CN112952042A - Preparation method of paste-mixing brick for lithium ion battery pole piece - Google Patents
Preparation method of paste-mixing brick for lithium ion battery pole piece Download PDFInfo
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- CN112952042A CN112952042A CN202110250252.XA CN202110250252A CN112952042A CN 112952042 A CN112952042 A CN 112952042A CN 202110250252 A CN202110250252 A CN 202110250252A CN 112952042 A CN112952042 A CN 112952042A
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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
- H01M4/13—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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0433—Molding
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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
- H01M4/04—Processes of manufacture in general
- H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- 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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- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention relates to a preparation method of a paste-mixing brick for a lithium ion battery pole piece, which comprises the following steps: (1) preparing a material paste: dry-mixing the cathode material raw material or the anode material raw material, and adding a solvent into the dry-mixed material to obtain a paste; (2) filling the material paste into a mold: adding the prepared material paste into a battery pole piece die, wherein a substrate sheet is arranged in the die, the die is divided into an upper die and a lower die, the substrate is placed on the lower die, and after the material paste is coated on the substrate, the upper die is subjected to cavity closing and pressing; (3) drying and compacting: and heating and drying the pasty pole piece filled into the die cavity, and applying certain pressure in the drying process to obtain the lithium ion battery pole piece. Compared with the prior art, the invention has the advantages of simple process, low investment cost, high investment benefit, greatly reduced cost of the power battery, contribution to popularization and application of the electric automobile and the like.
Description
Technical Field
The invention relates to the field of lithium ion batteries, in particular to a preparation method of a paste-mixing brick for a lithium ion battery pole piece.
Background
In recent years, the application range of lithium ion batteries is more and more extensive, and lithium ion batteries are widely applied to energy storage power systems such as hydraulic power, firepower, wind power and solar power stations, and a plurality of fields such as electric tools, electric bicycles, electric motorcycles, electric automobiles, military equipment and aerospace. However, the cost of lithium batteries is high, and the processing cost and the raw material cost are main factors. The lithium battery has the advantages of complex manufacturing process, longer process route, large equipment investment and larger operation difficulty.
In the conventional manufacturing process of the lithium ion battery pole piece, as shown in fig. 2, a batching system, a stirrer and slurry system, a coating machine, an areal density tester, a roller press, a laser thickness gauge, a splitting machine, a die-cutting machine, a CCD and other equipment are required, active materials, conductive agents, adhesive glue and other solvents are uniformly mixed and dispersed by the stirrer or a dispersing machine to prepare electrode slurry capable of flowing freely, then the electrode slurry is uniformly coated on a copper foil or aluminum foil substrate and dried to form a battery pole roll, and then the battery pole roll is sequentially rolled, cut and die-cut to prepare the battery pole piece.
In the existing lithium ion battery pole piece manufacturing process, active substances, conductive agents, bonding glue and the like are uniformly mixed and dispersed with a solvent through a stirrer or a dispersion machine to prepare electrode slurry capable of flowing freely, the uniformity of the conductive agents dispersed in the solvent is difficult to control, the stability and the fluidity of the electrode slurry are greatly changed, the slurry is conveyed remotely and has the problems of caking, precipitation and the like, and the cleaning is difficult when the batch is changed; when the slurry is coated on the base material, the thickness of the film layer is uneven, and the thickness uniformity of the battery pole piece manufactured by the subsequent process is influenced.
In addition, in the drying process, the solvent in the electrode slurry can be volatilized, so that the film layer formed on the surface of the pole piece substrate is cracked; the problems of belt breakage, demoulding, roller sticking and the like exist in the rolling treatment process, and the consistency of the compaction density of the film layer is poor; after slitting and die cutting, the base material of the pole piece is exposed, so that a large amount of burrs exist on the edge of the pole piece of the ion battery. The whole manufacturing process of the battery pole piece is tedious and tedious, the process is complex, the equipment is more and huge, and the investment cost is very high.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the paste-mixing brick-making preparation method of the lithium ion battery pole piece, which has the advantages of simple process, low investment cost, high investment benefit, greatly reduced cost of the power battery and contribution to popularization and application of the electric automobile.
The purpose of the invention can be realized by the following technical scheme:
a preparation method of a paste mixing brick for a lithium ion battery pole piece comprises the following steps:
(1) preparing a material paste: dry-mixing the cathode material raw material or the anode material raw material, and adding a solvent into the dry-mixed material to obtain a paste; different adding amounts are obtained according to different types of powder experiments; mixing the powder and the solvent by a machine to prepare paste;
(2) filling the material paste into a mold: adding the prepared material paste into a battery pole piece die, wherein a substrate sheet is arranged in the die, the die is divided into an upper die and a lower die, the substrate is placed on the lower die, and after the material paste is coated on the substrate, the upper die is subjected to cavity closing and pressing; designing a mold meeting the requirements according to the requirements of a process product, putting the manufactured paste into the designed mold, pressing the paste and a base material, uniformly coating the paste on the base material finally, and separately manufacturing a positive plate and a negative plate;
(3) drying and compacting: and heating and drying the pasty pole piece filled into the die cavity, and applying certain pressure in the drying process to obtain the lithium ion battery pole piece. The pressure range is related according to the compaction density of the pole piece, and parameters in different ranges can be set according to different product requirements.
