WO2024146650A1 - 电极片及电池 - Google Patents
电极片及电池 Download PDFInfo
- Publication number
- WO2024146650A1 WO2024146650A1 PCT/CN2024/070957 CN2024070957W WO2024146650A1 WO 2024146650 A1 WO2024146650 A1 WO 2024146650A1 CN 2024070957 W CN2024070957 W CN 2024070957W WO 2024146650 A1 WO2024146650 A1 WO 2024146650A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- active layer
- area
- electrode sheet
- active
- empty foil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/26—Electrodes characterised by their structure, e.g. multi-layered, porosity or surface features
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/22—Electrodes
- H01G11/26—Electrodes characterised by their structure, e.g. multi-layered, porosity or surface features
- H01G11/28—Electrodes characterised by their structure, e.g. multi-layered, porosity or surface features arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/66—Current collectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/66—Current collectors
- H01G11/70—Current collectors characterised by their structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/74—Terminals, e.g. extensions of current collectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
- H01G11/86—Processes for the manufacture of hybrid or EDL capacitors, or components thereof specially adapted for electrodes
-
- 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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- 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
- H01M2004/021—Physical characteristics, e.g. porosity, surface area
-
- 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
Definitions
- the present application belongs to the field of battery technology, and specifically relates to an electrode sheet and a battery.
- Lithium-ion batteries are widely used in consumer electronic products due to their high energy density and high output power.
- a single-sided welding electrode is used, that is, only part of the active material layer on one side of the current collector is removed to expose the current collector to connect the electrode, so that the active material layer on the other side is retained.
- the present application provides an electrode sheet, which arranges a first active layer on the opposite side of the empty foil area so that the porosity of the first active layer is greater than the porosity of the second active layer.
- the electrode sheet is applied to a battery, which can ensure that the first active layer absorbs more electrolyte, thereby improving the cycle performance and safety performance of the battery.
- the present application provides a battery, which has excellent cycle performance and safety performance due to the inclusion of the above-mentioned electrode sheet.
- an electrode sheet comprising a current collector, a first active layer, a second active layer and a tab
- the current collector comprises a first surface and a second surface arranged opposite to each other; the first surface is provided with a hollow foil area, and the second surface is provided with a first active layer; a vertical projection of the first active layer on the first surface at least partially overlaps with the hollow foil area; wherein the hollow foil area is provided with a tab; the first surface is further provided with a first other active material layer area located outside the hollow foil area, and the first other active material layer area is coated with a second active layer;
- the second surface is further provided with a second other active material layer region located outside the first active layer, and the second other active material layer region is coated with a second active layer;
- the porosity of the first active layer is A
- the porosity of the second active layer is B
- B:A 1:(1.1-10).
- the thickness of the first active layer is greater than the thickness of the second active layer; and/or the compaction density of the first active layer is less than the compaction density of the second active layer.
- the first other active material layer area is located on at least two opposite sides of the empty foil area.
- the electrode tab extends along a first direction, and includes a connecting portion located within the empty foil area and an extending portion located outside the current collector.
- FIG3 is a schematic diagram of a top view of an electrode sheet according to an embodiment of the present application.
- FIG4 is a schematic diagram of a top view of an electrode sheet according to another embodiment of the present application.
- the X direction is the length direction of the current collector (the second direction)
- the Y direction is the width direction of the current collector (the first direction)
- the Z direction is the thickness direction of the current collector.
- the present application provides an electrode sheet, including a current collector 1, a first active layer 1021, a second active layer 1031 and a tab 2, wherein the current collector 1 includes a first surface 11 and a second surface 12 arranged opposite to each other; the first surface 11 is provided with a hollow foil area 101, and the second surface 12 is provided with a first active layer 1021; the vertical projection of the first active layer 1021 on the first surface 11 at least partially overlaps with the hollow foil area 101; wherein the hollow foil area 101 is provided with a tab 2; the first surface is further provided with a first other active material layer area 103 located outside the hollow foil area, and the first other active material layer area 103 is coated with a second active layer 1031;
- the second surface is also provided with a second other active material layer region 104 located outside the first active layer 1021 , and the second other active material layer region 104 is coated with a second active layer 1031 ;
- the electrode sheet includes a current collector 1, a first active layer 1021, and a second active layer 1031.
- the current collector 1 is divided into an active layer area and an empty foil area 101 according to whether an active layer is set.
- the active layer is set in the active layer area, and the area without an active layer is the empty foil area 101.
- the active layer area is divided into a first active layer area 102, a first other active material layer area 103, and a second other active material layer area 104.
- the first active layer 1021 is set in the first active layer area 102
- the second active layer 1031 is set in the first other active material layer area 103 and the second other active material layer area 104.
