All-solid-state battery

Abstract

An all-solid-state battery may include a laminate including a positive electrode layer, a solid electrolyte layer, and a negative electrode layer stacked in 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, where a through-hole is disposed in a central portion of the laminate in the first direction, and a cross-sectional shape of the laminate is trapezoidal.

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 can be installed in wearable electronic devices of various shapes are in demand.

[0004] The present disclosure attempts to provide an all-solid-state battery mountable in wearable electronic devices of various shapes are in demand, such as 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 including a positive electrode layer, a solid electrolyte layer, and a negative electrode layer stacked in 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, where a through-hole is disposed in a central portion of the laminate in the first direction, and a cross-sectional shape of the laminate is trapezoidal.

[0007] A cross-section of the laminate may intersect the positive electrode layer, the solid electrolyte layer and the negative electrode layer.

[0008] The laminate may include a first surface and a second surface disposed opposite each other in the first direction, and an area of the first surface and an area of the second surface may be different.

[0009] The through-hole may include a first opening and a second opening disposed opposite each other in the first direction, and an area of the first opening and an area of the second opening may be substantially the same.

[0010] The through-hole may have a cylindrical shape.

[0011] The through-hole may include a first opening and a second opening disposed opposite each other in the first direction, and an area of the first opening and an area of the second opening may be different.

[0012] The through-hole may have a conical frustum shape.

[0013] When viewed in the first direction, an outer circumference of the laminate may include a curved portion.

[0014] When viewed in the first direction, the through-hole may be circular, and the outer circumference of the laminate is circular.

[0015] A center of the through-hole and a center of the laminate of the outer circumference may be positioned at substantially the same position.

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

[0017] 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.

[0018] When viewed in the first direction, the outer circumference of the laminate may further include a straight portion connected to the curved portion.

[0019] The straight portion may include a first straight portion and a second straight portion that are disposed opposite each other in a second direction intersecting the first direction, and a third straight portion and a fourth straight portion that are disposed opposite each other in a third direction intersecting the first direction and the second direction.

[0020] The first straight portion and the second straight portion may have substantially the same length, and the third straight portion and the fourth straight portion may have substantially the same length.

[0021] The first straight portion, the second straight portion, the third straight portion and the fourth straight portion all may have substantially the same length.

[0022] 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.

[0023] When viewed in the first direction, the through-hole may be circular, and a radius of the through-hole may be substantially the same as a radius of curvature of the curved portion.

[0024] 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.

[0025] An outer margin portion may be disposed on an outer side of the positive electrode layer or the negative electrode layer in a second direction intersecting the first direction and disposed between the solid electrolyte layer and an adjacent solid electrolyte layer in the first direction.

[0026] An inner margin portion may be disposed between the through-hole and inner ends of the positive electrode layer and the negative electrode layer in the second direction.

[0027] The outer margin portion may be further disposed between the positive electrode layer or the negative electrode layer and outer surfaces of the laminate in a third direction intersecting the first direction and the second direction.

[0028] The inner margin portion may surround the through-hole to separate the laminate from the through-hole.

[0029] An all-solid-state battery according to an embodiment may be mounted in a ring-shaped wearable electronic device.

[0030] FIG. 1 is a perspective view schematically showing an all-solid-state battery according to an embodiment.

[0031] FIG. 2 is a perspective view schematically showing the laminate of FIG. 1.

[0032] FIG. 3 is a top plan view schematically showing the laminate of FIG. 1.

[0033] FIG. 4 is a cross-sectional view taken along line I-I' of FIG. 1.

[0034] FIG. 5 is a partial cross-sectional view schematically showing a positive electrode layer of the all-solid-state battery of FIG. 1.

[0035] FIG. 6 is a partial cross-sectional view schematically showing a negative electrode layer of the all-solid-state battery of FIG. 1.

[0036] FIG. 7 is a cross-sectional view taken along line II-II' of FIG. 4.

[0037] FIG. 8 is a cross-sectional view taken along line III-III' of FIG. 4.

