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KR-20260062536-A - ELECTRODE FOR SECONDARY BATTERY AND LITHIUM SECONDARY BATTERY INCLUDING THE SAME

KR20260062536AKR 20260062536 AKR20260062536 AKR 20260062536AKR-20260062536-A

Abstract

An electrode for a secondary battery according to the present disclosure comprises an electrode current collector and an electrode active material layer disposed on one surface of the electrode current collector, the electrode active material layer comprising an electrode active material and a graphene conductive material. The number of layers of the graphene conductive material defined by Formula 1 is 2 to 15.

Inventors

  • 고병호

Assignees

  • 에스케이온 주식회사

Dates

Publication Date
20260507
Application Date
20241029

Claims (11)

  1. Electrode current collector; and The electrode active material layer disposed on one surface of the above electrode current collector and comprising an electrode active material and a graphene conductive material, and An electrode for a secondary battery, wherein the number of layers of the graphene conductive material defined by the following Formula 1 is 2 to 15: [Equation 1] Number of layers = (L c / D) + 1 (In Equation 1, Lc is the grain size calculated from the X-ray diffraction (XRD) analysis results of the graphene conductive material, and D is the d interval calculated from the X-ray diffraction analysis results of the graphene conductive material).
  2. An electrode for a secondary battery according to claim 1, wherein the number of layers is 3 to 12.
  3. An electrode for a secondary battery according to claim 1, wherein D in Formula 1 is 2.5 Å to 3.5 Å.
  4. An electrode for a secondary battery according to claim 1, wherein Lc in Formula 1 is 7.5 Å to 50 Å.
  5. An electrode for a secondary battery according to claim 1, wherein the ratio of the maximum peak intensity of the D band to the maximum peak intensity of the G band calculated from the Raman spectroscopic analysis results of the graphene conductive material (I D / I G ) is greater than 0 and less than or equal to 1.
  6. An electrode for a secondary battery according to claim 1, wherein the 1 g/ cm³ powder resistance of the graphene conductive material is 0.005 Ω·cm or less.
  7. An electrode for a secondary battery according to claim 1, wherein the BET specific surface area of the graphene conductive material is 100 m² /g to 1000 m² /g.
  8. An electrode for a secondary battery according to claim 1, wherein the content of the graphene conductive material is 0.01 weight% to 1 weight% of the total weight of the electrode active material layer.
  9. In claim 1, the electrode active material comprises a lithium metal oxide, an electrode for a secondary battery.
  10. An electrode for a secondary battery according to claim 1, wherein the electrode active material comprises a graphite-based active material or a silicon-based active material.
  11. It includes an anode and a cathode opposite to the anode, A lithium secondary battery in which the anode or the cathode is an electrode for a secondary battery according to claim 1.

Description

Electrode for secondary battery and lithium secondary battery including the same The present disclosure provides an electrode for a secondary battery and a lithium secondary battery including the same. Rechargeable batteries are batteries capable of repeated charging and discharging, and with the advancement of the information and communication and display industries, they are widely applied as power sources for portable electronic communication devices such as camcorders, mobile phones, and laptop PCs. Furthermore, recently, battery packs containing rechargeable batteries are being developed and applied as power sources for eco-friendly vehicles, such as hybrid cars. Examples of lithium secondary batteries include lithium secondary batteries, nickel-cadmium batteries, and nickel-hydrogen batteries; among these, lithium secondary batteries are being actively developed and applied due to their high operating voltage and energy density per unit weight, as well as advantages in charging speed and weight reduction. For example, a lithium secondary battery may include an electrode assembly comprising a positive electrode, a negative electrode, and a separator, and an electrolyte impregnating the electrode assembly. The lithium secondary battery may further include an outer casing, for example, in the form of a pouch, that accommodates the electrode assembly and the electrolyte. It is desirable for lithium secondary batteries to have low internal resistance and high rate characteristics, thereby having improved rapid charge/discharge characteristics. Therefore, it is necessary to develop electrodes capable of realizing low-resistance and high-rate-characteristic lithium secondary batteries. Figures 1 and 2 are scanning electron microscope (SEM) images of the graphene conductive materials of Preparation Example 1 and Preparation Example 2, respectively. Figures 3 and 4 are transmission electron microscope (TEM) images of the graphene conductive materials of Preparation Example 1 and Preparation Example 2, respectively. FIGS. 5 to 9 are SEM images of the positive active material layers of Example 1, Comparative Example 1, Comparative Example 3, Comparative Example 6, and Comparative Example 7, respectively. The present disclosure provides an electrode for a secondary battery comprising a conductive material having improved electrical conductivity characteristics. In addition, the present disclosure provides a lithium secondary battery comprising said electrode for a secondary battery. The present disclosure will be described in detail below. However, this is merely illustrative and the present disclosure is not limited to the specific embodiments described illustratively. The electrode for a secondary battery according to the present disclosure may be a positive electrode or a negative electrode. An electrode for a secondary battery according to the present disclosure comprises an electrode current collector and an electrode active material layer disposed on one surface of the electrode current collector. The electrode active material layer may be disposed on one surface of the electrode current collector or on both surfaces. When the electrode for the secondary battery is a positive electrode, the electrode current collector may be a positive current collector. The positive current collector may include stainless steel, nickel, aluminum, titanium, or an alloy thereof. The positive current collector may include carbon, nickel, titanium, aluminum or stainless steel surface-treated with silver. The thickness of the positive current collector may be, for example, 10 μm to 50 μm, although not limited thereto. When the electrode for the secondary battery is a negative electrode, the electrode current collector may be a negative electrode current collector. Non-limiting examples of negative electrode current collectors include copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, and a polymer substrate coated with a conductive metal. The negative electrode current collector may be, for example, 10 μm to 50 μm, although it is not limited thereto. The electrode active material layer comprises an electrode active material. The electrode active material may be a positive electrode active material or a negative electrode active material. The above positive electrode active material may include a lithium metal oxide. The lithium metal oxide may further include at least one of cobalt (Co), manganese (Mn), and aluminum (Al). In some embodiments, the positive electrode active material or the lithium metal oxide may comprise a layered structure or a crystalline structure represented by the following chemical formula 1. [Chemical Formula 1] Li x Ni a M b O 2+z In Chemical Formula 1, 0.9≤x≤1.2, 0.6≤a≤0.99, 0.01≤b≤0.4, and -0.5≤z≤0.1 may be used. As described above, M may include Co, Mn, and/or Al. The chemical structure represented by Chemical Formula 1 represents the bonding relationships contain