All-solid-state battery

Abstract

An all-solid-state battery may include a laminate including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer, a first fired electrode disposed outside of the laminate and connected to the positive electrode layer, a second fired electrode disposed outside of the laminate and connected to the negative electrode layer, a first metal plate electrode connected to the first fired electrode, and a second metal plate electrode connected to the second fired electrode.

Description

ALL-SOLID-STATE BATTERY

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

[0002] Recently, as portable electronic devices are required to be down-sized and used for a long term, high-capacity batteries are required, and safety of batteries is required due to the popularization of wearable electronic devices.

[0003] 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.

[0004] All-solid-state batteries may expand as the volume of the electrode active material layer changes during charge and discharge. Inside the expanded all-solid-state battery, an electrode may be damaged or the bonding of an electrode-solid electrolyte interface may be damaged, resulting in poor contact, which may deteriorate battery characteristics. Furthermore, cracks may be generated in the all-solid-state battery due to a difference in expansion rate between the electrode and the solid electrolyte, causing moisture infiltration.

[0005] The present disclosure attempts to provide an all-solid-state battery capable of suppressing expansion.

[0006] The present disclosure attempts to provide an all-solid-state battery capable of preventing moisture inflow.

[0007] 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.

[0008] An all-solid-state battery may include a laminate including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer, a first fired electrode disposed outside of the laminate and connected to the positive electrode layer, a second fired electrode disposed outside of the laminate and connected to the negative electrode layer, a first metal plate electrode connected to the first fired electrode, and a second metal plate electrode connected to the second fired electrode.

[0009] An all-solid-state battery may further include an insulation material that may cover an outer surface of the laminate between the first metal plate electrode and the second metal plate electrode and is in contact with the first fired electrode and the second fired electrode.

[0010] The insulation material may include an aluminum oxide (Al2O3) or an epoxy molding compound (EMC).

[0011] The laminate may include a first surface and a second surface opposing each other in a first direction, a third surface and a fourth surface opposing each other in a second direction crossing the first direction, a fifth surface and a sixth surface opposing each other in a third direction simultaneously crossing the first direction and the second direction, the first fired electrode may cover the first surface, and the second fired electrode may cover the second surface.

[0012] An area of the first metal plate electrode may be larger than an area of the first surface, and an area of the second metal plate electrode may be larger than an area of the second surface.

[0013] An area of the first fired electrode may be substantially same as the area of the first surface, and an area of the second fired electrode may be substantially same as the area of the second surface.

[0014] The first fired electrode may extend from the first surface to cover a portion of the fifth surface and a portion of the sixth surface, and the second fired electrode may extend from the second surface to cover a portion of the fifth surface and a portion of the sixth surface.

[0015] An area of the first metal plate electrode may be substantially same as an area of the first fired electrode, and an area of the second metal plate electrode may be substantially same as an area of the second fired electrode.

[0016] An all-solid-state battery may further include an insulation material that may cover the fifth surface and the sixth surface between the first fired electrode and the second fired electrode.

[0017] The first metal plate electrode may cover at least a portion of the one end of the first fired electrode disposed on the fifth surface and the sixth surface, and the second metal plate electrode may cover at least a portion of the one end of the second fired electrode disposed on the fifth surface and the sixth surface.

[0018] An all-solid-state battery may further include an insulation material that may cover the fifth surface and the sixth surface between the first metal plate electrode and the second metal plate electrode and is in contact with the first fired electrode and the second fired electrode.

[0019] The first fired electrode may include one end extending from the first surface to cover a portion of the fifth surface and another end protruding beyond the sixth surface, and the second fired electrode may include one end extending from the second surface to cover a portion of the fifth surface and another end protruding beyond the sixth surface.

[0020] An all-solid-state battery may further include an insulation material that may cover the fifth surface between the first fired electrode and the second fired electrode.

[0021] An area of the first metal plate electrode may be substantially same as an area of the first fired electrode, and an area of the second metal plate electrode may be substantially same as an area of the second fired electrode.

[0022] The first metal plate electrode may cover at least a portion of the one end of the first fired electrode disposed on the fifth surface, and the second metal plate electrode may cover at least a portion of the one end of the second fired electrode disposed on the fifth surface.

[0023] Opposite end portions of the insulation material may be in contact with the first metal plate electrode and the second metal plate electrode on the one end of the first fired electrode disposed on the fifth surface and the one end of the second fired electrode on the fifth surface, respectively.

[0024] The other end of the first fired electrode protruding beyond the sixth surface and the other end of the second fired electrode protruding beyond the sixth surface may not overlap the sixth surface.

[0025] Each of the first metal plate electrode and the second metal plate electrode may include aluminum (Al), iron (Fe), copper (Cu), gold (Au), nickel (Ni) or a combination thereof.

[0026] Each of the first fired electrode and the second fired electrode may include silver (Ag) or copper (Cu).

[0027] According to the all-solid-state battery according to the embodiment, expansion during charging and discharging of the all-solid-state battery can be suppressed.

[0028] According to the all-solid-state battery according to the embodiment, the inflow of moisture can be prevented.

[0029] FIG. 1 is a perspective view schematically illustrating an all-solid-state battery according to an embodiment.

[0030] FIG. 2 is a perspective view schematically showing the laminate of FIG. 1.

[0031] FIG. 3 is a cross-sectional view taken along line III-III' of FIG. 1.

[0032] FIG. 4 is a partial cross-sectional view schematically showing a positive electrode layer of the all-solid-state battery of FIG. 1.

[0033] FIG. 5 is a partial cross-sectional view schematically showing a negative electrode layer of the all-solid-state battery of FIG. 1.

[0034] FIG. 6 is a high-magnification optical microscope photo showing a surface of a metal plate electrode of the all-solid-state battery of FIG. 1.

[0035] FIG. 7 is a high-magnification optical microscope photo showing a surface of a plated electrode of an all-solid-state battery according to the Comparative Example.

[0036] FIG. 8 is a schematic cross-sectional view showing an all-solid-state battery according to another embodiment.

[0037] FIG. 9 is a schematic cross-sectional view showing an all-solid-state battery according to another embodiment.

[0038] FIG. 10 is a schematic cross-sectional view showing an all-solid-state battery according to another embodiment.

[0039] FIG. 11 is a schematic cross-sectional view showing an all-solid-state battery according to another embodiment.

[0040] FIG. 12 is a schematic cross-sectional view showing an all-solid-state battery according to another embodiment.

[0041] FIG. 13 is a schematic cross-sectional view showing an all-solid-state battery according to another embodiment.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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 the laminate in FIG. 1, FIG. 3 is a cross-sectional view taken along line III-III' of FIG. 1, FIG. 4 is a partial cross-sectional view schematically showing a positive electrode layer of the all-solid-state battery of FIG. 1, and FIG. 5 is a partial cross-sectional view schematically showing a negative electrode layer of the all-solid-state battery of FIG. 1.

[0050] Referring to FIG. 1, FIG. 2, FIG. 3, FIG. 4 and FIG. 5, an all-solid-state battery 1000 according to the present embodiment may include a laminate 100, a first fired electrode 210, a second fired electrode 220, a first metal plate electrode 300, a second metal plate electrode 400, and an insulation material 500.

[0051] First, as for directions defined for describing the present embodiment, L-axis, W-axis, and T-axis shown in the drawings indicates axes indicating a length direction, a width direction, and a thickness direction of the all-solid-state battery 1000, respectively.

[0052] The thickness direction (T-axis direction) may be a direction perpendicular to a wide surface (major surface) of sheet-like constituent elements. For example, the thickness direction (T-axis direction) may be used as the same concept as a direction in which components of the laminate 100 are stacked.

[0053] The length direction (L-axis direction) is a direction parallel to the wide surfaces (main surfaces) of the sheet-like components, and may be a direction that intersects (or is orthogonal to) the thickness direction (T-axis direction). For example, the length direction (L-axis direction) may be a direction in which the first metal plate electrode 300 and the second metal plate electrode 400 face each other.

