CN114220970B - Lithium ion battery anode slurry and preparation method thereof - Google Patents
Lithium ion battery anode slurry and preparation method thereof Download PDFInfo
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- CN114220970B CN114220970B CN202111530969.6A CN202111530969A CN114220970B CN 114220970 B CN114220970 B CN 114220970B CN 202111530969 A CN202111530969 A CN 202111530969A CN 114220970 B CN114220970 B CN 114220970B
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 24
- 239000006256 anode slurry Substances 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000006185 dispersion Substances 0.000 claims abstract description 49
- 238000003756 stirring Methods 0.000 claims abstract description 33
- 239000002033 PVDF binder Substances 0.000 claims abstract description 24
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000011230 binding agent Substances 0.000 claims description 24
- 239000007787 solid Substances 0.000 claims description 24
- 239000002245 particle Substances 0.000 claims description 17
- 239000000843 powder Substances 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- HCDGVLDPFQMKDK-UHFFFAOYSA-N hexafluoropropylene Chemical group FC(F)=C(F)C(F)(F)F HCDGVLDPFQMKDK-UHFFFAOYSA-N 0.000 claims description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 10
- 239000002904 solvent Substances 0.000 claims description 8
- 239000011267 electrode slurry Substances 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 239000011812 mixed powder Substances 0.000 claims description 6
- 239000007774 positive electrode material Substances 0.000 claims description 5
- 125000000524 functional group Chemical group 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000000178 monomer Substances 0.000 claims description 4
- 239000006230 acetylene black Substances 0.000 claims description 2
- 239000003273 ketjen black Substances 0.000 claims description 2
- 239000002002 slurry Substances 0.000 abstract description 53
- 230000008569 process Effects 0.000 abstract description 12
- 239000011248 coating agent Substances 0.000 abstract description 5
- 238000000576 coating method Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 4
- 238000007873 sieving Methods 0.000 abstract description 4
- 230000003993 interaction Effects 0.000 abstract description 3
- 230000001934 delay Effects 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 238000004062 sedimentation Methods 0.000 abstract description 2
- 239000000853 adhesive Substances 0.000 abstract 1
- 230000001070 adhesive effect Effects 0.000 abstract 1
- 230000008859 change Effects 0.000 description 9
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 239000000499 gel Substances 0.000 description 8
- 229910004764 HSV900 Inorganic materials 0.000 description 6
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical group CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 5
- 239000013543 active substance Substances 0.000 description 4
- 238000007580 dry-mixing Methods 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000001879 gelation Methods 0.000 description 2
- 229910004761 HSV 900 Inorganic materials 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical compound [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000011884 anode binding agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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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
-
- 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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
- H01M4/622—Binders being polymers
- H01M4/623—Binders being polymers fluorinated polymers
-
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention provides a lithium ion battery anode slurry and a preparation method thereof, wherein two PVDF adhesives are adopted for matching, the stirring process is further optimized on the basis of traditional dry stirring, one-step pre-dispersion and two-step high-low-speed dispersion matching are added on the basis of the dry stirring, the states of the pre-dispersion and low-speed dispersion slurry are controlled, the shipment viscosity is controlled, the uniform dispersion performance of the lithium ion battery anode slurry can be improved, and the slurry stability is greatly improved. The method has the advantages of simple process route and easy implementation, delays or solves the problem of gel caused by interaction with the positive electrode main material in use of the domestic PVDF, ensures the stability of the slurry for a long time and moderate viscosity, and solves the problems of weak slurry shipment and sieving capability, easy sedimentation and blockage of the filter element, coating of pits and the like. And simultaneously, the shortage of the supply of imported raw materials is relieved, and the cost is reduced.
Description
Technical Field
The invention belongs to the field of new energy batteries, and particularly relates to positive electrode slurry of a lithium ion battery and a preparation method of the positive electrode slurry.
