CN112234198A - 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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- CN112234198A CN112234198A CN202010966766.0A CN202010966766A CN112234198A CN 112234198 A CN112234198 A CN 112234198A CN 202010966766 A CN202010966766 A CN 202010966766A CN 112234198 A CN112234198 A CN 112234198A
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 38
- 239000006256 anode slurry Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000002904 solvent Substances 0.000 claims abstract description 102
- 238000002156 mixing Methods 0.000 claims abstract description 79
- 239000006258 conductive agent Substances 0.000 claims abstract description 40
- 239000011230 binding agent Substances 0.000 claims abstract description 36
- 239000003292 glue Substances 0.000 claims abstract description 28
- 239000007787 solid Substances 0.000 claims abstract description 28
- 239000002270 dispersing agent Substances 0.000 claims abstract description 25
- 238000003756 stirring Methods 0.000 claims abstract description 20
- 239000011812 mixed powder Substances 0.000 claims abstract description 18
- 239000013543 active substance Substances 0.000 claims abstract description 11
- 239000011267 electrode slurry Substances 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 21
- 239000007774 positive electrode material Substances 0.000 claims description 18
- 239000006185 dispersion Substances 0.000 claims description 12
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 6
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 6
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 6
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 5
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 5
- 229950008882 polysorbate Drugs 0.000 claims description 5
- 229920000136 polysorbate Polymers 0.000 claims description 5
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 239000002033 PVDF binder Substances 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 4
- 239000002245 particle Substances 0.000 abstract description 13
- 239000002002 slurry Substances 0.000 abstract description 13
- 239000000463 material Substances 0.000 abstract description 8
- 238000010008 shearing Methods 0.000 abstract description 3
- 238000000265 homogenisation Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 238000007580 dry-mixing Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 239000003960 organic solvent Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000013557 residual solvent Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000002706 dry binder Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation 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
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000007614 solvation Methods 0.000 description 1
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Classifications
-
- 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
-
- 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
- H01M4/04—Processes of manufacture in general
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention relates to a lithium ion battery anode slurry and a preparation method thereof, wherein the preparation method of the lithium ion battery anode slurry comprises the following steps: s1, mixing the binder and the first mass part of solvent, and stirring to mix uniformly to form a glue solution; s2, putting the positive active substance, the conductive agent and the dispersing agent into a mixing stirrer, and uniformly mixing to form mixed powder; and S3, mixing the solvent in the second mass part, the glue solution and the mixed powder, and stirring to mix uniformly to obtain the anode slurry with the solid content of 55-58%. According to the invention, the dispersing agent is added into the anode slurry, so that the dispersing agent can fully wet the anode active substance with small particle size and other active substances with less solvent content in a lower shearing environment, the solid content of the slurry is improved, and the use amount of the solvent is reduced, so that the material cost is reduced, the discharge of the solvent is reduced, and the pollution to the environment is reduced.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery anode slurry and a preparation method thereof.
Background
The lithium ion battery has the characteristics of high specific energy, high power density, long cycle life, environmental friendliness and the like, and is widely applied to the fields of consumer electronics, electric automobiles, energy storage and the like. With the continuous expansion of the application field, more attention is paid to the use and treatment of organic solvents and the influence of the organic solvents on the environment in the manufacturing process of lithium ion batteries. Therefore, it is necessary to provide a method for minimizing the use of a solvent (N-methylpyrrolidone) in the preparation of a positive electrode slurry, so as to reduce environmental pollution.
In the conventional method, a dry homogenization process is generally used, and the slurry is kneaded at a higher solid content in order to allow the positive electrode active material to be completely wetted with less solvent, thereby reducing the amount of solvent used and discharging at a higher solid content. However, the homogenization method has high requirements on equipment, requires high-shear homogenization equipment, can run for a long time under the condition of high torque, and has high equipment loss. And the homogenization method has a limited ability to increase the solid content, i.e., a limited proportion of solvent that can be reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a lithium ion battery anode slurry and a preparation method thereof aiming at the defects in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: the preparation method of the positive electrode slurry for the lithium ion battery comprises the following steps:
s1, mixing the binder and the first mass part of solvent, and stirring to mix uniformly to form a glue solution;
s2, putting the positive active substance, the conductive agent and the dispersing agent into a mixing stirrer, and uniformly mixing to form mixed powder;
and S3, mixing the solvent in the second mass part, the glue solution and the mixed powder, and stirring to mix uniformly to obtain the anode slurry with the solid content of 55-58%.
