All-solid-state battery

Abstract

An all-solid-state battery includes a laminate with a positive electrode layer, a solid electrolyte layer, and a negative electrode layer stacked along a first direction. A first external electrode is disposed outside the laminate and connected to the positive electrode layer, while a second external electrode is disposed outside the laminate and connected to the negative electrode layer. A through-hole is located in a central portion of the laminate along the first direction, and the outer circumference of the laminate includes a curved portion when viewed in the first direction.

Description

ALL-SOLID-STATE BATTERY

[0001] The present disclosure relates to an all-solid-state battery.

[0002] Since currently available lithium-ion batteries use an electrolyte containing a flammable organic solvent, there is a risk of overheating and fire in the event of a short circuit. Accordingly, an all-solid-state battery using a solid electrolyte instead of an electrolyte solution has been proposed.

[0003] Recently, wearable electronic devices have become widespread, and there is increasing demand for all-solid-state batteries that can be installed in wearable electronic devices of various shapes.

[0004] The present disclosure attempts to provide an all-solid-state battery mountable in a ring-shaped wearable electronic device.

[0005] However, the objective of the present disclosure is not limited to the aforementioned one, and may be extended in various ways within the spirit and scope of the present disclosure.

[0006] An all-solid-state battery may include a laminate comprising a positive electrode layer, a solid electrolyte layer and a negative electrode layer stacked along a first direction, a first external electrode disposed outside the laminate and connected to the positive electrode layer, and a second external electrode disposed outside the laminate and connected to the negative electrode layer, wherein a through-hole is disposed in a central portion of the laminate along the first direction, and wherein an outer circumference of the laminate may include a curved portion when viewed in the first direction.

[0007] When viewed in the first direction, the through-hole and the outer circumference of the laminate may both be circular. A center of the through-hole and a center of the outer circumference of the laminate may be disposed at the same location.

[0008] When viewed in the first direction, the through-hole may be circular, and a radius of the through-hole may be the same as a radius of curvature of the curved portion.

[0009] When viewed in the first direction, the through-hole may be circular, and a radius of the through-hole may be different from a radius of curvature of the curved portion.

[0010] When viewed in the first direction, the outer circumference of the laminate may further comprise a straight portion connected to the curved portion.

[0011] The straight portion may comprise a first straight portion and a second straight portion opposed to each other in a second direction crossing the first direction, and a third straight portion and a fourth straight portion opposed to each other in a third direction intersecting the second direction.

[0012] The first straight portion and the second straight portion may have the same length, while the third straight portion and the fourth straight portion may have the same length.

[0013] The first, second, third, and fourth straight portions may all have the same length.

[0014] The curved portion may include a first curved portion disposed between the first straight portion and the fourth straight portion, a second curved portion disposed between the fourth straight portion and the second straight portion, a third curved portion disposed between the second straight portion and the third straight portion, and a fourth curved portion disposed between the third straight portion and the first straight portion.

[0015] When viewed in the first direction, the through-hole may be circular, and a radius of the through-hole may be the same as a radius of curvature of the curved portion.

[0016] When viewed in the first direction, the through-hole may be circular, and a radius of the through-hole may be different from a radius of curvature of the curved portion.

[0017] An all-solid-state battery, according to an embodiment, can be mounted in a ring-shaped wearable electronic device.

[0018] FIG. 1 is a perspective view schematically illustrating an all-solid-state battery according to an embodiment.

[0019] FIG. 2 is a perspective view schematically illustrating the laminate of FIG. 1.

[0020] FIG. 3 is a top plan view schematically illustrating the laminate of FIG. 1.

[0021] FIG. 4 is a cross-sectional view taken along line I-I' of FIG. 1.

[0022] FIG. 5 is a partial cross-sectional view schematically illustrating a positive electrode layer of the all-solid-state battery of FIG. 1.

[0023] FIG. 6 is a partial cross-sectional view schematically illustrating a negative electrode layer of the all-solid-state battery of FIG. 1.

[0024] FIG. 7 is a cross-sectional view taken along line II-II' of FIG. 4.

[0025] FIG. 8 is a cross-sectional view taken along line III-III' of FIG. 4.

[0026] FIG. 9 is a cross-sectional view taken along line IV-IV' of FIG. 1.

[0027] FIG. 10 is a cross-sectional view taken along line V-V' of FIG. 1.

[0028] FIG. 11 is a perspective view schematically illustrating an all-solid-state battery according to another embodiment.

[0029] FIG. 12 is a top plan view schematically illustrating the laminate of FIG. 11.

[0030] FIG. 13 is a cross-sectional view taken along line VI-VI' of FIG. 11.

[0031] FIG. 14 is a cross-sectional view taken along line VII-VII' of FIG. 13.

[0032] FIG. 15 is a cross-sectional view taken along line VIII-VIII' of FIG. 13.

[0033] The present disclosure will be described in greater detail hereinafter with reference to the accompanying drawings, in which embodiments of the disclosure are shown. The drawings and description are to be regarded as illustrative in nature and not restrictive. Like reference numerals designate corresponding elements throughout the specification. In addition, some components are exaggerated, omitted, or briefly illustrated in the added drawings, and sizes of the respective constituent elements do not reflect the actual sizes.

[0034] The accompanying drawings are provided only in order to allow embodiments disclosed in the present specification to be easily understood and are not to be interpreted as limiting the spirit disclosed in the present specification, and it is to be understood that the present disclosure includes all modifications, equivalents, and substitutions without departing from the scope and spirit of the present disclosure.

[0035] Terms including ordinal numbers such as first, second, and the like will be used only to describe various constituent elements, and are not to be interpreted as limiting these constituent elements. These terms are used solely to differentiate one constituent element from another.

[0036] It will be understood that when an element such as a layer, film, region, area, or substrate is referred to as being "on" or "above" another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. Furthermore, in the specification, the terms "on" or "above" means disposed on or below the object portion, and does not necessarily mean disposed on the upper side of the object portion based on a gravitational direction.

[0037] Throughout the specification, it should be understood that the term "include", "comprise", "have", or "configure" indicates that a feature, a number, a step, an operation, a constituent element, a part, or a combination thereof described in the specification is present, but does not exclude a possibility of presence or addition of one or more other features, numbers, steps, operations, constituent elements, parts, or combinations, in advance. Unless explicitly stated otherwise , the word "comprise" and variations such as "comprises" or "comprising" will be understood to imply the inclusion of stated elements but not the exclusion of any other elements.

[0038] Furthermore, throughout the specification, the phrase "in a plan view" or "on a plane" means viewing a target portion from the top, and the phrase "in a cross-sectional view" or "on a cross-section" means viewing a cross-section formed by vertically cutting a target portion from the side.

[0039] Furthermore, throughout the specification, "connected" does not solely mean when two or more elements are directly connected, but also when two or more elements are indirectly connected through other elements, and when they are physically connected or electrically connected, and further, it may be referred to by different names depending on a position or function, and may also be referred to as a case in which respective parts that are substantially integrated are linked to each other.