- the first surface 11 has two edges which are parallel to the length direction of the current collector 1 and are arranged opposite to each other, and the vertical distance between the two edges is the width dimension of the current collector 1.
- the empty foil area 101 is connected to at least one edge, that is, an opening is formed.
- the extension portion 202 is connected to an external circuit, so that the electrode sheet can be electrically connected to the external circuit.
- the electrode sheet is a negative electrode sheet or a positive electrode sheet, which is determined according to the specific selection of the materials of the current collector 1 and each active layer.
- the electrode sheet is a positive electrode sheet
- the electrode sheet is a negative electrode sheet.
- the battery provided by the present application includes the above-mentioned electrode sheet.
- the battery includes at least two electrode sheets stacked on each other and having opposite polarities, and a diaphragm is arranged between each two adjacent electrode sheets, and the diaphragm is used to prevent the electrode sheets with opposite polarities from contacting each other and causing a short circuit in the battery.
- At least one of the electrode sheets is the above-mentioned electrode sheet.
- the electrode sheet and battery provided in the present application are provided with a pole ear 2 on the empty foil area 101, and a first active layer 1021 is provided on the first active area 102.
- the pole ear 2 is arranged opposite to the first active layer 1021, and the first other active material layer area 103 and the second other active material layer area 104 located outside the empty foil area 101 and the first active area 102 are provided with a second active layer 1031.
- the electrode sheet is applied to the battery, and the first active layer 1021 can absorb more electrolyte than the second active layer 1031. Since the pole ear 2 is arranged opposite to the first active layer 1021, it can ensure that there is enough conductive medium to transmit current, thereby improving the cycle performance and safety performance of the battery.
- step 2) coating the positive electrode active layer slurry prepared in step 1) on the first surface 11 and the second surface 12 of an aluminum foil (thickness of 10 ⁇ m), and drying to form an active layer; cleaning the active layer in the middle of the first surface 11 to expose a portion of the first surface 11 to obtain an empty foil area 101, wherein the size W1 of the empty foil area 101 in the length direction of the current collector 1 is 12 mm, and the size L of the empty foil area 101 in the width direction of the current collector 1 is 22 mm;
- Rolling is performed by a roller press.
- the compaction density of the active layer of the first active area 102 symmetrical to the empty foil area 101 is 3.3 g/cm 3
- the compaction density of the second active layer of the first other active material layer area 103 and the second other active material layer area 104 is 4.15 g/cm 3
- the thickness H1 of the first active layer 1021 of the first active area 102 is 60 ⁇ m
- the thickness of the second active layer 1031 is 44 ⁇ m
- the thickness H of the electrode sheet is 98 ⁇ m
- the porosity of the second active layer 1031 is 16.8%
- the first active layer 1031 is 16.8%.
- the porosity of the active layer 1021 is 22.1%
- step 2) coating the negative electrode active layer slurry prepared in step 1) on both surfaces of a copper foil (thickness of 6 ⁇ m) and drying to obtain a negative electrode sheet;
- the negative electrode sheet is rolled using a roller press, and then the negative electrode sheet is cut using a slitting machine, and finally the negative electrode ear is welded on the negative electrode sheet;
- the steps for preparing the negative electrode sheet and the lithium-ion battery of this embodiment are the same as those of Embodiment 1, except that the steps for preparing the positive electrode sheet are as follows:
- step 2) coating the positive electrode active layer slurry prepared in step 1) on the first surface 11 and the second surface 12 of the aluminum foil (thickness of 10 ⁇ m), drying, and forming an active layer; rolling, after rolling, the thickness H of the electrode sheet is 98 ⁇ m, and the thickness of the active layer is consistent, that is, the thickness H1 of the first active layer 1021 and the thickness of the second active layer 1031 are both 44 ⁇ m, and then cleaning the middle position of the active layer on one surface of the electrode sheet to obtain an empty foil area 101;
- the positive electrode sheet is replaced with the positive electrode sheet prepared in this embodiment.
- the positive electrode sheet is replaced with the positive electrode sheet prepared in this embodiment.
- the preparation process of the positive electrode sheet and the negative electrode sheet is basically the same as that of Example 2, except that the porosity of the first active layer 1021 is controlled to be 33.6% during the preparation of the positive electrode sheet, and other conditions remain unchanged to obtain the positive electrode sheet of this embodiment;
- the positive electrode sheet is replaced with the positive electrode sheet prepared in this embodiment.
- the positive electrode sheet is replaced with the positive electrode sheet prepared in this embodiment.
