
The present invention also provides the lithium ion battery electrode sizing agents being prepared according to above-mentioned preparation method.
The viscosity of the lithium ion battery electrode sizing agent is that 2000~10000mPa.s is convenient in this range of viscosities
Production coating.
In the preparation method of lithium ion battery electrode sizing agent provided by the invention, active matter is dispersed in partial solvent in advance
Middle formation solution, then conductive agent is added in active matter solution and carries out mixing dispersion；It is eventually adding molten by binder and part
The glue that agent is mixed to get, after addition binder by active matter together with conductive agent even adhesion.
The present invention is uniformly mixed by being first added to conductive agent in the solution of active matter, improves active matter and conduction
Agent mutual contact site, and then raising battery performance, entire slurry are uniformly dispersed, and avoid powder and are directly added into glue
In liquid, powder, which is formed, reunites, and is not easy to disperse, reduces beating time, improves mashing efficiency, and machinery revolution is only needed to stir in addition
It mixes, reduces stirring energy consumption.And be added in step in glue and stirred using vacuum machine, shorten the time of stirring.
Compared with prior art, the present invention has the following advantages：Operating procedure is simple, reduces beating time, improves
It is beaten efficiency and the stability and uniformity of slurry, production efficiency is improved and reduces energy consumption；Gained lithium ion battery battery
The viscosity of pole slurry is suitable, and dispersibility and fineness are good, and the lithium ion battery being thus prepared is had excellent performance.
Specific implementation mode
The following describes the present invention in detail with reference to examples.
Embodiment 1
A kind of preparation method of lithium ion battery electrode sizing agent, includes the following steps：
S1：Binder Kynoar is uniformly mixed with the solvent N-methyl pyrilidone of half, glue is prepared；
S2：Active matter LiFePO4 is added in agitated kettle revolve round the sun with the other half solvent N-methyl pyrilidone and is stirred
It mixes 0.5h and obtains active matter solution, the speed of revolution is 20rpm；Conductive agent carbon black is added in active matter solution again and is revolved round the sun
1h is stirred, the speed of revolution is 20rpm；
S3：The obtained glues of step S1 are added in step S2 and carry out vacuum machine stirring 2h, the speed of stirring is public affairs
The speed turned is 20rpm, and rotation linear velocity is 15m/s, and vacuum degree is -0.085Mpa, you can lithium ion battery battery is prepared
Pole slurry.
In above step, LiFePO4, carbon black, Kynoar three weight ratio be 94:3:3；N- methylpyrroles
The quality of alkanone is the 40% of LiFePO4 quality.
Embodiment 2
A kind of preparation method of lithium ion battery electrode sizing agent, includes the following steps：
S1：Binder Kynoar is uniformly mixed with the 40% of solvent N-methyl pyrilidone volume, is prepared
Glue；
S2：Tertiary cathode material and residual solvent N-Methyl pyrrolidone are added in agitated kettle and carry out revolution stirring 1h
Active matter solution is obtained, the speed of revolution is 25rpm；Conductive agent carbon black is added in active matter solution again and carries out revolution stirring
The speed of 1h, revolution are 25rpm；
The obtained glues of step S1 are added in step S2 by S3 carries out vacuum machine stirring 2h, and the speed of stirring is revolution
Speed be 25rpm, rotation linear velocity be 18m/s, vacuum degree be -0.085Mpa, you can lithium ion cell electrode is prepared
Slurry.
In above step, tertiary cathode material, carbon black, Kynoar three weight ratio be 95:2:3；N- methyl
The quality of pyrrolidones is the 42% of tertiary cathode material quality.
Embodiment 3
A kind of preparation method of lithium ion battery electrode sizing agent, includes the following steps：
S1：Binder Kynoar is uniformly mixed with the 45% of solvent N-methyl pyrilidone volume, is prepared
Glue；
S2：By tertiary cathode material (Ni：Co：Mn=8:1:1) it is added to stirring with residual solvent N-Methyl pyrrolidone
Revolution stirring 0.8h is carried out in pot and obtains active matter solution, and the speed of revolution is 50rpm；Active matter is added in conductive agent carbon black again
Revolution stirring 0.5h is carried out in solution, the speed of revolution is 60rpm；
The obtained glues of step S1 are added in step S2 by S3 carries out vacuum machine stirring 1h, and the speed of stirring is revolution
Speed be 35rpm, rotation linear velocity be 25m/s, vacuum degree be -0.1Mpa, you can be prepared lithium ion cell electrode slurry
Material.
In above step, tertiary cathode material (Ni：Co：Mn=8:1:1), carbon black, Kynoar three weight it
Than being 96:2:2；The quality of N-Methyl pyrrolidone is the 60% of tertiary cathode material quality.
Embodiment 4
A kind of preparation method of lithium ion battery electrode sizing agent, includes the following steps：
S1：Polyfluortetraethylene of binding element is uniformly mixed with the solvent N-methyl pyrilidone of half, glue is prepared；
S2：Active matter LiFePO4 is added in agitated kettle revolve round the sun with the other half solvent N-methyl pyrilidone and is stirred
It mixes 0.5h and obtains active matter solution, the speed of revolution is 20rpm；Conductive agent carbon nanotube is added in active matter solution again and is carried out
The speed of revolution stirring 1h, revolution are 20rpm；
S3：The obtained glues of step S1 are added in step S2 and carry out vacuum machine stirring 2h, the speed of stirring is public affairs
The speed turned is 20rpm, and rotation linear velocity is 15m/s, and vacuum degree is -0.085Mpa, you can lithium ion battery battery is prepared
Pole slurry.
