CN113793917A - Dry preparation method of lithium battery electrode - Google Patents
Dry preparation method of lithium battery electrode Download PDFInfo
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- CN113793917A CN113793917A CN202111090020.9A CN202111090020A CN113793917A CN 113793917 A CN113793917 A CN 113793917A CN 202111090020 A CN202111090020 A CN 202111090020A CN 113793917 A CN113793917 A CN 113793917A
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- lithium battery
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 33
- 239000002904 solvent Substances 0.000 claims abstract description 43
- 238000003756 stirring Methods 0.000 claims abstract description 40
- 239000000843 powder Substances 0.000 claims abstract description 39
- 239000002245 particle Substances 0.000 claims abstract description 33
- 239000006258 conductive agent Substances 0.000 claims abstract description 30
- 238000002156 mixing Methods 0.000 claims abstract description 20
- 239000013543 active substance Substances 0.000 claims abstract description 19
- 239000011230 binding agent Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000000576 coating method Methods 0.000 claims abstract description 10
- 238000009736 wetting Methods 0.000 claims abstract description 8
- 238000010008 shearing Methods 0.000 claims abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 230000005484 gravity Effects 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 9
- 239000006185 dispersion Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 229910021389 graphene Inorganic materials 0.000 claims description 6
- 239000007773 negative electrode material Substances 0.000 claims description 6
- 239000007774 positive electrode material Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 238000005098 hot rolling Methods 0.000 claims description 5
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 3
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 3
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- 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 claims description 3
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical compound [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 claims description 3
- 230000001133 acceleration Effects 0.000 claims description 3
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 3
- 239000011149 active material Substances 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 229910021383 artificial graphite Inorganic materials 0.000 claims description 3
- 239000006229 carbon black Substances 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 3
- 239000002041 carbon nanotube Substances 0.000 claims description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 3
- 238000012512 characterization method Methods 0.000 claims description 3
- 239000010941 cobalt Substances 0.000 claims description 3
- 229910017052 cobalt Inorganic materials 0.000 claims description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 3
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 claims description 3
- 229920001971 elastomer Polymers 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 3
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 3
- 239000002931 mesocarbon microbead Substances 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 229910021382 natural graphite Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims description 3
- 239000005060 rubber Substances 0.000 claims description 3
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 3
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 3
- 229910021384 soft carbon Inorganic materials 0.000 claims description 3
- 239000008096 xylene Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000007731 hot pressing Methods 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000006256 anode slurry Substances 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006257 cathode slurry Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011267 electrode slurry Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229920005596 polymer binder Polymers 0.000 description 1
- 239000002491 polymer binding agent Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0409—Methods of deposition of the material by a doctor blade method, slip-casting or roller coating
-
- 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
-
- 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
-
- 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 the technical field of lithium batteries, and discloses a dry preparation method of a lithium battery electrode, which comprises the following steps: the method comprises the steps of quantitatively adding 75-90% of active substances, 0-5% of conductive agents and 5-10% of binder powder into a stirring kettle, uniformly mixing dry powder, adding a proper amount of solvent, wetting powder particles, enabling the surfaces of the powder particles to adsorb the solvent, simultaneously carrying out high-strength stirring, fully and uniformly mixing the wetted powder particles, continuously adding the solvent, dispersing a particle group under the action of high-speed shearing force generated by high-strength stirring, uniformly distributing the conductive agents, continuously adding the solvent, and adjusting viscosity to enable the particle group to be suitable for a coating process. The dry preparation method has the advantages of good dispersibility, low viscosity and high-efficiency full crushing and separating capability, and the uniform mixing of the raw materials can effectively improve the electrode performance of the lithium battery, enhance the stability of the lithium battery electrode and prolong the service life of the lithium battery electrode in the preparation process.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a dry preparation method of a lithium battery electrode.
