CN112467073A - Lithium ion battery pole piece and preparation method thereof - Google Patents
Lithium ion battery pole piece and preparation method thereof Download PDFInfo
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- CN112467073A CN112467073A CN202011514542.2A CN202011514542A CN112467073A CN 112467073 A CN112467073 A CN 112467073A CN 202011514542 A CN202011514542 A CN 202011514542A CN 112467073 A CN112467073 A CN 112467073A
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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
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
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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
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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
- H01M4/1397—Processes of manufacture of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
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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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- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention relates to a lithium ion battery pole piece, which comprises a current collector, an active substance layer coated on the surface of the current collector and an electrolyte immersion channel distributed on the active substance layer; the electrolyte immersion channel comprises at least 1 transverse immersion channel and at least 1 longitudinal immersion channel perpendicular to the transverse immersion channel. The invention aims to overcome the defects of increased battery manufacturing cost and reduced electrical property caused by difficult electrolyte infiltration of a high-compaction-density electrode plate in the prior art, and provides a lithium ion battery electrode plate and a preparation method thereof.
Description
Technical Field
The invention relates to the field of chemical power supplies, in particular to a lithium ion battery pole piece and a preparation method thereof.
Background
The lithium ion battery has the advantages of small volume, light weight, long cycle life, environmental friendliness and the like, and is widely applied to the fields of portable electronic products, electric automobiles, energy storage and the like. With the increasing demand of people on the standby time of electronic products and the endurance mileage of electric vehicles, the energy density of batteries has become a subject of research in the whole industry.
The theoretical capacity of the lithium iron phosphate material in the industry at present is 172mAh/g, and the actual capacity is brought into play to be about 150 mAh/g. In order to further improve the energy density of the lithium iron phosphate battery, a lithium iron phosphate material with high compaction density is developed, however, the high compaction density often causes the reduction of the gaps of the powder electrode, the infiltration of the electrolyte is difficult, and the remaining amount of the electrolyte of the battery is reduced, so that a series of problems of long production cycle, poor cycle life and the like of the battery are caused.
In order to solve the above problems in the industry, it is a common practice to increase the time and temperature for soaking the electrolyte, so that the above problems can be alleviated to a certain extent, but the production cycle and energy consumption are both increased, resulting in an increase in cost. Some enterprises also cancel the high molecular weight solvent in the electrolyte and replace it with a low molecular weight solvent to improve the wettability of the electrolyte, which leads to degradation of certain properties of the battery, such as the high temperature performance of the battery.
Disclosure of Invention
The invention aims to overcome the defects of increased battery manufacturing cost and reduced electrical property caused by difficult electrolyte infiltration of a high-compaction-density electrode plate in the prior art, and provides a lithium ion battery electrode plate and a preparation method thereof. The method has the advantages of simple process, high production efficiency, easy operation, suitability for large-scale production and the like.
The technical scheme for realizing the purpose of the invention is as follows: a lithium ion battery pole piece comprises a current collector, an active substance layer coated on the surface of the current collector and an electrolyte immersion channel distributed on the active substance layer; the electrolyte immersion channel comprises at least 1 transverse immersion channel and at least 1 longitudinal immersion channel perpendicular to the transverse immersion channel.
Preferably, the thickness of the active material layer is 60 μm to 100 μm.
Preferably, the active material layer is prepared by uniformly mixing lithium iron phosphate, conductive carbon black and binder PVDF and coating the mixture on a current collector.
Preferably, the active material layer is prepared by uniformly mixing lithium iron phosphate, conductive carbon black, binder PVDF and solvent NMP and coating the mixture on a current collector.
Preferably, the width of the electrolyte infiltration channel is 0.3 mm-2.0 mm.
Preferably, the depth of the electrolyte infiltration channel is less than or equal to the thickness of the active material layer.
A method for preparing the lithium ion battery pole piece of claim comprises the following steps
Firstly, uniformly mixing the following four active materials of lithium iron phosphate, conductive carbon black and a binder PVDF and a solvent NMP or the following three active materials of lithium iron phosphate, conductive carbon black and the binder PVDF to prepare active material slurry;
secondly, coating the active material slurry on a current collector in an intermittent coating mode or a uniform coating mode to form an active material layer, and drying and rolling the active material layer at 120 ℃ to a thickness specified by the process;
and thirdly, carrying out laser melting on the active material layer formed in the step two in a uniform coating mode to form an electrolyte infiltration channel.