[0040] FIG. 1 is a perspective view schematically illustrating an all-solid-state battery according to an embodiment, FIG. 2 is a perspective view schematically illustrating the laminate of FIG. 1, FIG. 3 is a top plan view schematically illustrating the laminate of FIG. 1, and FIG. 4 is a cross-sectional view taken along line I-I' of FIG. 1. In addition, FIG. 5 is a partial cross-sectional view schematically showing a positive electrode layer of the all-solid-state battery of FIG. 1, and FIG. 6 is a partial cross-sectional view schematically illustrating a negative electrode layer of the all-solid-state battery of FIG. 1. In addition, FIG. 7 is a cross-sectional view taken along line II-II' of FIG. 4, and FIG. 8 is a cross-sectional view taken along line III-III' of FIG. 4. In addition, FIG. 9 is a cross-sectional view taken along line IV-IV' of FIG. 1, and FIG. 10 is a cross-sectional view taken along line V-V' of FIG. 1.

[0041] Referring to FIG. 1, an all-solid-state battery 1000 according to the present embodiment may include a laminate 100, a first external electrode 200, and a second external electrode 300.

[0042] First, as for directions defined for describing the present embodiment, L-axis, W-axis, and T-axis shown in the drawings indicate axes indicating a length direction, a width direction, and a thickness direction of the all-solid-state battery 1000, respectively.

[0043] The thickness direction (T-axis direction) may be a direction perpendicular to a wide surface (major surface) of sheet-like elements. For example, the thickness direction (T-axis direction) may correspond to the stacking direction of the components in the laminate 100.

[0044] The length direction (L-axis direction) is parallel to the wide surfaces (main surfaces) of the sheet-like components and may intersect (or be orthogonal to) the thickness direction (T-axis direction). For example, the length direction (L-axis direction) may be a direction in which the first external electrode 200 and the second external electrode 300 face each other.

[0045] The width direction (W-axis direction) is a direction parallel to the wide surface (main surface) of the sheet-like components, and may be a direction that simultaneously intersects (or crosses) the thickness direction (T-axis direction) and the length direction (L-axis direction).

[0046] The laminate 100 may have a substantially hexahedral shape, but the present embodiment is not limited thereto. Due to shrinkage during sintering, the laminate 100 may not have a complete hexahedral shape, but may have a substantially hexahedral shape. For example, the laminate 100 has a substantially rectangular hexahedral shape, but corner or vertex portions may have a round shape.

[0047] In the present embodiment, for convenience of description, surfaces opposing each other in the length direction (L-axis direction) of the laminate 100 may be defined as a first surface S1 and a second surface S2, surfaces opposing each other in the width direction (W-axis direction) of the laminate 100 and connecting the first surface S1 and the second surface S2 may be defined as a third surface S3 and a fourth surface S4, and surfaces opposing each other in the thickness direction (T-axis direction) of the laminate 100 and connecting the first surface S1 and the second surface S2 may be defined as a fifth surface S5 and a sixth surface S6.

[0048] Therefore, the first direction, defined as the direction in which the first surface S1 and the second surface S2 oppose each other, may be the length direction (L-axis direction). The second and third directions, which are perpendicular to the first direction and to each other, may correspond to the thickness direction (T-axis direction) and the width direction (W-axis direction), respectively, or vice versa.

[0049] A length of the laminate 100 may mean, based on an optical microscope or scanning electron microscope (SEM) photograph of a cross-section in the length direction (L-axis direction)-the thickness direction (T-axis direction) at a center of the width direction (W-axis direction) of the laminate 100, a maximum value of lengths of a plurality of line segments that connect two outermost boundary lines facing each other in the length direction (L-axis direction) of the laminate 100 shown in the above cross-sectional photograph and are parallel to the length direction (L-axis direction). Meanwhile, the length of the laminate 100 may mean a minimum value of lengths of a plurality of line segments that connect two outermost boundary lines facing each other in the length direction (L-axis direction) of the laminate 100 shown in the above cross-sectional photograph and are parallel to the length direction (L-axis direction). Additionally, the length of the laminate 100 may mean an arithmetic average value of lengths of at least two of a plurality of line segments that connect two outermost boundary lines facing each other in the length direction (L-axis direction) of the laminate 100 shown in the above cross-sectional photograph and are parallel to the length direction (L-axis direction).

[0050] A thickness of the laminate 100 may mean, based on an optical microscope or scanning electron microscope (microscope SEM) photograph of a cross-section in the length direction (L-axis direction)-the thickness direction (T-axis direction) at a center of the width direction (W-axis direction) of the laminate 100, a maximum value of lengths of a plurality of line segments that connect two outermost boundary lines facing each other in the thickness direction (T-axis direction) of the laminate 100 shown in the above cross-sectional photograph and are parallel to the thickness direction (T-axis direction). Alternatively, the thickness of the laminate 100 may refer to a minimum value of lengths of a plurality of line segments that connect two outermost boundary lines facing each other in the thickness direction (T-axis direction) of the laminate 100 shown in the above cross-sectional photograph and are parallel to the thickness direction (T-axis direction). Additionally, the thickness of the laminate 100 may mean an arithmetic average value of lengths of at least two of a plurality of line segments that connect two outermost boundary lines facing each other in the thickness direction (T-axis direction) of the laminate 100 shown in the above cross-sectional photograph and are parallel to the thickness direction (T-axis direction).

[0051] A width of the laminate 100 may mean, based on an optical microscope or scanning electron microscope (microscope SEM) photograph of a cross-section in the length direction (L-axis direction)-the width direction (W-axis direction) at a center of the thickness direction (T-axis direction) of the laminate 100, a maximum value of lengths of a plurality of line segments that connect two outermost boundary lines facing each other in the width direction (W-axis direction) of the laminate 100 shown in the above cross-sectional photograph and are parallel to the width direction (W-axis direction). Alternatively, the width of the laminate 100 may refer to a minimum value of lengths of a plurality of line segments that connect two outermost boundary lines facing each other in the width direction (W-axis direction) of the laminate 100 shown in the above cross-sectional photograph and are parallel to the width direction (W-axis direction). Additionally, the width of the laminate 100 may mean an arithmetic average value of lengths of at least two of a plurality of line segments that connect two outermost boundary lines facing each other in the width direction (W-axis direction) of the laminate 100 shown in the above cross-sectional photograph and are parallel to the width direction (W-axis direction).

[0052] Referring to FIGs. 1 to 4, the laminate 100 may include a through-hole 400.

[0053] For example, when viewed in the thickness direction (T-axis direction), the through-hole 400 may be disposed in the central portion of the laminate 100. However, the location of the through-hole 400 is not limited thereto, and the through-hole 400 may be positioned at any location inside but spaced apart from an outer circumference of the laminate 100.

[0054] The through-hole 400 may have a shape that is open toward the fifth surface S5 and the sixth surface S6 of the laminate 100, respectively.

[0055] For example, the through-hole 400 may have a cylindrical shape. That is, a cross-section of the through-hole 400 crossing the thickness direction (T-axis direction) may be a circular shape. However, the present embodiment is not limited thereto, and cross-section of the through-hole 400 may have various shapes, such as an elliptical shape and a polygonal shape.