Background
The lithium ion battery is a complex system engineering, the performance of the battery is influenced by a plurality of factors such as raw materials, battery design, manufacturing equipment and process, environment and the like, any defect can cause the collapse of a battery product, the material is the basis of the lithium battery, the manufacturing process is also important, wherein the influence degree of a mixing process on the quality of the product in the whole production process of the lithium ion battery is more than 30 percent, the mixing process is the most important link in the whole production process, in the electrode manufacturing of the lithium ion battery, anode and cathode slurry basically comprises active substances, polymer binders, conductive agents and the like, and the mixing process of the electrode slurry is roughly divided into three types: ball milling process, wet mixing process and dry mixing process, wherein the dry process is widely used as the mature preparation method at present,
the basic process of the dry process flow is that active substances, a conductive agent and adhesive dry powder are mixed, a proper amount of solvent is added for wetting, the solvent is added for dispersing and crushing, the viscosity is adjusted by dilution, and the requirements on battery slurry are met. Accordingly, one skilled in the art provides a dry process for preparing an electrode of a lithium battery to solve the problems set forth in the background art.
Disclosure of Invention
The invention aims to provide a dry preparation method of a lithium battery electrode, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the dry preparation method of the lithium battery electrode is characterized in that a preparation material of the lithium battery electrode consists of 75-90% of active substances, 0-5% of conductive agents, 5-10% of adhesives and 5-10% of solvents by mass;
the preparation method comprises the following steps:
quantitatively adding 75-90% of active substance, 0-5% of conductive agent and 5-10% of binder powder into a stirring kettle, and uniformly mixing dry powder;
adding a proper amount of solvent, wetting the powder particles to enable the surfaces of the powder particles to adsorb the solvent, and simultaneously carrying out high-intensity stirring to fully and uniformly mix the wet powder particles;
continuously adding the solvent, and dispersing the particle group under the action of high-speed shearing force generated by high-strength stirring to uniformly distribute the conductive agent;
the solvent is continuously added to adjust the viscosity to be suitable for the coating process.
As a still further scheme of the invention: the stirring kettle is in the form of a single planet stirrer;
mixing and stirring the active substance, the conductive agent and the binder dry powder for 1-2 h at the rotating speed of 30-300r/min and controlling the stirring temperature at room temperature;
after the solvent is added, the high-intensity stirring and mixing time is 0.5-2 h, the rotating speed is 500-3000r/min, and the stirring temperature is controlled at 20-50 ℃;
dispersion strength due to high shear forces can be measured by the Froude number FrCharacterization by the formula
Wherein ω isrFor stirring the impeller speed, rtG is the acceleration of gravity, defined as the ratio of the centrifugal force acting on the particles to the gravitational force, and F, when the impeller radius is kept constantrDepending on the omega of the impeller, the higher the speed of rotation of the impeller, the higher the Froude number FrThe larger, i.e., the greater the high-speed dispersion strength.
As a still further scheme of the invention: the active material includes a positive electrode active material and a negative electrode active material:
the positive active material comprises one or more of lithium iron silicate, ternary material, lithium manganate, lithium cobaltate, high nickel low cobalt and lithium nickel cobalt manganate;
the negative active material comprises one or more of natural graphite, artificial graphite, mesocarbon microbeads, graphene, lithium carbonate and soft carbon.
As a still further scheme of the invention: the conductive agent comprises one or more of carbon black, conductive graphite, carbon fiber, carbon nano tube and graphene.
As a still further scheme of the invention: the binder comprises one or more of polyvinyl alcohol, sodium carboxymethyl cellulose, fluorinated rubber, polyurethane and polytetrafluoroethylene.
As a still further scheme of the invention: the solvent comprises one or more of ethylene carbonate, propylene carbonate, diethyl carbonate, ethylene glycol dimethyl ether, toluene and xylene.
As a still further scheme of the invention: the coating process adopts a hot-pressing roller form for hot rolling, and the hot rolling temperature of the hot-pressing roller is 120-240 ℃.
As a still further scheme of the invention: the positive and negative electrodes of the lithium battery are prepared by the method as claimed in claims 1 to 7.