Preferably, the intermittent coating method may be achieved by a coating setup or 3D printing.
Preferably, the active material slurry for 3D printing is prepared by uniformly mixing lithium iron phosphate, conductive carbon black and binder PVDF.
Preferably, the power of the laser melting is 100W.
After the technical scheme is adopted, the invention has the following positive effects:
(1) the invention aims at the problems that the electrolyte can only permeate from two end faces to the inside of the traditional lithium ion battery, especially a wound battery, and the pole piece with high compaction density has small gap, large resistance to electrolyte infiltration and long infiltration time, so that a pole piece electrolyte infiltration channel with high compaction density is constructed.
(2) The lithium ion battery pole piece can be prepared by the intermittent coating of a coating machine, the intermittent coating of 3D printing or the uniform coating and the laser melting, and the manufacturability is high, so that the lithium ion battery pole piece is suitable for batch automatic production and the production line can be completely universal. In addition, the depth of the infiltration channel can be controlled by the laser melting process, and the 3D printing process scheme cancels the use of NMP in the traditional lithium ion battery homogenizing process, so that the environmental protection pressure of enterprises and the material cost of batteries are reduced.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which
FIG. 1 is a diagram of a pole piece corresponding to a conventional technical solution;
FIG. 2 is a first schematic diagram of a pole piece structure according to the present invention;
FIG. 3 is a second schematic diagram of the pole piece structure of the present invention;
FIG. 4 is a graph of experimental data for the present invention.
The reference numbers in the drawings are as follows: the current collector 10, the active material layer 20, the electrolyte immersion channel 30, the transverse immersion channel 31 and the longitudinal immersion channel 32.
Detailed Description
(example 1)
Referring to fig. 2, the present invention provides a lithium ion battery electrode plate, including a current collector 10, an active material layer 20 coated on the surface of the current collector 10, and an electrolyte immersion passage 30 distributed on the active material layer 20; the electrolyte immersion channel 30 comprises at least 1 transverse immersion channel 31 and at least 1 longitudinal immersion channel 32 perpendicular to the transverse immersion channel 31.
More specifically, in the present embodiment, the thickness of the active material layer 20 is 60 μm to 100 μm. The active material layer 20 is prepared by uniformly mixing lithium iron phosphate, conductive carbon black and binder PVDF and coating the mixture on the current collector 10.
More specifically, in the present embodiment, the active material layer 20 is formed by uniformly mixing lithium iron phosphate, conductive carbon black, binder PVDF, and solvent NMP, and coating the mixture on the current collector 10.
More specifically, in this embodiment, the width of the electrolyte infiltration passage 30 is 0.3mm to 2.0 mm. The depth of the electrolyte infiltration channel 30 is not more than the thickness of the active material layer 20.
(example 2)
A method for preparing a lithium ion battery pole piece comprises the following steps
Firstly, uniformly mixing the following four active materials of lithium iron phosphate, conductive carbon black and a binder PVDF and a solvent NMP or the following three active materials of lithium iron phosphate, conductive carbon black and the binder PVDF to prepare active material slurry;
secondly, coating the active material slurry on the current collector 10 in an intermittent coating mode or a uniform coating mode to form an active material layer 20, and drying and rolling the active material layer at 120 ℃ to a thickness specified by the process;
and thirdly, performing laser melting on the active material layer 20 formed in the uniform coating manner in the second step to form an electrolyte infiltration channel 30.
More specifically in this embodiment, the intermittent coating method may be implemented by a coating setting or 3D printing. The active material slurry used for 3D printing is prepared by uniformly mixing lithium iron phosphate, conductive carbon black and a binder PVDF. The laser melting power is 100W.
(example 3)
Referring to fig. 1, in a first step, an active material, namely lithium iron phosphate, conductive carbon black, a binder, namely PVDF, and a solvent, namely NMP, are uniformly mixed to prepare slurry;
secondly, uniformly coating the active material slurry on the current collector 10 by using a coating machine to form an active material layer 20;
and secondly, drying at 120 ℃, and rolling the pole piece active substance layer 20 to the thickness of 70 μm.
(example 4)
Referring to fig. 2, in the first step, an active material, namely lithium iron phosphate, conductive carbon black, a binder, namely PVDF, and a solvent, namely NMP, are uniformly mixed to prepare slurry;
and secondly, intermittently coating the active material slurry on the current collector 10 by using a coating machine to form an active material layer 20, and reserving an electrolyte infiltration passage 30 in advance in the process of coating the active material layer on the current collector 10.