[0056] Since the laminate 100 includes the through-hole 400, the all-solid-state battery 1000 according to the present embodiment can be mounted on a ring-shaped or donut-shaped wearable electronic device with minimal clearance.

[0057] Referring to FIG. 3, when viewed along thickness direction (T-axis direction), the outer circumference of the laminate 100 may include a straight portion 500 and a curved portion 600.

[0058] The straight portion 500 may comprise a first straight portion 510, a second straight portion 520, a third straight portion 530, and a fourth straight portion 540.

[0059] The first straight portion 510 and the second straight portion 520 oppose each other in the length direction (L-axis direction) of the laminate 100. For example, both the first straight portion 510 and the second straight portion 520 may be parallel to the width direction (W-axis direction) of the laminate 100.

[0060] The third straight portion 530 and the fourth straight portion 540 are opposed to each other in the width direction (W-axis direction) of the laminate 100. For example, the third straight portion 530 and the fourth straight portion 540 may run parallel to the length direction (L-axis direction) of the laminate 100.

[0061] The first straight portion 510 and the second straight portion 520 may have the same length, and the third straight portion 530 and the fourth straight portion 540 may have the same length. In this case, when viewed in the thickness direction (T-axis direction), the outer circumference of the laminate 100 may have a substantially rectangular shape.

[0062] Alternatively, the first straight portion 510, the second straight portion 520, the third straight portion 530, and the fourth straight portion 540 may all have the same length. In this case, when viewed in the thickness direction (T-axis direction), the outer circumference of the laminate 100 may have a substantially square shape.

[0063] Alternatively, the first straight portion 510, the second straight portion 520, the third straight portion 530, and the fourth straight portion 540 may all have different lengths.

[0064] The curved portion 600 may comprise a first curved portion 610, a second curved portion 620, a third curved portion 630, and a fourth curved portion 640.

[0065] The first curved portion 610 may be positioned between the first straight portion 510 and the fourth straight portion 540. For example, the first straight portion 510 and the fourth straight portion 540 may be connected by the first curved portion 610.

[0066] The second curved portion 620 may be disposed between the fourth straight portion 540 and the second straight portion 520. For example, the fourth straight portion 540 and the second straight portion 520 may be connected by the second curved portion 620.

[0067] The third curved portion 630 may be disposed between the second straight portion 520 and the third straight portion 530. For example, the second straight portion 520 and the third straight portion 530 may be connected by the third curved portion 630.

[0068] The fourth curved portion 640 may be disposed between the third straight portion 530 and the first straight portion 510. For example, the third straight portion 530 and the first straight portion 510 may be connected by the fourth curved portion 640.

[0069] As such, the outer circumference of the laminate 100 exhibit a shape where each of the straight portions 510, 520, 530, and 540 and each of the curved portions 610, 620, 630, and 640 are alternately disposed. However, the number of the straight portions and the number of the straight portions of the present embodiment may not be limited to what was described above, and may be three, or five or more, respectively.

[0070] The first curved portion 610, the second curved portion 620, the third curved portion 630, and the fourth curved portion 640 may each have the same radius of curvature.

[0071] For example, if the first curved portion 610, the second curved portion 620, the third curved portion 630, and the fourth curved portion 640 all have the same radius of curvature, and a cross-sectional shape of the through-hole 400 is circular, a radius of the through-hole 400 may be the same as a radius of curvature of the curved portion 600.

[0072] As another example, when the first curved portion 610, the second curved portion 620, the third curved portion 630, and the fourth curved portion 640 all have the same radius of curvature, and the cross-section shape of the through-hole 400 is circular, the radius of the through-hole 400 may be different from the radius of curvature of the curved portion 600. For example, the radius of the through-hole 400 may be ten times the radius of curvature of the curved portion 600. As another example, the radius of the through-hole 400 may be five times the radius of curvature of the curved portion 600. However, the present embodiment is not limited thereto.

[0073] Alternatively, the first curved portion 610, the second curved portion 620, the third curved portion 630, and the fourth curved portion 640 may each have a different radius of curvature.

[0074] As described above, the laminate 100 of the all-solid-state battery 1000 according to the present embodiment includes not only the through-hole 400 but also the curved portion 600 on its outer circumference, and thus has a shape corresponding to the shape of a ring-shaped wearable electronic device. Accordingly, the all-solid-state battery 1000 according to the present embodiment can be mounted on a ring-shaped wearable electronic device with minimal clearance.

[0075] Referring to FIG. 2 and FIG. 4, the laminate 100 may include solid electrolyte layers 110, positive electrode layers 130, negative electrode layers 150, an upper protective layer 160, a lower protective layer 170, and margin portion 180.

[0076] The solid electrolyte layer 110, the positive electrode layer 130, and the negative electrode layer 150 may each be plural. The positive electrode layer 130 and the negative electrode layer 150 may be alternately stacked in the thickness direction (T-axis direction) with the solid electrolyte layer 110 interposed therebetween. Such a laminated structure may repeat within the laminate 100, and the electrode layer closest to the fifth surface S5 of the laminate 100 may be the positive electrode layer 130 or the negative electrode layer 150, and the electrode layer closest to the sixth surface S6 may be the negative electrode layer 150 or the positive electrode layer 130.

[0077] The positive electrode layer 130 may be disposed on one surface of the solid electrolyte layer 110, and the negative electrode layer 150 may be disposed on the opposite surface of the solid electrolyte layer 110.

[0078] The solid electrolyte layer 110 includes a solid electrolyte. The solid electrolyte may serve as a passage for lithium (Li) ions.

[0079] The solid electrolyte in the solid electrolyte layer 110 may include a glass-ceramic electrolyte including lithium halide (LiX, where X is a halogen element such as F, Br, Cl, I, or the like). The glass-ceramic (or crystallization glass) refers to that a crystallographic mixture of amorphous and crystalline materials from which peaks and halos are observed in X-ray diffraction, electron beam diffraction, etc. Thus, the glass-ceramic-based electrolyte is an electrolyte that has undergone partial crystallization through sintering and in which amorphous and crystalline materials are mixed.

[0080] The glass-ceramic-based electrolyte may include a mixture of an amorphous material and two or more types of crystalline materials. In addition, the crystalline material included in the glass-ceramic-based electrolyte may include a lithium compound crystalline phase containing lithium.

[0081] When the glass-ceramic-based electrolyte is part of the solid electrolyte layer 110, sufficient densification is achieved after sintering, whereby it is possible to realize high ionic conductivity.

[0082] As an example, the glass-ceramic electrolyte may include lithium (Li) oxide, boron (B) oxide, silicon (Si) oxide, aluminum (Al) oxide, gallium (Ga) oxide, phosphorus (P) oxide, germanium (Ge) oxide, magnesium (Mg) oxide and lithium chloride (LiCl). Specifically, the glass-ceramic electrolyte may include Li2O-B2O3-SiO2-P2O5-GeO2-LiCl.