Preferably, the conductive agent includes a first conductive agent and a second conductive agent;
the mass ratio of the binder to the total amount of the solvent to the positive electrode active material to the first conductive agent to the second conductive agent to the dispersant is 1.5-4.5: 72.5-82: 92-97: 0.5-3: 0.5-2: 0.2 to 1;
wherein the total amount of the solvent is the sum of the mass of the first part by mass of the solvent and the mass of the second part by mass of the solvent.
Preferably, in the glue solution, the mass ratio of the binder to the first mass part of the solvent is 8: 92.
Preferably, the positive electrode active material is lithium iron phosphate;
the dispersing agent is one or more of polysorbate, sodium polyacrylate and polyvinylpyrrolidone.
Preferably, the positive electrode active material is lithium iron phosphate;
the dispersing agent is one or more of polysorbate, sodium polyacrylate and polyvinylpyrrolidone.
Preferably, the binder is polyvinylidene fluoride;
the first part by mass of solvent and the second part by mass of solvent are N-methylpyrrolidone;
the first conductive agent is conductive carbon black, and the second conductive agent is conductive graphite.
Preferably, in the step S1, the glue solution is formed by mixing in a dispersion mixer, wherein the revolution speed of the dispersion mixer is 30rpm/min, the rotation speed is 1500rpm/min, and the mixing time is 105-135 min.
Preferably, in the step S2, the revolution speed of the mixer/agitator is 30rpm/min, the rotation speed is 500rpm/min, and the mixing time is 25 to 35 min.
Preferably, in the step S3, the positive electrode slurry is mixed in a mixer, wherein the revolution speed of the mixer is 30rpm/min, the rotation speed of the mixer is 1500rpm/min, and the mixing time is 105 to 135 min.
The invention also provides the lithium ion battery anode slurry which is prepared by the preparation method of the lithium ion battery anode slurry.
The lithium ion battery anode slurry and the preparation method thereof have the following beneficial effects:
by adding the dispersing agent into the anode slurry, the dispersing agent can fully wet the anode active substance with small particle size and other active substances with less solvent content in a lower shearing environment, so that the solid content of the slurry is improved, the use amount of the solvent is reduced, the material cost is reduced, the discharge of the solvent is reduced, and the pollution to the environment is reduced.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic flow chart of a first example of a method for producing a positive electrode slurry for a lithium ion battery according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic flow chart of a first embodiment of a method for preparing a positive electrode slurry for a lithium ion battery according to the present invention, which comprises the steps of:
and S1, mixing the binder and the first mass part of solvent, and stirring to mix uniformly to form a glue solution.
Where the binder is polyvinylidene fluoride (PVDF) and the solvent is N-methylpyrrolidone (NMP), it is understood that the solvent used in this step is the same as the solvent used in step S3, except that the parts by mass may be different, and therefore, different parts by mass may be used for differentiation.
Taking 72.5-82 parts by mass of solvent as the total amount of the solvent for use in step S1 and step S3, taking a part of the solvent from the total amount of the solvent as a first part by mass, and taking 1.5-4.5 parts by mass of a binder to put into a dispersion mixer for mixing, wherein the revolution speed of the dispersion mixer is 30rpm/min, the rotation speed is 1500rpm/min, and the mixing time is 105-135 min, so as to form a glue solution for later use.
The binder can be selected from a range of 1.5-4.5 parts by mass, and after the specific parts by mass of the binder are determined, the parts by mass of the solvent are determined according to the mass ratio of the binder to the solvent of 8:92, and the determined parts by mass of the solvent serve as the first parts by mass of the solvent. Thus, in this step, a glue solution with a binder solid content of 8% was prepared.
And S2, adding the positive electrode active substance, the conductive agent and the dispersing agent into a mixer, and uniformly mixing to form mixed powder.