Further, the raw materials of the negative electrode material comprise graphite, a conductive agent, a thickening agent and a binder.
Further, the conductive agent is Keqin superconducting Carbon black (Carbon ECP), the thickening agent is sodium carboxymethylcellulose (CMC), and the binder is styrene-butadiene rubber latex (SBR).
Further, the solvent is water, and the adding amount of the solvent is 3-30% of the weight of the dry-mixed materials, and the optimal adding amount is 5-20%. The viscosity of the paste is 5000-6000cps (25 ℃, 3 parts of a rotor). The weight of water needs to be properly adjusted to meet the requirement of viscosity; particular attention is paid to the effect of temperature and humidity on viscosity.
Further, the base material is copper foil.
Further, the cathode material comprises LiCoO2A conductive agent and a binder.
Further, the conductive agent is Carbon ECP, and the adhesive is PVDF 761.
Further, the solvent is NMP, and the adding amount is 3-30% of the weight of the dry-mixed materials, and optimally 5-20%. The viscosity of the paste is 6000cps (25 deg.C, rotor 3). The weight of NMP needs to be properly adjusted to meet the requirement of viscosity; note the effect of temperature, humidity on viscosity.
Further, the substrate is an aluminum foil.
Further, the dry mixing time is 1-10min, preferably 2-6min, the heating and drying is a contact type or a non-contact type, and the pressure is 10-200 MPa. The pressure may be constant or gradually increased.
The manufacturing method of the battery pole piece greatly simplifies the process flow, does not need a large number of high-precision mixers, does not need excessive solvents to prepare slurry, and does not have the problems of slurry precipitation, caking and the like; the pole piece coating process is directly cancelled, so that the problems of uneven pole piece coating thickness or surface density are solved, and the phenomenon of drying and cracking is avoided; the rolling procedure is carried out without a rolling machine, so that the problems of roller sticking, demoulding and the like do not exist; the problem of headaches in the industry is solved without cutting or die cutting, and the safety performance of the battery is greatly improved. The process is simple, the investment cost is low, the investment benefit is high, the cost of the power battery is greatly reduced, and the popularization and the application of the electric automobile are facilitated.
Compared with the prior art, the invention has the following advantages:
(1) the battery raw materials are simply and quickly prepared into paste through the high-efficiency paste mixing machine, excessive solvent is not required to be added, and particularly, the use amount of NMP is reduced, so that the energy conservation and the environmental protection are facilitated;
(2) the paste is easy to convey and shape, and the problems of difficult slurry conveying and precipitation and caking in the prior art are solved;
(3) the material paste is directly weighed and molded without using a coating machine, so that the drying of a coating film is reduced, the inconsistency of coating thickness is avoided, and the problems of pole piece cracking and the like are avoided;
(4) the material paste after being filled into the die is directly dried and compacted without processes of rolling, slitting, die cutting and the like, so that the problem of belt breakage caused by rolling is avoided, and the product quality rate and the material utilization rate are greatly improved; the process of slitting and die cutting is omitted, the problem of headaches in the industry is solved, and the safety performance of the battery is greatly improved. The process is simple, the investment cost is low, the investment benefit is high, the cost of the power battery is greatly reduced, and the popularization and the application of the electric automobile are facilitated.
Drawings
FIG. 1 is a schematic diagram of a method for preparing a battery pole piece according to the present invention;
fig. 2 illustrates a conventional method for manufacturing a battery electrode plate.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
A method for preparing a paste-combining brick for a lithium ion battery pole piece mainly comprises three steps of paste preparation, material paste filling into a mold, drying and compacting.
Firstly, preparing paste, namely dry mixing raw material powder for 2-6min according to a process proportion; adding a solvent into the dry mixed material, and obtaining different adding amounts according to different types of powder experiments; the powder and the solvent are mixed by a machine to prepare the paste.
Wherein the anode raw material comprises: graphite, conductive agent, thickening agent (CMC), binder (SBR), copper foil; the specific dosage is as follows: negative electrode material (graphite): 94.5%, conductive agent (Carbon ECP): 1.0% (ketjen superconducting carbon black), binder (SBR): 2.25% (SBR ═ styrene butadiene rubber latex), thickener (CMC): 2.25% (CMC ═ sodium carboxymethylcellulose).
Finally, the viscosity of the cathode is controlled to be 5000-; particular attention is paid to the effect of temperature and humidity on viscosity.
Wherein, the anode raw material comprises: LiCoO2Conductive agent, adhesive (PVDF), aluminum foil; the specific dosage is as follows: LiCoO2(10 μm) 96.0%, conductive agent (Carbon ECP): 2.0%, adhesive (PVDF 761): 2.0 percent.
