CN-122000287-A - Electrode and rechargeable battery including the same

Abstract

An electrode for a rechargeable battery and a rechargeable battery including the same are provided. An electrode for a rechargeable battery according to an example embodiment includes a substrate, an active material layer formed on the substrate, a hole formed in the active material layer, and first and second grooves formed at both sides of the hole and spaced apart from the hole.

Inventors

• LI HAOTING
• Jin Ranjia
• Hong Daxuan
• Min Zhongji
• Chi Jiongmin

Assignees

• 三星SDI株式会社

Dates

Publication Date

20260508

Application Date

20251103

Priority Date

20241106

Claims (20)

1. 1. An electrode for a rechargeable battery, the electrode for a rechargeable battery comprising: A substrate; an active material layer formed on the substrate; A hole formed in the active material layer, and First and second grooves formed on both sides of the hole and spaced apart from the hole.
2. 2. The electrode for a rechargeable battery according to claim 1, wherein a sum of a length of the first groove and a length of the second groove is in a range of 10% to 80% of a length of the active material layer in the first direction.
3. 3. The electrode for a rechargeable battery according to claim 1, wherein a space between the first groove and the second groove is in a range of 10% to 80% of a length of the active material layer in the first direction.
4. 4. The electrode for a rechargeable battery according to claim 1, wherein the electrode comprises a plurality of holes having openings toward a surface of the active material layer, and the plurality of holes are arranged at regular intervals.
5. 5. The electrode for a rechargeable battery according to claim 4, wherein the hole has a shape that becomes narrower in width as the distance from the surface of the active material layer increases.
6. 6. The electrode for a rechargeable battery according to claim 1, wherein the depth of the first and second grooves is substantially constant.
7. 7. The electrode for a rechargeable battery according to claim 6, wherein the first and second grooves have a depth shallower than the hole.
8. 8. The electrode for a rechargeable battery according to claim 1, wherein a center of the hole and a horizontal line bisecting widths of the first groove and the second groove are located on the same line.
9. 9. The electrode for a rechargeable battery according to claim 1, wherein: the first and second grooves are inclined at an angle in the range of-50 degrees to 50 degrees with respect to a virtual center line that passes between the first and second grooves and bisects a length of the active material layer in a first direction.
10. 10. The electrode for a rechargeable battery according to claim 1, wherein: the aperture, the first groove, and the second groove are substantially symmetrical about an imaginary center line that passes between the first groove and the second groove and bisects a length of the active material layer in a first direction.
11. 11. The electrode for a rechargeable battery according to claim 1, wherein the first groove and the second groove comprise curves.
12. 12. The electrode for a rechargeable battery according to claim 1, wherein: The first groove and the second groove have a width in the range of 10 μm to 100 μm, and In the second direction, the interval between adjacent first grooves and the interval between adjacent second grooves are in the range of 70 μm to 300 μm.
13. 13. The electrode for a rechargeable battery according to claim 1, wherein the diameter of the hole is in the range of 10 μm to 100 μm.
14. 14. A rechargeable battery, the rechargeable battery comprising: an electrode assembly including a positive electrode, a negative electrode stacked with the positive electrode, and a separator between the positive electrode and the negative electrode; a case accommodating the electrode assembly; electrolyte injected into the case, and A cap assembly sealing the housing; Wherein at least one of the positive electrode and the negative electrode includes an active material layer having a substrate, first and second grooves formed on the substrate and spaced apart from each other in a direction along which the electrolyte is injected, and a hole between the first and second grooves.
15. 15. The rechargeable battery of claim 14, wherein: the sum of the length of the first groove and the length of the second groove is in the range of 10% to 80% of the length of the active material layer in the direction along which the electrolyte is injected.
16. 16. The rechargeable battery of claim 14, wherein: The interval between the first groove and the second groove is in the range of 10% to 80% of the length of the active material layer in the direction along which the electrolyte is injected.
17. 17. The rechargeable battery according to claim 14, wherein a plurality of holes are provided in the active material layer at regular intervals.
18. 18. The rechargeable battery of claim 14, wherein: The first and second grooves are inclined at an angle in the range of-50 degrees to 50 degrees with respect to a virtual center line that passes between the first and second grooves and bisects a length of the active material layer in the direction in which the electrolyte is injected.
19. 19. The rechargeable battery of claim 14, wherein: The aperture, the first groove, and the second groove are substantially symmetrical with respect to an imaginary center line that passes between the first groove and the second groove and bisects a length of the active material layer in the direction along which the electrolyte is injected.
20. 20. The rechargeable battery of claim 14, wherein the first and second grooves comprise curves.

