CN112563483A - Positive active material slurry of lithium ion battery and preparation method - Google Patents
Positive active material slurry of lithium ion battery and preparation method Download PDFInfo
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- 239000002002 slurry Substances 0.000 title claims abstract description 58
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 32
- 239000007774 positive electrode material Substances 0.000 title claims abstract description 12
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000011230 binding agent Substances 0.000 claims abstract description 18
- 239000006258 conductive agent Substances 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000008367 deionised water Substances 0.000 claims abstract description 14
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 14
- 238000005303 weighing Methods 0.000 claims abstract description 9
- 239000011149 active material Substances 0.000 claims abstract description 8
- 238000004537 pulping Methods 0.000 claims abstract description 7
- 239000006185 dispersion Substances 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 9
- 229920001661 Chitosan Polymers 0.000 claims description 7
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 6
- 229910021389 graphene Inorganic materials 0.000 claims description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 235000010413 sodium alginate Nutrition 0.000 claims description 6
- 229940005550 sodium alginate Drugs 0.000 claims description 6
- 239000000661 sodium alginate Substances 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 4
- 239000000725 suspension Substances 0.000 claims description 4
- 229920002125 Sokalan® Polymers 0.000 claims description 2
- FRMOHNDAXZZWQI-UHFFFAOYSA-N lithium manganese(2+) nickel(2+) oxygen(2-) Chemical group [O-2].[Mn+2].[Ni+2].[Li+] FRMOHNDAXZZWQI-UHFFFAOYSA-N 0.000 claims description 2
- 230000003014 reinforcing effect Effects 0.000 claims 1
- 239000006183 anode active material Substances 0.000 abstract description 9
- 239000000463 material Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 239000011259 mixed solution Substances 0.000 description 9
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 8
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 239000007788 liquid Substances 0.000 description 8
- 229910052744 lithium Inorganic materials 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000000843 powder Substances 0.000 description 6
- 239000002904 solvent Substances 0.000 description 4
- 239000002033 PVDF binder Substances 0.000 description 3
- 239000013543 active substance Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000005056 compaction Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- BDKWOJYFHXPPPT-UHFFFAOYSA-N lithium dioxido(dioxo)manganese nickel(2+) Chemical compound [Mn](=O)(=O)([O-])[O-].[Ni+2].[Li+] BDKWOJYFHXPPPT-UHFFFAOYSA-N 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000011267 electrode slurry Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000011076 safety test Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
-
- 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
- H01M4/1391—Processes of manufacture of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
-
- 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
-
- 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
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
-
- 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
- H01M2004/021—Physical characteristics, e.g. porosity, surface area
-
- 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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
-
- 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)
- Inorganic Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
A preparation method of positive active material slurry of a lithium ion battery comprises the following steps: s1: weighing the active matter, the binder, the conductive agent and the deionized water according to the amount, adding the active matter, the binder, the conductive agent and the deionized water into a double-planet pulping machine together, and stirring for 1.5-3h under the conditions that the revolution speed is 48 revolutions per minute and the autodrive speed is 1700 revolutions per minute to prepare slurry, so that the viscosity of the slurry without mixing reaches 3000-15000 mPa.s; s2: and (4) dispersing the slurry obtained in the step S1 by using a high-speed dispersion machine under the condition that the rotating speed is 3000-6000 r/min until the viscosity reaches 3000-15000 mPa.s, thus obtaining the active material slurry of the positive electrode of the lithium ion battery. The slurry prepared by the preparation method of the lithium ion battery anode active material slurry still has the advantages of high stability and good fluidity in a high-humidity environment.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to anode active material slurry of a lithium ion battery, in particular to anode active material slurry of the lithium ion battery and a preparation method thereof.