[0054] The width direction (W-axis direction) is a direction parallel to the wide surface (main surface) of the sheet-like components, and may be a direction that simultaneously intersects (or crosses) the thickness direction (T-axis direction) and the length direction (L-axis direction).

[0055] The laminate 100 may have a substantially hexahedral shape, but the present embodiment is not limited thereto. Due to shrinkage during sintering, the laminate 100 may not have a complete hexahedral shape, but may have a substantially hexahedral shape. For example, the laminate 100 has a substantially rectangular hexahedral shape, but edge or vertex portions may have a round shape.

[0056] In the present embodiment, for convenience of description, surfaces opposing each other in the length direction (L-axis direction) may be defined as a first surface S1 and a second surface S2, surfaces opposing each other in the width direction (W-axis direction) and connecting the first surface S1 and the second surface S2 may be defined as a third surface S3 and a fourth surface S4, and surfaces opposing each other in the thickness direction (T-axis direction) and connecting the first surface S1 and the second surface S2 may be defined as a fifth surface S5 and a sixth surface S6.

[0057] Therefore, a first direction, which is a direction in which the first surface S1 and the second surface S2 oppose each other, may be the length direction (L-axis direction), and a second direction and a third direction that are perpendicular to the first direction and perpendicular to each other may be the thickness direction (T-axis direction) and the width direction (W-axis direction), respectively, or the width direction (W-axis direction) and the thickness direction (T-axis direction), respectively.

[0058] A length of the laminate 100 may mean, based on an optical microscope or scanning electron microscope (SEM) photograph of a cross-section in the length direction (L-axis direction)-the thickness direction (T-axis direction) at a center of the laminate 100 in the width direction (W-axis direction), a maximum value of lengths of a plurality of line segments that connect two outermost boundary lines facing each other in the length direction (L-axis direction) of the laminate 100 shown in the above cross-sectional photograph and are parallel to the length direction (L-axis direction). Meanwhile, the length of the laminate 100 may mean a minimum value of lengths of a plurality of line segments that connect two outermost boundary lines facing each other in the length direction (L-axis direction) of the laminate 100 shown in the above cross-sectional photograph and are parallel to the length direction (L-axis direction). On the other hand, the length of the laminate 100 may mean an arithmetic average value of lengths of at least two of a plurality of line segments that connect two outermost boundary lines facing each other in the length direction (L-axis direction) of the laminate 100 shown in the above cross-sectional photograph and are parallel to the length direction (L-axis direction).

[0059] A thickness of the laminate 100 may mean, based on an optical microscope or scanning electron microscope (microscope SEM) photograph of a cross-section in the length direction (L-axis direction)-the thickness direction (T-axis direction) at a center of the laminate 100 in the width direction (W-axis direction), a maximum value of lengths of a plurality of line segments that connect two outermost boundary lines facing each other in the thickness direction (T-axis direction) of the laminate 100 shown in the above cross-sectional photograph and are parallel to the thickness direction (T-axis direction). Meanwhile, the thickness of the laminate 100 may mean a minimum value of lengths of a plurality of line segments that connect two outermost boundary lines facing each other in the thickness direction (T-axis direction) of the laminate 100 shown in the above cross-sectional photograph and are parallel to the thickness direction (T-axis direction). On the other hand, the thickness of the laminate 100 may mean an arithmetic average value of lengths of at least two of a plurality of line segments that connect two outermost boundary lines facing each other in the thickness direction (T-axis direction) of the laminate 100 shown in the above cross-sectional photograph and are parallel to the thickness direction (T-axis direction).

[0060] A width of the laminate 100 may mean, based on an optical microscope or scanning electron microscope (microscope SEM) photograph of a cross-section in the length direction (L-axis direction)-the width direction (W-axis direction) at a center of the laminate 100 in the thickness direction (T-axis direction), a maximum value of lengths of a plurality of line segments that connect two outermost boundary lines facing each other in the width direction (W-axis direction) of the laminate 100 shown in the above cross-sectional photograph and are parallel to the width direction (W-axis direction). Meanwhile, the width of the laminate 100 may mean a minimum value of lengths of a plurality of line segments that connect two outermost boundary lines facing each other in the width direction (W-axis direction) of the laminate 100 shown in the above cross-sectional photograph and are parallel to the width direction (W-axis direction). On the other hand, the width of the laminate 100 may mean an arithmetic average value of lengths of at least two of a plurality of line segments that connect two outermost boundary lines facing each other in the width direction (W-axis direction) of the laminate 100 shown in the above cross-sectional photograph and are parallel to the width direction (W-axis direction).

[0061] The laminate 100 may include solid electrolyte layers 110, positive electrode layers 130, negative electrode layers 150, an upper protective layer 160, a lower protective layer 170, and margin portions 180.

[0062] The solid electrolyte layer 110, the positive electrode layer 130, and the negative electrode layer 150 may each be plural. The positive electrode layer 130 and the negative electrode layer 150 may be alternately stacked in the thickness direction (T-axis direction) with the solid electrolyte layer 110 interposed therebetween. Such a laminated structure may repeat within the laminate 100, and the electrode layer closest to the fifth surface S5 of the laminate 100 may be a positive electrode layer 130 or a negative electrode layer 150, and the electrode layer closest to the sixth surface S6 may be a negative electrode layer 150 or a positive electrode layer 130.

[0063] 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.

[0064] The solid electrolyte layer 110 includes a solid electrolyte. The solid electrolyte may serve as a passage for lithium (Li) ions.

[0065] The solid electrolyte included in the solid electrolyte layer 110 may include a glass-ceramic electrolyte including lithium halide (LiX, where X is a halogen element such as F, Br, Cl, I, or the like). The glass-ceramic (or a 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, or the like. Therefore, the glass-ceramic-based electrolyte is an electrolyte that has undergone partial crystallization through sintering and in which amorphous and crystalline materials are mixed.

[0066] The glass-ceramic-based electrolyte may be a mixture of an amorphous material and two or more types of crystalline materials. Further, the crystalline materials which are contained in the glass-ceramic-based electrolyte may include a lithium-compound crystalline phase containing lithium.

[0067] When the glass-ceramic-based electrolyte is contained in the solid electrolyte layer, sufficient densification is achieved after sintering, whereby it is possible to realize high ionic conductivity.

[0068] The glass-ceramic electrolyte may include at least one selected from the group consisting of 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). As a specific example, the glass-ceramic-based electrolyte may include Li2O-B2O3-SiO2-P2O5-GeO2-LiCl.

[0069] Alternatively, the solid electrolyte contained in the solid electrolyte layer 110 may include a lithium-borosilicate-based electrolyte (hereinafter, also referred to as an 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 X-ray diffraction, electron beam diffraction, etc.

[0070] When the LBSO-based electrolyte is contained in the solid electrolyte layer 110, it is possible to keep the amorphous state during sintering while lowering the sintering temperature. Therefore, 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).

[0071] Alternatively, the solid electrolyte contained 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.

[0072] In the region where the margin portion 180, to be described later, is disposed, a material having a low ionic conductivity and electrical conductivity, i.e., an insulating material, may be present, or a material having ionic conductivity (or electrical conductivity) similar to the ionic conductivity (or electrical conductivity) of the solid electrolyte may be present. For example, if a material is present in the region that has an ionic conductivity (or electrical conductivity) similar to the ionic conductivity (or electrical conductivity) of the solid electrolyte, the material may be a material identical to or different from the solid electrolyte in other regions. As 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 region.

[0073] 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 and 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) LiZr2(PO4)3.

[0074] 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, 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, Li2S-GeS2, etc.

[0075] Further, the Perovskite-type solid electrolyte may refer to lithium-lanthanum-titanium-oxide (LLTO) represented by Li3xLa2 / 3-x□1 / 3-2xTiO3(wherein 0<x<0.16, □ is vacancy), such as Li1 / 8La5 / 8TiO3, and the LiPON-type solid electrolyte may refer to nitride such as lithium phosphorous oxynitride such as Li2.8PO3.3N0.46.