Compared with the prior art, the invention has the beneficial effects that:
the dry preparation method disclosed by the invention is good in dispersibility, low in viscosity and high in efficient and sufficient crushing and separating capacity, can be used for effectively and fully stirring and mixing the raw materials in the lithium battery electrode, improving the dispersion uniformity among the raw materials and avoiding the occurrence of raw material agglomeration, and in the preparation process, the raw materials are uniformly mixed, so that the electrode performance of the lithium battery can be effectively improved, the stability of the lithium battery electrode is enhanced, and the service life of the lithium battery electrode is prolonged.
Detailed Description
Example one
In the embodiment of the invention, the dry preparation method of the lithium battery electrode is characterized in that a preparation material of the lithium battery electrode consists of 75% of active substances, 5% of conductive agents, 10% of binders and 10% of solvents by mass respectively;
the preparation method comprises the following steps:
quantitatively adding 75% of active substance, 5% of conductive agent and 10% of binder powder into a stirring kettle, and uniformly mixing dry powder;
adding a solvent with the specific gravity of 5 percent, wetting the powder particles to enable the surfaces of the powder particles to adsorb the solvent, and simultaneously carrying out high-intensity stirring to fully and uniformly mix the wetted powder particles;
continuously adding 3 percent of solvent, and dispersing the particle group under the action of high-speed shearing force generated by high-strength stirring to uniformly distribute the conductive agent;
the solvent with 2 percent of specific gravity is added continuously, and the viscosity is adjusted to be suitable for the coating process.
Further, the stirring kettle is in the form of a single planet stirrer;
mixing and stirring the active substance, the conductive agent and the binder dry powder for 1-2 h at the rotating speed of 30-300r/min and controlling the stirring temperature at room temperature;
after the solvent is added, the high-intensity stirring and mixing time is 0.5-2 h, the rotating speed is 500-3000r/min, and the stirring temperature is controlled at 20-50 ℃;
dispersion strength due to high shear forces can be measured by the Froude number FrCharacterization by the formula
Wherein ω isrFor stirring the impeller speed, rtG is the acceleration of gravity, defined as the ratio of the centrifugal force acting on the particles to the gravitational force, and F, when the impeller radius is kept constantrDepending on the omega of the impeller, the higher the speed of rotation of the impeller, the higher the Froude number FrThe larger, i.e., the greater the high-speed dispersion strength.
Further, the active material includes a positive electrode active material and a negative electrode active material:
the positive active material comprises one or more of lithium iron silicate, ternary material, lithium manganate, lithium cobaltate, high nickel low cobalt and nickel cobalt lithium manganate;
the negative active material comprises one or more of natural graphite, artificial graphite, mesocarbon microbeads, graphene, lithium carbonate and soft carbon.
Further, the conductive agent comprises one or more of carbon black, conductive graphite, carbon fiber, carbon nanotube and graphene.
Further, the binder comprises one or more of polyvinyl alcohol, sodium carboxymethylcellulose, fluorinated rubber, polyurethane and polytetrafluoroethylene.
Further, the solvent comprises one or more of ethylene carbonate, propylene carbonate, diethyl carbonate, ethylene glycol dimethyl ether, toluene and xylene.
Further, the coating process adopts a hot-pressing roller form for hot rolling, and the hot rolling temperature of the hot-pressing roller is 120-240 ℃.
Further, a positive electrode and a negative electrode of a lithium battery are prepared by the method according to claims 1 to 7.
Example two
The preparation is carried out completely according to the scheme of the first embodiment, and different from the first embodiment: the dry preparation method of the lithium battery electrode is characterized in that a preparation material of the lithium battery electrode consists of 80% by mass, 4% by mass, 8% by mass and 8% by mass of a mixture of an active substance, a conductive agent, a binder and a solvent;
the preparation method comprises the following steps:
quantitatively adding 80% of active substance, 4% of conductive agent and 8% of binder powder into a stirring kettle, and uniformly mixing dry powder;
adding a solvent with the specific gravity of 4 percent, wetting the powder particles to enable the surfaces of the powder particles to adsorb the solvent, and simultaneously carrying out high-intensity stirring to fully and uniformly mix the wetted powder particles;
continuously adding a solvent with the proportion of 2 percent, and dispersing the particle group under the action of high-speed shearing force generated by high-strength stirring to uniformly distribute the conductive agent;
the solvent with 2 percent of specific gravity is added continuously, and the viscosity is adjusted to be suitable for the coating process.