[ background of the invention ]
With the development of mobile electronic devices, batteries are increasingly demanded, and therefore, higher requirements are made on the capacity, voltage, service life and use cost of the batteries. A lithium ion battery is a type of secondary battery (i.e., a rechargeable battery) that mainly operates by movement of lithium ions between a positive electrode and a negative electrode. However, the lithium ion batteries on the market have various defects of poor cell safety performance, low capacity per unit volume, low power and poor cycle performance, and the defects are caused by the unqualified viscosity of slurry for manufacturing the positive plate. Secondly, the pulping processing performance of the anode active matter of the existing lithium ion battery is unstable; particularly, the oiliness process nmp (low toxicity and flammability) of nickel cobalt lithium manganate is used as a solvent, PVDF is used as a binder, the requirement on the humidity of the production environment is high after the slurry is prepared, because the PVDF is agglomerated and fails after absorbing water, the slurry is easy to thicken and weaken in fluidity under a high humidity environment (more than or equal to 10% RH), the coating surface density is unstable, the adhesion of pole piece powder is worsened, and various problems are caused, such as the qualification rate of the produced product is lower than 90%, the consistency is poor, the comprehensive performance of the product is worsened, the cycle performance is unstable, and the low temperature and rate performance are worsened. Therefore, there is a high necessity for a slurry having a viscosity and a fluidity that satisfy the use requirements even in a high-humidity environment.
[ summary of the invention ]
In order to solve the problems, the invention provides the positive electrode active material slurry of the lithium ion battery and the preparation method thereof, and the slurry prepared by the method still has the advantages of high stability and good fluidity under a high-humidity environment.
The invention is realized by the following technical scheme, and provides a preparation method of anode active material slurry of a lithium ion battery, which comprises the following steps:
s1: weighing the active matter, the binder, the conductive agent and the deionized water according to the amount, adding the active matter, the binder, the conductive agent and the deionized water into a double-planet pulping machine together, and stirring for 1.5-3h under the conditions that the revolution speed is 48 revolutions per minute and the autodrive speed is 1700 revolutions per minute to prepare slurry, so that the viscosity of the slurry without mixing reaches 3000-15000 mPa.s;
s2: and (4) dispersing the slurry obtained in the step S1 by using a high-speed dispersion machine under the condition that the rotating speed is 3000-6000 r/min until the viscosity reaches 3000-15000 mPa.s, thus obtaining the active material slurry of the positive electrode of the lithium ion battery.
Specifically, in the step S1, the active material, the binder, and the conductive agent are calculated by weight percentage, and the specific contents are as follows:
93-97.5% of active matter;
1.5 to 3 percent of binder;
1-4% of a conductive agent;
the active matter is lithium nickel manganese oxide, the binder is a composition of any two of CMC, SBR, PAA, sodium alginate and chitosan and PAA, and the conductive agent is a composition of any two of conductive carbon black, crystalline flake graphite and graphene; in the invention, the binder is made of hydrophilic materials, wherein the hydrophilic materials have a suspension effect, SBR and chitosan account for 0-1% to have a bonding effect, the rest part is PAA to have a reinforced bonding effect, CMC has a bonding effect between powder materials and suspension SBR has a bonding effect between powder materials and a fluid collection body, PAA has a bonding effect between powder materials and the fluid collection body, sodium alginate has a bonding effect and a suspension effect between powder materials, and chitosan has a bonding effect between the powder materials and the fluid collection body; the conductive carbon black plays a role in the electric conduction between active matters and with a current collector; the crystalline flake graphite plays a role in improving the particle compaction of the active matters while playing a role in conducting electricity between the active matters and the current collector; the graphene has the same conductive capacity between active matters and as a current collector under the condition that the addition amount of the graphene is 80% less than that of conductive carbon black, the compaction density of active matter particles can be improved, the energy density of a battery is improved, the low specific energy of the battery is combined, the liquid injection time is short in the manufacturing process of the battery, and the yield is effectively improved by over 50%.
Specifically, the mixture of the active material, the binder, the conductive agent and the deionized water in the step S1 is (7-7.8): (2.2-3) mixing is performed so that the slurry can achieve the viscosity required for coating.
The lithium ion battery anode active material slurry prepared by the preparation method of the lithium ion battery anode active material slurry is used for finally preparing a battery with excellent performance.
In the invention, deionized water is adopted to replace NMP (which is low in toxicity and inflammable) adopted in the prior art as a solvent to prepare slurry, the process is environment-friendly and safe, and a novel conductive agent is added for composite use, so that the energy density of the battery is improved, the combined cost is low, the specific energy is high, and the liquid injection time in the battery manufacturing process is short, and the yield is effectively improved by more than 50%.
