All-solid-state battery

Abstract

An embodiment provides an all-solid-state battery, including: a laminate that includes a positive electrode layer, a solid electrolyte layer, and a negative electrode layer stacked in a first direction and is curved in the first direction to have a curved surface, a first external electrode disposed on the outside of the laminate and connected to the positive electrode layer, and a second external electrode disposed on the outside of the laminate and connected to the negative electrode layer, wherein the laminate includes a cover layer disposed on an outermost side in the first direction, and a margin portion disposed on an outermost side in a second direction crossing the first direction.

Description

ALL-SOLID-STATE BATTERY

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

[0002] Since currently commercially available lithium ion batteries use an electrolyte containing a flammable organic solvent, there is a possibility of overheating and fire when a short circuit occurs. 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 all-solid-state batteries that may be installed in wearable electronic devices of various shapes are in demand.

[0004] The present disclosure attempts to provide an all-solid-state battery that may be installed 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 embodiment provides an all-solid-state battery, including: a laminate that includes a positive electrode layer, a solid electrolyte layer, and a negative electrode layer stacked in a first direction and is curved in the first direction to have a curved surface, a first external electrode disposed on the outside of the laminate and connected to the positive electrode layer, and a second external electrode disposed on the outside of the laminate and connected to the negative electrode layer, wherein the laminate includes a cover layer disposed on an outermost side in the first direction, and a margin portion disposed on an outermost side in a second direction crossing the first direction.

[0007] The laminate may include a first surface and a second surface that are opposite to each other in the first direction, the first surface may have a first radius of curvature, and the second surface may have a second radius of curvature.

[0008] The first radius of curvature may be smaller than the second radius of curvature.

[0009] When viewed in the second direction, the first surface and the second surface may have a circular arc shape or an elliptical arc shape.

[0010] When viewed in the second direction, the first surface and the second surface may form portions of concentric circles.

[0011] The positive electrode layer, the solid electrolyte layer, and the negative electrode layer may each have a curved surface corresponding to the laminate.

[0012] The laminate may include a first end surface and a second end surface disposed on opposite sides to each other in a third direction extending to simultaneously cross the first direction and the second direction between the first surface and the second surface, the first external electrode may be disposed on the first end surface, and the second external electrode may be disposed on the second end surface.

[0013] The laminate may include a third surface and a fourth surface disposed opposite to each other in the second direction, and the margin portion may include a first margin portion disposed on the third surface and a second margin portion disposed on the fourth surface.

[0014] One embodiment provides an all-solid-state battery, including: a laminate that includes a positive electrode layer, a solid electrolyte layer, and a negative electrode layer stacked in a first direction, is curved in the first direction to have a curved surface, and includes a first surface and a second surface that are opposite to each other in the first direction, a first external electrode disposed on the outside of the laminate and connected to the positive electrode layer in a second direction crossing the first direction, and a second external electrode disposed on the outside of the laminate and connected to the negative electrode layer in the second direction, wherein the laminate includes a cover layer disposed on an outermost side in the first direction, and a margin portion disposed on an outermost side in a third direction extending to simultaneously cross the first direction and the second direction between the first surface and the second surface.

[0015] The first surface may have a first radius of curvature, and the second surface may have a second radius of curvature.

[0016] The first radius of curvature may be smaller than the second radius of curvature.

[0017] When viewed in the second direction, the first surface and the second surface may have a circular arc shape or an elliptical arc shape.

[0018] When viewed in the second direction, the first surface and the second surface may form portions of concentric circles.

[0019] The laminate may include a third surface and a fourth surface disposed opposite to each other in the second direction, the first external electrode may be disposed on the third surface, and the second external electrode may be disposed on the fourth surface.

[0020] The laminate may include a first end surface and a second end surface disposed on opposite sides to each other in the third direction, and the margin portion may include a first margin portion disposed on the first end surface and the second margin portion disposed on the second end surface.

[0021] The all-solid-state battery according to the embodiment may be mounted in a ring-shaped wearable electronic device.

