CN111081984A - Preparation method of battery slurry and battery slurry - Google Patents
Preparation method of battery slurry and battery slurry Download PDFInfo
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- CN111081984A CN111081984A CN201911413102.5A CN201911413102A CN111081984A CN 111081984 A CN111081984 A CN 111081984A CN 201911413102 A CN201911413102 A CN 201911413102A CN 111081984 A CN111081984 A CN 111081984A
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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
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/5825—Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
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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
-
- 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
-
- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a battery slurry preparation method and a battery slurry, which comprise the following steps: s1: mixing lithium iron phosphate powder and adhesive powder to obtain a mixed material A; s2: adding a solvent, a suspending agent and cooling water into the mixed material A, and mixing to obtain a mixed material B; s3: adding a precipitator into the mixed material B, mixing and filtering to obtain a mixed material C; s4: scraping the mixed material C to obtain a mixed material D; s5: adding a conductive agent into the mixed material D, mixing, dispersing and extruding to obtain a mixed material E; s6: and (5) carrying out vacuum defoaming and vacuum drying on the mixed material E to obtain the battery slurry. According to the invention, the suspending agent is added into the stirring tank for preparing the lithium iron phosphate slurry, and the precipitator is added after stirring and filtering are carried out, so that the prepared lithium iron phosphate slurry has a good dispersing effect and is uniformly mixed, the batching process is simplified, and the labor cost and the energy consumption are saved.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of batteries, in particular to a battery slurry preparation method and a battery slurry.
[ background of the invention ]
With the wide application and rapid development of lithium ion batteries, people have higher and higher performance requirements on the lithium ion batteries, and the lithium ion batteries are required to have higher capacity, better capacity retention rate in repeated charging and discharging processes, good cycle performance and longer service life. The anode is the most important component of the lithium ion battery, and the preparation of the anode slurry directly influences the performance of the lithium ion battery.
At present, a binder is usually dissolved in advance in lithium iron phosphate cathode slurry, and a mode of dispersing a conductive agent preferentially to disperse lithium iron phosphate is adopted, that is, after lithium iron phosphate powder and the binder are dissolved in a stirring tank, a part of solvent is added, then the conductive agent is added and stirred, then the rest of solvent is added, and after all the solvent is added, high-speed dispersion is performed to obtain the slurry. However, because the specific surface area of the conductive agent is large, the liquid absorption property is strong, after the conductive agent is added into the solvent, the anode slurry is pasty, the particle size of the lithium iron phosphate is small, the D50 is only a few micrometers, the agglomeration is easy to occur, the dispersion time of the anode slurry is long, the energy consumption is large, and the comprehensive cost is high.
In view of the above, it is desirable to provide a method for preparing a battery paste and a battery paste to overcome the above-mentioned drawbacks.
[ summary of the invention ]
The invention aims to provide a battery slurry preparation method and a battery slurry, which have good battery slurry dispersion effect and are uniformly mixed.
In order to achieve the above object, the present invention provides a method for preparing a battery paste, comprising:
s1: mixing lithium iron phosphate powder and adhesive powder to obtain a mixed material A;
s2: adding a solvent, a suspending agent and cooling water into the mixed material A, and mixing to obtain a mixture material B;
s3: adding a precipitator into the mixed material B, mixing and filtering to obtain a mixed material C;
s4: scraping the mixed material C to obtain a mixed material D;
s5: adding a conductive agent into the mixed material D, mixing, dispersing and extruding to obtain a mixture material E;
s6: and (5) carrying out vacuum defoaming and vacuum drying on the mixed material E to obtain the battery slurry.
In a preferred embodiment, in S1, the lithium iron phosphate powder and the binder powder are added into a stirring tank, and the first stirring and mixing are performed, where the rotation speed of the stirring tank is: rotating at 0-700rpm, revolving at 0-40rpm, and stirring for 40-50 min.