Wherein, the positive active material is lithium iron phosphate (LFP), the conductive agent is conductive carbon black (SP) and conductive graphite (KS-6), in the step, the conductive carbon black is taken as a first conductive agent, the conductive graphite is taken as a second conductive agent, and the first conductive agent and the second conductive agent are added into a mixing stirrer at the same time. The dispersant is one or more of polysorbate, sodium polyacrylate and polyvinylpyrrolidone (PVP).
The method comprises a positive electrode dry mixing step, and specifically comprises the steps of putting 92-97 parts by mass of a positive electrode active substance, 0.5-3 parts by mass of a first conductive agent, 0.5-2 parts by mass of a second conductive agent and 0.2-1 part by mass of a dispersing agent into a mixing stirrer for dry mixing, wherein the revolution speed of the mixing stirrer is 30rpm/min, the rotation speed of the mixing stirrer is 500rpm/min, the stirring and mixing time is 25-35 min, and the uniform mixed powder is obtained by uniformly mixing.
Wherein, the mixing stirrer can adopt a double-planet mixing stirrer. It is understood that step S1 and step S2 may be performed simultaneously.
And S3, mixing the solvent, the glue solution and the mixed powder in the second mass part, and stirring to mix uniformly to obtain the anode slurry with the solid content of 55-58%.
In this step, the solvent used is N-methylpyrrolidone, which is the same as the solvent in step S1, and the solvent is divided into a second part by mass obtained by subtracting the first part by mass from the total amount of the solvent.
Specifically, the solvent remaining in the step S1 is taken as the second mass part of the solvent, the glue solution in the step S1 is added into a mixing stirrer, and the mixture is mixed and stirred with the mixed powder obtained in the step S2, wherein the revolution speed of the mixing stirrer is 30rpm/min, the rotation speed is 1500rpm/min, and the stirring and mixing time is 105-135 min, so that the positive electrode slurry with the solid content of 55-58% is obtained.
It can be understood that, the step S1 and the step S2 are performed simultaneously, and in the step S3, the solvent remaining in the total amount of the solvent and the glue solution obtained in the step S1 are put into the mixing stirrer in which the mixed powder obtained in the step S2 is located to be mixed with the mixed powder, so that the steps of transferring are effectively reduced.
The viscosity of the positive electrode slurry obtained in the step S3 is 8500-10500 mpa.s, the viscosity is proper, the number of particles is small, and the homogenization is completed.
In the preparation method, the total amount of the binder, the solvent, the positive active material, the first conductive agent, the second conductive agent, the dispersing agent and the like are weighed according to the proportion of the raw materials of the positive slurry of the lithium ion battery, and the mass ratio of the binder to the solvent is 1.5-4.5: 72.5-82: 92-97: 0.5-3: 0.5-2: 0.2 to 1. It is understood that the respective raw materials may take any values within their mass ratio ranges.
Based on the first example, the raw materials are specifically selected, and the second example and the third example are made to further explain the preparation method of the lithium ion battery positive electrode slurry of the present invention.
In a second embodiment of the method for preparing a lithium ion battery anode slurry according to the present invention, the method for preparing a lithium ion battery anode slurry includes the following steps:
and S11, putting 3 parts by mass of dry binder powder and 34.5 parts by mass of solvent into a dispersion mixer for mixing, wherein the revolution speed of the dispersion mixer is 30rpm/min, the rotation speed is 1500rpm/min, and the mixing time is 105-135 min, so as to prepare a glue solution with the binder solid content of 8% for later use.
It is understood that the mass ratio of the binder to the solvent charged is 8:92, so that a glue solution is obtained with a binder solid content of 8%. Wherein the total amount of the solvents is 82 parts by mass of the solvents, when the binder is 3 parts by mass, the first part by mass of the solvents is 34.5 parts by mass, and the remaining solvents are used as the second part by mass of the solvents in step S13.
S12, putting 94 parts by mass of the positive electrode active material, 1.5 parts by mass of the first conductive agent, 1 part by mass of the second conductive agent and 0.5 part by mass of the dispersing agent into a mixing stirrer for dry mixing, wherein the revolution speed of the mixing stirrer is 30rpm/min, the rotation speed is 500rpm/min, the stirring and mixing time is 25-35 min, and uniformly mixing to obtain uniform mixed powder.