[0038] FIG. 9 is a cross-sectional view taken along line IV-IV' of FIG. 1.

[0039] FIG. 10 is a cross-sectional view taken along line V-V' of FIG. 1.

[0040] FIG. 11 is a perspective view schematically showing an all-solid-state battery according to another embodiment.

[0041] FIG. 12 is a perspective view schematically showing the laminate of FIG. 11.

[0042] FIG. 13 is a top plan view schematically showing the laminate of FIG. 11.

[0043] FIG. 14 is a cross-sectional view taken along line VI-VI' of FIG. 11.

[0044] FIG. 15 is a cross-sectional view taken along line VII-VII' of FIG. 14.

[0045] FIG. 16 is a cross-sectional view taken along line VIII-VIII' of FIG. 14.

[0046] FIG. 17 is a cross-sectional view schematically showing an all-solid-state battery according to another embodiment.

[0047] FIG. 18 is a perspective view schematically showing the laminate of FIG. 17.

[0048] FIG. 19 is a cross-sectional view schematically showing an all-solid-state battery according to still another embodiment.

[0049] FIG. 20 is a perspective view schematically showing the laminate of FIG. 19.

[0050] FIG. 21 is a cross-sectional view schematically showing a ring-shaped wearable electronic device on which an all-solid-state battery according to an embodiment is mounted.

[0051] FIG. 22 is a top plan view of FIG. 21.

[0052] 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 components are exaggerated, omitted, or briefly illustrated in the added drawings, and sizes of the respective constituent elements do not reflect the actual sizes.

[0053] 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.

[0054] 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. The terms are only used to differentiate one constituent element from other constituent elements.

[0055] 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. 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] FIG. 1 is a perspective view schematically showing an all-solid-state battery according to an embodiment, FIG. 2 is a perspective view schematically showing a laminate of FIG. 1, FIG. 3 is a top plan view schematically showing 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 showing 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.

[0060] 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.

[0061] Referring to FIG. 2, FIG. 3, and FIG. 4, the laminate 100 may have a generally pyramidal frustum shape, and may include a solid electrolyte layer 110, a positive electrode layer 130, and a negative electrode layer 150.

[0062] The laminate 100 may be formed in a generally pyramidal frustum shape, but the present embodiment is not limited thereto. Due to shrinkage during sintering, the laminate 100 may not have a perfect pyramidal frustum shape, but may have a substantially pyramidal frustum shape. For example, the laminate 100 has a substantially pyramidal frustum shape, but corner or vertex portions may have a round shape.

[0063] 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.

[0064] 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.

[0065] The first surface S1 and the second surface S2 may oppose each other in an x-direction. That is, the first surface S1 and the second surface S2 may be disposed opposite each other in the x-direction.

[0066] The third surface S3 and the fourth surface S4 may oppose each other in a y-direction. That is, the third surface S3 and the fourth surface S4 may be disposed opposite each other in the y-direction.

[0067] The fifth surface S5 and the sixth surface S6 may oppose each other in a z-direction. That is, the fifth surface S5 and the sixth surface S6 may be disposed opposite each other in the z-direction.

[0068] An area of the fifth surface S5 and an area of the sixth surface S6 are different from each other. For example, the area of the sixth surface S6 may be greater than the area of the fifth surface S5.

[0069] Referring to FIG. 4, a cross-sectional shape of the laminate 100 may be trapezoidal. That is, the cross-sectional shape of the laminate 100, which intersects the y-axis and simultaneously intersects the positive electrode layer 130, the solid electrolyte layer 110, and the negative electrode layer 150, may be a trapezoid. For example, a cross-section of the above-described laminate 100 may be perpendicular to the y-axis.

[0070] The fifth surface S5 and the sixth surface S6 of the laminate 100 may be parallel to the x-direction. An inner angle formed by the first surface S1 and the sixth surface S6 of the laminate 100 may be acute, and an inner angle formed by the first surface S1 and the fifth surface S5 may be obtuse. An inner angle formed by the second surface S2 and the sixth surface S6 of the laminate 100 may be acute, and an inner angle formed by the second surface S2 and the fifth surface S5 may be obtuse.