In a preferred embodiment, in S2, the solvent, the suspending agent and the cooling water are added to the stirring tank of the mixture a for the second stirring and mixing, and the rotation speed of the stirring tank is: rotating at 0-1900rpm and revolving at 0-40rpm, and stirring for 30-110 min.
In a preferred embodiment, in S3, adding a precipitant into a stirring tank of the mixture B, and performing a third stirring and mixing, wherein the rotation speed of the stirring tank is: rotating at 1800rpm and revolving at 30rpm for 100min, stirring for the third time, and filtering the mixed material; the precipitant is ammonia water.
In a preferred embodiment, in S4, the scraping is a repeated scraping process.
In a preferred embodiment, in S5, the conductive agent is added into the stirring tank of the mixture D, and the fourth stirring and mixing is performed, where the rotation speed of the stirring tank is: rotating at 1200rpm, revolving at 30rpm, and stirring for 60 min; the conductive agent is one or more of carbon black, carbon fiber, carbon nanotube and graphite.
In a preferred embodiment, in the S5, the dispersion time is 0.5 to 60 minutes, and/or the extrusion time is 0.5 to 60 minutes.
In a preferred embodiment, in the step S6, the vacuum degree is-0.095 to-0.001 MPa, the vacuum defoaming time is 30min, and the vacuum drying time is 30 min.
In a preferred embodiment, the solvent is one or more of water, heterocyclic compounds and ketone solvents.
The invention also provides battery slurry prepared by the preparation method of the battery slurry.
Compared with the prior art, the suspending agent is added into the stirring tank for preparing the lithium iron phosphate slurry, and the precipitator is added after stirring and filtering, so that the prepared lithium iron phosphate slurry has a good dispersing effect and is uniformly mixed, the batching process is simplified, and the labor cost and the energy consumption are saved. The lithium iron phosphate slurry prepared by the method is used as an active material, so that the internal resistance, the multiplying power, the low temperature and the cycle performance of the lithium ion battery are good.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantageous effects of the present invention more apparent, the present invention is further described in detail with reference to the following detailed description. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides a preparation method of battery slurry, which comprises the following steps:
s1: mixing lithium iron phosphate powder and adhesive powder to obtain a mixed material A; adding lithium iron phosphate powder and adhesive powder into a stirring tank, and stirring and mixing for the first time, wherein the rotating speed of the stirring tank is as follows: rotating at 0-700rpm, revolving at 0-40rpm, and stirring for 40-50 min.
S2: adding a solvent, a suspending agent and cooling water into the mixed material A, and mixing to obtain a mixture material B; adding a solvent, a suspending agent and cooling water into a stirring tank of the mixed material A to perform secondary stirring and mixing, wherein the rotating speed of the stirring tank is as follows: rotating at 0-1900rpm, revolving at 0-40rpm, and stirring for 30-110 min. Heating and uniformly stirring the solvent, pouring the solvent into a stirring tank, adding the suspending agent and cooling water into the stirring tank, stirring and mixing for the second time, adding a proper amount of the solvent to wet the mixed dry powder, ensuring that the dry powder is completely wetted according to the different added solvent dosage (65-75 percent of solid content during kneading) of the particle size and the specific surface area of the supplied material of the active substance, reaching the wetting critical point, scraping the material twice during stirring for the second time, and ensuring that the slurry attached to the wall of the stirring tank and the material on the stirring paddle are fully kneaded and stirred.
S3: adding a precipitator into the mixed material B, mixing and filtering to obtain a mixed material C; adding a precipitator into the stirring tank of the mixed material B, stirring and mixing for the third time, wherein the rotating speed of the stirring tank is as follows: rotating at 1800rpm and revolving at 30rpm for 100min, stirring for the third time, and filtering the mixed material; the precipitant is ammonia. The slurry is precipitated, and the excessive solvent is removed in a filtering mode, because if the solvent is excessive, the slurry flows easily, the shearing force action effect of the stirring paddle is reduced, and the kneading stirring cannot play a role in crushing and aggregating by kneading force, so that the quality of the battery slurry is reduced.