[0083] As another example, the solid electrolyte in the solid electrolyte layer 110 may contain a lithium-borosilicate-based electrolyte (hereinafter, referred to as LBSO-based electrolyte). The LBSO-based electrolyte is a glass-state electrolyte, and glass refers to a crystallographically amorphous material, from which halos are observed in the X-ray diffraction or electron beam diffraction.

[0084] When the LBSO-based electrolyte is part of the solid electrolyte layer 110, it is possible to keep the amorphous state during sintering while lowering the sintering temperature.　 Thus, there is an advantage that it is possible to realize high ionic conductivity, and reactivity with the electrode is not high. The LBSO-based electrolyte may include lithium (Li), boron (B), silicon (Si), aluminum (Al), phosphorus (P), germanium (Ge), and sulfur (S).

[0085] Alternatively, the solid electrolyte included in the solid electrolyte layer 110 may be one or more types selected from the group consisting of a Garnet-type, a Na super ionic conductor (NASICON)-type, a lithium super ionic conductor (LISICON)-type, a Perovskite-type, and a lithium phosphorus oxynitride (LiPON)-type.

[0086] The Garnet-type solid electrolyte may refer to lithium lanthanum zirconium oxide (LLZO) represented by LiaLabZrcO12such as Li7La3Zr2O12, and the NASICON-type solid electrolyte may include lithium-aluminum-titanium-phosphate (LATP) of Li1+xAlxTi2-x(PO4)3(wherein 0<x<1) produced by introducing Ti to Li1+xAlxM2-x(PO4)3(LAMP) (wherein 0<x<2, M is Zr, Ti, or Ge)-type compound, lithium-aluminum-germanium-phosphate (LAGP) represented by Li1+xAlxGe2-x(PO4)3(wherein 0<x<1), such as Li1.3Al0.3Ge1.7(PO4)3containing an excessive amount of lithium, and / or lithium-zirconium-phosphate (LZP) of LiZr2(PO4)3.

[0087] In addition, the LISICON-type solid electrolyte may include solid solution oxide represented by xLi3AO4-(1-x)Li4BO4(wherein A is P, As, V, etc., and B is Si, Ge, Ti, etc.), such as Li4Zn(GeO4)4, Li10GeP2O12(LGPO), Li3.5Si0.5P0.5O4, and Li10.42Si(Ge)1.5P1.5Cl0.08O11.92, etc., and solid solution sulfide represented by Li4-xM1-yM'yS4(wherein M is Si or Ge and M' is P, Al, Zn, or Ga), such as Li2S-P2S5, Li2S-SiS2, Li2S-SiS2-P2S5, or Li2S-GeS2.

[0088] Furthermore, the Perovskite-type solid electrolyte may include lithium lanthanum titanate (LLTO) represented by Li3xLa2 / 3-x□1 / 3-2xTiO3(wherein 0<x<0.16, and □ is vacancy), such as Li1 / 8La5 / 8TiO3, and the LiPON-type solid electrolyte may include nitride such as lithium phosphorous oxynitride of Li2.8PO3.3N0.46.

[0089] The positive electrode layer 130 may be exposed outside of the laminate 100 from the first surface S1, and may be connected to the first external electrode 200.

[0090] Referring to FIG. 4 and FIG. 5, the positive electrode layer 130 may include a positive electrode current collector 133, a first positive electrode active material layer 135, and a second positive electrode active material layer 136.

[0091] For example, the positive electrode current collector 133 may be made of a plate-shape member or a thin member. Alternatively, the positive electrode current collector 133 may be a porous body having a reticulate shape, a mesh shape, or the like.

[0092] The positive electrode current collector 133 may include a first surface 133a and a second surface 133b. The first surface 133a and the second surface 133b oppose each other in the thickness direction (T-axis direction).

[0093] The positive electrode current collector 133 may include, but is not limited to, a porous metal plate made of stainless steel, nickel (Ni), copper (Cu), tin (Sn), aluminum (Al), or an alloy thereof.

[0094] In addition, the positive electrode current collector 133 may be coated with an oxidation-resistant metal or an oxidation-resistant alloy film to prevent oxidation.

[0095] The positive electrode current collector 133 may include a carbon-based plate-shaped, thin, or linear member. The positive electrode current collector 133 may include a conductive carbon material. The conductive carbon material may include graphite, conductive fiber such as carbon nanotube (CNT) or vapor grown carbon fiber (VGCF), or conductive carbon such as carbon black.

[0096] Meanwhile, the positive electrode current collector may also include one or more types of solid electrolyte.

[0097] The first positive electrode active material layer 135 and the second positive electrode active material layer 136 may include positive electrode active materials and may be disposed on a surface of the positive electrode current collector 133. The first positive electrode active material layer 135 and the second positive electrode active material layer 136 may be formed by printing a positive electrode active material on one or both surfaces of the positive electrode current collector 133, but the method for forming the positive electrode active material layer is limited thereto.

[0098] The positive active material included in the first positive active material layer 135 and the second positive active material layer 136 may comprise a material containing lithium (Li) ions. The positive electrode active material may reversibly intercalate and deintercalate lithium ions. In other words, the positive electrode active material may contain lithium ions and serve to provide the lithium ions to the negative electrode when the all-solid-state battery is charging. The positive electrode active material may influence the capacity and output of the all-solid-state battery.

[0099] For example, the positive active material may include at least one selected from the group consisting of compounds represented by the following formula: LiaAl-bMbD2(where, 0.90≤a≤1.8, 0≤b≤0.5); LiaEl-bMbO2-cDc(where, 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); LiE2-bMbO4-cDc(where, 0≤b≤0.5, 0≤c≤0.05); LiaNi1-b-cCobMcDα(where, 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05, 0<α≤2); LiaNi1-b-cCobMcO2-αXα(where, 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05, 0<α<2); LiaNi1-b-cCobMcO2-αX2(where, 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05,0<α<2); LiaNi1-b-cMnbMcDα(where, 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05, 0<α≤2); LiaNi1-b-cMnbMcO2-αXα(where,0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05, 0<α<2); LiaNi1-b-cMnbMcO2-αX2(where, 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05, 0<α<2); LiaNibEcGdO2(where, 0.90≤a≤1.8, 0≤b≤0.9, 0≤c≤0.5, 0.001≤d≤0.1); LiaNibCocMndGeO2(where,0.90≤a≤1.8, 0≤b≤0.9, 0≤c≤0.5, 0≤d≤0.5, 0.001≤e≤0.1); LiaNiGbO2(where, 0.90≤a≤1.8, 0.001≤b≤0.1); LiaCoGbO2(where, 0.90≤a≤1.8, 0.001≤b≤0.1); LiaMnGbO2 (where, 0.90≤a≤1.8, 0.001≤b≤0.1); LiaMn2GbO4(where, 0.90≤a≤1.8, 0.001≤b≤0.1); QO2; QS2; LiQS2; V2O5; LiV2O2; LiRO2; LiNiVO4; Li(3-f)J2(PO4)3(0≤f≤2); Li(3-f)Fe2(PO4)3(where, 0≤f≤2); and LiFePO4, in which formula, A may be Ni, Co, or Mn; M may be Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, Nb, Ti or a rare-earth element; D may be O, F, S, or P; E may be Co or Mn; X may be F, S, or P; G may be Al, Cr, Mn, Fe, Mg, La, Ce, Sr, or V; Q may be Ti, Mo or Mn; R may be Cr, V, Fe, Sc, or Y; and J may be V, Cr, Mn, Co, Ni, or Cu.