[0022] One embodiment provides an all-solid-state battery comprising a laminate including a stack. The stack comprises a positive electrode layer, a negative electrode layer disposed on the positive electrode layer, a solid electrolyte layer disposed therebetween, each being curved along parallel curves. The laminate has opposing curved external surfaces, and a cover layer disposed on outermost sides of the stack along the curved external surfaces, opposing planar surfaces in planes perpendicular to the pair of curved surfaces and a margin layer disposed on outermost sides of the stack along the planar surfaces, and opposing end surfaces disposed on opposite ends of the laminate and perpendicular to the stack. The all-solid-state battery further includes a first external electrode connected to the positive electrode layer; and a second external electrode connected to the negative electrode layer.

[0023] In some embodiments, the first and second external electrodes may be disposed on the opposing end surfaces. In some embodiments, the first and second external electrodes may be disposed on the opposing planar surfaces.

[0024] FIG. 1 illustrates a schematic perspective view of an all-solid-state battery according to an embodiment of the present disclosure.

[0025] FIG. 2 illustrates a top plan view of the all-solid-state battery of FIG. 1.

[0026] FIG. 3 schematically illustrates a perspective view of a laminate of FIG. 1.

[0027] FIG. 4 schematically illustrates a front view of the laminate of FIG. 1.

[0028] FIG. 5 illustrates a cross-sectional view taken along line I-I' of FIG. 1.

[0029] FIG. 6 illustrates a cross-sectional view taken along line II-II' of FIG. 2.

[0030] FIG. 7 schematically illustrates a partial cross-sectional view of a positive electrode layer of the all-solid-state battery of FIG. 1.

[0031] FIG. 8 schematically illustrates a partial cross-sectional view of a negative electrode layer of the all-solid-state battery of FIG. 1.

[0032] FIG. 9 schematically illustrates a cross-sectional view of the all-solid-state battery of FIG. 1.

[0033] FIG. 10 schematically illustrates a perspective view of a positive electrode layer of the all-solid-state battery of FIG. 1.

[0034] FIG. 11 schematically illustrates a perspective view of a negative electrode layer of the all-solid-state battery of FIG. 1.

[0035] FIG. 12 illustrates a schematic perspective view of an all-solid-state battery according to another embodiment of the present disclosure.

[0036] FIG. 13 illustrates a schematic perspective view of a laminate of FIG. 12.

[0037] FIG. 14 is a drawing taken along line III-III' of FIG. 12.

[0038] FIG. 15 illustrates a top plan view of FIG. 13.

[0039] FIG. 16 illustrates a bottom view of FIG. 13.

[0040] FIG. 17 schematically illustrates a perspective view of a positive electrode layer of the all-solid-state battery of FIG. 12.

[0041] FIG. 18 schematically illustrates a perspective view of a negative electrode layer of the all-solid-state battery of FIG. 12.

[0042] FIG. 19 schematically illustrates a perspective view of a ring-shaped wearable electronic device equipped with an all-solid-state battery according to an embodiment.

[0043] The present disclosure will be described more fully 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 like elements throughout the specification. In addition, some constituent elements are exaggerated, omitted, or briefly illustrated in the added drawings, and sizes of the respective constituent elements do not reflect the actual sizes.

[0044] 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.

[0045] Terms including an ordinal number, such as first, second, etc., may be used to describe various elements, but the elements are not limited by the terms. These terms are only used to differentiate one constituent element from another.

[0046] It should be understood that when an element such as a layer, film, region, area or substrate is referred to as being "on" 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. Further, in the specification, the word "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.

[0047] 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 described to the contrary, 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.

[0048] Further, 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.

[0049] Furthermore, throughout the specification, "connected" does not only 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.

[0050] FIG. 1 illustrates a schematic perspective view of an all-solid-state battery according to an embodiment of the present disclosure, FIG. 2 illustrates a top plan view of the all-solid-state battery of FIG. 1, FIG. 3 schematically illustrates a perspective view of a laminate of FIG. 1, and FIG. 4 schematically illustrates a front view of the laminate of FIG. 1.