Background
The pulping of the lithium ion battery is in the first stage of the whole process, and the quality of the performance of the sizing agent directly affects the subsequent process, thereby affecting the performance of the lithium ion battery. The anode of the lithium ion battery takes polyvinylidene fluoride (PVDF) as a main oil-soluble binder, and polyvinylidene fluoride is the most widely used anode binder of the lithium ion battery at present, and the weight ratio is more than 90%.
At present, along with the rapid development of electric vehicles and the structural influence of the iron-lithium market, supply gaps are continuously enlarged, and the price of products is also continuously increased. The current produced positive electrode slurry has the problem of slurry gel.
Disclosure of Invention
The invention aims to provide the lithium ion battery anode slurry and the preparation method thereof, and by adopting two PVDF binders for matching, the stirring process is designed, so that the dispersion uniformity of the lithium ion battery anode slurry can be improved, the slurry stability can be greatly improved, and the problem of anode slurry gel is solved.
The specific technical scheme of the invention is as follows:
the preparation method of the lithium ion battery anode slurry comprises the following steps:
1) Stirring and mixing the positive electrode active material, conductive carbon and a binder;
2) Adding a solvent into the mixed powder prepared in the step 1) to ensure that the solid content of the mixed powder is 70-75wt% and stirring and pre-dispersing the mixed powder;
3) Adding solvent to make its solid content be 60-70wt%, stirring and dispersing;
4) Adding solvent to make its solid content be 53-67wt%, stirring and dispersing;
5) And (5) defoaming.
The mass ratio of the positive electrode active material to the conductive carbon to the binder powder in the step 1) is 95-98:1-3:1-3;
the positive electrode active material is selected from lithium iron phosphate;
the conductive carbon is at least one selected from conductive carbon black, ketjen black, acetylene black, large-particle graphite powder and small-particle graphite powder;
the binder is polyvinylidene fluoride and consists of PVDF1 and PVDF2, wherein the PVDF1 is PVDF containing hexafluoropropylene groups, fluoroesters groups or modified functional groups of one or more MMA monomers, and the particle size D 50 At 105-130 μm; the PVDF2 is of particle size D 50 < 15 μm containing only-CF 2 and-CH 2 PVDF of peak; preferably, PVDF2 model HSV900; in the binder, the PVDF1 accounts for 10-50% by mass; the PVDF2 accounts for 90-50% by mass.
In the step 1), the stirring and mixing specifically comprises the following steps: the dispersing revolution speed is 20-30rpm, the rotation speed is 500-800rpm, and the dispersing time is 15-45min;
in the step 2), the conditions of stirring and pre-dispersing are as follows: the dispersion revolution speed is 10-20rpm, the rotation speed is 100-300rpm, and the dispersion time is 10-40min; the step is to pre-soak the positive electrode main material, start stirring at the same time, disperse and mix evenly, and then form loose and non-agglomerated powder particles.
In the step 3), the stirring and dispersing are carried out at a low speed, the revolution speed is 15-30rpm, the rotation speed is 300-800rpm, and the dispersing time is 40-80min; after being fully and uniformly dispersed under the stirring and shearing actions, the slurry is in a state of plasticine.
In the step 4), stirring and dispersing are carried out at a high speed, wherein the revolution speed is 15-30rpm, the rotation speed is 500-1800rpm, and the dispersing time is 90-240min; after this step, the viscosity was measured and the viscosity of the slurry was controlled at 6000-15000mPa.s.
The solvent is N-methyl pyrrolidone NMP.
The defoaming in the step 5) is specifically as follows: the dispersion revolution speed was 10rpm, the rotation speed was 0rpm, and the dispersion time was 30min.
The lithium ion battery anode slurry provided by the invention is prepared by adopting the method.
