Search

KR-20260062183-A - POSITIVE ELECTRODE LAYER FOR ALL SOLID STATE BATERRY, METHOD OF MANUFACTURING THE SAME AND ALL SOLID STATE BATERRY COMPRISING THE SAME

KR20260062183AKR 20260062183 AKR20260062183 AKR 20260062183AKR-20260062183-A

Abstract

The present invention provides a positive electrode layer for an all-solid-state battery comprising a positive electrode current collector, a first positive electrode active material layer disposed on one side of the positive electrode current collector, and a second positive electrode active material layer disposed on the other side of the positive electrode current collector, wherein the first positive electrode active material layer and the second positive electrode active material layer comprise positive electrode active material particles, and when a straight line perpendicular to the positive electrode current collector is drawn in the direction of the first positive electrode active material layer and the direction of the second positive electrode active material layer, respectively, the average number of positive electrode active material particles crossing each straight line is greater than 0 and less than 8, and the ten-point average roughness Rz of the surface roughness is greater than 0 and less than 25.2 or the maximum height Ry of the surface roughness is greater than 0 and less than 24.4 μm, and a method for manufacturing the same and an all-solid-state battery including the same.

Inventors

  • 왕지은
  • 박성철
  • 김종민

Assignees

  • 삼성전기주식회사

Dates

Publication Date
20260507
Application Date
20241025

Claims (16)

  1. It includes a positive current collector, a first positive active material layer disposed on one side of the positive current collector, and a second positive active material layer disposed on the other side of the positive current collector. The first positive active material layer and the second positive active material layer include positive active material particles, When straight lines perpendicular to the positive current collector are drawn in the direction of the first positive active material layer and the direction of the second positive active material layer, respectively, the average number of positive active material particles crossing each straight line is greater than 0 and less than or equal to 8. A positive electrode layer for an all-solid-state battery, wherein the ten-point average roughness Rz of the surface roughness obtained from the average value of the ten-point average roughness of the surface roughness of the first positive electrode active material layer and the ten-point average roughness of the surface roughness of the second positive electrode active material layer is greater than 0 and less than 25.2 μm.
  2. In paragraph 1, A positive electrode layer for an all-solid-state battery, wherein the maximum height of the surface roughness Ry of the positive electrode layer is greater than 0 and less than 24.4 μm, obtained as the average value of the maximum height of the surface roughness of the first positive electrode active material layer and the maximum height of the surface roughness of the second positive electrode active material layer.
  3. In paragraph 1, A positive electrode layer for an all-solid-state battery, wherein the particle size (D50) of the positive electrode active material particles is 0.01 μm to 10 μm.
  4. In paragraph 1, The above positive active material particles comprise two types of positive active material particles with different particle sizes (D50) for a positive layer for an all-solid-state battery.
  5. In paragraph 1, A positive electrode layer for an all-solid-state battery, wherein the thickness of the first positive electrode active material layer and the second positive electrode active material layer is 1 μm to 20 μm.
  6. In paragraph 1, The first positive active material layer and the second positive active material layer are positive layers for an all-solid-state battery that further comprise a solid electrolyte.
  7. It includes a positive current collector, a first positive active material layer disposed on one side of the positive current collector, and a second positive active material layer disposed on the other side of the positive current collector. The first positive active material layer and the second positive active material layer include positive active material particles, When straight lines perpendicular to the positive current collector are drawn in the direction of the first positive active material layer and the direction of the second positive active material layer, respectively, the average number of positive active material particles crossing each straight line is greater than 0 and less than or equal to 8. A positive electrode layer for an all-solid-state battery, wherein the maximum height of surface roughness Ry, obtained from the average value of the maximum height of surface roughness of the first positive electrode active material layer and the maximum height of surface roughness of the second positive electrode active material layer, is greater than 0 and less than 24.4 μm.
  8. In Paragraph 7, A positive electrode layer for an all-solid-state battery, wherein the particle size (D50) of the positive electrode active material particles is 0.01 μm to 10 μm.
  9. In Paragraph 7, The above positive active material particles comprise two types of positive active material particles with different particle sizes (D50) for a positive layer for an all-solid-state battery.
  10. In Paragraph 7, A positive electrode layer for an all-solid-state battery, wherein the thickness of the first positive electrode active material layer and the second positive electrode active material layer is 1 μm to 20 μm.
  11. In Paragraph 7, The first positive active material layer and the second positive active material layer are positive layers for an all-solid-state battery that further comprise a solid electrolyte.
  12. A step of forming a first positive active material layer by printing a first paste containing positive active material particles and a solid electrolyte onto a substrate; A step of forming an anode current collector on the first anode active material layer; A step of forming a second positive active material layer by printing a second paste containing positive active material particles and a solid electrolyte onto the above positive current collector; and The step of removing the above-mentioned material is included, When straight lines perpendicular to the positive current collector are drawn in the direction of the first positive active material layer and the direction of the second positive active material layer, respectively, the average number of positive active material particles crossing each straight line is greater than 0 and less than or equal to 8. A method for manufacturing a positive electrode layer for an all-solid-state battery, wherein the ten-point average roughness Rz of the surface roughness obtained from the average value of the ten-point average roughness of the surface roughness of the first positive electrode active material layer and the ten-point average roughness of the surface roughness of the second positive electrode active material layer is greater than 0 and less than 25.2 μm.
  13. In Paragraph 12, A method for manufacturing a positive electrode layer for an all-solid-state battery, wherein the positive electrode active material particles and the solid electrolyte are included in a weight ratio of 2:1 to 10:1.
  14. A step of forming a first positive active material layer by printing a first paste containing positive active material particles and a solid electrolyte onto a substrate; A step of forming an anode current collector on the first anode active material layer; A step of forming a second positive active material layer by printing a second paste containing positive active material particles and a solid electrolyte onto the above positive current collector; and The step of removing the above-mentioned material is included, When straight lines perpendicular to the positive current collector are drawn in the direction of the first positive active material layer and the direction of the second positive active material layer, respectively, the average number of positive active material particles crossing each straight line is greater than 0 and less than or equal to 8. A positive electrode layer for an all-solid-state battery, wherein the maximum height of surface roughness Ry, obtained from the average value of the maximum height of surface roughness of the first positive electrode active material layer and the maximum height of surface roughness of the second positive electrode active material layer, is greater than 0 and less than 24.4 μm.
  15. In Paragraph 14, A method for manufacturing a positive electrode layer for an all-solid-state battery, wherein the positive electrode active material particles and the solid electrolyte are included in a weight ratio of 2:1 to 10:1.
  16. An anode layer according to any one of claims 1 to 11; cathode layer; and All-solid-state battery comprising a solid electrolyte layer stacked between the anode layer and the cathode layer.