[0051] Referring to FIG. 1 and FIG. 2, 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.

[0052] Referring to FIG. 2, FIG. 3, and FIG. 4, the laminate 100 may have a partial doughnut shape or a partial ring shape, and may include a solid electrolyte layer 110, a positive electrode layer 130, and a negative electrode layer 150.

[0053] The laminate 100 is a structure made by stacking the solid electrolyte layer 110, the positive electrode layer 130, and the negative electrode layer 150, and may have a shape curved about a z-axis direction. That is, the laminate 100 has a curvature by being curved in a direction crossing the z-axis direction.

[0054] For example, a laminate having a cubic or rectangular parallelepiped shape may be placed in a jig with a curved surface and subjected to pressure to bend the laminate to have a curved surface.

[0055] The laminate 100 may include a first surface S1, a second surface S2, a third surface S3, a fourth surface S4, a fifth surface S5, and a sixth surface S6.

[0056] The first surface S1 and the second surface S2 oppose each other in the z-axis direction. That is, the first surface S1 and the second surface S2 may be disposed on opposite sides to each other in the z-axis direction.

[0057] The third surface S3 may be a curved surface connecting the first surface S1 and the second surface S2, and the fourth surface S4 may be another curved surface connecting the first surface S1 and the second surface S2. Here, for convenience of description, a direction of an arbitrary straight line that is substantially perpendicular to the z-axis direction and simultaneously passing through the third surface S3 and the fourth surface S4 is defined as "a first direction". Accordingly, the third surface S3 and the fourth surface S4 may be disposed on opposite sides to each other in the first direction. For example, when the fourth surface S4 has an arc shape, a direction along the straight line R-R' passing through its center O may be the first direction. Hereinafter, the "first direction" may be referred to as a "radial direction" as needed.

[0058] Here, the radial direction may be a direction perpendicular to a wide surface (main surface) of sheet-like components

[0059] For example, the radial direction may be used as the same concept as a direction in which components of the laminate 100 are stacked.

[0060] Meanwhile, the z-axis direction is a direction crossing the first direction and may correspond to a "second direction".

[0061] When viewed in the z-axis direction, the third surface S3 and the fourth surface S4 of the laminate 100 may have a curvature, respectively. That is, the third surface S3 may have a first radius of curvature, and the fourth surface S4 may have a second radius of curvature. The second radius of curvature may be smaller than the first radius of curvature.

[0062] For example, the third surface S3 and the fourth surface S4 may have a circular arc shape or an elliptical arc shape. As another example, the third surface S3 and the fourth surface S4 may form portions of concentric circles.

[0063] Here, for convenience of description, a direction following an imaginary curved surface (or curved line) (C-C’) extending to simultaneously cross the z-axis direction and the radial direction between the third surface S3 and the fourth surface S4 of the laminate 100 is defined as a "third direction". Hereinafter, the "third direction" may be referred to as a "circumferential direction" as needed.

[0064] The fifth surface S5 and the sixth surface S6 may be both end surfaces of the laminate 100 in the circumferential direction. That is, the fifth surface S5 and the sixth surface S6 may be disposed on opposite sides to each other in the circumferential direction.

[0065] FIG. 5 illustrates a cross-sectional view taken along line I-I' of FIG. 1, and FIG. 6 illustrates a cross-sectional view taken along line II-II' of FIG. 1.

[0066] Referring to FIG. 4, FIG. 5, and FIG. 6, the laminate 100 may include a solid electrolyte layer 110, a positive electrode layer 130, a negative electrode layer 150, a first cover layer 160, a second cover layer 170, and a margin portion 180.

[0067] 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 radial direction with the solid electrolyte layer 110 therebetween. The stacked structure may be repeated within the laminate 100, and the electrode layer closest to the third surface S3 of the laminate 100 may be the positive electrode layer 130 or the negative electrode layer 150, and the electrode layer closest to the fourth surface S4 may be the negative electrode layer 150 or the positive electrode layer 130.

