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KR-20260066317-A - ALL-SOLID-STATE BATTERY AND A METHOD FOR MANUFACTURING IT

KR20260066317AKR 20260066317 AKR20260066317 AKR 20260066317AKR-20260066317-A

Abstract

The present invention relates to an all-solid-state battery and a method for manufacturing the same, and more specifically, comprises: a positive electrode layer including a positive current collector and a positive active material layer on the positive current collector, wherein the positive active material layer includes a first positive active material layer on the positive current collector and a second positive active material layer on the first positive active material layer; a negative electrode layer; a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer; and a positive insulating film on one side of the first positive active material layer, wherein the thickness of the first positive active material layer may be less than or equal to the thickness of the second positive active material layer.

Inventors

  • 이민석
  • 황수민
  • 민명기
  • 류영균

Assignees

  • 삼성에스디아이 주식회사

Dates

Publication Date
20260512
Application Date
20241104

Claims (20)

  1. An anode layer comprising an anode current collector and an anode active material layer on the anode current collector, wherein the anode active material layer comprises a first anode active material layer on the anode current collector and a second anode active material layer on the first anode active material layer; cathode layer; A solid electrolyte layer disposed between the anode layer and the cathode layer; and The anode insulating film on one side of the first anode active material layer is included, A solid-state battery in which the thickness of the first positive active material layer is less than or equal to the thickness of the second positive active material layer.
  2. In paragraph 1, The above solid electrolyte layer includes a first solid electrolyte layer adjacent to the second positive electrode active material layer and a second solid electrolyte layer adjacent to the negative electrode layer, and The thickness of the first positive active material layer is smaller than the thickness of the first solid electrolyte layer in an all-solid-state battery.
  3. In paragraph 2, The thickness of the second positive active material layer is greater than the thickness of the first solid electrolyte layer in an all-solid-state battery.
  4. In paragraph 1, The thickness of the first positive active material layer is 30 μm to 120 μm, and An all-solid-state battery in which the thickness of the second positive active material layer is 50 μm to 150 μm.
  5. In paragraph 1, The above-mentioned first positive active material layer is an all-solid-state battery including a protrusion.
  6. In paragraph 1, A solid-state battery in which the maximum width of the first positive active material layer is greater than the maximum width of the second positive active material layer.
  7. In paragraph 1, The above-mentioned side of the first positive active material layer has a curved shape and is an all-solid-state battery.
  8. In paragraph 1, The above positive insulating film is an all-solid-state battery that extends from the positive current collector through one side of the first positive active material layer to a part of the side of the second positive active material layer.
  9. In paragraph 1, The above anode insulating film is: An adhesive layer in direct contact with one side of the first positive active material layer; and All-solid-state battery comprising an insulating layer on the adhesive layer above.
  10. In Paragraph 9, An all-solid-state battery in which the thickness of the adhesive layer is 20% to 60% of the thickness of the anode insulating film.
  11. In paragraph 1, The above solid electrolyte layer includes a first solid electrolyte layer adjacent to the second positive electrode active material layer and a second solid electrolyte layer adjacent to the negative electrode layer, and An all-solid-state battery further comprising an inert member disposed on the second solid electrolyte layer, surrounding the anode layer, the first solid electrolyte layer, and the anode insulating film.
  12. In Paragraph 11, An all-solid-state battery further comprising a fixed layer disposed between the inert member and the second solid electrolyte layer.
  13. 1st monocell; and Including a second monocell on the first monocell above, The second monocell is arranged vertically symmetrically with respect to the first monocell, and Each of the above first and second monocells is: The positive electrode layer comprises a positive electrode current collector, a first positive electrode active material layer on the positive electrode current collector, and a second positive electrode active material layer on the first positive electrode active material layer; cathode layer; A solid electrolyte layer disposed between the anode layer and the cathode layer, wherein the solid electrolyte layer comprises a first solid electrolyte layer adjacent to the second anode active material layer and a second solid electrolyte layer adjacent to the cathode layer; A positive insulating film on one side of the first positive active material layer; An inert member surrounding the anode layer, the first solid electrolyte layer, and the anode insulating film, and disposed on the second solid electrolyte layer; A fixed layer provided between the above-mentioned inert member and the above-mentioned second solid electrolyte layer; and It includes a tape layer on the above-mentioned inert member, The positive current collector of the first monocell and the positive current collector of the second monocell face each other in an all-solid-state battery.
  14. In Paragraph 13, The air gap surrounded by the anode insulating film, the inert member, the second solid electrolyte layer, the first solid electrolyte layer, and the second anode active material layer is further included. The above air gap is a void or seam in an all-solid-state battery.
  15. In Paragraph 13, The above tape layer comprises a first adhesive layer, a second adhesive layer, and an inorganic composite layer between the first and second adhesive layers, and The above first and second adhesive layers are all-solid-state batteries containing different binders.
  16. In Paragraph 13, The above anode insulating film comprises an adhesive layer on one side of the first anode active material layer and an insulating layer on the adhesive layer, and The above adhesive layer includes a binder, and The above insulating layer comprises an organic material, an inorganic material, a binder, or a combination thereof, in an all-solid-state battery.
  17. In Paragraph 13, The above fixed layer comprises pulp fibers, glass fibers, a binder, aluminum hydroxide (Al(OH) ₃ ), or a combination thereof, in an all-solid-state battery.
  18. In Paragraph 13, The above-mentioned first positive active material layer includes a protrusion, and The side of the above-mentioned protrusion is a curved shape of an all-solid-state battery.
  19. A method of forming an anode laminate by stacking an anode layer and a first solid electrolyte layer and then applying a first pressure; A cathode layer and a second solid electrolyte layer are laminated, and then a second pressure is applied to form a cathode laminate; Transferring an anode insulating film onto one side of the anode laminate; and The method includes bonding the first solid electrolyte layer and the second solid electrolyte layer to combine the anode laminate and the cathode laminate, wherein Forming the above anode laminate is: Coating a first positive active material layer on a first substrate; Coating the first solid electrolyte layer and the second positive active material layer sequentially on the second substrate; and It includes transferring the first positive active material layer and the second positive active material layer so that they face each other. The maximum width of the first positive active material layer is greater than the maximum width of the second positive active material layer, and A method for manufacturing an all-solid-state battery in which the thickness of the first positive active material layer is smaller than the thickness of the second positive active material layer.
  20. In Paragraph 19, A method for manufacturing an all-solid-state battery further comprising sequentially forming a fixed layer, an inert member on the fixed layer, and a tape layer on the inert member on the cathode laminate before combining the anode laminate and the cathode laminate.