The inventors found that PVDF, especially modified functional groups containing hexafluoropropylene group, fluoroesters group, MMA monomer, etc., on the market at present, have problems of slurry gelation caused by interaction with the positive electrode host material. The invention is characterized by mixing the particle diameter D 50 Less than 15 μm, less acidic, containing only-CF 2 and-CH 2 Peak PVDF, such as HSV900, with a PVDF ratio of 5 or above, and controlling better dispersion of the stirring process to delay the problem of interacting slurry gels when PVDF1 is collocated with the cathode host.
According to the stirring process, dry powder is mixed, and then the stirring mode of high solid content and low solid content is combined. When the solid content is high, the powder is wetted, the rotating speed is low in the stage, and the particles must be wetted by a solvent medium, so that the particles are well immersed into a liquid phase; low solid content stirring is carried out in two steps, dispersion 1: the solid particle aggregate is separated and dispersed under the action of mechanical force, so that the dispersed particles are stable and prevented from re-agglomerating; dispersion 2: the particles or smaller agglomerates are shielded from van der Waals force under the action of electrostatic repulsive force and steric hindrance repulsive force, so that the particles are not aggregated, the uniform distribution of suspended particles is maintained, and the stability of the slurry is improved.
The invention solves the problems of quick gelation, weak sieving capability, influence on coating processing and use and the like of PVDF in the using process, and the invention provides the positive electrode slurry and the preparation method thereof. The positive electrode is matched with the mixed PVDF, and the stirring process and the shipment viscosity are controlled, so that the obtained positive electrode slurry has proper shipment slurry viscosity, good dispersibility and better sieving, and the slurry stability is kept for a long time.
Compared with the prior art, the invention adopts two PVDF binders to be matched for use, the stirring process is further optimized on the basis of the traditional dry stirring, one-step pre-dispersing and two-step high-low speed dispersing matching are added on the basis of the dry stirring, the states of pre-dispersing and low-speed dispersing slurry are controlled, the shipment viscosity is controlled, the uniform dispersing performance of the lithium ion battery anode slurry can be improved, and the stability of the slurry can be greatly improved. The method has the advantages of simple process route and easy implementation, delays or solves the problem of gel caused by interaction with the positive electrode main material in use of PVDF containing one or more modified functional groups of hexafluoropropylene groups, fluoroesters groups or MMA monomers, ensures the stability of the slurry for a long time, has moderate viscosity, and solves the problems of weak slurry shipment and sieving capability, easy sedimentation and blockage of a filter element, coating of pits and the like. And simultaneously, the shortage of the supply of imported raw materials is relieved, and the cost is reduced.
Drawings
FIG. 1 shows viscosity change during 42h of standing of the slurry of example 1;
FIG. 2 is a state of the slurry of example 1 after standing for 42 hours;
FIG. 3 is a schematic illustration of the process flow of the present invention;
FIG. 4 shows the viscosity change of the slurry of example 2 after being left to stand for 48 hours;
FIG. 5 is a state of the slurry of example 2 after standing for 48 hours;
FIG. 6 shows viscosity change during 48h of slurry of example 3;
FIG. 7 is a state after the slurry of example 3 was left to stand for 48 hours;
FIG. 8 is a graph showing viscosity change during 48h of slurry stand in example 4;
FIG. 9 is a state of the slurry of example 4 after standing for 48 hours;
fig. 10 is a state after the slurry of comparative example 1 was left to stand for 1 hour;
FIG. 11 is a graph showing viscosity change during 2h of comparative example 2 slurry resting;
FIG. 12 is a state after the slurry of comparative example 2 was left to stand for 2 hours;
fig. 13 is a state after the slurry of comparative example 3 was left to stand for 1 hour.
