WO-2026095184-A1 - ALL-SOLID-STATE BATTERY AND METHOD FOR PRODUCING SAME

WO2026095184A1WO 2026095184 A1WO2026095184 A1WO 2026095184A1WO-2026095184-A1

Abstract

The present invention relates to an all-solid-state battery and a method for producing same and, more specifically, to an all-solid-state battery comprising: a positive electrode layer including a positive electrode current collector and a positive electrode active material layer; a negative electrode layer including a negative electrode current collector and a negative electrode coating layer; a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer; and a positive electrode insulating film on one side surface of the positive electrode active material layer, wherein the positive electrode current collector includes an active portion and a tab portion, the tab portion includes an edge region adjacent to the active portion and an uncoated region extending from the edge region, the positive electrode insulating film includes: an adhesive layer in direct contact with the one side surface of the positive electrode active material layer; and an insulating layer on the adhesive layer, and the positive electrode insulating film may extend from a positive electrode protrusion of the positive electrode active material layer to the uncoated region.

Inventors

LEE, MINSUK
KIM, JAEWON
CHOI, Seokryul
Min, Myoungki
RYU, Younggyoon

Assignees

삼성에스디아이 주식회사

Dates

Publication Date: 20260507
Application Date: 20241205
Priority Date: 20241030

Claims (20)

A positive layer comprising a positive current collector and a positive active material layer; A cathode layer comprising a cathode current collector and a cathode coating layer; A solid electrolyte layer disposed between the anode layer and the cathode layer; and The anode insulating film on one side of the anode active material layer, wherein The above-mentioned positive current collector includes an active portion and a tab portion, the tab portion includes an edge region adjacent to the active portion and a non-active region extending from the edge region, and the positive insulating film is: An adhesive layer in direct contact with one side of the positive active material layer; and It includes an insulating layer on the adhesive layer above, and The above positive insulating film is an all-solid-state battery extending from the positive protrusion of the positive active material layer onto the uninsulated region.
In paragraph 1, The above solid electrolyte layer is: A first solid electrolyte layer adjacent to the anode layer; and It includes a second solid electrolyte layer adjacent to the above-mentioned cathode layer, and An all-solid-state battery further comprising an inert member disposed on the second solid electrolyte layer, surrounding the side of the positive active material layer, the side of the first solid electrolyte layer, and the side of the positive insulating film.
In paragraph 2, The above inert member is: A first inert member on the side of the anode insulating film; and It includes a second inert member on the side of the positive active material layer and the side of the first solid electrolyte layer, A solid-state battery in which the width of the first inert member is smaller than the width of the second inert member.
In paragraph 2, An all-solid-state battery further comprising the anode insulating film, the inert member, the second solid electrolyte layer, and the first solid electrolyte layer interposed between them.
In paragraph 4, The above air gap is a void or a seam in an all-solid-state battery.
In paragraph 1, The above solid electrolyte layer is: A first solid electrolyte layer adjacent to the anode layer; and It includes a second solid electrolyte layer adjacent to the above-mentioned cathode layer, and The width of the positive active material layer is greater than or equal to the width of the first solid electrolyte layer in an all-solid-state battery.
In paragraph 6, One side of the above positive active material layer includes a curved surface, and A solid-state battery having a side of the anode insulating film having a curved surface corresponding to the one side.
In paragraph 2, An all-solid-state battery further comprising a fixed layer disposed between the inert member and the second solid electrolyte layer.
In paragraph 1, A solid-state battery in which the height of the anode insulating film is greater than or equal to the thickness of the anode active material layer.
In Paragraph 9, The above solid electrolyte layer is: A first solid electrolyte layer adjacent to the anode layer; and It includes a second solid electrolyte layer adjacent to the above-mentioned cathode layer, and A solid-state battery in which the height of the anode insulating film is smaller than the sum of the thickness of the anode active material layer and the thickness of the first solid electrolyte layer.
In paragraph 1, 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.
In paragraph 8, 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.
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 first and second monocells comprises an anode layer including an anode current collector and an anode active material layer, a cathode layer, a solid electrolyte layer disposed between the anode layer and the cathode layer, and an anode insulating film on one side of the anode layer. The above positive insulating film is disposed extending from one side of the positive active material layer onto the unprotected region of the positive current collector, and The above solid electrolyte layer includes a first solid electrolyte layer adjacent to the anode layer and a second solid electrolyte layer adjacent to the cathode layer, and A solid-state battery in which the positive layer of the first monocell and the positive layer of the second monocell face each other, and the positive insulating film of the first monocell and the positive insulating film of the second monocell face each other.
In Paragraph 13, Each of the above first and second monocells is: An inert member disposed on the second solid electrolyte layer, surrounding the side of the positive active material layer, the side of the first solid electrolyte layer, and the side of the positive insulating film; and The air gap surrounded by the anode insulating film, the inert member, the second solid electrolyte layer, and the first solid electrolyte layer is further included. The above air gap is a void or seam in an all-solid-state battery.
In Paragraph 14, Each of the first and second monocells further comprises a fixed layer disposed between the inert member and the second solid electrolyte layer, forming an all-solid-state battery.
In Paragraph 13, A solid-state battery in which the height of the anode insulating film is greater than the thickness of the anode active material layer and less than the sum of the thickness of the anode active material layer and the thickness of the first solid electrolyte layer.
In Paragraph 13, The above anode insulating film comprises an adhesive layer on one side of the 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.
In paragraph 15, The above fixed layer comprises pulp fibers, glass fibers, a binder, aluminum hydroxide (Al(OH) ₃ ), or a combination thereof, and All-solid-state battery having an adhesive strength of the fixed layer of 50 gf/25mm to 300 gf/25mm.
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 A method for manufacturing an all-solid-state battery, wherein transferring the anode insulating film comprises sequentially laminating an adhesive layer, an insulating layer, and an adhesive substrate layer on the anode laminate and removing the adhesive substrate layer.
In Paragraph 19, Forming the anode laminate comprises laminating a first functional layer on the first solid electrolyte layer before applying the first pressure, and Forming the above cathode laminate includes laminating a second functional layer on the second solid electrolyte layer before applying the second pressure, and A method for manufacturing an all-solid-state battery, further comprising removing the first functional layer and the second functional layer before combining the positive electrode laminate and the negative electrode laminate.

Description

All-solid-state battery and method for manufacturing the same The present invention relates to an all-solid-state battery. 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. Figures 8a and 8b are enlarged views 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 N region 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 copolymer, an alloy, a blend,