CN113488617A - Preparation method of lithium ion battery pole piece - Google Patents
Preparation method of lithium ion battery pole piece Download PDFInfo
- Publication number
- CN113488617A CN113488617A CN202110501393.4A CN202110501393A CN113488617A CN 113488617 A CN113488617 A CN 113488617A CN 202110501393 A CN202110501393 A CN 202110501393A CN 113488617 A CN113488617 A CN 113488617A
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- China
- Prior art keywords
- pole piece
- base material
- battery pole
- lithium ion
- ion battery
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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
-
- 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
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
-
- 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 preparation method of a lithium ion battery pole piece, which comprises the following steps: (1) unreeling a base material: unreeling the substrate from a rolling state; (2) rectifying deviation: correcting the motion track in the running process of the base material; (3) laser coding: carrying out intensive punching on the surface of the base material; (4) static electricity removal: eliminating the static electricity on the base material after the laser coding; (5) coating: uniformly coating the stirred electrode slurry on a base material through an extrusion die head; (6) baking: drying the coated base material to form a lithium ion battery pole piece; (7) and (3) weight measurement: carrying out weight detection and recording on the battery pole piece; (8) rectifying deviation: correcting the motion track in the running process of the battery pole piece; (9) winding: and winding and storing the prepared lithium ion battery pole piece. Compared with the prior art, the adhesive force of the slurry on the base material is improved, the powder falling phenomenon is improved, and the internal resistance of the electrode is reduced.
Description
Technical Field
The invention relates to the field of lithium battery materials, in particular to a preparation method of a lithium ion battery pole piece.
Background
In the production process of the lithium battery, coating is a crucial process, pole piece coating has important significance on the capacity, consistency, safety and the like of the lithium battery, the coating effect has important influence on the capacity, internal resistance, cycle life and safety of the battery, and according to incomplete statistics: the proportion of battery failure caused by the pole piece coating process to the lithium battery failure caused by all reasons is more than 10%, so that the pole pieces are ensured to be uniformly coated.
The pole piece coating generally refers to a process of uniformly coating the uniformly stirred slurry on a current collector and drying an organic solvent in the slurry. The selection and control parameters of the coating mode have important influence on the performance of the lithium ion battery, which is mainly shown in the following steps: coating drying temperature control, coating areal density, coating size and coating thickness, but research on these process parameters has become mature.
The existing preparation method of the lithium ion battery pole piece comprises unreeling → rectifying → coating → baking → weight measurement → rectifying → reeling, and the process has the following problems: (1) the adhesive force of the two surfaces after coating is different, so that the peeling strength of the two surfaces of the pole piece is different; (2) the coated pole piece is seriously pulverized through baking, rolling and the like, and the pulverized powder has important influence on the capacity, the internal resistance, the cycle life and the safety of the battery.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a preparation method of a lithium ion battery pole piece, which improves the adhesive force of slurry on a base material, improves the powder dropping phenomenon and reduces the internal resistance of the electrode.
The purpose of the invention can be realized by the following technical scheme:
a preparation method of a lithium ion battery pole piece comprises the following steps:
(1) unreeling a base material: unreeling the substrate from a rolling state; the main function is to provide a base material for the whole process;
(2) rectifying deviation: correcting the motion track in the running process of the base material; the main function is to ensure that the base material is centered and does not deviate in the moving process;
(3) laser coding: carrying out intensive punching on the surface of the base material; the laser parameters are set according to requirements, the main function is to improve the adhesive force of coating, so that the coating dusting phenomenon is reduced, and meanwhile, the laser has a good effect on extension during rolling, and the hole positions can effectively release part of internal stress under the action of internal stress during rolling;
(4) static electricity removal: eliminating the static electricity on the base material after the laser coding; the main function is to prevent the surface of the substrate from generating static electricity during coating, and dust, air impurities and the like can be adsorbed to cause coating defects;
(5) coating: uniformly coating the stirred electrode slurry on a base material through an extrusion die head;
(6) baking: drying the coated base material to form a lithium ion battery pole piece; the method has the main effects that the solvent coated in the slurry on the surface of the foil is evaporated to meet the process requirements, and the wind speed, wind pressure, temperature and the like need to be controlled;
(7) and (3) weight measurement: carrying out weight detection and recording on the battery pole piece; controlling the whole coating weight;
(8) rectifying deviation: correcting the motion track in the running process of the battery pole piece; the method has the main effects that the uniformity of winding the pole piece is ensured, and a good film roll is provided for the next procedure;
(9) winding: and winding and storing the prepared lithium ion battery pole piece.