EXAMPLE III
The preparation is carried out completely according to the scheme of the first example, and different from the first example and the second example, the preparation method comprises the following steps: the dry preparation method of the lithium battery electrode is characterized in that a preparation material of the lithium battery electrode consists of active substances, a conductive agent, a binder and a solvent, wherein the mass ratios of mixtures of the active substances, the conductive agent, the binder and the solvent are respectively 86%, 2%, 6% and 6%;
the preparation method comprises the following steps:
quantitatively adding 86% of active substance, 2% of conductive agent and 6% of binder powder into a stirring kettle, and uniformly mixing dry powder;
adding a solvent with the specific gravity of 2 percent, wetting the powder particles to enable the surfaces of the powder particles to adsorb the solvent, and simultaneously carrying out high-intensity stirring to fully and uniformly mix the wetted powder particles;
continuously adding a solvent with the proportion of 2 percent, and dispersing the particle group under the action of high-speed shearing force generated by high-strength stirring to uniformly distribute the conductive agent;
the solvent with 2 percent of specific gravity is added continuously, and the viscosity is adjusted to be suitable for the coating process.
Example four
The preparation is carried out completely according to the scheme of the first example, and different from the first example, the second example and the third example, the preparation method comprises the following steps: the dry preparation method of the lithium battery electrode is characterized in that a preparation material of the lithium battery electrode consists of 90% by mass, 1% by mass, 4% by mass and 5% by mass of a mixture of an active substance, a conductive agent, a binder and a solvent;
the preparation method comprises the following steps:
quantitatively adding 90% of active substance, 1% of conductive agent and 4% of binder powder into a stirring kettle, and uniformly mixing dry powder;
adding a solvent with the specific gravity of 3 percent, wetting the powder particles to enable the surfaces of the powder particles to adsorb the solvent, and simultaneously carrying out high-intensity stirring to fully and uniformly mix the wetted powder particles;
continuously adding 1 percent of solvent, and dispersing the particle group under the action of high-speed shearing force generated by high-strength stirring to uniformly distribute the conductive agent;
the solvent with the proportion of 1 percent is added continuously, and the viscosity is adjusted to be suitable for the coating process.
Test example
And (3) testing groups: example 1, example 2, example 3, example 4 and reference example (same kind of product in market);
the test method comprises the following steps: the discharge capacity retention rate, the particle uniform dispersion rate and the conductive agent dispersion rate of examples 1 to 4 and the reference example were respectively tested;
and (3) testing results:
by combining the above data, the first to fourth effects of the embodiments of the present application are superior to those of the market reference examples, and can achieve the characteristics of high discharge performance, long service life, and low resistance.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (8)
1. The dry preparation method of the lithium battery electrode is characterized in that a preparation material of the lithium battery electrode consists of 75-90% of active substances, 0-5% of conductive agents, 5-10% of adhesives and 5-10% of solvents by mass;
the preparation method comprises the following steps:
quantitatively adding 75-90% of active substance, 0-5% of conductive agent and 5-10% of binder powder into a stirring kettle, and uniformly mixing dry powder;
adding a proper amount of solvent, wetting the powder particles to enable the surfaces of the powder particles to adsorb the solvent, and simultaneously carrying out high-intensity stirring to fully and uniformly mix the wet powder particles;
continuously adding the solvent, and dispersing the particle group under the action of high-speed shearing force generated by high-strength stirring to uniformly distribute the conductive agent;
the solvent is continuously added to adjust the viscosity to be suitable for the coating process.
