KR-20260067883-A - ELECTRODE AND RECHARGEABLE BATTERY INCLUDING THE SAME

Abstract

An electrode for a secondary battery according to one embodiment of the present invention comprises a substrate, an active material layer formed on the substrate, a hole formed in the active material layer, and a first groove and a second groove formed on each side of the hole, spaced apart from the hole.

Inventors

• 이호정
• 김연갑
• 홍대현
• 민중기
• 지형민

Assignees

• 삼성에스디아이 주식회사

Dates

Publication Date

20260513

Application Date

20241106

Claims (20)

1. write, An active material layer formed on the above-mentioned substrate, A hole formed in the active material layer, and a first groove and a second groove formed respectively on both sides of the hole, spaced apart from the hole. An electrode for a secondary battery comprising
2. In paragraph 1, An electrode for a secondary battery in which the sum of the length of the first groove and the length of the second groove is 10% to 80% with respect to the length in the first direction of the active material layer.
3. In paragraph 1, An electrode for a secondary battery in which the gap between the first groove and the second groove is 10% to 80% with respect to the length of the first direction of the active material layer.
4. In paragraph 1, The above holes have openings facing the surface of the active material layer, are formed in multiple numbers, and are arranged at regular intervals, forming an electrode for a secondary battery.
5. In Paragraph 4, The above hole is an electrode for a secondary battery having a shape in which the width narrows as it moves away from the surface of the active material layer.
6. In paragraph 1, The depths of the first groove and the second groove are constant for a secondary battery electrode.
7. In paragraph 6, The depths of the first groove and the second groove are shallower than the depth of the hole, for a secondary battery electrode.
8. In paragraph 1, The horizontal line that bisects the center of the hole and the width of the groove is an electrode for a secondary battery located on the same straight line.
9. In paragraph 1, The first groove and the second groove pass between the first groove and the second groove, and the electrode for a secondary battery is inclined at -50 to 50 degrees with respect to a virtual centerline that bisects the length of the first direction of the active material layer.
10. In paragraph 1, The above hole, the first groove and the second groove pass between the first groove and the second groove, and is an electrode for a secondary battery that is symmetric with respect to an imaginary centerline that bisects the length of the first direction of the active material layer.
11. In paragraph 1, The first groove and the second groove are electrodes for a secondary battery that include a curve.
12. In paragraph 1, The width of the first groove and the second groove is 10㎛ to 100㎛, and An electrode for a secondary battery, wherein the spacing between adjacent first grooves and the spacing between adjacent second grooves is 70㎛ to 300㎛.
13. In paragraph 1, An electrode for a secondary battery having a diameter of 10㎛ to 100㎛ for the above holes.
14. An electrode assembly comprising an anode, a cathode overlapping with the anode, and a separator located between the anode and the cathode, A case accommodating the above electrode assembly, The electrolyte injected into the above case, Cap assembly for sealing the above case Includes, A secondary battery comprising at least one of the anode and cathode, a substrate, a first groove and a second groove formed on the substrate and spaced apart from each other and formed in a direction in which the electrolyte is injected, and a hole located between the first groove and the second groove.
15. In Paragraph 14, A secondary battery in which the sum of the length of the first groove and the length of the second groove is 10% to 80% of the length of the active material layer in the direction in which the electrolyte is injected.
16. In Paragraph 14, A secondary battery in which the gap between the first groove and the second groove is 10% to 80% of the length of the active material layer in the direction in which the electrolyte is injected.
17. In Paragraph 14, A secondary battery in which the above holes are formed in multiple numbers and arranged at regular intervals.
18. In Paragraph 14, A secondary battery in which the first groove and the second groove pass between the first groove and the second groove, and are inclined at an angle of -50 to 50 degrees with respect to a virtual centerline that bisects the length of the active material layer in the direction in which the electrolyte is injected.
19. In Paragraph 14, A secondary battery in which the above hole, the first groove and the second groove are symmetric with respect to an imaginary centerline that bisects the length of the active material layer in the direction in which the electrolyte is injected, passing between the first groove and the second groove.
20. In Paragraph 14, The first groove and the second groove are a secondary battery including a curve.

Description

Electrode and rechargeable battery including the same The present invention relates to an electrode and a secondary battery including the same. With the technological development of portable devices, the demand for secondary batteries as an energy source is increasing. Unlike primary batteries, secondary batteries are batteries that undergo repeated charging and discharging. These secondary batteries can form a cylindrical or jellyroll-shaped electrode assembly by overlapping a positive electrode, a separator, and a negative electrode and then winding them, or form a stacked electrode assembly by separating them into sheets and then stacking them. For secondary batteries, the electrolyte is injected after the electrode assembly is inserted into the case. At this time, the amount of electrolyte impregnated may vary depending on the edges and center of the electrode assembly or the condition of the active material layer. As such, if the electrolyte is non-uniform, lithium (Li) precipitation occurs, leading to problems such as a shortened battery life and difficulty in rapid charging. The information described above disclosed in the background technology of this invention is intended only to enhance understanding of the background of the present invention and may therefore include information that does not constitute prior art. The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings. FIG. 1 is a plan view of an electrode included in a secondary battery according to one embodiment of the present invention. Figure 2 is a cross-sectional view taken along the line II-II' of Figure 1. FIGS. 3 to 6 are plan views of an electrode according to another embodiment of the present invention. FIG. 7 is a plan view of an electrode included in a secondary battery according to another embodiment of the present invention. FIG. 8 is a schematic perspective view of a secondary battery according to one embodiment of the present invention. Fig. 9 is a cross-sectional view of the secondary battery illustrated in Fig. 8. Figure 10 is a cross-sectional view of the secondary battery illustrated in Figure 8. Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor can appropriately define the concepts of terms to best describe their invention, they should be interpreted in a meaning and concept consistent with the technical spirit of the present invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely some of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention. It should be understood that various equivalents and modifications capable of replacing them may exist at the time of filing this application. Additionally, as used herein, “comprise, include” and/or “comprising, including” specify the presence of the mentioned features, numbers, steps, actions, parts, elements, and/or groups thereof, and do not exclude the presence or addition of one or more other features, numbers, actions, parts, elements, and/or groups. Additionally, to aid in understanding the invention, the attached drawings are not drawn to actual scale, and the dimensions of some components may be exaggerated. Furthermore, the same reference numerals may be assigned to identical components in different embodiments. Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless specifically stated otherwise, the first component may also be the second component. Throughout the specification, unless specifically stated otherwise, each component may be singular or plural. Spatial relative terms such as "beneath," "below," "lower," "above," and "upper" may be used herein for ease of explanation to describe the relationship between one element or feature and another element(s) or feature(s) as illustrated in the drawings. Spatially relative positions are to be understood as encompassing different orientations of the device in use or operation, in addition to the orientations depicted in the figures. For example, if the device in the drawing is inverted, an element described as "below" or "below" is understood as "above" or "upper" of another el