Further, the substrate comprises a positive electrode substrate and/or a negative electrode substrate.
Furthermore, the thickness of the positive electrode base material is 10-12 μm, and the thickness tolerance is 0.4 μm.
Furthermore, the surface tension of the anode substrate is 28-32dyn, the tensile strength is 180-210MPa, and the elongation is 1.4-4.0%.
Further, the thickness of the negative electrode base material is 6-10 μm.
Further, the heat resistance of the negative electrode base material: the surface is free of oxidation at 180 ℃ for 60min, the surface has hydrophilicity, the tensile strength is more than or equal to 250Mpa, the elongation is more than or equal to 2.5%, the Ra of the single-side drum surface is less than or equal to 0.4 mu m, and the Rz of the double-side drum surface is 1-2 mu m.
Furthermore, the material of the anode base material is aluminum, and the material of the cathode base material is copper.
Furthermore, the drilling depth of the laser coding is 2-3 μm when the thickness of the base material is larger than 10 μm.
Furthermore, the laser coding has the drilling depth of 1-2 μm when the thickness of the base material is 6-10 μm.
Further, the baking temperature is 75-125 ℃. The temperature is determined according to different systems and pole pieces, the opening and closing degree is controlled mainly by a mechanical valve, and the opening and closing degree is changed due to different sections, lengths and heating modes of the oven.
Compared with the prior art, the invention has the following advantages:
(1) according to the invention, the surface of the base material is densely perforated, so that the coating adhesive force can be improved, the coating dusting phenomenon is reduced, and the rolling roller has a good effect on extension during rolling, and the hole positions can effectively release part of internal stress under the action of internal stress during rolling;
(2) after the punching is finished, the static electricity on the base material is eliminated, so that the coating defects caused by the fact that the static electricity is generated on the surface of the base material during coating and dust, air impurities and the like are adsorbed are prevented, and the advantages brought by laser coding are converted to the greatest extent;
(3) the coating of the invention can not cause visible cracks and powder falling and foil leakage, and the peel strength of the electrode plate is greater than that of the prior art.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1: preparation of positive battery pole piece
A preparation method of a positive pole piece of a lithium ion battery comprises the following steps:
(1) unreeling a base material: unwinding the anode substrate from a winding state; the main function is to provide a base material for the whole process; the anode substrate is aluminum foil with a thickness of 10-12 μm, a thickness tolerance of 0.4 μm, a surface tension of 28-32dyn, a tensile strength of 180-210MPa, and an elongation of 1.4-4.0%.
(2) Rectifying deviation: correcting the motion track in the running process of the anode base material; the main function is to ensure that the base material is centered and does not deviate in the moving process;
(3) laser coding: carrying out intensive punching on the surface of the anode base material, wherein the punching depth is 2-3 mu m; the laser parameters are set according to requirements, the main function is to improve the adhesive force of coating, so that the coating dusting phenomenon is reduced, and meanwhile, the laser has a good effect on extension during rolling, and the hole positions can effectively release part of internal stress under the action of internal stress during rolling; the surface roughness of the base material is improved after laser coding, the thickness of the base material is smaller than that of the original base material, the internal resistance of the base material is reduced except for other factors, and the effective capacity of the battery is improved;
(4) static electricity removal: eliminating static electricity on the anode base material after laser coding; the main function is to prevent the surface of the substrate from generating static electricity during coating, and dust, air impurities and the like can be adsorbed to cause coating defects;
(5) coating: uniformly coating the stirred electrode slurry on a base material through an extrusion die head;
(6) baking: drying the coated anode substrate to form an anode piece of the lithium ion battery; the method has the main effects that the solvent coated in the slurry on the surface of the foil is evaporated to meet the process requirements, and the wind speed, wind pressure, temperature and the like need to be controlled; the baking temperature is 75-125 ℃. The temperature is determined according to different systems and pole pieces, the opening and closing degree is controlled mainly by a mechanical valve, and the opening and closing degree is changed due to different sections, lengths and heating modes of the oven;
(7) and (3) weight measurement: carrying out weight detection and recording on the positive pole piece of the battery; controlling the whole coating weight;
(8) rectifying deviation: correcting the motion track in the running process of the positive pole piece of the battery; the method has the main effects that the uniformity of winding the pole piece is ensured, and a good film roll is provided for the next procedure;
(9) winding: and winding and storing the prepared positive pole piece of the lithium ion battery.