In above step, LiFePO4, carbon nanotube, polytetrafluoroethylene (PTFE) three weight ratio be 94:3:3；N- methyl
The quality of pyrrolidones is the 55% of LiFePO4 quality.
Embodiment 5
A kind of preparation method of lithium ion battery electrode sizing agent, includes the following steps：
S1：Binder sodium carboxymethylcellulose is uniformly mixed with the solvent N-methyl pyrilidone of half, is prepared
Glue；
S2：By active matter tertiary cathode material (Ni：Co：Mn=4:2:4) add with the other half solvent N-methyl pyrilidone
Enter into agitated kettle to carry out revolution stirring 0.5h and obtain active matter solution, the speed of revolution is 20rpm；Again by conductive agent carbon fiber
It is added in active matter solution and carries out revolution stirring 1h, the speed of revolution is 20rpm；
S3：The obtained glues of step S1 are added in step S2 and carry out vacuum machine stirring 2h, the speed of stirring is public affairs
The speed turned is 20rpm, and rotation linear velocity is 15m/s, and vacuum degree is -0.085Mpa, you can lithium ion battery battery is prepared
Pole slurry.
In above step, tertiary cathode material (Ni：Co：Mn=4:2:4), carbon fiber, sodium carboxymethylcellulose three
Weight ratio is 93:3:4；The quality of N-Methyl pyrrolidone is the 50% of LiFePO4 quality.
The viscosity and fineness test result for the lithium ion battery electrode sizing agent that the above various embodiments is prepared such as 1 institute of table
Show：
Table 1
The lithium ion battery electrode sizing agent that the above various embodiments is prepared is further prepared into electrode and is assembled into lithium
Ion battery, process are as follows：It is prepared into battery through roll-in-cutting-film-making-winding-encapsulation-baking-fluid injection-chemical conversion-partial volume, and
Test the cycle performance that obtained lithium ion battery discharges in 2C chargings 5C, the results showed that battery performance is excellent, is recycling 900 weeks
Later, capacity retention ratio is still maintained at 95% or more, and multiplying power, cycle and pressure drop are significantly improved.
The above-mentioned detailed description carried out to a kind of preparation method of lithium ion battery electrode sizing agent with reference to embodiment, is explanation
Property without being restrictive, several embodiments can be enumerated according to limited range, therefore of the invention overall not departing from
Change and modification under design, should belong within protection scope of the present invention.
Claims (10)
1. a kind of preparation method of lithium ion battery electrode sizing agent, which is characterized in that include the following steps：
S1：Binder is uniformly mixed with the 40~50% of solvent volume, glue is prepared；
S2：Active matter and residual solvent are subjected to 0.5~1h of revolution stirring and obtain active matter solution；Activity is added in conductive agent again
0.5~1h of revolution stirring is carried out in object solution；
S3：By the obtained glues of step S1 be added in step S2 carry out vacuum machine stir 1~3h, you can be prepared lithium from
Sub- battery electrode paste.
2. preparation method according to claim 1, it is characterised in that：The active matter, conductive agent, binder three weight
The ratio between amount is (90~97)：(1~5)：(2~5).
3. preparation method according to claim 1 or 2, it is characterised in that：The weight of the solvent is the active matter weight
The 40~60% of amount.
4. preparation method according to claim 1 or 2, it is characterised in that：In the step S2, the speed of revolution is 20~
60rpm。
5. preparation method according to claim 1 or 2, it is characterised in that：In the step S3, the ginseng of vacuum machine stirring
Number is：Revolution speed is 20~60rpm, and rotation linear velocity is 10~25m/s, and vacuum degree is -0.1~-0.085MPa.
6. preparation method according to claim 1 or 2, it is characterised in that：The active matter includes LiFePO4 or ternary
Positive electrode.
7. preparation method according to claim 1 or 2, it is characterised in that：The binder is Kynoar, polytetrafluoro
Ethylene, butadiene-styrene rubber, sodium carboxymethylcellulose it is one or more.
8. preparation method according to claim 1 or 2, it is characterised in that：The conductive agent is carbon black, carbon fiber, graphite
Alkene, carbon nanotube, the one or several kinds of electrically conductive graphite.
9. preparation method according to claim 1 or 2, it is characterised in that：The solvent is N-Methyl pyrrolidone.
10. the lithium ion battery electrode sizing agent that preparation method according to claim 1 is prepared.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109142149A (en) * | 2018-09-04 | 2019-01-04 | 陕西煤业化工技术研究院有限责任公司 | A method of detection battery slurry dispersion stabilization |
| CN110190249A (en) * | 2019-04-19 | 2019-08-30 | 合肥国轩高科动力能源有限公司 | A kind of conjunction paste-making method of silicon-carbon cathode |
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Application publication date: 20180828 |