[0068] 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 other surface of the solid electrolyte layer 110.

[0069] The solid electrolyte layer 110 includes a solid electrolyte. The solid electrolyte may serve as a passage for lithium (Li) ions.

[0070] The solid electrolyte included in the solid electrolyte layer 110 may include a glass-ceramic electrolyte including lithium halide (halogen elements such as LiX, X=F, Br, Cl, and I). The glass-ceramic (or crystallization glass) refers to 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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).

[0076] 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.

[0077] In an area where the margin portion 180 to be described later is disposed, there may be a material with low ionic conductivity and low electrical conductivity, that is, an insulating material, or a material with ionic conductivity (or electrical conductivity) similar to that of the solid electrolyte. For example, when the material having ion conductivity (or electrical conductivity) similar to that of the solid electrolyte exists in this area, the material may be the same material as the solid electrolyte in the other area or may be a different material. As another example, the material having the ion conductivity (or electrical conductivity) similar to that of the solid electrolyte and the insulating material may coexist in this area.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] The positive electrode layer 130 may be exposed outside of the laminate 100 from the fifth surface S5, and may be connected to the first external electrode 200.

[0082] FIG. 7 schematically illustrates a partial cross-sectional view of a positive electrode layer of the all-solid-state battery of FIG. 1.

[0083] Referring to FIG. 7, 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.

[0084] The positive electrode current collector 133 may be made of, for example, a plate-shaped member or a thin member. As another example, the positive electrode current collector 133 may be a porous body having a reticulate shape, a mesh shape, or the like.

[0085] 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 radial direction.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] Meanwhile, the positive electrode current collector may also include one or more types of solid electrolyte.

[0090] The first positive electrode active material layer 135 and the second positive electrode active material layer 136 may include a positive active material, 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 active material on one or both surfaces of the positive electrode current collector 133, but the method of forming the positive electrode active material layer is not limited thereto.

[0091] The positive active material included in the positive electrode active material layers 135 and 136 may comprise a material containing lithium (Li) ions. The positive active material may reversibly intercalate and deintercalate lithium ions. In other words, the positive active material may contain lithium ions and may serve to provide the lithium ions to the negative electrode when the all-solid-state battery is charging. The positive active material may affect the capacity and output of an all-solid-state battery.

[0092] 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, where in the above formula, A is Ni, Co, or Mn; M is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, Nb, Ti or rare-earth element; D is O, F, S, or P; E is Co or Mn; X is F, S, or P; G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, or V; Q is Ti, Mo or Mn; R is Cr, V, Fe, Sc, or Y; J is V, Cr, Mn, Co, Ni, or Cu.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] FIG. 9 schematically illustrates a cross-sectional view of the all-solid-state battery of FIG. 1, and FIG. 10 schematically illustrates a top plan view of a positive electrode layer of the all-solid-state battery of FIG. 1.

[0099] Referring to FIG. 9 and FIG. 10, the positive electrode layer 130 has a shape corresponding to a shape of the laminate 100. That is, the positive electrode layer 130 has a partial doughnut shape or a partial ring shape.

[0100] The edges of the positive electrode layer 130, except for the portion where the positive electrode layer 130 is connected to the first external electrode 200, may be spaced apart from the edges of the laminate 100, and the margin portion 180 may be disposed in the space therebetween. The margin portion 180 may include, for example, a first margin portion 181 and a second margin portion 182 disposed opposite to each other in the z-axis direction, and a third margin portion 183 in contact with one end of the positive electrode layer 130 in the circumferential direction. However, in the following description, the first margin portion 181, the second margin portion 182, and the third margin portion 183 will collectively be referred to as the margin portion 180, as needed.

[0101] The negative electrode layer 150 may be exposed outside of the laminate 100 from the sixth surface S6 and connected to the second external electrode 300.

[0102] FIG. 8 schematically illustrates a partial cross-sectional view of a negative electrode layer of the all-solid-state battery of FIG. 1.

[0103] Referring to FIG. 8, 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.