[0076] The positive electrode layer 130 may be exposed outside of the laminate 100 from the first surface S1 of the laminate 100, and may be connected to the first fired electrode 210.

[0077] With reference to FIGS. 3 and 4, 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.

[0078] 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.

[0079] The positive electrode current collector 133 may include a first surface 133a and a second surface 133b. The first surface 133a and the second surface 133b oppose each other in the thickness direction (T-axis direction).

[0080] The positive electrode current collector 133 may include, for example, a porous metal plate made of stainless steel, nickel (Ni), copper (Cu), tin (Sn), aluminum (Al), or an alloy thereof, but is not limited thereto.

[0081] In addition, the positive electrode current collector 133 may be coated with an oxidation-resistant metal or alloy film to prevent oxidation.

[0082] 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, and the conductive carbon material may include, for example, graphite, conductive fiber such as carbon nanotube (CNT) or vapor grown carbon fiber (VGCF), or conductive carbon such as carbon black.

[0083] Meanwhile, the positive electrode current collector may also include one or more types of solid electrolytes.

[0084] The first positive electrode active material layer 135 and the second positive electrode active material layer 136 may include positive electrode active materials, and may be disposed on a surface of the positive electrode current collector 133. The first positive electrode active material layer 135 and the second positive electrode active material layer 136 may be formed by printing a positive electrode active material on one or both surfaces of the positive electrode current collector 133. However, the method for forming the positive electrode active material layer is not limited thereto.

[0085] The positive electrode 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. That is, 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 being charged. The positive active material may affect the capacity and output of the all-solid-state battery.

[0086] For example, the positive electrode active material may include at least one selected from the group consisting of compounds represented by the following chemical formulae: LiaAl-bMbD2(wherein 0.90≤a≤1.8 and 0≤b≤0.5); LiaEl-bMbO2-cDc(wherein 0.90≤a≤1.8, 0≤b≤0.5, and 0≤c≤0.05); LiE2-bMbO4-cDc(wherein 0≤b≤0.5 　and 0≤c≤0.05); LiaNi1-b-cCobMcDα(wherein 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05, and 0<α≤2); LiaNi1-b-cCobMcO2-αXα(wherein 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05, and 0<α<2); LiaNi1-b-cCobMcO2-αX2(wherein 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05, and 0<α<2); LiaNi1-b-cMnbMcDα(wherein 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05, and 0<α≤2); LiaNi1-b-cMnbMcO2-αXα(wherein 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05, and 0<α<2); LiaNi1-b-cMnbMcO2-αX2(wherein 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05, and 0<α<2); LiaNibEcGdO2(wherein 0.90≤a≤1.8, 0≤b≤0.9, 0≤c≤0.5, and 0.001≤d≤0.1); LiaNibCocMndGeO2(wherein 0.90≤a≤1.8, 0≤b≤0.9, 0≤c≤0.5, 0≤d≤0.5, and 0.001≤e≤0.1); LiaNiGbO2(wherein 0.90≤a≤1.8 and 0.001≤b≤0.1); LiaCoGbO2(wherein 0.90≤a≤1.8 and 0.001≤b≤0.1); LiaMnGbO2 (wherein 0.90≤a≤1.8 and 0.001≤b≤0.1); LiaMn2GbO4(wherein 0.90≤a≤1.8 and 0.001≤b≤0.1); QO2; QS2; LiQS2; V2O5; LiV2O2; LiRO2; LiNiVO4; Li(3-f)J2(PO4)3(wherein 0≤f≤2); Li(3-f)Fe2(PO4)3(wherein 0≤f≤2); and LiFePO4. In the above chemical formulas, A represents Ni, Co, or Mn, M represents Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, Nb, Ti, or a rare-earth element, D represents O, F, S, or P, E represents Co or Mn, X represents F, S, or P, G represents Al, Cr, Mn, Fe, Mg, La, Ce, Sr, or V, Q represents Ti, Mo, or Mn, R represents Cr, V, Fe, Sc, or Y, and J represents V, Cr, Mn, Co, Ni, or Cu.

[0087] The positive electrode active material may also include LiCoO2, LiMnxO2x(wherein x is 1 or 2), LiNi1-xMnxO2x(wherein 0<x<1), LiNi1-x-yCoxMnyO2(wherein 0≤x≤0.5 and 0≤y≤0.5), LiFePO4, TiS2, FeS2, TiS3, or FeS3, but the present disclosure is not limited thereto.

[0088] The positive electrode active material may optionally include a conductive material and a binder. However, because an organic material such as a binder decomposes during the sintering process, the organic material may not remain on the positive electrode active material layer of the finally obtained positive electrode current collector.

[0089] The conductive material is not particularly limited as long as it has conductivity without causing a chemical change 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 or potassium titanate; conductive metal oxide such as titanium oxide; and conductive materials such as polyphenylene derivatives, etc. may be used.

[0090] The binder may be used to improve the bonding forces of the active material, the conductive material, and the like. The binder may include, but not limited to, at least one selected from the group consisting of polyvinylidene fluoride, polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, polytetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butadiene rubber (SBR), fluoro-rubber, and various copolymers, etc.

[0091] Meanwhile, the positive electrode layer 130 may further contain a solid electrolyte component. The solid electrolyte component may contain one or more of the aforementioned components, and may serve as an ionic conduction channel in the positive electrode layer. Therefore, it is possible to reduce interface resistance.

[0092] The negative electrode layer 150 may be exposed outside of the laminate 100 from the second surface S2 of the laminate 100, and may be connected to the second fired electrode 220.

[0093] With reference to FIGS. 3 and 5, 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.

[0094] For example, the negative electrode current collector 153 may include a plate-shaped member or a thin member. As another example, the negative electrode current collector 153 may include a porous body having a reticulate shape, a mesh shape, or the like.

[0095] The negative electrode current collector 153 may include a first surface 153a and a second surface 153b. The first surface 153a and the second surface 153b oppose each other in the thickness direction (T-axis direction).

[0096] For example, the negative electrode current collector 153 may include, but not limited to, a porous metal plate made of, for example, stainless steel, nickel (Ni), copper (Cu), tin (Sn), aluminum (Al), or an alloy thereof.

[0097] In addition, the negative electrode current collector 153 may be coated with an oxidation-resistant metal or alloy film to prevent oxidation.

[0098] The negative electrode current collector 153, like the positive electrode current collector 133, may include a conductive carbon-based material, and may include 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.

[0099] 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. However, the method of forming the negative electrode active material layer is not limited thereto.

[0100] The negative electrode active material 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.

[0101] The lithium metal alloy may contain lithium, and metal / metalloid capable of making an alloy with lithium. For example, the metal / metalloid capable of making an alloy with lithium may be Si, Sn, Al, Ge, Pb, Bi, Sb, Si-AM alloys (wherein AM is an alkali metal, an alkaline earth metal, an element in group 13 to group 16, a transition metal, a rare-earth element, or a combination thereof, and does not include Si), Sn-AM alloys (wherein AM is an alkaline metal, an alkaline earth metal, an element in group 13 to group 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.

[0102] 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.

[0103] In addition, the oxide of the metal / metalloid capable of making 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 contain one or more elements selected from a group consisting of the elements in group 13 to group 16 of the periodic table of elements. For example, the negative electrode active material may contain one or more elements selected from a group consisting of Si, Ge, and Sn.

[0104] 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, or the like.

[0105] 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 alloys, 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.

[0106] The negative active material may optionally include a conductive material and a binder.

[0107] The conductive material is not particularly limited as long as it has conductivity without causing a chemical change 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 or potassium titanate; conductive metal oxide such as titanium oxide; or conductive materials such as polyphenylene derivatives, etc. may be used.