S4: scraping the mixed material C to obtain a mixed material D; scraping is a process of repeatedly scraping. And stirring the filtered slurry again, scraping the slurry after stirring, repeatedly stirring and scraping the slurry, and increasing the viscosity of the slurry.
S5: adding a conductive agent into the mixed material D, mixing, dispersing and extruding to obtain a mixture material E; adding a conductive agent into the stirring tank of the mixed material D, and stirring and mixing for the fourth time, wherein the rotating speed of the stirring tank is as follows: rotating at 1200rpm, revolving at 30rpm, and stirring for 60 min; the conductive agent is one or more of carbon black, carbon fiber, carbon nanotube and graphite; the dispersion time is 0.5 to 60 minutes, and/or the extrusion time is 0.5 to 60 minutes. The slurry is stirred and dispersed at a high speed in a vacuum state, the time distribution is reasonable, and the slurry mixing degree is better under the action of high-speed stirring and high shearing force.
Generally, the longer the stirring time is, the better the viscosity of the slurry is, and the slurry can be repeatedly stirred and scraped, so that the viscosity of the slurry is greatly increased
S6: performing vacuum defoaming and vacuum drying on the mixed material E to obtain battery slurry; the vacuum degree is-0.095 to-0.001 MPa, the vacuum defoaming time is 30min, and the vacuum drying time is 30 min. And defoaming and drying under the vacuum degree condition to enable the viscosity of the slurry to meet the requirement, discharging the slurry after the viscosity is tested to be qualified (adjusting the viscosity of the slurry to 2500-4000 mPa · s), and obtaining the battery slurry meeting the requirement.
The solvent is one or more of water, a heterocyclic compound and a ketone solvent.
The first embodiment is as follows:
mixing 50g of lithium iron phosphate and 2g of adhesive powder at the speed of rotation of 200rpm and revolution of 20rpm of a stirring tank for 40 min;
adding 10 percent polyacrylic acid and polyacrylonitrile solution and 10 percent polyacrylic acid solution into 100g of heated distilled water, uniformly stirring, pouring the stirred solvent, suspending agent and cooling water into a stirring tank, stirring for the second time at the speed of rotation 1200rpm and revolution 30rpm of the stirring tank, and stirring for 90 min;
adding precipitant (ammonia water) to stir and mix for the third time at the rotation speed of 1800rpm and the revolution speed of 30rpm of the stirring tank, wherein the stirring time is 100 min;
scraping the mixed material after the third stirring for multiple times;
adding conductive agent (graphite), stirring at rotation speed of 1200rpm and revolution speed of 30rpm for 60 min; the dispersion is carried out for 30 minutes, and/or the extrusion is carried out for 30 minutes; and (3) under the vacuum degree of-0.095 MPa, the vacuum defoaming time is 30min, and the vacuum drying time is 30min, so that the battery slurry is obtained.
Example two:
mixing 50g of lithium iron phosphate and 2g of adhesive powder at the rotation speed of 400rpm and the revolution speed of 40rpm of a stirring tank for 50 min;
adding 5 percent polyacrylic acid and polyacrylonitrile solution with the weight of 10g and 5 percent polyacrylic acid solution with the weight of 10g into 100g of heated distilled water, uniformly stirring, pouring the stirred solvent, suspending agent and cooling water into a stirring tank, stirring for the second time at the rotation speed of 1800rpm and the revolution speed of 20rpm of the stirring tank, and stirring for 60 min;
adding precipitant (ammonia water) to stir and mix for the third time at the rotation speed of 1800rpm and the revolution speed of 30rpm of the stirring tank, wherein the stirring time is 100 min;
scraping the mixed material after the third stirring for multiple times;
adding conductive agent (carbon black, carbon fiber, carbon nanotube, graphite), stirring, and mixing
In conclusion, the suspending agent is added into the stirring tank for preparing the lithium iron phosphate slurry, and the precipitator is added after stirring and filtering, so that the prepared lithium iron phosphate slurry has a good dispersing effect and is uniformly mixed, the batching process is simplified, and the labor cost and the energy consumption are saved. The lithium iron phosphate slurry prepared by the method is used as an active material, so that the internal resistance, the multiplying power, the low temperature and the cycle performance of the lithium ion battery are good.