[0100] The positive active material may also include LiCoO2, LiMnxO2x(where, x is 1 or 2), LiNi1-xMnxO2x(where, 0<x<1), LiNi1-x-yCoxMnyO2(where, 0≤x≤0.5, 0≤y≤0.5), LiFePO4, TiS2, FeS2, TiS3, or FeS3, but is not limited thereto.

[0101] The positive active material may optionally include a conductive material and a binder. However, because an organic substance such as a binder decomposes during sintering process, the organic material may not remain on the positive electrode active material layer of the obtained positive electrode current collector.

[0102] The conductive material is not particularly limited as long as it has conductivity without causing chemical changes in the all-solid-state battery 1000. For example, graphite such as natural graphite and artificial graphite; carbon-based materials such as carbon black, acetylene black, Ketjenblack®, channel black, furnace black, lamp black, and thermal black; conductive fibers such as carbon fibers, metal fibers, etc.; carbon fluoride; metal components such as lithium (Li), tin (Sn), aluminum (Al), nickel (Ni), copper (Cu), etc., oxides thereof, nitrides thereof, or fluorides thereof; conductive whiskers such as zinc oxide and potassium titanate; conductive metal oxides such as titanium oxide; conductive materials such as polyphenylene derivatives, etc., may be used.

[0103] The binder may be used to improve the bonding strength of the active material, the conductive material, or the like. The binder may include, but not limited to, at least one selected from the group consisting of polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, polytetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butadiene rubber (SBR), fluorine rubber, various copolymers, etc.

[0104] Meanwhile, the positive electrode layer 130 may further contain a solid electrolyte component. The solid electrolyte component may include one or more of the above-described components and may serve as an ionic conduction channel in the positive electrode layer. Therefore, it is possible to reduce interface resistance.

[0105] Referring to FIG. 7, the positive electrode layer 130 may include a first opening 137.

[0106] The first opening 137 may be disposed in a central portion of the positive electrode layer 130, and may be spaced apart from the through-hole 400 of the laminate 100. However, the location of the first opening 137 is not limited thereto, and the location of the first opening 137 may vary depending on the location of the through-hole 400.

[0107] A cross-sectional shape of the first opening 137 may be similar to that of the through-hole 400.For example, the cross-sectional shape of the first opening 137 may be circular, elliptical, or polygonal.

[0108] Referring to FIG. 4 and FIG. 7, an inner margin portion 189 may be disposed between the first opening 137 and the through-hole 400. The inner margin portion 189 may prevent the positive electrode layer 130 from being exposed to the outside (i.e., the through-hole 400). The inner margin portion 189 may be formed of the same material as a lengthwise margin portion 180L and a widthwise margin portion 180W, which will be described later.

[0109] The negative electrode layer 150 may be exposed outside of the laminate 100 from the second surface S2, and may be connected to the second external electrode 300.

[0110] Referring to FIG. 4 and FIG. 6, the negative electrode layer 150 may include a negative electrode current collector 153, a first negative electrode active material layer 155, and a second negative electrode active material layer 156.

[0111] The negative electrode current collector 153 may be formed of, for example, a plate-shaped member or a thin member. Alternatively, the negative electrode current collector 153 may include a porous body having a reticulate shape, a mesh shape, or the like.

[0112] The negative electrode current collector 153 may include a first surface 153a and a second surface 153b. The first surface 153a and the second surface 153b oppose each other in the thickness direction (T-axis direction).

[0113] For example, the negative electrode current collector 153 may include, but not limited to, a porous metal plate made of stainless steel, nickel (Ni), copper (Cu), tin (Sn), aluminum (Al), or an alloy thereof.

[0114] Additionally, the negative electrode current collector 153 may be coated with an oxidation-resistant metal or an oxidation-resistant alloy film to prevent oxidation.

[0115] The negative electrode current collector 153, like the positive electrode current collector 133, may include a conductive carbon-based material and one or more types of solid electrolytes. The negative electrode current collector 153 may be identical to the negative electrode active material layers 155 and 156.

[0116] The first negative electrode active material layer 155 and the second negative electrode active material layer 156 may include negative electrode active materials and be disposed on a surface of the negative electrode current collector 153. The first negative electrode active material layer 155 and the second negative electrode active material layer 156 may be formed by printing a negative electrode active material on one or both surfaces of the negative electrode current collector 153, but the method for forming a negative electrode active material layer is not limited thereto.

[0117] The negative electrode active material included in the first negative electrode active material layer 155 and the second negative electrode active material layer 156 may store the lithium ions that have moved from the positive electrode and release the lithium ions when the all-solid-state battery is discharged, thereby generating electrical energy. A carbon-based material, silicon, a silicon oxide, a silicon-based alloy, a silicon-carbon-based material composite, tin, a tin-based alloy, a tin-carbon composite, a metal oxide, or a combination thereof may be used as the negative electrode active material. The negative electrode active material may contain a lithium metal and / or a lithium metal alloy.

[0118] The lithium metal alloy may contain lithium, and a metal / metalloid capable of making an alloy with lithium. For example, the metal / metalloid capable of forming an alloy with lithium may include Si, Sn, Al, Ge, Pb, Bi, Sb, and Si-AM alloy (wherein AM is an alkali metal, an alkaline earth metal, an element in group 13 to 16, a transition metal, a rare-earth element, or a combination thereof, and does not include Si), Sn-AM alloys (wherein AM is an alkali metal, an alkaline earth metal, an element in group 13 to 16, a transition metal, a transition metal oxide such as lithium titanium oxide (Li4Ti5O12), a rare-earth element, or combinations thereof, and does not include Sn), MnOx(wherein 0<x≤2), and the like.

[0119] The element AM may include Mg, Ca, Sr, Ba, Ra, Sc, Y, Ti, Zr, Hf, Rf, V, Nb, Ta, Db, Cr, Mo, W, Sg, Tc, Re, Bh, Fe, Pb, Ru, Os, Hs, Rh, Ir, Pd, Pt, Cu, Ag, Au, Zn, Cd, B, Al, Ga, Sn, In, Tl, Ge, P, As, Sb, Bi, S, Se, Te, Po, or combinations thereof.

[0120] Additionally, the oxide of the metal / metalloid capable of forming an alloy with lithium may include lithium titanium oxide, vanadium oxide, lithium vanadium oxide, SnO2, SiOx(wherein 0<x<2), or the like. For example, the negative electrode active material may include one or more elements selected from the group consisting of the elements in group 13 to 16 of the periodic table of elements. For example, the negative electrode active material may contain one or more elements selected from the group consisting of Si, Ge, and Sn.