Detailed Description
Example 1
The preparation method of the lithium ion battery anode slurry comprises the following steps:
1) Weighing 97 parts of lithium iron phosphate, 1 part of conductive carbon black powder and 2 parts of binder serving as positive electrode active substances, wherein the binder is PVDF1 modified by hexafluoropropylene groups in mass ratio of PVDF 2=5:5 of model HSV900, the lithium iron phosphate, the conductive carbon black powder and the binder are added into a double-planetary stirring tank for dry mixing, the dispersion revolution speed is 20rpm, the rotation speed is 500rpm, and the dispersion time is 30min;
2) N-methyl pyrrolidone NMP is added for pre-dispersing, the dispersing revolution speed is 10rpm, the rotation speed is 200rpm, the dispersing time is 30min, and the semi-dry powdery slurry with 73 percent of solid content (mass percent content) is formed;
3) Adding NMP to disperse, wherein the revolution speed is 20rpm, the rotation speed is 500rpm, the dispersion time is 60min, and the solid content is reduced to 68%, so as to form plasticine-like slurry;
4) Adding NMP to disperse, wherein the revolution speed is 25rpm, the rotation speed is 1500rpm, the dispersion time is 180min, and the solid content is reduced to 64%;
5) The defoaming was carried out at a dispersion revolution speed of 10rpm, a rotation speed of 0rpm and a dispersion time of 30min. The slurry was adjusted to a suitable viscosity of 6000-15000mpa.s.
Fig. 1 shows viscosity change during the standing of the slurry of example 1 for 42 hours, and the state of the slurry after standing for 42 hours is shown in fig. 2.
Example 2
The preparation method of the lithium ion battery anode slurry comprises the following steps:
1) Weighing 97 parts of lithium iron phosphate, 1 part of conductive carbon black powder and 2 parts of binder serving as positive electrode active substances according to parts by mass; the binder consists of PVDF1 with a mass ratio of PVDF 2=4:6 of model HSV900 containing hexafluoropropylene groups, lithium iron phosphate, conductive carbon black powder and binder are added into a double-planetary stirring tank for dry mixing, the dispersion revolution speed is 30rpm, the rotation speed is 800rpm, and the dispersion time is 45min;
2) Adding NMP to perform pre-dispersion, wherein the dispersion revolution speed is 10rpm, the rotation speed is 200rpm, and the dispersion time is 30min, so as to form semi-dry powdery slurry with the solid content of 72% (mass percent);
3) Adding NMP to disperse, wherein the revolution speed is 20rpm, the rotation speed is 500rpm, the dispersion time is 60min, and the solid content is reduced to 67%, so as to form plasticine-like slurry;
4) Adding NMP to disperse, wherein the revolution speed is 25rpm, the rotation speed is 1500rpm, the dispersion time is 180min, and the solid content is reduced to 62%;
5) Deaeration, dispersion revolution speed of 10rpm, rotation speed of 0rpm, dispersion time of 30min, and adjustment of slurry to proper viscosity.
Fig. 4 shows viscosity change during the 48-hour standing of the slurry of example 2, and fig. 5 shows the slurry of example 2 after the 48-hour standing.
Example 3
The preparation method of the lithium ion battery anode slurry comprises the following steps:
1) Weighing 97 parts of lithium iron phosphate, 1 part of conductive carbon black powder and 2 parts of binder serving as positive electrode active substances according to parts by mass, wherein the binder comprises, by mass, PVDF1 containing hexafluoropropylene groups, PVDF 2=3:7 of model HSV900, adding the lithium iron phosphate, the conductive carbon black powder and the binder into a double-planetary stirring tank, and dry-mixing, wherein the dispersion revolution speed is 30rpm, the rotation speed is 600rpm and the dispersion time is 35min;
2) After the step 1), adding NMP to perform pre-dispersion, wherein the dispersion revolution speed is 10rpm, the rotation speed is 200rpm, and the dispersion time is 30min, so as to form semi-dry powdery slurry with the solid content of 70% (mass percentage);
3) Adding NMP to disperse, wherein the revolution speed is 20rpm, the rotation speed is 500rpm, the dispersion time is 60min, and the solid content is reduced to 65%, so as to form plasticine-like slurry;
4) Adding NMP to disperse, wherein the revolution speed of dispersion is 25rpm, the rotation speed is 1600rpm, the dispersion time is 200min, and the solid content is reduced to 60%;
5) Deaeration, rotation speed of 10rpm, rotation speed of 0rpm, and dispersion time of 30min were carried out to adjust the slurry to an appropriate viscosity.