S13, adding the residual solvent in 82 parts by mass of solvent as a second part by mass of solvent, namely 47.5 parts by mass of solvent and the glue solution in the step S1 into a mixing stirrer, mixing and stirring the mixture with the mixed powder obtained in the step S2, wherein the revolution speed of the mixing stirrer is 30rpm/min, the rotation speed is 1500rpm/min, and the stirring and mixing time is 105-135 min, so that the anode slurry with the solid content of 55% is obtained, the slurry viscosity is 10500mpa.s, the viscosity is proper, the particles are few, and the homogenization is completed. Preferably, the second mass part of the solvent and the glue solution is added into the mixing stirrer used in the step S12 for mixing, so as to reduce the transfer step.
It is understood that this embodiment is different from the first embodiment described above in that the total amount of the binder, the solvent, the positive electrode active material, the first conductive agent, the second conductive agent, and the dispersant are specifically set to 3, 82, 94, 1.5, 1, and 0.5 parts by mass, respectively, a positive electrode slurry having a solid content of 55% is prepared, the slurry viscosity is 10500mpa.s, and the solvent accounts for 45% of the positive electrode slurry.
In a third embodiment of the method for preparing a lithium ion battery anode slurry according to the present invention, the method for preparing a lithium ion battery anode slurry includes the following steps:
s21, putting 2.5 parts by mass of binder dry powder and 28.75 parts by mass of solvent into a dispersion mixer for mixing, wherein the revolution speed of the dispersion mixer is 30rpm/min, the rotation speed is 1500rpm/min, and the mixing time is 105-135 min, so as to prepare a glue solution with the binder solid content of 8% for later use.
It is understood that the mass ratio of the binder to the solvent charged is 8:92, so that a glue solution is obtained with a binder solid content of 8%. Wherein the total amount of the solvents is 72.5 parts by mass of the solvents, when the binder takes 2.5 parts by mass, the first part by mass of the solvents takes 28.75 parts by mass, and the remaining solvents are used as the second part by mass of the solvents in step S23.
S22, putting 94 parts by mass of the positive electrode active material, 1.5 parts by mass of the first conductive agent, 1 part by mass of the second conductive agent and 1 part by mass of the dispersing agent into a mixing stirrer for dry mixing, wherein the revolution speed of the mixing stirrer is 30rpm/min, the rotation speed is 500rpm/min, the stirring and mixing time is 25-35 min, and uniformly mixing to obtain uniform mixed powder.
S23, adding the solvent in the second part by mass of 72.5 parts by mass of the solvent, namely 43.75 parts by mass of the solvent and the glue solution in the step S1 into a mixing stirrer, mixing the mixture with the mixed powder obtained in the step S2, stirring, wherein the revolution speed of the mixing stirrer is 30rpm/min, the rotation speed is 1500rpm/min, and the stirring and mixing time is 105-135 min, so that the anode slurry with the solid content of 58% is obtained, the slurry viscosity is 8500mpa.s, the viscosity is proper, the particles are few, and the homogenization is completed. Preferably, the second mass part of the solvent and the glue solution is added into the mixing stirrer used in the step S22 for mixing, so as to reduce the transfer step.
It is understood that this embodiment is different from the first embodiment described above in that the total amount of the binder, the solvent, the positive electrode active material, the first conductive agent, the second conductive agent, and the dispersant are specifically set to 2.5, 72.5, 94, 1.5, 1, by mass, respectively, and the positive electrode slurry having a solid content of 58% is prepared, and the slurry viscosity is 8500mpa.s, and the solvent accounts for 42% of the positive electrode slurry.
The following comparative example, in which formulation raw materials include a binder, a solvent, a positive active material, and a conductive agent, is used to illustrate a conventional method of preparing a positive electrode slurry for a lithium ion battery. In the comparative example, the method for preparing the positive electrode slurry for a lithium ion battery includes the steps of:
(1) and (3) gluing a binder: taking 3 parts by mass of dry binder powder and 34.5 parts by mass of solvent, putting into a dispersion mixer, and mixing, wherein the revolution speed of the dispersion mixer is 30rpm/min, the rotation speed is 1500rpm/min, and the mixing time is 105-135 min, so as to prepare a glue solution with the binder solid content of 8% for later use.