Finally, the viscosity of the positive electrode is controlled to be 6000cps (the temperature is 25 ℃, and the rotor is 3); the weight of NMP needs to be properly adjusted to meet the requirement of viscosity; attention is paid to the influence of temperature and humidity on viscosity
And secondly, filling the material paste into a mold, weighing and metering the prepared material paste, and adding the material paste into a special battery pole piece mold, wherein a substrate piece which is filled in advance and is molded according to a specified size is arranged in the mold.
The positive electrode base material is an aluminum foil, the negative electrode base material is a copper foil, a mould meeting the requirements is designed according to the requirements of technological products, the manufactured material paste is placed in the designed mould and pressed with the base material, the material paste is evenly coated on the base material finally, and the positive electrode plate and the negative electrode plate are separately manufactured; the die is divided into an upper die and a lower die, after the base material is placed on the lower die, the base material is evenly coated with the material paste, and then the upper die is pressed in a cavity closing mode.
And thirdly, drying and compacting, carrying out contact or non-contact heating and drying on the pasty pole piece filled into the die cavity, and applying certain pressure in the drying process to finally obtain the lithium ion battery pole piece. The pressure may be constant or gradually increased. The pressure range is related according to the compaction density of the pole piece, and parameters in different ranges can be set according to different product requirements, and the specific conditions can be shown in the following table:
a positive electrode material, a negative electrode material and a separatorFilm formation: celgard 2400 assembles into the laminate polymer battery, adopts the electrolyte as: 1M LiPF6+ EC: DEC ═ 1: 1 (volume ratio), the electrochemical performance test is carried out on a blue battery tester, 5 groups of parallel tests are arranged in total, and the battery performance results are as follows:
| numbering | Capacity retention rate after 600 times of room temperature cycle% | Capacity retention rate% after 600 cycles at 45% |
| Soft package battery 1 | 96 | 93 |
| Soft package battery 2 | 97 | 91 |
| Soft package battery 3 | 95 | 91 |
| Laminate polymer battery 4 | 95 | 90 |
| Soft package battery 5 | 94 | 90 |
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (10)
1. A preparation method of a paste mixing brick for a lithium ion battery pole piece is characterized by comprising the following steps:
(1) preparing a material paste: dry-mixing the cathode material raw material or the anode material raw material, and adding a solvent into the dry-mixed material to obtain a paste;
(2) filling the material paste into a mold: adding the prepared material paste into a battery pole piece die, wherein a substrate sheet is arranged in the die, the die is divided into an upper die and a lower die, the substrate is placed on the lower die, and after the material paste is coated on the substrate, the upper die is subjected to cavity closing and pressing;
(3) drying and compacting: and heating and drying the pasty pole piece filled into the die cavity, and applying certain pressure in the drying process to obtain the lithium ion battery pole piece.
2. The method for preparing a paste-mixing brick for a lithium ion battery pole piece according to claim 1, wherein the raw materials of the negative electrode material comprise graphite, a conductive agent, a thickening agent and a binder.
3. The method for preparing a paste-mixing brick for a lithium ion battery pole piece according to claim 2, wherein the conductive agent is Keqin superconducting carbon black, the thickening agent is sodium carboxymethylcellulose, and the binder is styrene butadiene rubber latex.
4. The method for preparing the paste-mixing brick for the lithium ion battery pole piece as claimed in claim 2, wherein the solvent is water, the addition amount is 3-30% of the weight of the dry-mixed material, and the viscosity of the paste is 5000-6000cps (25 ℃, 3 ℃ rotor).
5. The paste mixing and brick making method for the lithium ion battery pole piece according to claim 2, wherein the base material is copper foil.
6. The method for preparing a brick from mixed paste of lithium ion battery pole piece according to claim 1, wherein the raw material of the positive electrode material comprises LiCoO2A conductive agent and a binder.
7. The method for preparing a paste-combining brick for a lithium ion battery pole piece according to claim 6, wherein the conductive agent is Carbon ECP, and the adhesive is PVDF 761.
8. The method for preparing the paste-mixing brick for the lithium ion battery pole piece according to claim 6, wherein the solvent is NMP, the addition amount is 3-30% of the weight of the dry-mixed material, and the viscosity of the paste is 6000cps (25 ℃ and 3 ℃ on a rotor).
9. The method for preparing a paste-combining brick for a lithium ion battery pole piece according to claim 6, wherein the substrate is aluminum foil.
10. The method for preparing the paste-mixing brick for the lithium ion battery pole piece according to claim 1, wherein the dry mixing time is 1-10min, the heating and drying are in a contact type or a non-contact type, and the pressure is 10-200 MPa.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113517421A (en) * | 2021-07-12 | 2021-10-19 | 四川无量智慧道桥科技有限公司 | Lithium battery pole piece die forming and die casting system and die casting process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113517421A (en) * | 2021-07-12 | 2021-10-19 | 四川无量智慧道桥科技有限公司 | Lithium battery pole piece die forming and die casting system and die casting process |
| CN113517421B (en) * | 2021-07-12 | 2022-06-21 | 四川无量智慧道桥科技有限公司 | Lithium battery pole piece die forming and die casting system and die casting process |
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Application publication date: 20210611 |