[0104] 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.

[0105] 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 radial direction.

[0106] 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.

[0107] In addition, the negative electrode current collector 153 may be coated with an oxidation-resistant metal or an oxidation-resistant alloy film to prevent oxidation.

[0108] 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.

[0109] 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 of forming the negative electrode active material layer is not limited thereto.

[0110] The negative electrode active material included in the negative electrode active material layers 155 and 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.

[0111] 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.

[0112] 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, Bi, S, Se, Te, Po, or combinations thereof.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] The negative active material may optionally include a conductive material and a binder.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] FIG. 11 schematically illustrates a perspective view of a negative electrode layer of the all-solid-state battery of FIG. 1.

[0121] Referring to FIG. 9 and FIG. 11, the negative electrode layer 150 has a shape corresponding to the shape of the laminate 100. That is, the negative electrode layer 150 may have a partial doughnut shape or a partial ring shape.

[0122] The edges of the negative electrode layer 150, except for a portion where the negative electrode layer 150 is connected to the second external electrode 300, may be spaced apart from the edges of the laminate 100, and the margin portion 180 may be disposed in the space therebetween. The margin portion 180 may include, for example, a first margin portion 181 and a second margin portion 182 disposed opposite to each other in the z-axis direction, and a fourth margin portion 184 in contact with one end of the negative electrode layer 150 in the circumferential direction. However, in the following description, the first margin portion 181, the second margin portion 182, and the fourth margin portion 184 will collectively be referred to as the margin portion 180, as needed.

[0123] Referring to FIG. 4, FIG. 5 and FIG. 6, the first cover layer 160 and the second cover layer 170 may be outermost layers disposed on the third surface S3 and the fourth surface S4 of the laminate 100, respectively. That is, the first cover layer 160 may be the outermost layer disposed on the third surface S3 of the laminate 100, and the second cover layer 170 may be the outermost layer disposed on the fourth surface S4 of the laminate 100. The first cover layer 160 and the second cover layer 170 may improve moisture resistance by preventing moisture penetration, and may prevent damage from physical and chemical impacts.

[0124] The first cover layer 160 and the second cover layer 170 may be insulation layers made of an insulating material, that is, a material that is not electrically (ionically) conductive.

[0125] The first cover layer 160 and the second cover 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), nitride gallium (GaN), barium titanate (BaTiO3), zirconium dioxide (ZrO2), mixture thereof, oxide and / or nitride of these materials, or any other appropriate ceramic material, but is not limited thereto. In addition, the first cover layer 160 and the second cover layer 170 may selectively include the above-mentioned solid electrolytes, and may include one or more types of solid electrolytes, but are not limited thereto.

[0126] The margin portion 180 may be disposed along the edges of the positive electrode layer 130 and the negative electrode layer 150. The margin portion 180 may be disposed to be in contact with the remaining edges of the positive electrode layer 130, except where the positive electrode layer 130 is connected to the first external electrode 200. In addition, the margin portion 180 may be disposed to be in contact with the remaining edges of the negative electrode layer 150, except where the negative electrode layer 150 is connected to the second external electrode 300.

[0127] For example, the margin portion 180 may be disposed on the solid electrolyte layer 110 in a region other than the region where the positive electrode layer 130 or the negative electrode layer 150 is disposed. When the positive electrode layer 130 is disposed on the solid electrolyte layer 110, the margin portion 180 may be disposed in a region other than the region where the positive electrode layer 130 is disposed. Likewise, when the negative electrode layer 150 is disposed on the solid electrolyte layer 110, the margin portion 180 may be disposed in a region other than the region where the negative electrode layer 150 is disposed.

[0128] Referring to FIG. 5 and FIG. 6, the margin portion 180 may comprise a portion of the fifth surface S5 and a portion of the sixth surface S6 of the laminate 100. In addition, referring to FIG. 4, the margin portion 180 may comprise a portion of the first surface S1 and a portion of the second surface S2 of the laminate 100.