Fig. 6 shows viscosity change during the 48-hour standing of the slurry of example 3, and fig. 7 shows the slurry of example 3 after the 48-hour standing.
Example 4
The preparation method of the lithium ion battery anode slurry comprises the following steps:
1) Weighing 97 parts of lithium iron phosphate, 1 part of conductive carbon black powder and 2 parts of binder serving as positive electrode active substances according to parts by mass, wherein the binder comprises PVDF1 containing hexafluoropropylene groups in a mass ratio of PVDF 2=2:8 of model HSV900, adding the lithium iron phosphate, the conductive carbon black powder and the binder into a double-planetary stirring tank, and dry-mixing, wherein the dispersion revolution speed is 25rpm, the rotation speed is 700rpm and the dispersion time is 35min;
2) Adding NMP to perform pre-dispersion, wherein the revolution speed of dispersion is 15rpm, the rotation speed of dispersion is 300rpm, and the dispersion time is 30min, so as to form semi-dry powdery slurry with the solid content of 72% (mass percent);
3) Adding NMP to disperse, wherein the revolution speed is 25rpm, the rotation speed is 600rpm, the dispersion time is 60min, and the solid content is reduced to 68%, so as to form plasticine-like slurry;
4) Adding NMP to disperse, wherein the revolution speed of dispersion is 25rpm, the rotation speed is 1800rpm, the dispersion time is 200min, and the solid content is reduced to 62%;
5) Deaeration, dispersion revolution speed of 10rpm, rotation speed of 0rpm, dispersion time of 30min, and adjustment of slurry to proper viscosity.
Fig. 8 shows viscosity change during the 48-hour standing of the slurry of example 4, and fig. 9 shows the slurry of example 4 after the 48-hour standing.
The slurry prepared in the examples 1-4 has moderate shipment viscosity under the same solid content, is favorable for coating, and does not block a filter element filter screen during filtration; the slurry has good dispersibility, keeps the slurry stability for a long time, has no gel after 42-48 hours, and has good coating state.
Comparative example 1
The preparation method of the lithium ion battery anode slurry comprises the following steps: the difference from example 1 is that the binder is PVDF1 which contains purely hexafluoropropylene groups. As a result, fig. 10 shows a state in which the slurry of comparative example 1 was left to stand for 1 hour, and the gel was serious after 60 minutes of shipment.
Comparative example 2
The preparation method of the lithium ion battery anode slurry comprises the following steps: the difference from example 1 is that the binder consists of a mass ratio of PVDF1 containing hexafluoropropylene groups to PVDF 2=6:4 of model HSV 900. The shipment 2h shows gel, as shown in fig. 11 and 12.
Comparative example 3
The preparation method of the lithium ion battery anode slurry comprises the following steps: the difference from example 1 is that the binder is PVDF1 containing hexafluoropropylene groups, PVDF3 containing fluoroesters groups=5:5, and the result is a 1h gel at shipment. The results are shown in FIG. 13.
Claims (9)
1. The preparation method of the lithium ion battery anode slurry is characterized by comprising the following steps:
1) Stirring and mixing the positive electrode active material, conductive carbon and a binder;
2) Adding a solvent into the mixed powder prepared in the step 1) to ensure that the solid content of the mixed powder is 70-75wt% and stirring and pre-dispersing the mixed powder;
3) Adding solvent to make its solid content be 60-70wt%, stirring and dispersing;
4) Adding solvent to make its solid content be 53-67wt%, stirring and dispersing;
5) Defoaming is carried out;
the binder is polyvinylidene fluoride and consists of PVDF1 and PVDF2, wherein the PVDF1 is PVDF containing hexafluoropropylene groups, fluoroesters groups or modified functional groups of one or more MMA monomers, and the particle size D 50 At 105-130 μm; the PVDF2 is of particle size D 50 < 15 μm containing only-CF 2 and-CH 2 PVDF of peak.