[0108] The binder may be used to improve the bonding forces of the active material, the conductive material, and the like. The binder may include, but not limited to, at least one selected from the group consisting of polyvinylidene fluoride, polyvinyl alcohol, carboxymethylcellulose (CMC), starch, hydroxypropylcellulose, regenerated cellulose, polyvinylpyrrolidone, polytetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butadiene rubber (SBR), fluoro-rubber, and various copolymers, etc.

[0109] Meanwhile, the negative electrode layer 150 may further contain a solid electrolyte component. The solid electrolyte component may contain one or more of the aforementioned components, and may serve as an ionic conduction channel in the negative electrode layer. Therefore, it is possible to reduce interface resistance.

[0110] The upper protective layer 160 and the lower protective layer 170 may be outermost layers respectively disposed on the fifth surface S5 and the sixth surface S6 of the laminate 100. That is, the upper protective layer 160 may be the outermost layer disposed on the fifth surface S5 of the laminate 100, and the lower protective layer 170 may be the outermost layer disposed on the sixth surface S6 of the laminate 100. The upper protective layer 160 and the lower protective layer 170 may improve reliability of moisture resistance by preventing moisture penetration and prevent damage caused by physical and chemical stress.

[0111] The upper protective layer 160 and the lower protective layer 170 may be insulation layers including an insulating material, i.e., a material that is not electrically (ionically) conductive.

[0112] The upper protective layer 160 and the lower protective layer 170 may include, but not limited to, at least one selected from the group consisting of ceramic materials, e.g., alumina (Al2O3), aluminum nitride (AlN), beryllium oxide (BeO), boron nitride (BN), silicon (Si), silicon carbide (SiC), silica (SiO2), silicon nitride (Si3N4), gallium arsenide (GaAs), gallium nitride (GaN), barium titanate (BaTiO3), zirconium dioxide (ZrO2), mixtures thereof, oxides thereof and / or nitrides thereof, and any other suitable ceramic material. In addition, the upper protective layer 160 and the lower protective layer 170 may optionally include the above-mentioned solid electrolyte and may include one or more types of solid electrolytes. However, the present disclosure is not limited thereto.

[0113] For example, the margin portion 180 may be disposed on the solid electrolyte layer 110 in a region excluding the region where the positive electrode layer 130 or the negative electrode layer 150 is disposed. If the positive electrode layer 130 is disposed on the solid electrolyte layer 110, the margin portion 180 may be disposed in an area excluding the area where the positive electrode layer 130 is disposed. Similarly, if the negative electrode layer 150 is disposed on the solid electrolyte layer 110, the margin portion 180 may be disposed in the region excluding the region where the negative electrode layer 150 is disposed.

[0114] With reference to FIG. 3, 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. For example, the first margin portion 181 may comprise a portion of the second surface S2 of the laminate 100, and the second margin portion 183 may comprise a portion of the first surface S1 of the laminate 100. On the other hand, although not shown in the drawings, the margin portion 180 may comprise a portion of the third surface S3 and a portion of the fourth surface S4 of the laminate 100.

[0115] 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.

[0116] 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 an electrolyte material, and may include a material with an ionic conductivity of 1.0x10-10S / cm or less.

[0117] The margin portion 180 may include an insulating material, i.e., a material that does not have electrically (ionically) conductive.

[0118] The margin portion 180 may include, but not limited to, at least one selected from the group consisting of ceramic materials, e.g., alumina (Al2O3), aluminum nitride (AlN), beryllium oxide (BeO), boron nitride (BN), silicon (Si), silicon carbide (SiC), silica (SiO2), silicon nitride (Si3N4), gallium arsenide (GaAs), gallium nitride (GaN), barium titanate (BaTiO3), zirconium dioxide (ZrO2), mixtures thereof, oxides thereof and / or nitrides thereof, or any other suitable ceramic material.

[0119] Meanwhile, the margin portion 180 may include a solid electrolyte that is identical to or different from the solid electrolyte included in the above-described solid electrolyte layer, and may include one or more types of solid electrolytes. However, the present disclosure is not limited thereto.

[0120] In addition, in the margin portion 180, a material having a low ionic conductivity and electrical conductivity, i.e., an insulating material, may be present, and a material having ionic conductivity (or electrical conductivity) similar to the ionic conductivity (or electrical conductivity) of the solid electrolyte may be present.　 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, that material may be a material identical to or different from the solid electrolyte in other regions.　 As 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.

[0121] The first fired electrode 210 and the second fired electrode 220 may be disposed outside of the laminate 100.

[0122] The first fired electrode 210 is connected to the positive electrode layer 130 and the solid electrolyte layer 110 on the first surface S1 of the laminate 100.

[0123] For example, the first fired electrode 210 may cover the first surface S1 of the laminate 100, and an area of the first fired electrode 210 may be substantially same as an area of the first surface S1 of the laminate 100. Here, the area of the first fired electrode 210 may mean the area of the main surface.

[0124] As used herein, the expression “substantially same” may refer to two areas compared to each other being the same, 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.

[0125] In addition, an edge of the main surface of the first fired electrode 210 may be in close contact with an edge of the first surface S1 of the laminate 100. Here, the two opposite edges along the thickness direction (T-axis direction) of the first fired electrode 210 may be flush with the fifth surface S5 and the sixth surface S6 of the laminate 100, respectively, and the two opposite edges along the width direction (W-axis direction) of the first fired electrode 210 may be flush with the third surface S3 and the fourth surface S4 of the laminate 100, respectively.

[0126] The first fired electrode 210 may be formed by baking a conductive paste. The conductive paste may include, for example, a conductive metal, such as silver (Ag) or copper (Cu), and glass.

[0127] The second fired electrode 220 may be connected to the negative electrode layer 150 and the solid electrolyte layer 110 on the second surface S2 of the laminate 100.

[0128] For example, the second fired electrode 220 may cover the second surface S2 of the laminate 100, and an area of the second fired electrode 220 may be substantially same as an area of the second surface S2 of the laminate 100. Here, the area of the second fired electrode 220 may mean the area of the main surface.

[0129] In addition, an edge of the main surface of the second fired electrode 220 may be in close contact with an edge of the second surface S2 of the laminate 100. Here, the two opposite edges along the thickness direction (T-axis direction) of the second fired electrode 220 may be flush with the fifth surface S5 and the sixth surface S6 of the laminate 100, respectively, and the two opposite edges along the width direction (W-axis direction) may be flush with the third surface S3 and the fourth surface S4 of the laminate 100, respectively.

[0130] The second fired electrode 220 may be formed by baking a conductive paste. The conductive paste may include, for example, a conductive metal, such as silver (Ag) or copper (Cu), and glass.

[0131] For example, the first surface S1 and the second surface S2 of the laminate 100 may be dipped into the conductive paste and then blotted to form the first fired electrode 210 and the second fired electrode 220. As another example, a conductive paste may be applied to the first surface S1 and the second surface S2 of the laminate 100, to form the first fired electrode 210 and the second fired electrode 220. 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 fired electrode 210 and the second fired electrode 220, but the forming method of the first fired electrode 210 and the second fired electrode 220 is not limited to the above-described method. The conductive metal included in the conductive paste may include, for example, 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.

[0132] The first metal plate electrode 300 and the second metal plate electrode 400 may be disposed outside of the laminate 100.

[0133] The first metal plate electrode 300 and the second metal plate electrode 400 may be formed by processing a metal plate or by bonding metal plates, but the present embodiment is not limited thereto. The thickness of the metal plate may be, for example, 1.0 mm or more and 1.5 mm or less, but the present embodiment is not limited thereto.

[0134] The first metal plate electrode 300 and the second metal plate electrode 400 may include, for example, aluminum (Al), iron (Fe), copper (Cu), gold (Au), nickel (Ni) or a combination thereof, but the present embodiment is not limited thereto.

[0135] The first metal plate electrode 300 may be connected to the first fired electrode 210.