[0071] The laminate 100 may include a through-hole 400.

[0072] For example, when viewed in the z-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 spaced apart from an outer circumference of the laminate 100 and disposed at any location in the interior.

[0073] The through-hole 400 has a shape that is open toward the fifth surface S5 and the sixth surface S6 of the laminate 100, respectively. That is, the through-hole 400 may include a fifth surface side opening 410 and a sixth surface side opening 420 disposed opposite each other in the first direction. Here, an area of the fifth surface side opening 410 and an area of the sixth surface side opening 420 may be substantially the same.

[0074] For example, the through-hole 400 may have a cylindrical shape. That is, a cross-section of the through-hole 400 intersecting the z-direction may be circular. However, the present embodiment is not limited thereto, and the cross-section of the through-hole 400 may have a variety of shapes, such as elliptical, polygonal, and the like.

[0075] Since the laminate 100 includes the through-hole 400, the all-solid-state battery 1000 according to the present embodiment may be mounted in a ring or doughnut-shaped wearable electronic device with minimal clearance.

[0076] Referring to FIG. 3, in the case that the area of the sixth surface S6 is greater than the area of the fifth surface S5, when viewed in the z-direction, the laminate 100 may have a shape in which an outer circumference of the fifth surface S5 is surrounded by an outer circumference of the sixth surface S6. For better understanding and ease of description, the outer circumference of the fifth surface S5 will be referred to as an uppermost outer circumference UC, and the outer circumference of the sixth surface S6 will be referred to as a lowermost outer circumference LC.

[0077] The uppermost outer circumference UC may include a straight portion 500 and a curved portion 600.

[0078] The straight portion 500 may include a first straight portion 510, a second straight portion 520, a third straight portion 530, and a fourth straight portion 540.

[0079] The first straight portion 510 and the second straight portion 520 are opposite each other in the x-direction of the laminate 100. For example, both the first straight portion 510 and the second straight portion 520 may be parallel to the y-direction.

[0080] The third straight portion 530 and the fourth straight portion 540 are opposite each other in the y-direction of the laminate 100. For example, the third straight portion 530 and the fourth straight portion 540 may be parallel to the x-direction.

[0081] The first straight portion 510 and the second straight portion 520 may have substantially the same length, and the third straight portion 530 and the fourth straight portion 540 may have substantially the same length. In this case, when viewed in the z-direction, the uppermost outer circumference UC of the laminate 100 may have a generally rectangular shape.

[0082] Meanwhile, the first straight portion 510, the second straight portion 520, the third straight portion 530, and the fourth straight portion 540 may all have substantially the same length. In this case, when viewed in the z-direction, the uppermost outer circumference UC of the laminate 100 may have a generally square shape.

[0083] On the other hand, 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.

[0084] The curved portion 600 may include a first curved portion 610, a second curved portion 620, a third curved portion 630, and a fourth curved portion 640.

[0085] The first curved portion 610 may be disposed 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] As such, the uppermost outer circumference UC of the laminate 100 may have a shape in which the respective straight portions 510, 520, 530, and 540 and the respective 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 are not limited to the above, and may be three, or five or more, respectively.

[0090] The first curved portion 610, the second curved portion 620, the third curved portion 630, and the fourth curved portion 640 may all have substantially the same radius of curvature.

[0091] For example, if the first curved portion 610, the second curved portion 620, the third curved portion 630, and the fourth curved portion 640 may all have substantially the same radius of curvature and a cross-sectional shape of the through-hole 400 is a circle, the radius of the through-hole 400 may be substantially the same as the radius of curvature of the curved portion 600.

[0092] As another 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 substantially the same radius of curvature and the cross-sectional shape of the through-hole 400 is a circle, 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 (10) times of the radius of curvature of the curved portion 600. As another example, the radius of the through-hole 400 may be five (5) times of the radius of curvature of the curved portion 600. However, the present embodiment is not limited thereto.