[0121] The carbon-based material may include crystalline carbon, amorphous carbon, or a mixture thereof. The crystalline carbon may be graphite such as natural graphite or artificial graphite that is in a shapeless, disc-shaped, flake-shaped, globular, or fibrous form. In addition, the amorphous carbon may include, but not limited to, soft carbon (low-temperature calcined carbon), hard carbon, mesophase pitch carbide, calcined cokes, graphene, carbon black, fullerene soot, carbon nanotube, carbon fiber, etc.

[0122] The silicon may include at least one selected from the group consisting of Si, SiOx(wherein 0<x<2, for example, 0.5 to 1.5), Sn, SnO2, or silicon-containing metal alloy, and mixtures thereof. For example, the silicon-containing metal alloy may include silicon, and one or more of Al, Sn, Ag, Fe, Bi, Mg, Zn, In, Ge, Pb, or Ti.

[0123] The negative active material may optionally include a conductive material and a binder.

[0124] The conductive material is not particularly limited as long as it provides conductivity without causing chemical changes in the all-solid-state battery 1000. For example, graphite such as natural graphite and artificial graphite; carbon-based materials such as carbon black, acetylene black, Ketjenblack®, channel black, furnace black, lamp black, and thermal black; conductive fibers such as carbon fibers, metal fibers, etc.; carbon fluoride; metal components such as lithium (Li), tin (Sn), aluminum (Al), nickel (Ni), copper (Cu), etc., oxides thereof, nitrides thereof, or fluorides thereof; conductive whiskers such as zinc oxide and potassium titanate; conductive metal oxides such as titanium oxide; conductive materials such as polyphenylene derivatives, etc., may be used.

[0125] The binder may be used to improve the bonding strength of the active material, the conductive material, or the like. The binder may include, but not limited to, at least one selected from the group consisting of polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, polytetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butadiene rubber (SBR), fluorine rubber, various copolymers, etc.

[0126] Meanwhile, the negative electrode layer 150 may further contain a solid electrolyte component. The solid electrolyte component may contain one or more of the above-described components and may serve as an ionic conduction channel in the negative electrode layer. Thus, interface resistance can be reduced.

[0127] Referring to FIG. 8, the negative electrode layer 150 may include a second opening 157.

[0128] The second opening 157 may be disposed in a central portion of the negative electrode layer 150, and may be spaced apart from the through-hole 400 of the laminate 100. However, the location of the second opening 157 is not limited thereto, and the location of the second opening 157 may vary depending on the location of the through-hole 400.

[0129] A cross-sectional shape of the second opening 157 may be similar to the cross-sectional shape of the through-hole 400. For example, the cross-sectional shape of the second opening 157 may be circular, elliptical, or polygonal.

[0130] Referring to FIG. 4 and FIG. 8, the inner margin portion 189 may be disposed between the second opening 157 and the through-hole 400. The inner margin portion 189 may prevent the negative electrode layer 150 from being exposed to the outside (i.e., the through-hole 400). The inner margin portion 189 may be formed of the same material as the lengthwise margin portion 180L and the widthwise margin portion 180W, which will be described later.

[0131] Referring to FIG. 4, FIG. 9 and FIG. 10, the upper protective layer 160 and the lower protective layer 170 may be outermost layers disposed on the fifth surface S5 and the sixth surface S6 of the laminate 100, respectively. That is, the upper protective layer 160 may be the outermost layer on the fifth surface S5 of the laminate 100, and the lower protective layer 170 may be the outermost layer toward the sixth surface S6 of the laminate 100. The upper protective layer 160 and the lower protective layer 170 may improve moisture resistance by preventing moisture penetration, and protecting against physical and chemical impacts.

[0132] The upper protective layer 160 and the lower protective layer 170 may be insulation layers made of an insulating material, that is, a material that does not have electrical conductivity (ionic conductivity).

[0133] The upper protective layer 160 and the lower protective layer 170 may include a ceramic material, for example, alumina (Al2O3), aluminum nitride (AlN), beryllium oxide (BeO), boron nitride (BN), silicon (Si), silicon carbide (SiC), silica (SiO2), silicon nitride (Si3N4), gallium arsenide (GaAs), gallium nitride (GaN), barium titanate (BaTiO3), zirconium dioxide (ZrO2), mixtures thereof, oxides and / or nitrides of such materials, or any other suitable ceramic materials, but is not limited thereto. Additionally, the upper protective layer 160 and the lower protective layer 170 may selectively include the above-described solid electrolytes, and may include one or more types of solid electrolytes, but are not limited thereto.

[0134] Referring to FIG. 4, FIG. 7, FIG. 8, FIG. 9, and FIG. 10, the margin portion 180 may include the lengthwise margin portion 180L, the widthwise margin portion 180W and the inner margin portion 189.

[0135] Referring to FIG. 4, FIG. 7 and FIG. 8, the lengthwise margin portion 180L may include a first margin portion 181 and a second margin portion 183. The first margin portion 181 may be disposed between the positive electrode layer 130 and the second external electrode 300, and the first margin portion 181 may comprise a portion of the second surface S2 of the laminate 100. The second margin portion 183 may be disposed between the negative electrode layer 150 and the first external electrode 200, and the second margin portion 183 may comprise a portion of the first surface S1 of the laminate 100.

[0136] Referring to FIG. 7, FIG. 8, FIG. 9 and FIG. 10, the widthwise margin portion 180W may include a third margin portion 185 and a fourth margin portion 187.

[0137] The third margin portion 185 may be in contact with one end of the positive electrode layer 130 in the width direction (W-axis direction), and the fourth margin portion 187 may be in contact with the other end of the positive electrode layer 130 in the width direction (W-axis direction). In addition, the third margin portion 185 may be in contact with one end of the negative electrode layer 150 in the width direction (W-axis direction), and the fourth margin portion 187 may be in contact with the other end of the negative electrode layer 150 in the width direction (W-axis direction). That is, the third margin portion 185 and the fourth margin portion 187 may be disposed outside of the positive electrode layer 130 and the negative electrode layer 150 in the width direction (W-axis direction), respectively.

[0138] The third margin portion 185 may comprise a portion of the third surface S3 of the laminate 100, and the fourth margin portion 187 may comprise a portion of the fourth surface S4.

[0139] The lengthwise margin portion 180L and the widthwise margin portion 180W may be disposed outside the positive electrode layer 130 or the negative electrode layer 150, on the solid electrolyte layer 110. Referring to FIG. 7, when the positive electrode layer 130 is disposed on the solid electrolyte layer 110, the first margin portion 181, the third margin portion 185 and the fourth margin portion 187 may be disposed on the outsides of the positive electrode layer 130. Referring to FIG. 8, when the negative electrode layer 150 is disposed on the solid electrolyte layer 110, the second margin portion 183, the third margin portion 185 and the fourth margin portion 187 may be disposed on the outsides of the negative electrode layer 150.