Description

Positive electrode layer for all solid-state battery, method of manufacturing the same, and all solid-state battery comprising the same The present disclosure relates to a positive electrode layer for an all-solid-state battery, a method for manufacturing the same, and an all-solid-state battery comprising the same. Recently, as portable electronic devices are required to be miniaturized and used for extended periods, there is a demand for high-capacity batteries, and with the widespread adoption of wearable electronic devices, there is a need to ensure battery safety. Therefore, the development of all-solid-state batteries using solid electrolytes instead of liquid electrolytes is actively underway. All-solid-state batteries do not use flammable organic solvents, which allows for the simplification of additional safety circuits. Therefore, they are expected to be a technology capable of manufacturing safe batteries with high capacity per unit volume. Oxide all-solid-state batteries using oxide electrolytes have an ionic conductivity of 10⁻⁴ S/cm to 10⁻⁶ S/cm, which is lower than that of sulfides at 10⁻² S/cm, and require a high-temperature sintering process, but they have superior stability compared to sulfide all-solid-state batteries using sulfide electrolytes that react with oxygen and moisture in the air. Meanwhile, active research is also being conducted on the development of stacked all-solid-state batteries capable of realizing high capacity per unit volume. Stacked oxide all-solid-state batteries are ultra-small batteries that can be mounted on a substrate like passive components and remain stable even when exposed to high temperatures during the reflow process required for this purpose. FIG. 1 is a perspective view showing an all-solid-state battery according to one embodiment. Figure 2 is a cross-sectional view of an all-solid-state battery cut along line II' of Figure 1. Figure 3 is an exploded perspective view illustrating the structure of the laminate in the all-solid-state battery of Figure 1. Figure 4 is a scanning electron microscope (SEM) image showing a method for measuring the average number of positive active material particles in a positive electrode layer according to one embodiment. Figure 5 is a scanning electron microscope (SEM) image of the anode layer according to Example 1. Figure 6 is a scanning electron microscope (SEM) image of the anode layer according to Example 2. Figure 7 is a scanning electron microscope (SEM) image of the anode layer according to Example 3. Figure 8 is a scanning electron microscope (SEM) image of the anode layer according to Example 4. Figure 9 is a scanning electron microscope (SEM) image of the anode layer according to Example 5. Figure 10 is a scanning electron microscope (SEM) image of the anode layer according to Comparative Example 1. Figure 11 is a scanning electron microscope (SEM) image of the anode layer according to Comparative Example 2. Figure 12 is a scanning electron microscope (SEM) image of the anode layer according to Comparative Example 3. Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. In order to clearly explain the invention in the drawings, parts unrelated to the explanation have been omitted, and the same reference numerals have been used for identical or similar components throughout the specification. Furthermore, in the attached drawings, some components may be exaggerated, omitted, or schematically depicted, and the size of each component does not entirely reflect its actual size. The attached drawings are intended only to facilitate understanding of the embodiments disclosed in this specification, and the technical concept disclosed in this specification is not limited by the attached drawings; it should be understood that all modifications, equivalents, and substitutions included within the concept and technical scope of the present invention are included. Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. Furthermore, when it is said that a part, such as a layer, membrane, region, or plate, is "on" or "on" another part, this includes not only the case where it is "directly above" the other part, but also the case where there is another part in between. Conversely, when it is said that a part is "directly above" another part, it means that there is no other part in between. Also, saying that a part is "on" or "on" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "on" or "on" in the direction opposite to gravity. Throughout the specification, terms such as “comprising” or “having” are intended to indicate the existence