[0093] As used herein, the expression “substantially the same length” or “substantially the same radius” may refer to being at the same length or radius relative to the length or radius compared therewith, as will be appreciated by those of skill in the art, and allows for approximations, inaccuracies and limits of measurement under the relevant circumstances. In one or more aspects, the terms “substantially,” “about,” and “approximately” may provide an industry-accepted tolerance for their corresponding terms and / or relativity between items, such as a tolerance of ± 1%, ± 5%, or ± 10% of the actual value stated, and other suitable tolerances.

[0094] Meanwhile, the first curved portion 610, the second curved portion 620, the third curved portion 630, and the fourth curved portion 640 may have different radii of curvature, respectively.

[0095] The lowermost outer circumference LC may include a straight portion 700 and a curved portion 800.

[0096] The straight portion 700 may include a first straight portion 710, a second straight portion 720, a third straight portion 730, and a fourth straight portion 740.

[0097] The straight portion 700 of the lowermost outer circumference LC is the same as or corresponds to the straight portion 500 of the uppermost outer circumference UC, except for the position and length thereof, and a redundant description thereof will be omitted.

[0098] The curved portion 800 may include a first curved portion 810, a second curved portion 820, a third curved portion 830, and a fourth curved portion 840.

[0099] The curved portion 800 of the lowermost outer circumference LC is the same as or corresponds to the curved portion 600 of the uppermost outer circumference UC, except for the position and radius of curvature thereof, and a redundant description thereof will be omitted.

[0100] As described above, the laminate 100 of the all-solid-state battery 1000 according to the present embodiment not only includes the through-hole 400, but also includes the curved portions 600 and 800 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 may be mounted in the ring-shaped wearable electronic device with minimal clearance.

[0101] Referring to FIG. 2 and FIG. 4, the laminate 100 may include the solid electrolyte layer 110, the positive electrode layer 130, the negative electrode layer 150, an upper protective layer 160, a lower protective layer 170 and a margin portion 180.

[0102] 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 z-direction with the solid electrolyte layer 110 interposed therebetween. The stacked structure may be repeated 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.

[0103] 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.

[0104] The solid electrolyte layer 110 may include a solid electrolyte. The solid electrolyte may serve as a passage of lithium (Li) ions.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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).

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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 may oppose each other in the z-direction.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] Meanwhile, the positive electrode current collector may also include one or more types of solid electrolytes.

[0123] The first positive electrode active material layer 135 and the second positive electrode active material layer 136 may include a positive electrode 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 the positive electrode active material on one or both surfaces of the positive electrode current collector 133, but the method of forming a positive electrode active material layer is not limited thereto.

[0124] The positive electrode active material included in the first positive electrode active material layer 135 and the second positive electrode 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 may serve to provide the lithium ions to the negative electrode when the all-solid-state battery is charging. The positive electrode active material may affect the capacity and output of an all-solid-state battery.

[0125] For example, the positive electrode 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 a 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 may be V, Cr, Mn, Co, Ni, or Cu.

[0126] The positive electrode active material may also include LiCoO2, LiMnxO2x(where, x =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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] Referring to FIG. 7, the positive electrode layer 130 may include a first opening 137.

[0132] 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.

[0133] A cross-sectional shape of the first opening 137 may be similar to the cross-sectional shape of the through-hole 400. For example, the cross-sectional shape of the first opening 137 may be a circle, an ellipse, or a polygon.

[0134] 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 made of the same material as the x-directional margin portion 180x and the y-directional margin portion 180y, which will be described later.

[0135] 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.

[0136] 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.

[0137] The negative electrode current collector 153 may be made 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.

[0138] 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 may oppose each other in the z-direction.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] The first negative electrode active material layer 155 and the second negative electrode active material layer 156 may include a negative electrode active material, and may 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 the 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.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] 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.

[0148] 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.

[0149] The negative electrode active material may optionally include a conductive material and a binder.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] Referring to FIG. 8, the negative electrode layer 150 may include a second opening 157.

[0154] 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.

[0155] 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 a circle, an ellipse, or a polygon.