[0140] The lengthwise margin portion 180L and the widthwise margin portion 180W may be disposed to compensate for a level difference between the solid electrolyte layer 110 and the positive electrode layer 130 and a level difference between the solid electrolyte layer 110 and the negative electrode layer 150. For example, the lengthwise margin portion 180L and the widthwise margin portion 180W may be disposed on the same surface as the positive electrode layer 130 and the negative electrode layer 150. The lengthwise margin portion 180L and the widthwise margin portion 180W may compensate for a level difference between the solid electrolyte layer 110 and the positive electrode layer 130 or a level difference between the solid electrolyte layer 110 and the negative electrode layer 150. This increases the density between the solid electrolyte layer 110 and the electrode layers, which may prevent interlayer delamination or warping caused by sintering during a process of manufacturing the all-solid-state battery.

[0141] Meanwhile, the inner margin portion 189 may be disposed on an inner side of the first opening 137 of the positive electrode layer 130 and an inner side of the second opening 157 of the negative electrode layer 150.

[0142] Referring to FIG. 4, the inner margin portion 189 may be disposed between the lower protective layer 170 and the upper protective layer 160 to separate the positive electrode layer 130, the negative electrode layer 150 and the solid electrolyte layer 110 from the through-hole 400. That is, the solid electrolyte layer 110 does not extend to the through-hole 400. However, the present embodiment is not limited thereto, and the solid electrolyte layer 110 may be disposed to extend to the through-hole 400. In this case, a structure where the solid electrolyte layer 110 and the inner margin portion 189 are alternately stacked may contact the through-hole 400.

[0143] Meanwhile, the margin portion 180 may include a material resistant to moisture and with low lithium (Li) ion conductivity. In this case, the margin portion 180 may protect the active material layers 135, 136, 155, and 156 from moisture infiltration or lithium (Li) ion leakage. For example, the margin portion 180 may include an insulating material or electrolyte material, and may include a material with an ionic conductivity of 1.0x10-10S / cm or less.

[0144] The margin portion 180 may include an insulating material, i.e., a material that is not electrically (ionically) conductive.

[0145] The margin portion 180 may include, but not limited to, at least one selected from the group consisting of ceramic materials, such as alumina (Al2O3), aluminum nitride (AlN), beryllium oxide (BeO), boron nitride (BN), silicon (Si), silicon carbide (SiC), silica (SiO2), silicon nitride (Si3N4), gallium arsenide (GaAs), gallium nitride (GaN), barium titanate (BaTiO3), zirconium dioxide (ZrO2), mixtures thereof, oxides thereof and / or nitrides thereof, or any other suitable ceramic materials.

[0146] Additionally, the margin portion 180 may optionally include the above-described solid electrolyte, and may include one or more types of solid electrolytes, but is not limited thereto.

[0147] In addition, the margin portion 180 may optionally include a solid electrolyte that is the same as or different from the solid electrolyte included in the above-described solid electrolyte layer, and may include one or more types of solid electrolytes, but is not limited thereto.

[0148] For example, when a material having ionic conductivity (or electrical conductivity) similar to the ionic conductivity (or electrical conductivity) of the solid electrolyte is present in the margin portion, the material may be a material that is identical to or different from the solid electrolyte in other regions. In another example, a material having ionic conductivity (or electrical conductivity) similar to the ionic conductivity (or electrical conductivity) of the solid electrolyte and an insulating material may coexist in the margin portion.

[0149] The first external electrode 200 and the second external electrode 300 may be disposed outside the laminate 100.

[0150] The first external electrode 200 is connected to the positive electrode layer 130 and the solid electrolyte layer 110 on the first surface S1 of the laminate 100. For example, the first external electrode 200 may cover the first surface S1 of the laminate 100 and may extend onto the third surface S3, the fourth surface S4, the fifth surface S5, and the sixth surface S6 of the laminate 100, to partially cover the respective surfaces.

[0151] Meanwhile, in another embodiment, the first external electrode 200 may extend onto either the fifth surface S5 and the sixth surface S6 of the laminate 100, to partially cover the corresponding surface.

[0152] The first external electrode 200 may be formed by baking a conductive paste. For example, the conductive paste may include glass and a metal such as silver (Ag) or copper (Cu).

[0153] The second external electrode 300 may be connected to the negative electrode layer 150 and the solid electrolyte layer 110 on the second surface S2 of the laminate 100. For example, the second external electrode 300 may cover the second surface S2 of the laminate 100, and the second external electrode 300 may extend onto the third surface S3, the fourth surface S4, the fifth surface S5 and the sixth surface S6 of the laminate 100, to partially cover the respective surfaces.

[0154] Meanwhile, in another embodiment, the second external electrode 300 may extend onto one of the fifth surface S5 and the sixth surface S6 of the laminate 100, to partially cover the corresponding surface.

[0155] The second external electrode 300 may be formed by baking a conductive paste. For example, the conductive paste may include glass and a metal such as silver (Ag) or copper (Cu).

[0156] For example, the first surface S1 and the second surface S2 of the laminate 100 may be dipped into the conductive paste and then blotted to form the first external electrode 200 and the second external electrode 300. As another example, a conductive paste may be applied to the first surface S1 and the second surface S2 of the laminate 100, to form the first external electrode 200 and the second external electrode 300. As still another example, a dry film obtained by drying a conductive paste may be transferred to the laminate 100 and then baked, to form the first external electrode 200 and the second external electrode 300, but the method for forming the first external electrode 200 and the second external electrode 300 is not limited to the above-described method. For example, the metal included in the conductive paste may include at least one of copper (Cu), nickel (Ni), tin (Sn), palladium (Pd), platinum (Pt), gold (Au), silver (Ag), tungsten (W), titanium (Ti), lead (Pb) and an alloy thereof, but is not limited thereto.

[0157] FIG. 11 is a perspective view schematically showing the all-solid-state battery according to another embodiment, FIG. 12 is a top plan view schematically showing the laminate of FIG. 11, and FIG. 13 is a cross-sectional view taken along line VI-VI' of FIG. 11. FIG. 14 is a cross-sectional view taken along line VII-VII' of FIG. 13, and FIG. 15 is a cross-sectional view taken along line VIII-VIII' of FIG. 13.

[0158] Referring to FIG. 11, an all-solid-state battery 2000 may include a laminate 1100, a first external electrode 1200, and a second external electrode 1300.

[0159] Referring to FIG. 11 and FIG. 12, the laminate 1100 may include a through-hole 1400. When viewed in the thickness direction (T-axis direction), the through-hole 400 is circular, and an outer circumference of the laminate 1100 may be circular. That is, the laminate 1100 may have a ring or donut shape.

[0160] For example, the through-hole 400 and the outer circumference of the laminate 1100 may be concentric. That is, the center of the through-hole 400 may coincide with the center of the outer circumference of the laminate 1100.

[0161] As another example, the center of the through-hole 400 may not coincide with the center of the outer circumference of the laminate 1100. That is, the center of the through-hole 400 may be spaced apart from the center of the outer circumference of the laminate 1100.

[0162] Meanwhile, the through-hole 400 and the outer circumference of the laminate 1100 may be elliptical, respectively.