[0136] For example, a conductive paste is applied to the first surface S1 of the laminate 100, and the first metal plate electrode 300 may be attached to the conductive paste when the conductive paste is in an uncured or semi-cured state. Then, by heat treating and baking the conductive paste at 180 °C, the first metal plate electrode 300 may be tightly connected to the laminate 100 through the first fired electrode 210.

[0137] Therefore, the first fired electrode 210 may be disposed on the first surface S1 of the laminate 100, and the first metal plate electrode 300 may be disposed on the first fired electrode 210.

[0138] An area of the first metal plate electrode 300 may be larger than the area of the first surface S1 of the laminate 100. Here, the area of the first metal plate electrode 300 may mean the area of the main surface.

[0139] Therefore, each edge of the first metal plate electrode 300 may be disposed to extend beyond the edge of the first surface S1 of the laminate 100. Here, the two opposite edges along the thickness direction (T-axis direction) of the first metal plate electrode 300 may protrude beyond the fifth surface S5 and the sixth surface S6 of the laminate 100, and the two opposite edges along the width direction (W-axis direction) of the first metal plate electrode 300 may protrude beyond the third surface S3 and the fourth surface S4 of the laminate 100.

[0140] The second metal plate electrode 400 may be connected to the second fired electrode 220.

[0141] For example, a conductive paste is applied to the second surface S2 of the laminate 100, and the second metal plate electrode 400 may be attached to the conductive paste when the conductive paste is in an uncured or semi-cured state. Then, by heat treating and baking the conductive paste at 180 °C, the second metal plate electrode 400 may be tightly connected to the laminate 100 through the second fired electrode 220.

[0142] Therefore, the second fired electrode 220 may be disposed on the second surface S2 of the laminate 100, and the second metal plate electrode 400 may be disposed on the second fired electrode 220.

[0143] An area of the second metal plate electrode 400 may be larger than the area of the second surface S2 of the laminate 100. Here, the area of the second metal plate electrode 400 may mean the area of the main surface.

[0144] Therefore, each edge of the second metal plate electrode 400 may be disposed to extend beyond the edge of the second surface S2 of the laminate 100. Here, the two opposite edges along the thickness direction (T-axis direction) of the second metal plate electrode 400 may protrude beyond the fifth surface S5 and the sixth surface S6 of the laminate 100, and the two opposite edges along the width direction (W-axis direction) of the second metal plate electrode 400 may protrude beyond the third surface S3 and the fourth surface S4 of the laminate 100.

[0145] FIG. 6 is a high-magnification optical microscope photo showing a surface of a metal plate electrode of the all-solid-state battery of FIG. 1, and FIG. 7 is a high-magnification optical microscope photo showing a surface of a plated electrode of an all-solid-state battery according to the Comparative Example.

[0146] Referring to FIG. 6, no clear grains are observed on the surface of the metal plate electrode. This is because the metal plate, which is the material of the metal plate electrode, is formed by injection, stretching, casting, etc.

[0147] On the other hand, referring to FIG. 7, grains are observed on the surface of the plated electrode. This is because grains grow during the plating process.

[0148] Thus, a surface of a metal plate electrode of an all-solid-state battery according to the present embodiment may be clearly distinguished from the surface of the plated electrode of the all-solid-state battery according to the Comparative Example.

[0149] In the case of forming a plated electrode by plating metal on a fired electrode according to the Comparative Example, it is difficult to form the plated electrode thick enough to have sufficient rigidity. Therefore, according to the Comparative Example, a crack may be generated in the plated electrode, leading to the infiltration of moisture, which may render the normal charging and discharging of the all-solid-state battery impossible.

[0150] On the other hand, according to the present embodiment, the metal plate electrode may be made of, for example, a metal plate, so that the metal plate electrode may have a thickness that provides sufficient rigidity. Therefore, according to the present embodiment, the generation of cracks and the penetration of moisture are prevented in the metal plate electrode, which may allow the all-solid-state battery to maintain normal charging and discharging.

[0151] The insulation material 500 may cover an outer surface of the laminate 100 between the first metal plate electrode 300 and the second metal plate electrode 400, and may be in contact with the first fired electrode 210 and the second fired electrode 220.

[0152] For example, when the first metal plate electrode 300 and the second metal plate electrode 400 protrude beyond the fifth surface S5 of the laminate 100, and the edges of the first fired electrode 210 and the second fired electrode 220 are flush with the fifth surface S5 of the laminate 100, the space formed by the first metal plate electrode 300, the second metal plate electrode 400, the first fired electrode 210, a second fired electrode 220 and the fifth surface S5 of the laminate 100 may be filled with the insulation material 500. In the same way, the insulation material 500 may also be disposed on the sixth surface S6, the third surface S3, the fourth surface S4 of the laminate 100.

[0153] The insulation material 500 may be made of an electrically insulating material to prevent shorts between the first metal plate electrode 300 and the second metal plate electrode 400 and between the first fired electrode 210 and the second fired electrode 220. For example, the insulation material 500 may include aluminum oxide (Al2O3).

[0154] In addition, the insulation material 500 may be made of an elastic and hygroscopic polymeric resin-based encapsulant material, which may prevent volume expansion and moisture penetration of the all-solid-state battery 1000. For example, the insulation material 500 may include an epoxy molding compound (EMC).

[0155] Meanwhile, a thickness of the insulation material 500 may be 0.1 mm or more and 2.0 mm or less. If the thickness of the insulation material is less than 0.1 mm, it is difficult to sufficiently prevent volume expansion and moisture penetration of the all-solid-state battery, and if it exceeds 2.0 mm, the thickness of the all-solid-state battery may become excessively thick.

[0156] FIG. 8 is a schematic cross-sectional view showing an all-solid-state battery according to another embodiment.

[0157] Referring to FIG. 8, an all-solid-state battery 2000 may include the laminate 100, a first fired electrode 1210, a second fired electrode 1220, a first metal plate electrode 1300, a second metal plate electrode 1400, and an insulation material 1500.

[0158] The first fired electrode 1210 may cover the first surface S1 of the laminate 100 and extend from the first surface S1 to cover a portion of the fifth surface S5 and a portion of the sixth surface S6.

[0159] For example, the first fired electrode 1210 may include an end portion 1210a, a first band portion 1210b, and a second band portion 1210c. The end portion 1210a may cover the first surface S1 of the laminate 100, and the first band portion 1210b may extend from the end portion 1210a to cover a portion of the fifth surface S5 of the laminate 100, and the second band portion 1210c may extend from the end portion 1210a to cover a portion of the sixth surface S6 of the laminate 100.

[0160] Meanwhile, the first fired electrode 1210 may cover a portion of the third surface S3 and a portion of the fourth surface S4 of the laminate 100.

[0161] The second fired electrode 1220 may cover the second surface S2 of the laminate 100 and extend from the second surface S2 to cover a portion of the fifth surface S5 and a portion of the sixth surface S6.

[0162] For example, the second fired electrode 1220 may include an end portion 1220a, a first band portion 1220b and a second band portion 1220c. The end portion 1220a may cover the second surface S2 of the laminate 100, and the first band portion 1220b may extend from the end portion 1220a to cover a portion of the fifth surface S5 of the laminate 100, and the second band portion 1220c may extend from the end portion 1220a to cover a portion of the sixth surface S6 of the laminate 100.

[0163] Meanwhile, the second fired electrode 1220 may cover a portion of the third surface S3 and a portion of the fourth surface S4 of the laminate 100.

[0164] The first metal plate electrode 1300 may be connected to the first fired electrode 1210, and the second metal plate electrode 1400 may be connected to the second fired electrode 1220.

[0165] The insulation material 1500 may cover the fifth surface S5 and the sixth surface S6 of the laminate between the first fired electrode 1210 and the second fired electrode 1220.

[0166] For example, the insulation material 1500 may be in contact with the first band portion 1210b of the first fired electrode 1210, the first band portion 1220b of the second fired electrode 1220, and the fifth surface S5 of the laminate 100, at the same time. In addition, the insulation material 1500 may be in contact with the second band portion 1210c of the first fired electrode 1210, the second band portion 1220c of the second fired electrode 1220, and the sixth surface S6 of the laminate 100, at the same time.