[0156] 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 made of the same material as the x-directional margin portion 180x and the y-directional margin portion 180y, which will be described later.

[0157] 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 of the laminate 100 toward the fifth surface S5, and the lower protective layer 170 may be the outermost layer of the laminate 100 toward the sixth surface S6. The upper protective layer 160 and the lower protective layer 170 may improve moisture resistance by preventing moisture penetration, and may prevent damage from physical and chemical impacts.

[0158] The upper protective layer 160 and the lower protective layer 170 may be an insulating layer made of an insulating material, that is, a material that is not electrically (ionically) conductive.

[0159] 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), nitride gallium (GaN), barium titanate (BaTiO3), zirconium dioxide (ZrO2), mixture thereof, oxide thereof and / or nitride thereof, or any other suitable ceramic material, but are not limited thereto. In addition, the upper protective layer 160 and the lower protective layer 170 may optionally include the above-described solid electrolyte, and may include one or more types of solid electrolytes, but are not limited thereto.

[0160] Referring to FIG. 4, FIG. 7, FIG. 8, FIG. 9, and FIG. 10, the margin portion 180 may include the x-directional margin portion 180x, the y-directional margin portion 180y, and the inner margin portion 189.

[0161] Referring to FIG. 4, FIG. 7 and FIG. 8, the x-directional margin portion 180x 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.

[0162] Referring to FIG. 7, FIG. 8, FIG. 9 and FIG. 10, the y-directional margin portion 180y may include a third margin portion 185 and a fourth margin portion 187.

[0163] The third margin portion 185 may be in contact with a y-directional first end of the positive electrode layer 130, and the fourth margin portion 187 may be in contact with a y-directional second end of the positive electrode layer 130. In addition, the third margin portion 185 may be in contact with a y-directional first end of the negative electrode layer 150, and the fourth margin portion 187 may be in contact with a y-directional second end of the negative electrode layer 150. That is, the third margin portion 185 and the fourth margin portion 187 may be disposed on the y-direction outer sides of the positive electrode layer 130 and the negative electrode layer 150, respectively.

[0164] The third margin portion 185 may comprise a portion of a third surface S3 of the laminate 100, and the fourth margin portion 187 may comprise a portion of the fourth surface S4.

[0165] The x-directional margin portion 180x and the y-directional margin portion 180y may be disposed on the outer side of 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 outer side 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 outer side of the negative electrode layer 150.

[0166] The x-directional margin portion 180x and the y-directional margin portion 180y 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 x-directional margin portion 180x and the y-directional margin portion 180y may be disposed on the same surface as the positive electrode layer 130 and the negative electrode layer 150. The x-directional margin portion 180x and the y-directional margin portion 180y 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.

[0167] Meanwhile, the inner margin portion 189 may be disposed on the inner side of the first opening 137 of the positive electrode layer 130 and the inner side of the second opening 157 of the negative electrode layer 150.

[0168] Referring to FIG. 4, the inner margin portion 189 may be disposed between the lower protective layer 170 and the upper protective layer 160, such that the positive electrode layer 130, the negative electrode layer 150, and the solid electrolyte layer 110 are spaced apart 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 in which the solid electrolyte layer 110 and the inner side margin portion 189 are alternately stacked may be in contact with the through-hole 400.

[0169] 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, lithium (Li) ion leakage, or the like. 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.

[0170] The margin portion 180 may include an insulating material, that is, a material that is not electrically (ionically) conductive.

[0171] 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, oxide thereof and / or nitride thereof, or any other suitable ceramic material, but it is not limited thereto.

[0172] 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.

[0173] 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. 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.

[0174] The first external electrode 200 and the second external electrode 300 may be disposed on the outside of the laminate 100.

[0175] The first external electrode 200 may be 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 the first external electrode 200 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.

[0176] Meanwhile, in other embodiments, the first external electrode 200 may extend onto one of the fifth surface S5 and the sixth surface S6 of the laminate 100, to partially cover the corresponding surface.

[0177] 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).

[0178] 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.

[0179] Meanwhile, in other embodiments, 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.

[0180] 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).