[0129] The margin portion 180 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 margin portion 180 may be disposed on the same surface as the positive electrode layer 130 and the negative electrode layer 150. The margin portion 180 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.

[0130] Meanwhile, the margin portion 180 may include a material that is resistant to moisture and has 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.

[0131] The margin portion 180 may include an insulating material, that is, a material that is not electrically (ionically) conductive.

[0132] 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), nitride gallium (GaN), barium titanate (BaTiO3), zirconium dioxide (ZrO2), mixture thereof, oxides thereof and / or nitrides thereof, or any suitable ceramic materials.

[0133] Meanwhile, 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.

[0134] In addition, a material having a low ionic conductivity and electrical conductivity, such as an insulating material, may be present in the margin portion 180, or a material having an ionic conductivity (or electrical conductivity) similar to the ionic conductivity (or electrical conductivity) of a solid electrolyte may be present in the margin portion 180.

[0135] 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.

[0136] Referring to FIG. 1 and FIG. 2, the first external electrode 200 and the second external electrode 300 may be disposed outside the laminate 100.

[0137] Referring to FIG. 5, the first external electrode 200 is connected to the positive electrode layer 130 and the solid electrolyte layer 110 on the fifth surface S5 of the laminate 100. For example, the first external electrode 200 may cover the fifth surface S5 of the laminate 100, and the first external electrode 200 may extend onto the first surface S1, the second surface S2, the third surface S3, and the fourth surface S4 of the laminate 100, to partially cover the respective surfaces.

[0138] 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).

[0139] Referring to FIG. 6, the second external electrode 300 may be connected to the negative electrode layer 150 and the solid electrolyte layer 110 on the sixth surface S6 of the laminate 100. For example, the second external electrode 300 may cover the sixth surface S6 of the laminate 100, and the second external electrode 300 may extend onto the first surface S1, the second surface S2, the third surface S3, and the fourth surface S4 of the laminate 100, to partially cover the respective surfaces.

[0140] 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).

[0141] For example, the fifth surface S5 and the sixth surface S6 of the laminate 100 are 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 fifth surface S5 and the sixth surface S6 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 of 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.

[0142] FIG. 12 illustrates a schematic perspective view of an all-solid-state battery according to another embodiment of the present disclosure, FIG. 13 schematically illustrates a perspective view of a laminate of FIG. 12, and FIG. 14 is a drawing taken along line III-III' of FIG. 12.

[0143] Referring to FIG. 12, FIG. 13, and FIG. 14, an all-solid-state battery 2000 may include a laminate 1100, a first external electrode 1200, a second external electrode 1300.

[0144] The laminate 1100 may have a partial doughnut shape or a partial ring shape, and may include a solid electrolyte layer 1110, a positive electrode layer 1130, and a negative electrode layer 1150.

[0145] The laminate 1100 is a structure made by stacking the solid electrolyte layer 1110, the positive electrode layer 1130, and the negative electrode layer 1150 in the radial direction, and may have a shape curved about the z-axis direction. That is, the laminate 1100 has a curvature by being curved in a direction crossing the z-axis direction.

[0146] The laminate 1100 may include a solid electrolyte layer 1110, a positive electrode layer 1130, a negative electrode layer 1150, a first cover layer 1160, a second cover layer 1170, and a margin portion 1180.

[0147] The first external electrode 1200 is connected to the positive electrode layer 1130 and the solid electrolyte layer 1110 on the first surface S1 of the laminate 1100. For example, the first external electrode 1200 may cover the first surface S1 of the laminate 1100, and the first external electrode 1200 may extend onto the third surface S3, the fourth surface S4, the fifth surface S5, and the sixth surface S6 of the laminate 1100, to partially cover the respective surfaces.

[0148] The second external electrode 1300 may be connected to the negative electrode layer 1150 and the solid electrolyte layer 1110 on the second surface S2 of the laminate 1100. For example, the second external electrode 1300 may cover the second surface S2 of the laminate 1100, and the second external electrode 1300 may extend onto the third surface S3, the fourth surface S4, the fifth surface S5, and the sixth surface S6 of the laminate 1100, to partially cover the respective surfaces.