More specifically, in this embodiment, a single pole piece has 1 transverse wetting channel 31 and 7 longitudinal wetting channels 32 perpendicular to the transverse wetting channel 31, the electrolyte wetting channel 30 has a width of 0.3mm, and a depth equal to the thickness of the active material layer 20. And finally drying at 120 ℃, and rolling the pole piece active substance layer 20 to the thickness of 70 μm.
(example 5)
Firstly, uniformly mixing active material lithium iron phosphate, conductive carbon black, binder PVDF and solvent NMP to prepare slurry;
in the second step, the active material layer 20 is formed by uniformly coating the active material slurry on the current collector 10 using a coater.
And thirdly, rolling the pole piece to the thickness of 70 mu m after drying at 120 ℃.
And fourthly, melting the active material layer on the surface of the current collector 10 by adopting 100W laser to form a wetting channel 30 of the electrolyte. A single pole piece is provided with 1 transverse infiltration channel 31 and 7 longitudinal infiltration channels 32 which are vertical to the transverse infiltration channel 31, the width of the electrolyte infiltration channel 30 is 0.3mm, and the depth is equal to the thickness of the active material layer 20.
(example 6)
Firstly, uniformly mixing active material lithium iron phosphate, conductive carbon black and binder PVDF to prepare slurry;
in a second step, the active material layer 20 is intermittently printed onto the current collector 10 using a 3D printer.
More specifically, in this embodiment, a single pole piece has 1 transverse wetting channel 31 and 7 longitudinal wetting channels 32 perpendicular to the transverse wetting channel 31, the width of the electrolyte wetting channel is 0.3mm, and the depth is equal to the thickness of the active material layer 20. And finally drying at 120 ℃, and rolling the pole piece active substance layer 20 to the thickness of 70 μm.
(example 7)
Referring to fig. 3, in the first step, an active material, namely lithium iron phosphate, conductive carbon black, a binder, namely PVDF, and a solvent, namely NMP, are uniformly mixed to prepare slurry;
and secondly, intermittently coating the active material slurry on the current collector 10 by using a coating machine to form an active material layer 20, and reserving an electrolyte infiltration passage 30 in advance in the process of coating the active material layer on the current collector 10.
More specifically, in this embodiment, a single pole piece has 1 transverse wetting channel 31 and 7 longitudinal wetting channels 32 perpendicular to the transverse wetting channel 31, the width of the electrolyte wetting channel 30 is 1.0mm, and the depth is the thickness of the active material layer 20. And finally drying at 120 ℃, and rolling the pole piece active substance layer 20 to the thickness of 60 mu m.
(example 8)
Firstly, uniformly mixing active material lithium iron phosphate, conductive carbon black, binder PVDF and solvent NMP to prepare slurry;
in the second step, the active material layer 20 is formed by uniformly coating the active material slurry on the current collector 10 using a coater.
And thirdly, rolling the pole piece active substance layer 20 to the thickness of 60 mu m after drying at 120 ℃.
And fourthly, melting the active material layer on the surface of the current collector 10 by adopting 100W laser to form a wetting channel 30 of the electrolyte. A single pole piece is provided with 1 transverse infiltration channel 31 and 7 longitudinal infiltration channels 32 which are vertical to the transverse infiltration channel 31, the width of the electrolyte infiltration channel 30 is 1.0mm, and the depth is 30 mu m.
(example 9)
Firstly, uniformly mixing active material lithium iron phosphate, conductive carbon black and binder PVDF to prepare slurry;
in a second step, the active material layer 20 is intermittently printed onto the current collector 10 using a 3D printer.
More specifically, in this embodiment, a single pole piece has 1 transverse wetting channel 31 and 7 longitudinal wetting channels 32 perpendicular to the transverse wetting channel 31, the width of the electrolyte wetting channel is 1.0mm, and the depth is equal to the thickness of the active material layer 20. And finally drying at 120 ℃, and rolling the pole piece active substance layer 20 to the thickness of 60 mu m.