[0181] For example, the first surface S1 and the second surface S2 of the laminate 100 may be dipped into a conductive paste and 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, respectively, to form the first external electrode 200 and the second external electrode 300. As still another example, a dry film obtained by drying the 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.

[0182] FIG. 11 is a perspective view schematically showing an all-solid-state battery according to another embodiment, FIG. 12 is a perspective view schematically showing the laminate of FIG. 11, and FIG. 13 is a top plan view schematically showing the laminate of FIG. 11. In addition, FIG. 14 is a cross-sectional view taken along line VI-VI' of FIG. 11, FIG. 15 is a cross-sectional view taken along line VII-VII' of FIG. 14, and FIG. 16 is a cross-sectional view taken along line VIII-VIII' of FIG. 14.

[0183] 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.

[0184] Referring to FIG. 11, FIG. 12, and FIG. 13, the laminate 1100 may have a generally conical frustum shape, and may include a through-hole 1400. When viewed in the z-direction, the through-hole 400 may be circular, and the uppermost outer circumference UC and the lowermost outer circumference LC of the laminate 1100 may be circular. That is, the laminate 1100 has a ring or doughnut shape.

[0185] For example, when viewed in the z-direction, the through-hole 400 and the uppermost outer circumference UC and the lowermost outer circumference LC of the laminate 1100 may form concentric circles. That is, the center of the through-hole 400 may coincide with the center of the uppermost outer circumference UC and the center of the lowermost outer circumference LC of the laminate 1100.

[0186] As another example, when viewed in the z-direction, the center of the through-hole 400 may not coincide with the center of the uppermost outer circumference UC and / or the center of the lowermost outer circumference LC of the laminate 1100. That is, the center of the through-hole 400 may be spaced apart from the center of the uppermost outer circumference UC and / or the center of the lowermost outer circumference LC of the laminate 1100.

[0187] Meanwhile, when viewed in the z-direction, the through-hole 400 and the uppermost outer circumference UC and the lowermost outer circumference LC of the laminate 1100, respectively, may be elliptical.

[0188] Referring to FIG. 14, the laminate 1100 may include a solid electrolyte layer 1110, a positive electrode layer 1130, a negative electrode layer 1150, and a margin portion 1180: 1181 and 1183.

[0189] Referring to FIG. 15, the positive electrode layer 1130 may include a first opposing portion 1133, a first lead-out portion 1135, and a third opening 1137.

[0190] The first opposing portion 1133 may be a portion that is opposed to the negative electrode layer 1150 in the z-direction. The first opposing portion 1133 may occupy the majority of the positive electrode layer 1130, and may have a generally ring or doughnut shape when viewed in the z-direction.

[0191] The first lead-out portion 1135 may protrude from the first opposing portion 1133, and may be connected to the first external electrode 1200. In this case, an outer circumference of the first external electrode 1200 may include a curved portion.

[0192] 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.

[0193] A cross-sectional shape of the third opening 1137 may be similar to the cross-sectional shape of the through-hole 1400. For example, the cross-sectional shape of the third opening 1137 may be a circle or an ellipse.

[0194] Referring to FIG. 14 and FIG. 15, an outer margin portion 1181 may be disposed on the outer side 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.

[0195] Referring to FIG. 16, the negative electrode layer 1150 may include a second opposing portion 1153, a second lead-out portion 1155, and a fourth opening 1157.

[0196] The second opposing portion 1153 may be a portion that is opposed to the positive electrode layer 1130 in the z-direction. The second opposing portion 1153 may occupy the majority of the negative electrode layer 1150, and may have a generally ring or doughnut shape when viewed in the z-direction.

[0197] The second lead-out portion 1155 may protrude from the second opposing portion 1153, and may 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.

[0198] 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.

[0199] 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 a circle or an ellipse.

[0200] Referring to FIG. 14 and FIG. 16, the outer margin portion 1181 may be disposed on the outer side 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.

[0201] The remaining components except for the above is the same as or corresponds to the components of the all-solid-state battery shown in FIG. 1, and a redundant description thereof will be omitted.

