CN-122000282-A - Electrode and rechargeable lithium battery including the same

Abstract

The present disclosure relates to an electrode for a rechargeable lithium battery, which includes an electrode current collector and a plurality of active material layers, and a rechargeable lithium battery including the same. The multi-layered active material layer includes a first active material layer, a second active material layer, and a third active material layer stacked on the electrode current collector. The first active material layer includes a first active material and the third active material layer includes a second active material. The second active material layer includes a first region including a first active material and a second region including a second active material. The first regions and the second regions are alternately arranged along a first direction, the first regions extend parallel to each other in a second direction intersecting the first direction, and the second regions extend parallel to each other in the second direction.

Inventors

• Pu Zhengzhu
• NAN XUAN
• Lv Zhenwo
• Pu Jinshi
• LI MINGAO
• Ding Minrong

Assignees

• 三星SDI株式会社

Dates

Publication Date

20260508

Application Date

20251023

Priority Date

20241104

Claims (20)

1. 1. An electrode for a rechargeable lithium battery, the electrode comprising: Electrode current collector, and A plurality of active material layers on the electrode current collector, Wherein the multi-layered active material layer includes a first active material layer, a second active material layer, and a third active material layer stacked on the electrode current collector, The first active material layer includes a first active material, The third active material layer comprises a second active material, The second active material layer includes a first region including the first active material, and a second region including the second active material, The first regions and the second regions are alternately arranged along a first direction, The first regions extend parallel to each other in a second direction intersecting the first direction, The second regions extend parallel to each other in the second direction, The third active material layer has a porosity greater than that of the second active material layer, and The second active material layer has a porosity greater than a porosity of the first active material layer.
2. 2. An electrode according to claim 1, Wherein at least one of the first active material layer, the second active material layer, and the third active material layer further comprises a binder and a conductive material, and The amount of the conductive material in the second active material layer is 3 to 10 times greater than the amount of the conductive material in the first active material layer or the third active material layer.
3. 3. The electrode according to claim 2, wherein an amount of the conductive material in each of the first active material layer and the third active material layer is in a range of 0.001wt% to 0.5 wt%.
4. 4. The electrode according to claim 2, wherein the amount of the conductive material in the second active material layer is in a range of 1wt% to 5 wt%.
5. 5. The electrode of claim 2, wherein the conductive material comprises at least one of natural graphite, artificial graphite, carbon black, acetylene black, ketjen black, carbon fibers, carbon nanofibers, and carbon nanotubes.
6. 6. The electrode of claim 2, wherein the binder comprises at least one of a rubber-based binder, an acrylate-based binder, a polyvinylidene fluoride-based binder, a polyvinylpyrrolidone-based binder, a nitrile-based binder, an acetate-based binder, a polyvinyl alcohol-based binder, and a cellulose-based binder.
7. 7. An electrode according to claim 1, Wherein the average particle diameter D 50 of the first active material is smaller than the average particle diameter D 50 of the second active material, The first active material has an average particle diameter D 50 in the range of 2 μm to 30 μm, and The second active material has an average particle diameter D 50 in the range of 10 μm to 50 μm.
8. 8. The electrode according to claim 1, wherein the first active material and the second active material are each independently represented by the following formula 1: formula 1: Li x4 M 1 y M 2 z M 3 1-y-z O 2-a X a wherein, in the above formula 1, X4 is less than or equal to 0.5 1.8,0 a is less than or equal to 0.05, y is more than or equal to 0 and less than or equal to 1, z is more than or equal to 0 and less than or equal to 1, and y+z is more than or equal to 0 and less than or equal to 1, M 1 、M 2 and M 3 each independently comprise one or more of Ni, co, mn, al, B, ba, ca, ce, cr, fe, mo, nb, si, sr, mg, ti, V, W, zr, la and combinations thereof, and X includes one or more of F, S, P and Cl.
9. 9. The electrode of claim 1, wherein a volume ratio of the first region to the second region is in a range of 1:9 to 9:1.
10. 10. The electrode according to claim 1, wherein the second active material layer has a thickness in a range of 30% to 100% relative to a thickness of one of the first active material layer and the third active material layer.
11. 11. An electrode for a rechargeable lithium battery, the electrode comprising: an electrode current collector; a first active material layer on the electrode current collector, and A second active material layer on the first active material layer, Wherein the first active material layer comprises a first region comprising a first active material and a second region comprising a second active material, The first regions and the second regions are alternately arranged along a first direction, The first regions extend parallel to each other in a second direction intersecting the first direction, The second regions extend parallel to each other in the second direction, The second active material layer includes the second active material, and The second active material layer has a lower rolling density than the first active material layer.
12. 12. The electrode of claim 11, wherein the second active material layer has a porosity greater than a porosity of the first active material layer.
13. 13. An electrode according to claim 11, Wherein at least one of the first active material layer and the second active material layer further comprises a binder and a conductive material, The amount of the conductive material in the first active material layer is in a range of 3 to 10 times as large as the amount of the conductive material in the second active material layer.
14. 14. The electrode of claim 13, wherein the amount of the conductive material in the first active material layer is in the range of 1wt% to 5 wt%.
15. 15. An electrode according to claim 13, Wherein the conductive material comprises at least one of natural graphite, artificial graphite, carbon black, acetylene black, ketjen black, carbon fiber, carbon nanofiber and carbon nanotube, and The binder comprises at least one of rubber binders, acrylic binders, polyvinylidene fluoride binders, polyvinylpyrrolidone binders, nitrile binders, acetate binders, polyvinyl alcohol binders and cellulose binders.
16. 16. An electrode according to claim 11, Wherein the average particle diameter D 50 of the first active material is smaller than the average particle diameter D 50 of the second active material, The first active material has an average particle diameter D 50 in the range of 2 μm to 30 μm, and The second active material has an average particle diameter D 50 in the range of 10 μm to 50 μm.
17. 17. An electrode according to claim 11, Wherein each of the first active material and the second active material is independently represented by the following formula 1: formula 1: Li x4 M 1 y M 2 z M 3 1-y-z O 2-a X a wherein, in the above formula 1, X4 is less than or equal to 0.5 1.8,0 a is less than or equal to 0.05, y is more than or equal to 0 and less than or equal to 1, z is more than or equal to 0 and less than or equal to 1, and y+z is more than or equal to 0 and less than or equal to 1, M 1 、M 2 and M 3 each independently comprise one or more of Ni, co, mn, al, B, ba, ca, ce, cr, fe, mo, nb, si, sr, mg, ti, V, W, zr, la and combinations thereof, and X includes one or more of F, S, P and Cl.
18. 18. The electrode of claim 11, wherein a volume ratio of the first region to the second region is in a range of 1:9 to 9:1.
19. 19. The electrode according to claim 11, wherein the first active material layer has a thickness in a range of 30% to 100% relative to a thickness of the second active material layer.
20. 20. A rechargeable lithium battery, the rechargeable lithium battery comprising: A positive electrode; a negative electrode; A separator between the positive electrode and the negative electrode, and The electrolyte is used for preparing the electrolyte, Wherein at least one of the positive electrode and the negative electrode comprises an electrode according to any one of claims 1 to 19.