[0167] Meanwhile, the insulation material 1500 may cover the third surface S3 and the fourth surface S4 of the laminate 100 between the first fired electrode 1210 and the second fired electrode 1220.

[0168] The other components except for the above are the same as those of the all-solid-state battery shown in FIG. 1, so the repeated description thereof will be omitted.

[0169] FIG. 9 is a schematic cross-sectional view showing an all-solid-state battery according to another embodiment.

[0170] Referring to FIG. 9, an all-solid-state battery 3000 may include the laminate 100, a first fired electrode 2210, a second fired electrode 2220, a first metal plate electrode 2300, a second metal plate electrode 2400, and an insulation material 2500.

[0171] The first fired electrode 2210 may cover the first surface S1 of the laminate 100 and extend from the first surface S1 to cover a portion of the fifth surface S5 and a portion of the sixth surface S6. For example, the first fired electrode 2210 may include an end portion 2210a, a first band portion 2210b and a second band portion 2210c.

[0172] Meanwhile, the first fired electrode 2210 may cover a portion of the third surface S3 and a portion of the fourth surface S4 of the laminate 100.

[0173] The second fired electrode 2220 may cover the second surface S2 of the laminate 100 and extend from the second surface S2 to cover a portion of the fifth surface S5 and a portion of the sixth surface S6.

[0174] For example, the second fired electrode 2220 may include an end portion 2220a, a first band portion 2220b and a second band portion 2220c.

[0175] Meanwhile, the second fired electrode 2220 may cover a portion of the third surface S3 and a portion of the fourth surface S4 of the laminate 100.

[0176] The first metal plate electrode 2300 may be connected to the first fired electrode 2210.

[0177] The first metal plate electrode 2300 may cover the first fired electrode 2210 on the first surface S1 of the laminate 100, and may cover at least a portion of the first fired electrode 2210 on the fifth surface S5 of the laminate 100 and at least a portion of the first fired electrode 2210 on the sixth surface S6.

[0178] For example, the first metal plate electrode 2300 may include an end portion 2300a, a first bent portion 2300b and a second bent portion 2300c. The end portion 2300a may cover the end portion 2210a of the first fired electrode 2210. The first bent portion 2300b may cover at least a portion of the first band portion 2210b of the first fired electrode 2210, and the second bent portion 2300c may cover at least a portion of the second band portion 2210c of the first fired electrode 2210.

[0179] Meanwhile, the first metal plate electrode 2300 may cover at least a portion of the first fired electrode 2210 on the third surface S3 of the laminate 100 and at least a portion of the first fired electrode 2210 on the fourth surface S4.

[0180] The second metal plate electrode 2400 may be connected to the second fired electrode 2220.

[0181] The second metal plate electrode 2400 may cover the second fired electrode 2220 on the second surface S2 of the laminate 100, and may cover at least a portion of the second fired electrode 2220 on the fifth surface S5 of the laminate 100 and at least a portion of the second fired electrode 2220 on the sixth surface S6.

[0182] For example, the second metal plate electrode 2400 may include an end portion 2400a, a first bent portion 2400b and a second bent portion 2400c. The end portion 2400a may cover the end portion 2220a of the second fired electrode 2220. The first bent portion 2400b may cover at least a portion of the first band portion 2220b of the second fired electrode 2220, and the second bent portion 2400c may cover at least a portion of the second band portion 2220c of the second fired electrode 2220.

[0183] Meanwhile, the second metal plate electrode 2400 may cover at least a portion of the second fired electrode 2220 on the third surface S3 of the laminate 100 and at least a portion of the second fired electrode 2220 on the fourth surface S4.

[0184] The insulation material 2500 may cover the fifth surface S5 and the sixth surface S6 of the laminate 100 between the first metal plate electrode 2300 and the second metal plate electrode 2400, and may be in contact with the first fired electrode 2210 and the second fired electrode 2220.

[0185] For example, the insulation material 2500 may be in contact with the first bent portion 2300b of the first metal plate electrode 2300, the first band portion 2210b of the first fired electrode 2210, the first bent portion 2400b of the second metal plate electrode 2400, the first band portion 2220b of the second fired electrode 2220, and the fifth surface S5 of the laminate 100, at the same time. In addition, the insulation material 2500 may be in contact with the second bent portion 2300c of the first metal plate electrode 2300, the second band portion 2210c of the first fired electrode 2210, the second bent portion 2400c of the second metal plate electrode 2400, the second band portion 2220c of the second fired electrode 2220, and the sixth surface S6 of the laminate 100, at the same time.

[0186] Meanwhile, when the first bent portion 2300b of the first metal plate electrode 2300 entirely covers the first band portion 2210b of the first fired electrode 2210, and the first bent portion 2400b of the second metal plate electrode 2400 entirely covers the first band portion 2220b of a second fired electrode 2220, the insulation material 2500 may cover the fifth surface S5 of the laminate 100 between the first metal plate electrode 2300 and the second metal plate electrode 2400 and may not be in contact with the first fired electrode 2210 and the second fired electrode 2220. In addition, when the second bent portion 2300c of the first metal plate electrode 2300 entirely covers the second band portion 2210c of the first fired electrode 2210, and the second bent portion 2400c of the second metal plate electrode 2400 entirely covers the second band portion 2220c of the second fired electrode 2220, it may cover the sixth surface S6 of the laminate 100 and may not be in contact with the first fired electrode 2210 and the second fired electrode 2220.

[0187] On the other hand, the insulation material 2500 may cover the third surface S3 and the fourth surface S4 of the laminate 100 between the first metal plate electrode 2300 and the second metal plate electrode 2400. and may be in contact with the first fired electrode 2210 and the second fired electrode 2220.

[0188] The other components except for the above are the same as those of the all-solid-state battery shown in FIG. 1, so the repeated description thereof will be omitted.

[0189] FIG. 10 is a schematic cross-sectional view showing an all-solid-state battery according to another embodiment.

[0190] Referring to FIG. 10, an all-solid-state battery 4000 may include the laminate 100, a first fired electrode 3210, a second fired electrode 3220, a first metal plate electrode 3300, a second metal plate electrode 3400, and an insulation material 3500.

[0191] The first fired electrode 3210 may cover the first surface S1 of the laminate 100 and extend from the first surface S1 to cover a portion of the fifth surface S5. In addition, the first fired electrode 3210 may extend from the first surface S1 of the laminate 100 to protrude beyond the sixth surface S6.

[0192] For example, the first fired electrode 3210 may include an end portion 3210a, a band portion 3210b and a protruding portion 3210c. The end portion 3210a may cover the first surface S1 of the laminate 100, and the band portion 3210b may extend from the end portion 3210a to cover a portion of the fifth surface S5 of the laminate 100, and the protruding portion 3210c may extend from the end portion 3210a to protrude beyond the sixth surface S6 of the laminate 100.

[0193] Meanwhile, the first fired electrode 3210 may cover a portion of the third surface S3 and a portion of the fourth surface S4 of the laminate 100.

[0194] The second fired electrode 3220 may cover the second surface S2 of the laminate 100 and extend from the second surface S2 to cover a portion of the fifth surface S5. In addition, the second fired electrode 3220 may extend from the first surface S1 of the laminate 100 to protrude beyond the sixth surface S6.

[0195] For example, the second fired electrode 3220 may include an end portion 3220a, a band portion 3220b and a protruding portion 3220c. The end portion 3220a may cover the first surface S1 of the laminate 100, and the band portion 3220b may extend from the end portion 3220a to cover a portion of the fifth surface S5 of the laminate 100, and the protruding portion 3220c may extend from the end portion 3220a to protrude beyond the sixth surface S6 of the laminate 100.