2. The method according to claim 1, wherein the mass ratio of the positive electrode active material, the conductive carbon, and the binder powder in step 1) is 95 to 98:1-3:1-3.
3. The preparation method according to claim 1, wherein the binder comprises 10-50% of PVDF1 by mass; the PVDF2 accounts for 90-50% by mass.
4. The method according to claim 1, wherein the conductive carbon is at least one selected from the group consisting of conductive carbon black, ketjen black, acetylene black, large-particle graphite powder, and small-particle graphite powder.
5. The method according to claim 1, wherein in step 2), the condition of stirring pre-dispersion is: the dispersing revolution speed is 10-20rpm, the rotation speed is 100-300rpm, and the dispersing time is 10-40min.
6. The method according to claim 1, wherein in the step 3), the stirring and dispersing are performed at a low speed, the revolution speed is 15-30rpm, the rotation speed is 300-800rpm, and the dispersing time is 40-80min.
7. The method according to claim 1, wherein in the step 4), the stirring and dispersing are performed at a high speed, the revolution speed is 15-30rpm, the rotation speed is 500-1800rpm, and the dispersing time is 90-240min.
8. The method according to claim 1, wherein the viscosity of the positive electrode slurry of the lithium ion battery is controlled to be 6000-15000mpa.s.
9. A lithium ion battery positive electrode slurry prepared by the preparation method of any one of claims 1 to 8.
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| CN102034966B (en) * | 2004-10-06 | 2013-04-10 | 日本瑞翁株式会社 | Electrode composition, electrode, and battery |
| CN103959547B (en) * | 2011-09-29 | 2016-10-26 | 日立麦克赛尔株式会社 | Lithium secondary battery |
| WO2013129658A1 (en) * | 2012-03-02 | 2013-09-06 | 日本ゼオン株式会社 | Positive electrode for secondary battery, and secondary battery |
| CN106654166B (en) * | 2016-11-17 | 2019-04-26 | 浙江超威创元实业有限公司 | The homogenate technique and anode pole piece of lithium ion battery anode glue size, lithium ion battery |
| CN108336355B (en) * | 2017-01-17 | 2020-09-15 | 中航锂电（洛阳）有限公司 | Lithium ion battery anode slurry and preparation method thereof |
| CN107744767A (en) * | 2017-10-10 | 2018-03-02 | 中航锂电（江苏）有限公司 | A kind of lithium ion battery anode glue size process for dispersing |
| CN108281640B (en) * | 2018-01-31 | 2021-02-09 | 北京国能电池科技股份有限公司 | Batching process of lithium ion battery anode slurry, lithium ion battery anode plate and lithium ion battery |
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| CN109713306B (en) * | 2018-11-28 | 2021-11-05 | 桑德新能源技术开发有限公司 | Binder, positive electrode slurry, preparation method of positive electrode slurry and lithium ion battery |
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| CN112234157A (en) * | 2020-09-25 | 2021-01-15 | 双登集团股份有限公司 | Composite positive pole piece for solid-state battery and preparation method thereof |
| CN113036068A (en) * | 2020-12-11 | 2021-06-25 | 骆驼集团新能源电池有限公司 | Preparation method of anode slurry suitable for 12V start-stop power supply |
| CN112786864A (en) * | 2021-01-27 | 2021-05-11 | 深圳好电科技有限公司 | Lithium ion battery anode slurry and preparation method thereof |
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| CN112885983A (en) * | 2021-01-14 | 2021-06-01 | 天能帅福得能源股份有限公司 | Lithium ion battery positive electrode slurry homogenizing method |
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