2. The dry process for preparing an electrode for a lithium battery according to claim 1, wherein the stirring vessel is in the form of a single planetary mixer;
mixing and stirring the active substance, the conductive agent and the binder dry powder for 1-2 h at the rotating speed of 30-300r/min and controlling the stirring temperature at room temperature;
after the solvent is added, the high-intensity stirring and mixing time is 0.5-2 h, the rotating speed is 500-3000r/min, and the stirring temperature is controlled at 20-50 ℃;
dispersion strength due to high shear forces can be measured by the Froude number FrCharacterization by the formula
Wherein ω isrFor stirring the impeller speed, rtG is the acceleration of gravity, defined as the ratio of the centrifugal force acting on the particles to the gravitational force, and F, when the impeller radius is kept constantrDepending on the omega of the impeller, the higher the speed of rotation of the impeller, the higher the Froude number FrThe larger, i.e., the greater the high-speed dispersion strength.
3. The dry method for preparing an electrode of a lithium battery as claimed in claim 1, wherein the active material comprises a positive active material and a negative active material:
the positive active material comprises one or more of lithium iron silicate, ternary material, lithium manganate, lithium cobaltate, high nickel low cobalt and lithium nickel cobalt manganate;
the negative active material comprises one or more of natural graphite, artificial graphite, mesocarbon microbeads, graphene, lithium carbonate and soft carbon.
4. The dry method for preparing an electrode of a lithium battery as claimed in claim 1, wherein the conductive agent comprises one or more of carbon black, conductive graphite, carbon fiber, carbon nanotube and graphene.
5. The dry method for preparing an electrode of a lithium battery as claimed in claim 1, wherein the binder comprises one or more of polyvinyl alcohol, sodium carboxymethyl cellulose, fluorinated rubber, polyurethane, and polytetrafluoroethylene.
6. The dry method for preparing the lithium battery electrode according to claim 1, wherein the solvent comprises one or more of ethylene carbonate, propylene carbonate, diethyl carbonate, ethylene glycol dimethyl ether, toluene and xylene.
7. The dry method for preparing an electrode of a lithium battery as claimed in claim 1, wherein the coating process is hot-rolled by a hot-press roll, and the hot-rolling temperature of the hot-press roll is 120-240 ℃.
8. The dry process for preparing an electrode for a lithium battery according to claim 1, wherein the positive electrode and the negative electrode of the lithium battery are prepared by the method according to claims 1 to 7.
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| CN202111090020.9A CN113793917A (en) | 2021-09-15 | 2021-09-15 | Dry preparation method of lithium battery electrode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116014084A (en) * | 2023-01-16 | 2023-04-25 | 江苏大学 | Dry electrode slice, solid electrolyte membrane, preparation method and battery core of carbon-based solid lithium battery |
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| CN104577071A (en) * | 2015-01-28 | 2015-04-29 | 山东齐星新能源科技有限责任公司 | Dry-powder pulping method of lithium-ion battery |
| CN105047858A (en) * | 2015-08-25 | 2015-11-11 | 田东 | Preparation method for lithium cobalt oxide cathode slurry |
| CN106602051A (en) * | 2016-12-23 | 2017-04-26 | 山东精工电子科技有限公司 | Preparation method of negative electrode slurry for lithium titanate battery |
| CN107086292A (en) * | 2017-03-27 | 2017-08-22 | 湖北猛狮新能源科技有限公司 | A kind of high viscosity lithium ion battery slurry-stirring process |
| CN107910503A (en) * | 2017-11-29 | 2018-04-13 | 广东奥瑞特新能源设备科技有限公司 | A kind of lithium ion dry stirring technique |
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| CN116014084A (en) * | 2023-01-16 | 2023-04-25 | 江苏大学 | Dry electrode slice, solid electrolyte membrane, preparation method and battery core of carbon-based solid lithium battery |
| CN116014084B (en) * | 2023-01-16 | 2023-09-26 | 江苏大学 | Dry electrode plate of carbon-based solid lithium battery, preparation method and battery core |
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