[0196] Meanwhile, the second fired electrode 3220 may cover a portion of the third surface S3 and a portion of the fourth surface S4 of the laminate 100.

[0197] The first metal plate electrode 3300 may be connected to the first fired electrode 3210.

[0198] The first metal plate electrode 3300 may cover the first fired electrode 3210 on the first surface S1 of the laminate 100, and may cover at least a portion of the first fired electrode 3210 on the fifth surface S5 of the laminate 100.

[0199] For example, the first metal plate electrode 3300 may include an end portion 3300a, a bent portion 3300b and a protruding portion 3300c. The end portion 3300a may cover the end portion 3210a of the first fired electrode 3210. The bent portion 3300b may cover at least a portion of the band portion 3210b of the first fired electrode 3210, and the protruding portion 3300c may extend from the end portion 3300a to protrude beyond the sixth surface S6 of the laminate 100.

[0200] The second metal plate electrode 3400 may be connected to the second fired electrode 1220.

[0201] The second metal plate electrode 3400 may cover the second fired electrode 3220 on the first surface S1 of the laminate 100, and may cover at least a portion of the second fired electrode 3220 on the fifth surface S5 of the laminate 100.

[0202] For example, the second metal plate electrode 3400 may include an end portion 3400a, a bent portion 3400b and a protruding portion 3400c. The end portion 3400a may cover the end portion 3220a of the second fired electrode 3220. The bent portion 3400b may cover at least a portion of the band portion 3220b of the second fired electrode 3220, and the protruding portion 3400c may extend from the end portion 3400a to protrude beyond the sixth surface S6 of the laminate 100.

[0203] The insulation material 3500 may cover the fifth surface S5 of the laminate 100 between the first metal plate electrode 3300 and the second metal plate electrode 3400, and may be in contact with the first fired electrode 3210 and the second fired electrode 3220.

[0204] For example, the insulation material 3500 may be in contact with the bent portion 3300b of the first metal plate electrode 3300, the band portion 3210b of the first fired electrode 3210, the bent portion 3400b of the second metal plate electrode 3400, the band portion 3220b of the second fired electrode 3220, and the fifth surface S5 of the laminate 100, at the same time.

[0205] Meanwhile, the insulation material 3500 may cover the sixth surface S6 of the laminate 100 between the first fired electrode 3210 and the second fired electrode 3220.

[0206] For example, the insulation material 3500 may be in contact with the protruding portion 3210c of the first fired electrode 3210, the protruding portion 3220c of the second fired electrode 3220, and the sixth surface S6 of the laminate 100, at the same time.

[0207] Meanwhile, the insulation material 3500 may cover the third surface S3 and the fourth surface S4 of the laminate 100 between the first metal plate electrode 3300 and the second metal plate electrode 3400, and may be in contact with the first fired electrode 3210 and the second fired electrode 3220.

[0208] The other components except for the above are the same as those of the all-solid-state battery shown in FIG. 1, so the repeated description thereof will be omitted.

[0209] FIG. 11 is a schematic cross-sectional view showing an all-solid-state battery according to another embodiment.

[0210] Referring to FIG. 11, an all-solid-state battery 5000 may include the laminate 100, a first fired electrode 4210, a second fired electrode 4220, a first metal plate electrode 4300, a second metal plate electrode 4400, and an insulation material 4500.

[0211] The first fired electrode 4210 may cover the first surface S1 of the laminate 100, and may extend from the first surface S1 to protrude beyond the fifth surface S5. In addition, the first fired electrode 4210 may extend from the first surface S1 of the laminate 100 to cover a portion of the sixth surface S6.

[0212] For example, the first fired electrode 4210 may include an end portion 4210a, a protruding portion 4210b and a band portion 4210c. The end portion 4210a may cover the first surface S1 of the laminate 100, and the protruding portion 4210b may extend from the end portion 4210a to protrude beyond the fifth surface S5 of the laminate 100, and the band portion 4210c may extend from the end portion 4210a to cover a portion of the sixth surface S6 of the laminate 100.

[0213] Meanwhile, the first fired electrode 4210 may cover a portion of the third surface S3 and a portion of the fourth surface S4 of the laminate 100.

[0214] The second fired electrode 4220 may cover the second surface S2 of the laminate 100, and may extend from the second surface S2 to protrude beyond the fifth surface S5. In addition, the second fired electrode 4220 may extend from the second surface S2 of the laminate 100 to cover a portion of the sixth surface S6.

[0215] For example, the second fired electrode 4220 may include an end portion 4220a, a protruding portion 4220b and a band portion 4220c. The end portion 4220a may cover the second surface S2 of the laminate 100, and the protruding portion 4220b may extend from the end portion 4220a to protrude beyond the fifth surface S5 of the laminate 100, and the band portion 4220c may extend from the end portion 4220a to cover a portion of the sixth surface S6 of the laminate 100.

[0216] Meanwhile, the second fired electrode 4220 may cover a portion of the third surface S3 and a portion of the fourth surface S4 of the laminate 100.

[0217] The first metal plate electrode 4300 may be connected to the first fired electrode 4210.

[0218] The first metal plate electrode 4300 may cover the first fired electrode 4210 on the first surface S1 of the laminate 100, and may cover at least a portion of the first fired electrode 4210 on the sixth surface S6 of the laminate 100.

[0219] For example, the first metal plate electrode 4300 may include an end portion 4300a, a protruding portion 4300b and a bent portion 4300c. The end portion 4300a may cover the end portion 4210a of the first fired electrode 4210. The protruding portion 4300b may extend from the end portion 4300a to protrude beyond the fifth surface S5 of the laminate 100, and the bent portion 4300c may cover at least a portion of the band portion 4210c of the first fired electrode 4210.

[0220] The second metal plate electrode 4400 may be connected to the second fired electrode 1220.

[0221] The second metal plate electrode 4400 may cover the second fired electrode 4220 on the first surface S1 of the laminate 100, and may cover at least a portion of the second fired electrode 4220 on the sixth surface S6 of the laminate 100.

[0222] For example, the second metal plate electrode 4400 may include an end portion 4400a, a protruding portion 4400b and a bent portion 4400c. The end portion 4400a may cover the end portion 4210a of the second fired electrode 4220. The protruding portion 4400b may extend from the end portion 4400a to protrude beyond the fifth surface S5 of the laminate 100, and the bent portion 4400c may cover at least a portion of the band portion 4220c of the second fired electrode 4220.

[0223] The insulation material 4500 may cover the fifth surface S5 of the laminate 100 between the first fired electrode 4210 and the second fired electrode 4220.

[0224] For example, the insulation material 4500 may be in contact with the protruding portion 4210b of the first fired electrode 4210, the protruding portion 4220b of the second fired electrode 4220, and the fifth surface S5 of the laminate 100, at the same time.

[0225] Meanwhile, the insulation material 4500 may cover the sixth surface S6 of the laminate 100 between the first metal plate electrode 4300 and the second metal plate electrode 4400, and may be in contact with the first fired electrode 4210 and the second fired electrode 4220.

[0226] For example, the insulation material 4500 may be in contact with the bent portion 4300c of the first metal plate electrode 4300, the band portion 4210c of the first fired electrode 4210, the bent portion 4400c of the second metal plate electrode 4400, the band portion 4220c of the second fired electrode 4220, and the sixth surface S6 of the laminate 100, at the same time.

[0227] Meanwhile, the insulation material 4500 may cover the third surface S3 and the fourth surface S4 of the laminate 100 between the first metal plate electrode 4300 and the second metal plate electrode 4400, and may be in contact with the first fired electrode 4210 and the second fired electrode 4220.

[0228] The other components except for the above are the same as those of the all-solid-state battery shown in FIG. 1, so the repeated description thereof will be omitted.

[0229] FIG. 12 is a schematic cross-sectional view showing an all-solid-state battery according to another embodiment.

[0230] Referring to FIG. 12, an all-solid-state battery 6000 may include the laminate 100, a first fired electrode 5210, a second fired electrode 5220, a first metal plate electrode 5300, a second metal plate electrode 5400, and an insulation material 5500.