Description

Electrode and rechargeable battery including the same Technical Field The present disclosure relates to an electrode and a rechargeable battery including the same. Background With the development of portable device technology, the demand for rechargeable batteries as an energy source is growing. Unlike primary batteries, rechargeable batteries can be repeatedly charged and discharged. The electrode assembly of the rechargeable battery may be manufactured by stacking a positive electrode, a separator, and a negative electrode and then winding the positive electrode, the separator, and the negative electrode to form a cylindrical or core-shaped electrode assembly, or dividing the positive electrode, the separator, and the negative electrode into sheets and then laminating the sheets to form a laminated electrode assembly. In the rechargeable battery, an electrode assembly is inserted into a case, and then an electrolyte is injected. The impregnation amount of the electrolyte may vary according to the states of the edges and the center of the electrode assembly or the active material layer. Non-uniform electrolytes can cause lithium (Li) precipitation, shortening battery life and making rapid charging challenging. Disclosure of Invention Examples of the present disclosure provide an electrode capable of reducing electrolyte non-uniformity at edges and centers of the electrode and a rechargeable battery including the same. An electrode for a rechargeable battery according to an example embodiment includes a substrate, an active material layer formed on the substrate, a hole formed in the active material layer, and first and second grooves formed at both sides of the hole and spaced apart from the hole. The sum of the length of the first groove and the length of the second groove may be in a range of about 10% to about 80% of the length of the active material layer in the first direction. The spacing between the first groove and the second groove may be in the range of about 10% to about 80% of the length of the active material layer in the first direction. The holes may have openings toward the surface of the active material layer, may be formed in plurality, and may be arranged at regular intervals. The hole may have a shape that narrows in width with increasing distance from the surface of the active material layer. The depth of the first groove and the second groove may be constant. The first and second grooves may have depths shallower than the depth of the hole. The center of the hole and a horizontal line bisecting the width of the groove may lie on a straight line. The first and second grooves may be inclined at an angle in the range of about-50 degrees to about 50 degrees with respect to an imaginary or virtual center line that passes between the first and second grooves and bisects the length of the active material layer in the first direction. The aperture, the first groove and the second groove may be symmetrical or substantially symmetrical about an imaginary or virtual center line passing between the first groove and the second groove and bisecting the length of the active material layer in the first direction. The first groove and the second groove may comprise curves. The first grooves and the second grooves may have a width in a range of about 10 μm to about 100 μm, and the interval between adjacent first grooves and the interval between adjacent second grooves may be in a range of about 70 μm to about 300 μm. The diameter of the pores may be in the range of about 10 μm to about 100 μm. A rechargeable battery according to another exemplary embodiment includes an electrode assembly including a positive electrode, a negative electrode stacked with the positive electrode, a separator between the positive electrode and the negative electrode, a case accommodating the electrode assembly, an electrolyte injected into the case, and a cap assembly sealing the case. At least one of the positive electrode and the negative electrode includes an active material layer having a substrate, first and second grooves formed on the substrate and spaced apart from each other in a direction along which an electrolyte is injected, and a hole between the first and second grooves. The sum of the length of the first groove and the length of the second groove may be in the range of about 10% to about 80% of the length of the active material layer in the direction along which the electrolyte is injected. The interval between the first groove and the second groove may be in the range of about 10% to about 80% of the length of the active material layer in the direction along which the electrolyte is injected. The holes may be formed in plural and may be provided at given intervals. The first and second grooves may be inclined at an angle ranging from about-50 degrees to about 50 degrees with respect to an imaginary or virtual center line that passes between the first and second grooves and bisects a length of the active mat