[0202] FIG. 17 is a cross-sectional view schematically showing an all-solid-state battery according to another embodiment, and FIG. 18 is a perspective view schematically showing the laminate of FIG. 17.

[0203] Referring to FIG. 17 and FIG. 18, an all-solid-state battery 3000 may include a laminate 2100, a first external electrode 2200, and a second external electrode 2300.

[0204] The laminate 2100 may be a structure made by stacking a solid electrolyte layer 2110, a positive electrode layer 2130, and a negative electrode layer 2150. The laminate 2100 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.

[0205] The laminate 2100 may have a generally pyramidal frustum shape, and may include a through-hole 2400.

[0206] The through-hole 2400 may have a generally conical frustum shape.

[0207] The through-hole 2400 has a shape that is open toward the fifth surface S5 and the sixth surface S6 of the laminate 2100, respectively. That is, the through-hole 2400 may include a fifth surface side opening 2410 and a sixth surface side opening 2420. Here, an area of the fifth surface side opening 2410 and an area of the sixth surface side opening 2420 may be different.

[0208] Referring to FIG. 17, a cross-sectional shape of the through-hole 2400 may be trapezoidal. For example, a cross-section of the through-hole 2400 intersecting the y-direction may have a shape that widens from the fifth surface S5 toward the sixth surface S6 of the laminate 2100.

[0209] The laminate 2100 may include an upper protective layer 2160, a lower protective layer 2170, and margin portions 2180, 2181, 2183, and 2189.

[0210] The remaining components except for the above is the same as or corresponds to the components of the all-solid-state battery shown in FIG. 1, and a redundant description thereof will be omitted.

[0211] FIG. 19 is a cross-sectional view schematically showing an all-solid-state battery according to still another embodiment, and FIG. 20 is a perspective view schematically showing the laminate of FIG. 19.

[0212] Referring to FIG. 19 and FIG. 20, an all-solid-state battery 4000 may include a laminate 3100, a first external electrode 3200, and a second external electrode 3300.

[0213] The laminate 1100 may include a solid electrolyte layer 3110, a positive electrode layer 3130, a negative electrode layer 3150, and margin portions 3180: 3181 and 3183).

[0214] The positive electrode layer 3130 may include a first opposing portion 3133 and a first lead-out portion 3135. The negative electrode layer 3150 may include a second opposing portion 3153 and a second lead-out portion 3155.

[0215] The laminate 3100 may have a generally conical frustum shape, and may include a through-hole 3400.

[0216] The through-hole 3400 may have a generally conical frustum shape.

[0217] The through-hole 3400 has a shape that is open toward the fifth surface S5 and the sixth surface S6 of the laminate 3100, respectively. That is, the through-hole 3400 may include a fifth surface side opening 3410 and a sixth surface side opening 3420. Here, an area of the fifth surface side opening 3410 and an area of the sixth surface side opening 3420 may be different.

[0218] Referring to FIG. 19, a cross-sectional shape of the through-hole 3400 may be trapezoidal. For example, a cross-section of the through-hole 3400 intersecting the y-direction may have a shape that widens from the fifth surface S5 toward the sixth surface S6 of the laminate 3100.

[0219] The laminate 3100 may include an upper protective layer 3160, a lower protective layer 3170, and the margin portions 3180, 3181, and 3183.

[0220] The remaining components except for the above is the same as or corresponds to the components of the all-solid-state battery shown in FIG. 11, and a redundant description thereof will be omitted.

[0221] FIG. 21 is a cross-sectional view schematically showing a ring-shaped wearable electronic device on which an all-solid-state battery according to an embodiment is mounted, and FIG. 22 is a top plan view of FIG. 21.

[0222] Referring to FIG. 21 and FIG. 22, an all-solid-state battery 1000 may be mounted inside a ring-shaped wearable electronic device 5000.

[0223] The ring-shaped wearable device 5000 may include a through-hole 5100 disposed in a central portion and a tapered portion 5200 surrounding the through-hole 5100. Since the shape of the all-solid-state battery 1000 corresponds to the shape of the ring-shaped wearable device 5000, the all-solid-state battery 1000 may be mounted in the ring-shaped wearable electronic device 5000, without wasting space.