In the embodiment, the peel strength of the prepared positive pole piece is 10-24N/m, cracks and powder and foil shedding phenomena which are invisible to naked eyes are avoided, the steps of laser coding and static electricity removal are not carried out on the basis of the prior art, the cracks and powder and foil shedding phenomena which are visible to naked eyes after coating are avoided, and the peel strength is only 7-18N/m.
Example 2: preparation of negative electrode battery pole piece
A preparation method of a lithium ion battery negative pole piece comprises the following steps:
(1) unreeling a base material: unreeling the cathode substrate from a reeling state; the main function is to provide a base material for the whole process; the negative electrode base material is copper foil, the thickness is 6-10 μm, and the heat resistance is as follows: the surface is free of oxidation at 180 ℃ for 60min, the surface has hydrophilicity, the tensile strength is more than or equal to 250Mpa, the elongation is more than or equal to 2.5%, the Ra of the single-side drum surface is less than or equal to 0.4 mu m, and the Rz of the double-side drum surface is 1-2 mu m.
(2) Rectifying deviation: correcting the motion track in the running process of the cathode substrate; the main function is to ensure that the base material is centered and does not deviate in the moving process;
(3) laser coding: carrying out intensive punching on the surface of the negative electrode base material, wherein the punching depth is 1-2 mu m; the laser parameters are set according to requirements, the main function is to improve the adhesive force of coating, so that the coating dusting phenomenon is reduced, and meanwhile, the laser has a good effect on extension during rolling, and the hole positions can effectively release part of internal stress under the action of internal stress during rolling; the surface roughness of the base material is improved after laser coding, the thickness of the base material is smaller than that of the original base material, the internal resistance of the base material is reduced except for other factors, and the effective capacity of the battery is improved;
(4) static electricity removal: eliminating the static electricity on the cathode substrate after laser coding; the main function is to prevent the surface of the substrate from generating static electricity during coating, and dust, air impurities and the like can be adsorbed to cause coating defects;
(5) coating: uniformly coating the stirred electrode slurry on a base material through an extrusion die head;
(6) baking: drying the coated negative electrode base material to form a negative electrode plate of the lithium ion battery; the method has the main effects that the solvent coated in the slurry on the surface of the foil is evaporated to meet the process requirements, and the wind speed, wind pressure, temperature and the like need to be controlled; the baking temperature is 75-125 ℃. The temperature is determined according to different systems and pole pieces, the opening and closing degree is controlled mainly by a mechanical valve, and the opening and closing degree is changed due to different sections, lengths and heating modes of the oven;
(7) and (3) weight measurement: carrying out weight detection and recording on the battery negative pole piece; controlling the whole coating weight;
(8) rectifying deviation: correcting the motion track in the running process of the battery negative pole piece; the method has the main effects that the uniformity of winding the pole piece is ensured, and a good film roll is provided for the next procedure;
(9) winding: and winding and storing the prepared lithium ion battery negative pole piece.
In the embodiment, the peel strength of the prepared negative pole piece is 8-20N/m, cracks and powder and foil shedding phenomena which are invisible to naked eyes are avoided, the steps of laser coding and static electricity removal are not needed on the basis of the embodiment in the prior art, the cracks and powder and foil shedding phenomena which are visible to naked eyes after coating are avoided, and the peel strength is only 5-15N/m.
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 lithium ion battery pole piece is characterized by comprising the following steps:
(1) unreeling a base material: unreeling the substrate from a rolling state;
(2) rectifying deviation: correcting the motion track in the running process of the base material;
(3) laser coding: carrying out intensive punching on the surface of the base material;
(4) static electricity removal: eliminating the static electricity on the base material after the laser coding;
(5) coating: uniformly coating the stirred electrode slurry on a base material through an extrusion die head;
(6) baking: drying the coated base material to form a lithium ion battery pole piece;
(7) and (3) weight measurement: carrying out weight detection and recording on the battery pole piece;
(8) rectifying deviation: correcting the motion track in the running process of the battery pole piece;
(9) winding: and winding and storing the prepared lithium ion battery pole piece.