[0163] Referring to FIG. 13, the laminate 1100 may include a solid electrolyte layer 1110, a positive electrode layer 1130, a negative electrode layer 1150, and the margin portions 1180, 1181, and 1183.

[0164] Referring to FIG. 14, the positive electrode layer 1130 may include a first opposing portion 1133, a first lead-out portion 1135 and a third opening 1137.

[0165] The first opposing portion 1133 may be a portion opposing the negative electrode layer 1150 in the thickness direction (T-axis direction). The first opposing portion 1133 occupies most of the positive electrode layer 1130, and may have a substantially ring or donut shape.

[0166] The first lead-out portion 1135 may protrude from the first opposing portion 1133, and connect to the first external electrode 1200. In this case, an outer circumference of the first external electrode 1200 may include a curved portion.

[0167] The third opening 1137 may be disposed in a central portion of the first opposing portion 1133, and may be spaced apart from the through-hole 1400 of the laminate 1100. However, the location of the third opening 1137 is not limited thereto, and the location of the third opening 1137 may vary depending on the location of the through-hole 1400.

[0168] A cross-sectional shape of the third opening 1137 may be similar to a cross-sectional shape of the through-hole 1400. For example, the cross-sectional shape of the third opening 1137 may be circular or elliptical.

[0169] Referring to FIG. 13 and FIG. 14, an outer margin portion 1181 may be disposed on the outside of the first opposing portion 1133, and an inner margin portion 1183 may be disposed between the third opening 1137 and the through-hole 1400.

[0170] Referring to FIG. 15, the negative electrode layer 1150 may include a second opposing portion 1153, a second lead-out portion 1155 and a fourth opening 1157.

[0171] The second opposing portion 1153 may be a portion opposing the positive electrode layer 1130 in the thickness direction (T-axis direction). The second opposing portion 1153 occupies most of the negative electrode layer 1150, and may have a substantially ring or donut shape.

[0172] The second lead-out portion 1155 may protrude from the second opposing portion 1153, and be connected to the second external electrode 1300. In this case, an outer circumference of the second external electrode 1300 may include a curved portion.

[0173] The fourth opening 1157 may be disposed in a central portion of the second opposing portion 1153, and may be spaced apart from the through-hole 1400 of the laminate 1100. However, the location of the fourth opening 1157 is not limited thereto, and the location of the fourth opening 1157 may vary depending on the location of the through-hole 1400.

[0174] A cross-sectional shape of the fourth opening 1157 may be similar to the cross-sectional shape of the through-hole 1400. For example, the cross-sectional shape of the fourth opening 1157 may be circular or elliptical.

[0175] Referring to FIG. 13 and FIG. 15, the outer margin portion 1181 may be disposed on the outside of the second opposing portion 1153, and the inner margin portion 1183 may be disposed between the fourth opening 1157 and the through-hole 1400.

[0176] The other components except for the above are the same as or correspond to those of the all-solid-state battery shown in FIG. 1, so repeated description thereof will be omitted.

[0177] While this disclosure has been described in connection with what are presently considered practical embodiments, it is understood that the disclosure is not limited to the disclosed embodiments but is intended to cover various modifications and equivalent arrangements within the spirit and scope of the appended claims.

[0178] <Description of symbols>

[0179] 1000, 2000: all-solid-state battery

[0180] 100, 1100: laminate

[0181] 110, 1110: solid electrolyte layer

[0182] 130, 1130: positive electrode layer

[0183] 150, 1150: negative electrode layer

[0184] 160, 1160: upper protective layer

[0185] 170, 1170: lower protective layer

[0186] 180, 1180: margin portion

[0187] 200, 1200: first external electrode

[0188] 300, 1300: second external electrode

[0189] 400, 1400: through-hole

[0190] 500: straight portion

[0191] 600: curved portion

Claims

1.An all-solid-state battery, comprising:a laminate comprising a positive electrode layer, a solid electrolyte layer and a negative electrode layer stacked along a first direction;a first external electrode disposed outside the laminate and connected to the positive electrode layer; anda second external electrode disposed outside the laminate and connected to the negative electrode layer,wherein a through-hole is disposed in a central portion of the laminate along the first direction, andwherein an outer circumference of the laminate comprises a curved portion when viewed in the first direction.2.The all-solid-state battery of claim 1, wherein, when viewed in the first direction, the through-hole is circular, and the outer circumference of the laminate is circular.3.The all-solid-state battery of claim 2, wherein a center of the through-hole and a center of the outer circumference of the laminate are aligned.4.The all-solid-state battery of claim 1, wherein, when viewed in the first direction, the through-hole is circular, and a radius of the through-hole is the same as a radius of curvature of the curved portion.5.The all-solid-state battery of claim 1, wherein, when viewed in the first direction, the through-hole is circular, and a radius of the through-hole is different from a radius of curvature of the curved portion.6.The all-solid-state battery of claim 1, wherein, when viewed in the first direction, the outer circumference of the laminate further comprises a straight portion connected to the curved portion.7.The all-solid-state battery of claim 6, wherein the straight portion comprises:a first straight portion and a second straight portion opposed to each other in a second direction intersecting the first direction; anda third straight portion and a fourth straight portion opposed to each other in a third direction intersecting the second direction.8.The all-solid-state battery of claim 7, wherein:the first straight portion and the second straight portion have the same length; andthe third straight portion and the fourth straight portion have the same length.9.The all-solid-state battery of claim 8, wherein the first straight portion, the second straight portion, the third straight portion and the fourth straight portion all have the same length.10.The all-solid-state battery of claim 7, wherein the curved portion comprises:a first curved portion disposed between the first straight portion and the fourth straight portion;a second curved portion disposed between the fourth straight portion and the second straight portion;a third curved portion disposed between the second straight portion and the third straight portion; anda fourth curved portion disposed between the third straight portion and the first straight portion.11.The all-solid-state battery of claim 6, wherein, when viewed in the first direction, the through-hole is circular, and a radius of the through-hole is the same as a radius of curvature of the curved portion.12.The all-solid-state battery of claim 6, wherein, when viewed in the first direction, the through-hole is circular, and a radius of the through-hole is different from a radius of curvature of the curved portion.13.An all-solid-state battery, comprising:a laminate comprising a positive electrode layer, a solid electrolyte layer, and a negative electrode layer stacked along a first direction;a first external electrode disposed outside the laminate and connected to the positive electrode layer;a second external electrode disposed outside the laminate and connected to the negative electrode layer;a through-hole disposed in a central portion of the laminate along the first direction; anda margin portion disposed between the through-hole and the solid electrolyte layer, the margin portion comprising an insulating material.14.The all-solid-state battery of claim 13, wherein the margin portion further comprises an inner margin portion adjacent to the through-hole and an outer margin portion adjacent to the solid electrolyte layer.15.The all-solid-state battery of claim 13, wherein the insulating material of the margin portion comprises at least one selected from the group consisting of alumina (Al₂O₃), silicon dioxide (SiO₂), and boron nitride (BN).

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