- the test method is as follows: the battery is subjected to a cycle test at 25°C using a 2.6C/1C charging condition; and the thickness change curve of the battery during the cycle is measured, as shown in Table 1 and Figure 6.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
1-集流体;11-第一表面;12-第二表面;
101-空箔区;
102-第一活性区;1021-第一活性层;
103-第一其他活性物质层区;104-第二其他活性物质层区;1031-第二活性层;
1003-第一其他活性区;1004-第二其他活性区;1005-第三其他活性区;1006-第四其他活性区;
2-极耳。
Claims (12)
- 一种电极片,其中,包括集流体、第一活性层、第二活性层和极耳,所述集流体包括相对设置的第一表面和第二表面;所述第一表面设有空箔区,所述第二表面设有第一活性层;所述第一活性层在第一表面上的垂直投影与所述空箔区至少部分重合;其中,所述空箔区设有极耳;所述第一表面还设有位于所述空箔区外的第一其他活性物质层区,所述第一其他活性物质层区涂覆有第二活性层;所述第二表面还设有位于所述第一活性层外的第二其他活性物质层区,所述第二其他活性物质层区涂覆有第二活性层;所述第一活性层的孔隙率大于所述第二活性层的孔隙率。
- 根据权利要求1所述的电极片,其中,所述第一活性层在第一表面上的垂直投影与所述空箔区完全重合。
- 根据权利要求1所述的电极片,其中,所述第一活性层的孔隙率为A,所述第二活性层的孔隙率为B,B:A=1:(1.1~10)。
- 根据权利要求1所述的电极片,其中,所述第一活性层的厚度大于第二活性层的厚度。
- 根据权利要求1所述的电极片,其中,所述第一活性层的压实密度小于第二活性层的压实密度。
- 根据权利要求1-5任一项所述的电极片,其中,在所述第一表面上,所述第一其他活性物质层区位于所述空箔区至少相对的两侧。
- 根据权利要求1-5任一项所述的电极片,其中,在所述第二表面上,所述第二其他活性物质层区位于所述第一活性层至少相对的两侧。
- 根据权利要求6或7所述的电极片,其中,所述电极片的厚度为H,所述第一活性层的厚度为H1,H:H1=1:(0.5~0.95)。
- 根据权利要求1-5任一项所述的电极片,其中,所述极耳沿第一方向延伸,包括位于所述空箔区内的连接部以及位于所述集流体外的延伸部。
- 根据权利要求9所述的电极片,其中,所述空箔区在第一方向上的尺寸为L,所述连接部在第一方向上的尺寸为L1,L=(1~2)L1。
- 根据权利要求10所述的电极片,其中,所述第一活性层在第二方向上的尺寸为W,所述连接部在第二方向上的尺寸为W1,W=(1~5)W1,其中所述第二方向与所述第一方向垂直。
- 一种电池,其中,包括权利要求1-11任一项所述的电极片。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP24738581.8A EP4604195A4 (en) | 2023-01-05 | 2024-01-05 | ELECTRODE SHEET AND BATTERY |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320018275.2U CN218957773U (zh) | 2023-01-05 | 2023-01-05 | 电极片及电池 |
| CN202320018275.2 | 2023-01-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024146650A1 true WO2024146650A1 (zh) | 2024-07-11 |
Family
ID=86109904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CN2024/070957 Ceased WO2024146650A1 (zh) | 2023-01-05 | 2024-01-05 | 电极片及电池 |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4604195A4 (zh) |
| CN (1) | CN218957773U (zh) |
| WO (1) | WO2024146650A1 (zh) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN218957773U (zh) * | 2023-01-05 | 2023-05-02 | 珠海冠宇电池股份有限公司 | 电极片及电池 |
| CN116914079B (zh) * | 2023-08-29 | 2025-07-08 | 珠海冠宇电池股份有限公司 | 一种电极片和电池 |
| CN117423799B (zh) * | 2023-12-14 | 2024-03-19 | 珠海冠宇电池股份有限公司 | 一种极片和电池 |
| CN117894916A (zh) * | 2024-01-18 | 2024-04-16 | 蜂巢能源科技股份有限公司 | 一种正极极片及其制备方法和锂离子电池 |
| CN222355150U (zh) * | 2024-04-24 | 2025-01-14 | 比亚迪股份有限公司 | 极片、电芯和电池 |
| CN119069634A (zh) * | 2024-09-27 | 2024-12-03 | 比亚迪股份有限公司 | 电池极片、电池及其制备方法和应用 |
| CN119208513B (zh) * | 2024-09-30 | 2025-09-26 | 珠海冠宇电池股份有限公司 | 一种正极片和电池 |
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2023
- 2023-01-05 CN CN202320018275.2U patent/CN218957773U/zh active Active
-
2024
- 2024-01-05 EP EP24738581.8A patent/EP4604195A4/en active Pending
- 2024-01-05 WO PCT/CN2024/070957 patent/WO2024146650A1/zh not_active Ceased
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