Referring to fig. 4, according to the relevant experimental data of the present invention, it can be known that after the pole pieces constructed with the high-compaction-density electrolyte infiltration channel are assembled into the battery for liquid injection, the electrolyte rapidly reaches the inside of the battery along the electrolyte infiltration channel, the infiltration time is short, the infiltration effect is good, and meanwhile, the electrolyte infiltration channel also plays a role in storing and preserving the liquid, so that the cycle service life of the battery can be prolonged.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A lithium ion battery pole piece is characterized in that: comprises a current collector (10), an active material layer (20) coated on the surface of the current collector (10) and an electrolyte immersion passage (30) distributed on the active material layer (20); the electrolyte immersion channel (30) comprises at least 1 transverse immersion channel (31) and at least 1 longitudinal immersion channel (32) perpendicular to the transverse immersion channel (31).
2. The lithium ion battery pole piece of claim 1, wherein: the thickness of the active material layer (20) is 60 to 100 [ mu ] m.
3. The lithium ion battery pole piece of claim 2, wherein: the active material layer (20) is prepared by uniformly mixing lithium iron phosphate, conductive carbon black and a binder PVDF and coating the mixture on the current collector (10).
4. The lithium ion battery pole piece of claim 2, wherein: the active material layer (20) is prepared by uniformly mixing lithium iron phosphate, conductive carbon black, a binder PVDF and a solvent NMP and coating the mixture on a current collector (10).
5. The lithium ion battery pole piece of any one of claims 1 to 4, wherein: the width of the electrolyte infiltration channel (30) is 0.3 mm-2.0 mm.
6. The lithium ion battery pole piece of claim 5, wherein: the depth of the electrolyte infiltration channel (30) is not more than the thickness of the active material layer (20).
7. A method for preparing the lithium ion battery pole piece of any one of claims 1 to 6, characterized in that: comprises the following steps
Firstly, uniformly mixing the following four active materials of lithium iron phosphate, conductive carbon black and a binder PVDF and a solvent NMP or the following three active materials of lithium iron phosphate, conductive carbon black and the binder PVDF to prepare active material slurry;
secondly, coating the active material slurry on a current collector (10) in an intermittent coating mode or a uniform coating mode to form an active material layer (20), and drying and rolling the active material layer to the thickness specified by the process at 120 ℃;
and thirdly, carrying out laser melting on the active material layer (20) formed in the second step in a uniform coating mode to form an electrolyte infiltration channel (30).
8. The method of claim 6, wherein: the batch coating method may be achieved by a coating setup or 3D printing.
9. The method of claim 8, wherein: the active material slurry used for 3D printing is prepared by uniformly mixing lithium iron phosphate, conductive carbon black and a binder PVDF.
10. The method of claim 6, wherein: the laser melting power is 100W.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011514542.2A CN112467073A (en) | 2020-12-21 | 2020-12-21 | Lithium ion battery pole piece and preparation method thereof |
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| CN202011514542.2A CN112467073A (en) | 2020-12-21 | 2020-12-21 | Lithium ion battery pole piece and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114094037A (en) * | 2021-10-18 | 2022-02-25 | 深圳市首通新能源科技有限公司 | Pole piece, electric core and cylindrical battery |
| CN114122322A (en) * | 2021-11-25 | 2022-03-01 | 珠海冠宇电池股份有限公司 | Battery pole piece and battery |
| CN114203962A (en) * | 2021-12-13 | 2022-03-18 | 珠海冠宇动力电池有限公司 | Pole piece, battery core and battery |
| CN114497445A (en) * | 2022-02-24 | 2022-05-13 | 东莞新能安科技有限公司 | Pole piece, electrochemical device and electric equipment |
| CN115995526A (en) * | 2023-03-24 | 2023-04-21 | 宁德新能源科技有限公司 | Electrode assembly, electrochemical device and electric equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114094037A (en) * | 2021-10-18 | 2022-02-25 | 深圳市首通新能源科技有限公司 | Pole piece, electric core and cylindrical battery |
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| CN114497445A (en) * | 2022-02-24 | 2022-05-13 | 东莞新能安科技有限公司 | Pole piece, electrochemical device and electric equipment |
| CN114497445B (en) * | 2022-02-24 | 2024-03-12 | 东莞新能安科技有限公司 | Pole piece, electrochemical device and electric equipment |
| CN115995526A (en) * | 2023-03-24 | 2023-04-21 | 宁德新能源科技有限公司 | Electrode assembly, electrochemical device and electric equipment |
| CN115995526B (en) * | 2023-03-24 | 2024-03-12 | 宁德新能源科技有限公司 | Electrode assembly, electrochemical device and electric equipment |
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