Finally, coating the prepared slurry on an aluminum foil with the thickness of 12-16 mu m according to the surface density of 200-230 g/square meter, and drying to prepare a positive plate; can also be 3.4-3.6 g/mm according to the active matter3The compacted density is rolled to prepare the compacted positive plate.
The invention provides a lithium ion battery anode active substance slurry, which is prepared from an active substance (nickel lithium manganate), a binder (CMC \ SBR \ PAA \ sodium alginate \ chitosan), a conductive agent (conductive carbon black, flake graphite, graphene) and a solvent (deionized water), wherein an oil-based PVDF binder is replaced by a water-based binder (CMC \ SBR \ PAA \ sodium alginate \ chitosan and the like), so that the material cost is reduced, the preparation is more environment-friendly and safe, the conductive agent (conductive carbon black, flake graphite, graphene and the like) conforms to the use of various materials, the conductive compaction and the energy density of a pole piece can be better improved, a battery with high energy, low cost and safety can be prepared by using the active substance (nickel lithium manganate), and the solvent deionized water is environment-friendly and has low cost. In conclusion, the slurry prepared by the materials has good stability, no combustible components, no toxic and harmful substances, low cost and good processability of the prepared battery cell, can effectively improve the liquid injection speed by more than 50 percent and shorten the production period by more than 3 days; the lithium ion battery produced by the positive plate prepared by the slurry is not easy to cause short circuit of the battery, and has the advantages of long service life, good low-temperature charge and discharge performance, high energy density, safe use, stable cycle performance and the like, and the cost performance of the conventional battery is lower by more than 10%.
[ description of the drawings ]
Fig. 1 is a schematic diagram of capacity retention rate of a lithium ion battery finally prepared by using the lithium ion battery anode active material slurry of the invention at cycle performance of 800 times.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by the following embodiments.
Example 1:
a lithium ion battery positive active material slurry comprising the components:
s1: weighing the components according to the mass percent, weighing a certain amount of deionized water to obtain a mixed solution, wherein the solid content of the mixed solution is 73-78%, adding the mixed solution into a double-planet pulping machine, and stirring for 2 hours under the conditions that the revolution speed is 48 revolutions per minute and the autokinetic transfer speed is 1700 revolutions per minute to prepare slurry;
s2: dispersing the slurry obtained in the step S1 by adopting a high-speed dispersion machine under the condition that the rotating speed is 3500 rpm/min until the viscosity reaches 5000mPa.s, thus obtaining the active material slurry of the positive electrode of the lithium ion battery
Example 2:
a lithium ion battery positive active material slurry comprising the components:
s1: weighing the components according to the mass percentage, weighing a certain amount of deionized water to obtain a mixed solution, wherein the solid content of the mixed solution is 70-76%, adding the mixed solution into a double-planet pulping machine, and stirring for 2.5 hours under the conditions that the revolution speed is 48 revolutions per minute and the autokinetic transfer speed is 1500 revolutions per minute to prepare slurry;
s2: and (4) dispersing the slurry obtained in the step S1 by using a high-speed dispersion machine under the condition that the rotating speed is 4000 revolutions per minute until the viscosity reaches 10000mPa.s, thus obtaining the lithium ion battery anode active material slurry.
Example 3:
a lithium ion battery positive active material slurry comprising the components:
s1: weighing the components according to the mass percent, then weighing a certain amount of deionized water to obtain a mixed solution, wherein the solid content of the mixed solution is 70-76%, adding the mixed solution into a double-planet pulping machine, and stirring for 2.5 hours under the conditions that the revolution speed is 48 revolutions per minute and the autokinetic transfer speed is 1800 revolutions per minute to prepare slurry;
s2: and (4) dispersing the slurry obtained in the step S1 by using a high-speed dispersion machine at the rotating speed of 6000 r/min until the viscosity reaches 10000mPa.s, thus obtaining the lithium ion battery anode active material slurry.