[0224] 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.

[0225] <Description of symbols>

[0226] 1000, 2000: all-solid-state battery

[0227] 100, 1100: laminate

[0228] 110, 1110: solid electrolyte layer

[0229] 130, 1130: positive electrode layer

[0230] 150, 1150: negative electrode layer

[0231] 160, 1160: upper protective layer

[0232] 170, 1170: lower protective layer

[0233] 180, 1180: margin portion

[0234] 200, 1200: first external electrode

[0235] 300, 1300: second external electrode

[0236] 400, 1400: through-hole

[0237] 500: straight portion

[0238] 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 in 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 in the first direction, andwherein a cross-sectional shape of the laminate is trapezoidal.2.The all-solid-state battery of claim 1, wherein a cross-section of the laminate intersects the positive electrode layer, the solid electrolyte layer, and the negative electrode layer.3.The all-solid-state battery of claim 1, wherein:the laminate comprises a first surface and a second surface disposed opposite each other in the first direction; andan area of the first surface and an area of the second surface are different.4.The all-solid-state battery of claim 1, wherein:the through-hole comprises a first opening and a second opening disposed opposite each other in the first direction; andan area of the first opening and an area of the second opening are substantially the same.5.The all-solid-state battery of claim 4, wherein the through-hole has a cylindrical shape.6.The all-solid-state battery of claim 1, wherein:the through-hole comprises a first opening and a second opening disposed opposite each other in the first direction; andan area of the first opening and an area of the second opening are different.7.The all-solid-state battery of claim 6, wherein the through-hole has a conical frustum shape.8.The all-solid-state battery of claim 1, wherein, when viewed in the first direction, an outer circumference of the laminate comprises a curved portion.9.The all-solid-state battery of claim 8, wherein, when viewed in the first direction, the through-hole is circular, and the outer circumference of the laminate is circular.10.The all-solid-state battery of claim 9, wherein a center of the through-hole and a center of the outer circumference of the laminate are positioned at substantially the same location.11.The all-solid-state battery of claim 8, wherein, when viewed in the first direction, the through-hole is circular, and a radius of the through-hole is substantially the same as a radius of curvature of the curved portion.12.The all-solid-state battery of claim 8, 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.The all-solid-state battery of claim 8, wherein, when viewed in the first direction, the outer circumference of the laminate further comprises a straight portion connected to the curved portion.14.The all-solid-state battery of claim 13, wherein the straight portion comprises:a first straight portion and a second straight portion that are disposed opposite each other in a second direction intersecting the first direction; anda third straight portion and a fourth straight portion that are disposed opposite each other in a third direction intersecting the first direction and the second direction.15.The all-solid-state battery of claim 14, wherein:the first straight portion and the second straight portion have substantially the same length; andthe third straight portion and the fourth straight portion have substantially the same length.16.The all-solid-state battery of claim 15, wherein the first straight portion, the second straight portion, the third straight portion and the fourth straight portion all have substantially the same length.17.The all-solid-state battery of claim 14, 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.18.The all-solid-state battery of claim 13, wherein, when viewed in the first direction, the through-hole is circular, and a radius of the through-hole is substantially the same as a radius of curvature of the curved portion.19.The all-solid-state battery of claim 13, 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.20.The all-solid-state battery of claim 1, further comprising:an outer margin portion disposed on an outer side of the positive electrode layer or the negative electrode layer in a second direction intersecting the first direction and disposed between the solid electrolyte layer and an adjacent solid electrolyte layer in the first direction; andan inner margin portion disposed between the through-hole and inner ends of the positive electrode layer and the negative electrode layer in the second direction,wherein the outer margin portion is further disposed between the positive electrode layer or the negative electrode layer and outer surfaces of the laminate in a third direction intersecting the first direction and the second direction, andthe inner margin portion surrounds the through-hole to separate the laminate from the through-hole.

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