The invention is not limited solely to the description and embodiments, and additional advantages and modifications will readily occur to those skilled in the art, since the invention is not limited to the specific details, representative apparatus, and equivalents without departing from the spirit and scope of the general concept as defined by the appended claims and their equivalents.
Claims (10)
1. A method of preparing a battery paste, comprising:
s1: mixing lithium iron phosphate powder and adhesive powder to obtain a mixed material A;
s2: adding a solvent, a suspending agent and cooling water into the mixed material A, and mixing to obtain a mixed material B;
s3: adding a precipitator into the mixed material B, mixing and filtering to obtain a mixed material C;
s4: scraping the mixed material C to obtain a mixed material D;
s5: adding a conductive agent into the mixed material D, mixing, dispersing and extruding to obtain a mixed material E;
s6: and (5) carrying out vacuum defoaming and vacuum drying on the mixed material E to obtain the battery slurry.
2. The method for preparing battery paste according to claim 1, wherein in S1, the lithium iron phosphate powder and the binder powder are added into a stirring tank, and the first stirring and mixing are performed, wherein the rotation speed of the stirring tank is as follows: rotating at 0-700rpm, revolving at 0-40rpm, and stirring for 40-50 min.
3. The method for preparing battery slurry according to claim 2, wherein in the step S2, the solvent, the suspending agent and the cooling water are added into a stirring tank of the mixture a for second stirring and mixing, and the rotation speed of the stirring tank is as follows: rotating at 0-1900rpm, revolving at 0-40rpm, and stirring for 30-110 min.
4. The method for preparing battery slurry according to claim 3, wherein in the step S3, the precipitant is added into a stirring tank of the mixture B, and the stirring and mixing are carried out for the third time, wherein the rotation speed of the stirring tank is as follows: rotating at 1800rpm and revolving at 30rpm for 100min, stirring for the third time, and filtering the mixed material; the precipitant is ammonia water.
5. The method for preparing battery slurry according to claim 4, wherein in the S4, the scraping is a repeated scraping process.
6. The method for preparing battery slurry according to claim 5, wherein in the step S5, the conductive agent is added into a stirring tank of the mixed material D, and fourth stirring and mixing are carried out, wherein the rotation speed of the stirring tank is as follows: rotating at 1200rpm, revolving at 30rpm, and stirring for 60 min; the conductive agent is one or more of carbon black, carbon fiber, carbon nanotube and graphite.
7. The method for producing a battery paste according to claim 6, wherein in the S5, the dispersion time is 0.5 to 60 minutes, and/or the extrusion time is 0.5 to 60 minutes.
8. The method for producing battery paste according to claim 7, wherein the degree of vacuum of S6 is-0.095 to-0.001 MPa, the vacuum degassing time is 30min, and the vacuum drying time is 30 min.
9. The method for preparing battery paste according to claim 8, wherein the solvent is one or more of water, heterocyclic compounds and ketone solvents.
10. A battery paste produced by the method for producing a battery paste according to any one of claims 1 to 9.
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| CN201911413102.5A CN111081984A (en) | 2019-12-31 | 2019-12-31 | Preparation method of battery slurry and battery slurry |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113328097A (en) * | 2021-07-06 | 2021-08-31 | 深圳一特科技有限公司 | Improved conductive glue solution for lithium ion battery anode and preparation method and application thereof |
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Application publication date: 20200428 |