Description

All-solid-state battery and a method for manufacturing it The present invention relates to an all-solid-state battery and a method for manufacturing the same. Recently, driven by industrial demands, the development of batteries with high energy density and safety is actively underway. For example, lithium-ion batteries are being commercialized not only in the fields of information and communication devices but also in the automotive sector. In the automotive sector, safety is considered particularly important because it is directly related to human life. Recently, all-solid-state batteries have been proposed in which the liquid electrolyte of lithium-ion batteries is replaced with a solid electrolyte. By not using flammable organic dispersion media, all-solid-state batteries can significantly reduce the likelihood of fire or explosion in the event of a short circuit. Therefore, such all-solid-state batteries can possess excellent safety. FIG. 1 is a cross-sectional view of an all-solid-state battery according to one embodiment of the present invention. FIG. 2 is a plan view of an all-solid-state battery according to one embodiment of the present invention. FIG. 3 is a cross-sectional view of an all-solid-state battery according to another embodiment of the present invention. FIG. 4 is a cross-sectional view of an all-solid-state battery according to another embodiment of the present invention. FIG. 5 is a cross-sectional view of an all-solid-state battery according to another embodiment of the present invention. FIG. 6 is a cross-sectional view of an all-solid-state battery according to another embodiment of the present invention. FIG. 7a is a plan view illustrating an all-solid-state battery including an anode layer and a solid electrolyte layer according to another embodiment of the present invention, and FIG. 7b is a cross-sectional view along line I-I' of FIG. 7a. Figure 8 is an enlarged view showing the M region of Figure 7b. FIG. 9 is a cross-sectional view of an all-solid-state battery according to another embodiment of the present invention. Figure 10 is an enlarged view showing the tape layer of Figure 9. FIGS. 11 and FIGS. 12 are cross-sectional views of an all-solid-state battery according to other embodiments of the present invention. FIGS. 13a to 13d, FIGS. 14a to 14c and FIG. 15 are conceptual diagrams for explaining a method for manufacturing an all-solid-state battery according to an embodiment of the present invention. FIG. 16 is a conceptual diagram illustrating a method for manufacturing an all-solid-state battery according to another embodiment of the present invention. In order to fully understand the structure and effects of the present invention, preferred embodiments of the present invention are described with reference to the attached drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various forms and various modifications can be made. The description of these embodiments is provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention. In this specification, when a component is described as being on another component, it means that it may be formed directly on the other component or that a third component may be interposed between them. Additionally, in the drawings, the thicknesses of the components are exaggerated for the effective description of the technical content. Throughout the specification, parts indicated by the same reference numeral represent the same components. The embodiments described herein will be described with reference to cross-sectional and/or plan views, which are exemplary illustrations of the invention. In the drawings, the thicknesses of films and regions are exaggerated for effective description of the technical content. Accordingly, the regions illustrated in the drawings are schematic in nature, and the shapes of the regions illustrated in the drawings are intended to illustrate specific forms of regions of the device and are not intended to limit the scope of the invention. Although terms such as first, second, third, etc., have been used to describe various components in the various embodiments of this specification, these components should not be limited by such terms. These terms are used merely to distinguish one component from another. The embodiments described and illustrated herein also include their complementary embodiments. Unless otherwise specified in this specification, the singular form may also include the plural. Additionally, unless otherwise specified, "A or B" may mean "comprising A, comprising B, or comprising A and B." As used herein, "comprises" and/or "comprising" do not exclude the presence or addition of one or more other components to the mentioned components. In this specification, "combination of these" may mean a mixture of components, a laminate, a composite, a