[0149] FIG. 15 illustrates a top plan view of FIG. 13, and FIG. 16 illustrates a bottom view of FIG. 13. FIG. 17 schematically illustrates a perspective view of a positive electrode layer of the all-solid-state battery of FIG. 12, and FIG. 18 schematically illustrates a perspective view of a negative electrode layer of the all-solid-state battery of FIG. 12.

[0150] Referring to FIG. 14, FIG. 15, and FIG. 17, the positive electrode layer 1130 has a shape corresponding to the shape of the laminate 1100. That is, the positive electrode layer 1130 has a partial doughnut shape or a partial ring shape.

[0151] The edges of the positive electrode layer 1130, except for the portion where the positive electrode layer 1130 is connected to the first external electrode 1200 may be spaced apart from the edges of the laminate 1100, and the margin portion 1180 may be disposed in the space therebetween. The margin portion 1180 may include, for example, a first margin portion 1181 and a second margin portion 1182 disposed opposite to each other in the circumferential direction of the positive electrode layer 1130, and a third margin portion 1183 in contact with one end of the positive electrode layer 1130 in the z-axis direction.

[0152] Referring to FIG. 14, FIG. 16, and FIG. 18, the negative electrode layer 1150 has a shape corresponding to the shape of the laminate 100. That is, the negative electrode layer 1150 may have a partial doughnut shape or a partial ring shape.

[0153] The edges of the negative electrode layer 1150, except for the portion where the negative electrode layer 1150 is connected to the second external electrode 1300 may be spaced apart from the edges of the laminate 1100, and the margin portion 1180 may be disposed in the space therebetween. The margin portion 1180 may include, for example, a first margin portion 1181 and a second margin portion 1182 disposed opposite to each other in the circumferential direction, and a fourth margin portion 1184 in contact with one end of the negative electrode layer 1150 in the z-axis direction.

[0154] Remaining components other than the above are the same as or correspond to the components of the all-solid-state battery represented in FIG. 1, and repeated description thereof will be omitted.

[0155] FIG. 19 schematically illustrates a perspective view of a ring-shaped wearable electronic device equipped with an all-solid-state battery according to an embodiment.

[0156] Referring to FIG. 19, the all-solid-state battery 1000 may be mounted inside a ring-shaped wearable electronic device 3000. As with other components 3100, the shape of the all-solid-state battery 1000 corresponds to the shape of the ring-shaped wearable electronic device 3000, and therefore, the all-solid-state battery 1000 may be mounted in the ring-shaped wearable electronic device 3000 without wasting space.

[0157] While this disclosure has been described in connection with what is presently considered to be practical embodiments, it is to be understood that the disclosure is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