It is understood that the mass ratio of the binder to the solvent charged is 8:92, so that a glue solution is obtained with a binder solid content of 8%. Wherein the total amount of the solvent is 100 parts by mass of the solvent, when the binder is taken as 3 parts by mass, the first part by mass of the solvent is 34.5 parts by mass, and the remaining solvent is used in the following step.
(2) And (3) a positive electrode dry mixing step: and (2) putting 94 parts by mass of the positive electrode active material, 2 parts by mass of the first conductive agent and 1 part by mass of the second conductive agent into a mixing stirrer for dry mixing, wherein the revolution speed of the mixing stirrer is 30rpm/min, the rotation speed of the mixing stirrer is 500rpm/min, the stirring and mixing time is 25-35 min, and uniformly mixing to obtain uniform mixed powder.
Wherein, the mixing stirrer can adopt a double-planet mixing stirrer. It is understood that step (1) and step (2) may be performed simultaneously.
(3) And (3) homogenizing the positive electrode: and (2) adding 47.5 parts by mass of the solvent in the residual solvent in 100 parts by mass of the solvent and the glue solution in the step (1) into a mixing stirrer, and mixing and stirring the mixture and the mixed powder obtained in the step S2, wherein the revolution speed of the mixing stirrer is 45rpm/min, the rotation speed is 2500rpm/min, and the stirring and mixing time is 165-195 min, so that the anode slurry with the solid content of 55% is obtained, and at the moment, the tested anode slurry has the viscosity of more than 30000mpa.s, is too high in viscosity, cannot be coated, poor in dispersing effect, large in particles and needs to be continuously dispersed and adjusted in viscosity.
Preferably, 47.5 parts by mass of the solvent and the glue solution are added into the mixing stirrer used in the step (2) for mixing, so as to reduce the transfer step.
(4) And (3) adjusting the viscosity: and adding the finally residual solvent in 100 parts by mass of the solvent, namely 18 parts by mass of the solvent into a mixing stirrer to adjust the viscosity of the anode slurry, wherein the revolution speed of the mixing stirrer is 45rpm/min, the rotation speed is 2500rpm/min, the stirring and mixing time is 50-70 min, and the anode slurry with the solid content of 50% is obtained, at the moment, the viscosity of the slurry is 12000mpa.s, the viscosity is suitable for coating, and the anode slurry can be discharged after homogenization.
It is understood that the specific material selection of the binder, the solvent, the positive electrode active material, the first conductive agent, and the second conductive agent in this embodiment is the same as that in the first embodiment, and the positive electrode slurry obtained in this embodiment does not have a dispersant.
From the above, it can be seen that the results of comparing the second and third examples of the present invention (hereinafter referred to as examples of the present invention) with the comparative examples are: under the condition that the total mass of other materials except the solvent in the positive electrode slurry is the same, the using amount of the solvent in the comparative example is 100 parts by mass, while the using amount of the solvent in the embodiment of the invention is 72.5-82 parts by mass, the using amount of the solvent is reduced by 18-27.5%, and the material cost is reduced; the solvent of the comparative example accounts for 50% of the anode slurry, and the solvent of the embodiment of the invention accounts for 42-45% of the anode slurry, so that the emission of organic solvent is reduced, and the pollution to the environment is reduced; the solid content of the slurry in the comparative example is 50%, while the solid content of the slurry in the embodiment is 55-58%, so that the solid content of discharged materials of the anode slurry is improved; the time for the comparison example is 5-7 hours, while the time for the embodiment of the invention is 3.5-4.5 hours, obviously, the pulping time of the embodiment of the invention is greatly shortened, and the production efficiency is improved.
Understandably, by selecting a specific positive electrode active material and a specific dispersing agent, the surface energy of a small-particle-size positive electrode material can be remarkably reduced, bubbles on the surfaces of particles are discharged, gaps are reduced, the agglomeration of positive electrode particles is avoided, the steric hindrance of the solvation volume of the particles is compressed, the particle size of the particles is reduced, the particles can be completely coated by less solvent, the preparation of slurry can be completed by higher solid content, and the purpose of reducing the using amount of the solvent is achieved.