2. The method of claim 1, wherein the substrate comprises a positive substrate and/or a negative substrate.
3. The method for preparing a lithium ion battery pole piece according to claim 2, wherein the thickness of the positive electrode substrate is 10-12 μm, and the thickness tolerance is 0.4 μm.
4. The method as claimed in claim 3, wherein the surface tension of the positive electrode substrate is 28-32dyn, the tensile strength is 180-210MPa, and the elongation is 1.4-4.0%.
5. The method for preparing the lithium ion battery pole piece according to claim 2, wherein the thickness of the negative electrode substrate is 6-10 μm.
6. The preparation method of the lithium ion battery pole piece according to claim 5, wherein the heat resistance of the negative electrode substrate is as follows: the surface is free of oxidation at 180 ℃ for 60min, the surface has hydrophilicity, the tensile strength is more than or equal to 250Mpa, the elongation is more than or equal to 2.5%, the Ra of the single-side drum surface is less than or equal to 0.4 mu m, and the Rz of the double-side drum surface is 1-2 mu m.
7. The method for preparing an electrode plate of a lithium ion battery according to any one of claims 2 to 6, wherein the material of the positive electrode substrate is aluminum, and the material of the negative electrode substrate is copper.
8. The method for preparing the lithium ion battery pole piece according to claim 1, wherein the laser coding has a punching depth of 2-3 μm when the thickness of the base material is greater than 10 μm.
9. The method for preparing the lithium ion battery pole piece according to claim 1, wherein the laser coding has a punching depth of 1-2 μm when the thickness of the base material is 6-10 μm.
10. The method for preparing a lithium ion battery pole piece according to claim 1, wherein the baking temperature is 75-125 ℃.
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| CN202110501393.4A CN113488617A (en) | 2021-05-08 | 2021-05-08 | Preparation method of lithium ion battery pole piece |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009021379A1 (en) * | 2007-08-10 | 2009-02-19 | Shenzhen Bak Battery Co., Ltd | A current collector of lithium ion battery, a high-capacity cylindrical lithium ion battery and the preparation method of the same |
| JP2013151065A (en) * | 2013-05-13 | 2013-08-08 | Showa Seiko Kk | Porous metal foil roll forming device |
| JP2014204069A (en) * | 2013-04-09 | 2014-10-27 | Ｊｍエナジー株式会社 | Electrode for power storage device and lithium ion capacitor |
| CN107378262A (en) * | 2017-07-20 | 2017-11-24 | 深圳鸿元智能科技有限公司 | Lithium battery collector drilling method and laser drilling device |
| CN207009551U (en) * | 2017-07-20 | 2018-02-13 | 深圳鸿元智能科技有限公司 | A kind of coating machine with perforating device |
| CN207888780U (en) * | 2018-02-13 | 2018-09-21 | 宁德时代新能源科技股份有限公司 | Collector punch device |
| CN210668535U (en) * | 2019-08-30 | 2020-06-02 | 长沙锂安能电子科技有限公司 | Three-dimensional substrate integrated manufacturing equipment |
-
2021
- 2021-05-08 CN CN202110501393.4A patent/CN113488617A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009021379A1 (en) * | 2007-08-10 | 2009-02-19 | Shenzhen Bak Battery Co., Ltd | A current collector of lithium ion battery, a high-capacity cylindrical lithium ion battery and the preparation method of the same |
| JP2014204069A (en) * | 2013-04-09 | 2014-10-27 | Ｊｍエナジー株式会社 | Electrode for power storage device and lithium ion capacitor |
| JP2013151065A (en) * | 2013-05-13 | 2013-08-08 | Showa Seiko Kk | Porous metal foil roll forming device |
| CN107378262A (en) * | 2017-07-20 | 2017-11-24 | 深圳鸿元智能科技有限公司 | Lithium battery collector drilling method and laser drilling device |
| CN207009551U (en) * | 2017-07-20 | 2018-02-13 | 深圳鸿元智能科技有限公司 | A kind of coating machine with perforating device |
| CN207888780U (en) * | 2018-02-13 | 2018-09-21 | 宁德时代新能源科技股份有限公司 | Collector punch device |
| CN210668535U (en) * | 2019-08-30 | 2020-06-02 | 长沙锂安能电子科技有限公司 | Three-dimensional substrate integrated manufacturing equipment |
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