[0158] <Description of symbols>

[0159] 1000, 2000: all-solid-state battery

[0160] 100, 1100: laminate

[0161] 110, 1110: solid electrolyte layer

[0162] 130, 1130: positive electrode layer

[0163] 150, 1150: negative electrode layer

[0164] 160, 1160: first cover layer

[0165] 170, 1170: second cover layer

[0166] 180, 1180: margin portion

[0167] 200, 1200: first external electrode

[0168] 300, 1300: second external electrode

Claims

1.An all-solid-state battery, comprising:a laminate that includes a positive electrode layer, a solid electrolyte layer, and a negative electrode layer stacked in a first direction and is curved in the first direction to have a curved surface;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 the laminate includesa cover layer disposed on an outermost side in the first direction, anda margin portion disposed on an outermost side in a second direction crossing the first direction.2.The all-solid-state battery of claim 1, whereinthe laminate includes a first surface and a second surface that are opposite to each other in the first direction,the first surface has a first radius of curvature, andthe second surface has a second radius of curvature.3.The all-solid-state battery of claim 2, whereinthe first radius of curvature is smaller than the second radius of curvature.4.The all-solid-state battery of claim 3, whereinwhen viewed in the second direction, the first surface and the second surface have a circular arc shape or an elliptical arc shape.5.The all-solid-state battery of claim 3, whereinwhen viewed in the second direction, the first surface and the second surface form portions of concentric circles.6.The all-solid-state battery of claim 2, whereinthe positive electrode layer, the solid electrolyte layer, and the negative electrode layer each has a curved surface corresponding to the laminate.7.The all-solid-state battery of claim 2, whereinthe laminate includes a first end surface and a second end surface disposed on opposite sides to each other in a third direction extending to simultaneously cross the first direction and the second direction between the first surface and the second surface,the first external electrode is disposed on the first end surface, andthe second external electrode is disposed on the second end surface.8.The all-solid-state battery of claim 2, whereinthe laminate includes a third surface and a fourth surface disposed opposite to each other in the second direction, andthe margin portion includes a first margin portion disposed on the third surface and a second margin portion disposed on the fourth surface.9.An all-solid-state battery, comprising:a laminate that includes a positive electrode layer, a solid electrolyte layer, and a negative electrode layer stacked in a first direction, is curved in the first direction to have a curved surface, and includes a first surface and a second surface that are opposite to each other in the first direction,a first external electrode disposed outside the laminate and connected to the positive electrode layer in a second direction crossing the first direction, anda second external electrode disposed outside the laminate and connected to the negative electrode layer in the second direction,wherein the laminate includesa cover layer disposed on an outermost side in the first direction, anda margin portion disposed on an outermost side in a third direction extending to simultaneously cross the first direction and the second direction between the first surface and the second surface.10.The all-solid-state battery of claim 9, whereinthe first surface has a first radius of curvature, andthe second surface has a second radius of curvature.11.The all-solid-state battery of claim 10, whereinthe first radius of curvature is smaller than the second radius of curvature.12.The all-solid-state battery of claim 11, whereinwhen viewed in the second direction, the first surface and the second surface have a circular arc shape or an elliptical arc shape.13.The all-solid-state battery of claim 11, whereinwhen viewed in the second direction, the first surface and the second surface form portions of concentric circles.14.The all-solid-state battery of claim 9, whereinthe laminate includes a third surface and a fourth surface disposed opposite to each other in the second direction,the first external electrode is disposed on the third surface, andthe second external electrode is disposed on the fourth surface.15.The all-solid-state battery of claim 9, whereinthe laminate includes a first end surface and a second end surface disposed on opposite sides to each other in the third direction, andthe margin portion includes a first margin portion disposed on the first end surface and a second margin portion disposed on the second end surface.16.An all-solid-state battery, comprising:a laminate including a stack comprising:a positive electrode layer,a negative electrode layer disposed on the positive electrode layer,a solid electrolyte layer disposed therebetween,each being curved along parallel curves,the laminate having:opposing curved external surfaces, and a cover layer disposed on outermost sides of the stack along the curved external surfaces,opposing planar surfaces in planes perpendicular to the pair of curved surfaces and a margin layer disposed on outermost sides of the stack along the planar surfaces, andopposing end surfaces disposed on opposite ends of the laminate and perpendicular to the stack;a first external electrode connected to the positive electrode layer; anda second external electrode connected to the negative electrode layer.17.The all-solid-state-battery of claim 16, wherein the first external electrode is disposed on a first end surface of the opposing end surfaces with the negative electrode layer being spaced apart from the first end surface and the second external electrode is disposed on a second end surface of the opposing end surfaces with the positive electrode layer being spaced apart from the second end surface.18.The all-solid-state-battery of claim 16, wherein the first external electrode is disposed on a first planar surface of the opposing planar surfaces with the negative electrode layer being spaced apart from the first planar surface and the second external electrode is disposed on a second planar surface of the opposing planar surfaces with the positive electrode layer being spaced apart from the second planar surface.19.The all-solid-state-battery of claim 16, wherein the curved external surfaces have a circular arc shape and are portions of concentric circles.20.The all-solid-state-battery of claim 16, wherein the curved external surfaces have an elliptical arc shape.

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