According to the invention, the dispersing agent is added into the anode slurry, so that the dispersing agent can fully wet the anode active substance with small particle size and other active substances with less solvent content in a lower shearing environment, the solid content of the slurry is improved, and the use amount of the solvent is reduced, so that the material cost is reduced, the emission of the organic solvent is reduced, and the environmental pollution is reduced.
The lithium ion battery positive electrode slurry is prepared by the methods of the first embodiment, the second embodiment and the third embodiment of the preparation method of the lithium ion battery positive electrode slurry.
The lithium ion battery comprises a positive plate, and the positive plate is made of the positive electrode slurry. And coating the positive electrode slurry on a base material when the positive electrode plate is manufactured, and drying to obtain the positive electrode plate. And further, overlapping the positive plate, the negative plate and the diaphragm, winding the superposed positive plate, the negative plate and the diaphragm into a winding core, putting the winding core into an aluminum shell, injecting electrolyte, and sealing the opening to obtain the lithium ion battery.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. The preparation method of the lithium ion battery anode slurry is characterized by comprising the following steps:
s1, mixing the binder and the first mass part of solvent, and stirring to mix uniformly to form a glue solution;
s2, putting the positive active substance, the conductive agent and the dispersing agent into a mixing stirrer, and uniformly mixing to form mixed powder;
and S3, mixing the solvent in the second mass part, the glue solution and the mixed powder, and stirring to mix uniformly to obtain the anode slurry with the solid content of 55-58%.
2. The method for preparing the positive electrode slurry for the lithium ion battery according to claim 1, wherein:
the conductive agent comprises a first conductive agent and a second conductive agent;
the mass ratio of the binder to the total amount of the solvent to the positive electrode active material to the first conductive agent to the second conductive agent to the dispersant is 1.5-4.5: 72.5-82: 92-97: 0.5-3: 0.5-2: 0.2 to 1;
wherein the total amount of the solvent is the sum of the mass of the first part by mass of the solvent and the mass of the second part by mass of the solvent.
3. The method for preparing the positive electrode slurry for the lithium ion battery according to claim 2, wherein:
in the glue solution, the mass ratio of the binder to the first mass part of the solvent is 8: 92.
4. The method for preparing the positive electrode slurry for the lithium ion battery according to claim 1, wherein:
the positive active material is lithium iron phosphate;
the dispersing agent is one or more of polysorbate, sodium polyacrylate and polyvinylpyrrolidone.
5. The method for preparing the positive electrode slurry for the lithium ion battery according to claim 2, wherein:
the positive active material is lithium iron phosphate;
the dispersing agent is one or more of polysorbate, sodium polyacrylate and polyvinylpyrrolidone.
6. The method for preparing the positive electrode slurry for the lithium ion battery according to claim 5, wherein:
the binder is polyvinylidene fluoride;
the first part by mass of solvent and the second part by mass of solvent are N-methylpyrrolidone;
the first conductive agent is conductive carbon black, and the second conductive agent is conductive graphite.
7. The method for preparing the positive electrode slurry for the lithium ion battery according to claim 1, wherein:
in the step S1, the glue solution is formed by mixing in a dispersion mixer, wherein the revolution speed of the dispersion mixer is 30rpm/min, the rotation speed is 1500rpm/min, and the mixing time is 105-135 min.
8. The method for preparing the positive electrode slurry for the lithium ion battery according to claim 1, wherein:
in the step S2, the revolution speed of the mixer-agitator is 30rpm/min, the rotation speed is 500rpm/min, and the mixing time is 25-35 min.
9. The method for preparing the positive electrode slurry for the lithium ion battery according to claim 1, wherein:
in the step S3, the positive electrode slurry is mixed in a mixer, wherein the revolution speed of the mixer is 30rpm/min, the rotation speed is 1500rpm/min, and the mixing time is 105-135 min.
10. A lithium ion battery positive electrode slurry, characterized by being prepared by the method for preparing a lithium ion battery positive electrode slurry according to any one of claims 1 to 9.
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