The positive electrode slurry provided by the embodiments 1 to 3 has good surface density consistency of the manufactured positive electrode plate, has high liquid injection speed, and can complete liquid injection only in 6 minutes, while the prior art can meet the requirement only in 13 minutes of liquid injection, so that the slurry provided by the invention has good fluidity in a high-humidity environment, thereby greatly shortening the liquid injection time, and being capable of manufacturing a lithium battery with better quality, meanwhile, the slurry provided by the invention has short activation and aging time of only 36 hours, and the prior art needs 48 hours, and further, the processing time can be saved while the quality of the lithium battery is improved, therefore, the slurry provided by the invention can greatly shorten the production period and improve the processing efficiency while improving the liquid injection speed.
In order to prove that the performance of the lithium battery manufactured by the slurry provided by the invention is improved compared with the lithium battery manufactured by the prior art, the lithium batteries produced by the above embodiment and the prior art are detected by the following steps of detecting the security inspection passing rate, the cycle performance and the discharge platform, and the obtained detection results are shown in table 1 and fig. 1.
TABLE 1
As can be seen from table 1 in conjunction with fig. 1, the lithium batteries prepared by the embodiments of the present invention are superior to the prior art compared to the prior art comparative examples; the battery core manufactured by the embodiment of the invention passes 100% of safety test of a power storage battery for an electric automobile according to GBT31485-2015 safety requirement and a test method, the cycle performance is excellent (800 weeks), and the discharge platform is 3.7V, while the cycle performance of the battery core manufactured by the comparative example is greatly reduced compared with the cycle performance of the battery core manufactured by the embodiment of 800 weeks after only 500 weeks of cycle performance, so that the cycle performance of the lithium battery prepared by the slurry provided by the invention is greatly improved, and the lithium battery prepared by the slurry has the advantages of long service life, good low-temperature charge and discharge performance, high energy density, safety in use, stable cycle performance and the like.
Claims (4)
1. The preparation method of the positive active material slurry of the lithium ion battery is characterized by comprising the following steps of:
s1: weighing the active matter, the binder, the conductive agent and the deionized water according to the amount, adding the active matter, the binder, the conductive agent and the deionized water into a double-planet pulping machine together, and stirring for 1.5-3h under the conditions that the revolution speed is 48 revolutions per minute and the autodrive speed is 1700 revolutions per minute to prepare slurry, so that the viscosity of the slurry without mixing reaches 3000-15000 mPa.s;
s2: and (4) dispersing the slurry obtained in the step S1 by using a high-speed dispersion machine under the condition that the rotating speed is 3000-6000 r/min until the viscosity reaches 3000-15000 mPa.s, thus obtaining the active material slurry of the positive electrode of the lithium ion battery.
2. The method for preparing the slurry of the positive electrode active material of the lithium ion battery according to claim 1, wherein the active material, the binder and the conductive agent in the step S1 comprise the following components in percentage by weight:
93-97.5% of active matter; the processing is not good and the specific energy is low
1.5 to 3 percent of binder;
1-4% of a conductive agent;
the active matter is lithium nickel manganese oxide, the binder is a composition of any two of CMC, SBR, PAA, sodium alginate and chitosan and PAA, the CMC and sodium alginate account for 0-1% of the composition and play a role in suspension, the SBR and chitosan account for 0-1% of the composition and play a role in adhesion, the rest of the composition is PAA and plays a role in reinforcing adhesion, and the conductive agent is a composition of any two of conductive carbon black, flake graphite and graphene.
3. The method for preparing the lithium ion battery positive electrode active material slurry according to claim 2, wherein the mixture of the active material, the binder, the conductive agent and the deionized water in the step S1 is prepared according to the following steps of (7-7.8): (2.2-3) mixing.
4. A lithium ion battery positive electrode active material slurry prepared according to the preparation method of the lithium ion battery positive electrode active material slurry of any one of claims 1 to 3.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114068915A (en) * | 2021-11-04 | 2022-02-18 | 惠州锂威新能源科技有限公司 | Preparation method and application of positive electrode slurry |
| CN114614007A (en) * | 2022-02-17 | 2022-06-10 | 东莞凯德新能源有限公司 | Lithium ion battery anode slurry and preparation method thereof |
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| JP2015015156A (en) * | 2013-07-05 | 2015-01-22 | 株式会社Ｇｓユアサ | Method for manufacturing battery |
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