Description

Electrode and rechargeable lithium battery including the same The present application claims priority from korean patent application No. 10-2024-0154273, filed on 4/11/2024, the entire contents of which are incorporated herein by reference. Technical Field The present disclosure herein relates to an electrode and a rechargeable lithium battery including the same. Background As the presence of electronic devices using batteries, such as, for example, mobile phones, laptop computers, electric vehicles, etc., increases, the demand for rechargeable batteries having high energy density and high capacity is increasing. Therefore, it may be advantageous to improve the performance of rechargeable lithium batteries. The rechargeable lithium battery includes positive and negative electrodes including active materials capable of intercalating and deintercalating lithium ions, and an electrolyte, and generates electric energy through oxidation and reduction reactions while lithium ions are deintercalated from the positive electrode and intercalated into the negative electrode and deintercalated from the negative electrode and intercalated into the positive electrode. Disclosure of Invention Examples of the present disclosure describe electrodes having improved capacity and lifetime characteristics. Other embodiments of the present disclosure describe rechargeable lithium batteries including the electrode. An electrode for a rechargeable lithium battery according to an example concept of the present disclosure may include an electrode current collector and a plurality of active material layers on the electrode current collector, wherein the plurality of active material layers may include a first active material layer, a second active material layer, and a third active material layer stacked (e.g., sequentially stacked) on the electrode current collector, the first active material layer may include a first active material, and the third active material layer may include a second active material. The second active material layer may include first regions including a first active material and second regions including a second active material, the first regions and the second regions may be alternately arranged along a first direction, the first regions may extend parallel to each other in a second direction crossing the first direction, and the second regions may extend parallel to each other in the second direction. The third active material layer may have a porosity greater than that of the second active material layer, and the second active material layer may have a porosity greater than that of the first active material layer. An electrode for a rechargeable lithium battery according to another exemplary concept of the present disclosure may include an electrode current collector, a first active material layer on the electrode current collector, and a second active material layer on the first active material layer. The first active material layer may include a first region including a first active material and a second region including a second active material. The first regions and the second regions may be alternately arranged along the first direction, the first regions may extend parallel to each other in a second direction crossing the first direction, and the second regions may extend parallel to each other in the second direction. The second active material layer may include a second active material, and the second active material layer may have a lower rolling density than the first active material layer. A rechargeable lithium battery according to another example concept of the present disclosure may include a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and an electrolyte, wherein at least one of the positive electrode and the negative electrode may include the electrode discussed above. Drawings The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification. The accompanying drawings illustrate example embodiments of the present disclosure and, together with the description, explain the principles of the disclosure. In the drawings: Fig. 1 is a conceptual diagram illustrating a rechargeable lithium battery according to an example embodiment of the present disclosure; Fig. 2 to 5 are schematic views illustrating a rechargeable lithium battery according to an example embodiment, wherein fig. 2 may be a cylindrical battery, fig. 3 may be a prismatic battery, and fig. 4 and 5 may be pouch-type batteries; fig. 6 is a schematic diagram of an electrode for a rechargeable lithium battery according to an example embodiment of the present disclosure; fig. 7 is a cross-sectional view for describing an electrode for a rechargeable lithium battery according to an example embodiment of the present disclosure; Fig. 8 is an enlarged view for describing