[0231] The first fired electrode 5210 may cover the first surface S1 of the laminate 100 and extend from the first surface S1 to cover a portion of the fifth surface S5.

[0232] For example, the first fired electrode 5210 may include an end portion 5210a, a band portion 5210b and a protruding portion 5210c. The end portion 5210a may cover the first surface S1 of the laminate 100, and the band portion 5210b may extend from the end portion 5210a to cover a portion of the fifth surface S5 of the laminate 100, and the protruding portion 5210c may extend from the end portion 5210a to protrude beyond the sixth surface S6 of the laminate 100.

[0233] Meanwhile, the first fired electrode 5210 may cover a portion of the third surface S3 and a portion of the fourth surface S4 of the laminate 100.

[0234] The second fired electrode 5220 may cover the second surface S2 of the laminate 100 and extend from the second surface S2 to cover a portion of the fifth surface S5.

[0235] For example, the second fired electrode 5220 may include an end portion 5220a, a band portion 5220b and a protruding portion 5220c. The end portion 5220a may cover the second surface S2 of the laminate 100, and the band portion 5220b may extend from the end portion 5220a to cover a portion of the fifth surface S5 of the laminate 100, and the protruding portion 5220c may extend from the end portion 5220a to protrude beyond the sixth surface S6 of the laminate 100.

[0236] Meanwhile, the second fired electrode 5220 may cover a portion of the third surface S3 and a portion of the fourth surface S4 of the laminate 100.

[0237] The first metal plate electrode 5300 may be connected to the first fired electrode 5210.

[0238] The first metal plate electrode 5300 may cover the first fired electrode 5210 on the first surface S1 of the laminate 100, and may extend to protrude beyond the fifth surface S5 and the sixth surface S6 of the laminate 100.

[0239] For example, the two opposite edges along the thickness direction (T-axis direction) of the first metal plate electrode 5300 may be flush with the outer edges of the band portion 5210b and the protruding portion 5210c of the first fired electrode 5210 in the thickness direction (T-axis direction), respectively.

[0240] The second metal plate electrode 5400 may be connected to the second fired electrode 1220.

[0241] The second metal plate electrode 5400 may cover the second fired electrode 5220 on the second surface S2 of the laminate 100, and may extend to protrude beyond the fifth surface S5 and the sixth surface S6 of the laminate 100.

[0242] For example, the two opposite edges along the thickness direction (T-axis direction) of the second metal plate electrode 5400 may be flush with the outer edges of the band portion 5220b and the protruding portion 5220c of the second fired electrode 5220 in the thickness direction (T-axis direction), respectively.

[0243] The insulation material 5500 may cover the fifth surface S6 and the sixth surface S6 of the laminate 100 between the first fired electrode 5210 and the second fired electrode 5220.

[0244] For example, the insulation material 5500 may be in contact with the band portion 5210b of the first fired electrode 5210, the band portion 5220b of the second fired electrode 5220, and the fifth surface S5 of the laminate 100, at the same time. In addition, the insulation material 5500 may be in contact with the protruding portion 5210c of the first fired electrode 5210, the protruding portion 5220c of the second fired electrode 5220, and the sixth surface S6 of the laminate 100, at the same time.

[0245] Meanwhile, the insulation material 5500 may cover the third surface S3 and the fourth surface S4 of the laminate 100 between the first fired electrode 5210 and the second fired electrode 5220.

[0246] The other components except for the above are the same as those of the all-solid-state battery shown in FIG. 1, so the repeated description thereof will be omitted.

[0247] FIG. 13 is a schematic cross-sectional view showing an all-solid-state battery according to another embodiment.

[0248] Referring to FIG. 13, an all-solid-state battery 7000 may include the laminate 100, a first fired electrode 6210, a second fired electrode 6220, a first metal plate electrode 6300, a second metal plate electrode 6400, and an insulation material 6500.

[0249] The first fired electrode 6210 may cover the first surface S1 of the laminate 100, and may extend from the first surface S1 to protrude beyond the fifth surface S5. In addition, the first fired electrode 6210 may extend from the first surface S1 of the laminate 100 to cover a portion of the sixth surface S6.

[0250] For example, the first fired electrode 6210 may include an end portion 6210a, a protruding portion 6210b and a band portion 6210c. The end portion 6210a may cover the first surface S1 of the laminate 100, and the protruding portion 6210b may extend from the end portion 6210a to protrude beyond the fifth surface S5 of the laminate 100, and the band portion 6210c may extend from the end portion 6210a to cover a portion of the sixth surface S6 of the laminate 100.

[0251] Meanwhile, the first fired electrode 6210 may cover a portion of the third surface S3 and a portion of the fourth surface S4 of the laminate 100.

[0252] The second fired electrode 6220 may cover the second surface S2 of the laminate 100, and may extend from the second surface S2 to protrude beyond the fifth surface S5. In addition, the second fired electrode 6220 may extend from the second surface S2 of the laminate 100 to cover a portion of the sixth surface S6.

[0253] For example, the second fired electrode 6220 may include an end portion 6220a, a protruding portion 6220b and a band portion 6220c. The end portion 6220a may cover the second surface S2 of the laminate 100, and the protruding portion 6220b may extend from the end portion 6220a to protrude beyond the fifth surface S5 of the laminate 100, and the band portion 6220c may extend from the end portion 6220a to cover a portion of the sixth surface S6 of the laminate 100.

[0254] Meanwhile, the second fired electrode 6220 may cover a portion of the third surface S3 and a portion of the fourth surface S4 of the laminate 100.

[0255] The first metal plate electrode 6300 may be connected to a first fired electrode 6220.

[0256] The first metal plate electrode 6300 may cover the first fired electrode 6220 on the first surface S1 of the laminate 100, and may extend to protrude beyond the fifth surface S5 and the sixth surface S6 of the laminate 100.

[0257] For example, the two opposite edges along the thickness direction (T-axis direction) of the first metal plate electrode 6300 may be flush with the outer edges of the protruding portion 6210b and the band portion 6210c of the first fired electrode 6210 in the thickness direction (T-axis direction), respectively.

[0258] The second metal plate electrode 6400 may be connected to the second fired electrode 1220.

[0259] The second metal plate electrode 6400 may cover the second fired electrode 6220 on the second surface S2 of the laminate 100, and may extend to protrude beyond the fifth surface S5 and the sixth surface S6 of the laminate 100.

[0260] For example, the two opposite edges along the thickness direction (T-axis direction) of the second metal plate electrode 6400 may be flush with the outer edges of the protruding portion 6220b and the band portion 6220c of the second fired electrode 6220 in the thickness direction (T-axis direction), respectively.

[0261] The insulation material 6500 may cover the fifth surface S5 and the sixth surface S6 of the laminate 100 between the first fired electrode 6220 and the second fired electrode 6220.

[0262] For example, the insulation material 6500 may be in contact with the protruding portion 6210b of the first fired electrode 6210, the protruding portion 6220b of the second fired electrode 6220, and the fifth surface S5 of the laminate 100, at the same time. In addition, the insulation material 5500 may be in contact with the band portion 6210c of the first fired electrode 6210, the band portion 6220c of the second fired electrode 6220, and the sixth surface S6 of the laminate 100, at the same time.

[0263] Meanwhile, the insulation material 6500 may cover the third surface S3 and the fourth surface S4 of the laminate 100 between the first fired electrode 6220 and the second fired electrode 6220.

[0264] The other components except for the above are the same as those of the all-solid-state battery shown in FIG. 1, so the repeated description thereof will be omitted.

[0265] [Manufacturing Example: Manufacture of all-solid-state battery]

[0266] (Example)

[0267] A plurality of striped positive electrode layers were printed on a solid electrolyte layer (green sheet) in the order of a positive electrode active material layer, a positive electrode current collector, and a positive electrode active material layer, and then the space between the positive electrode layers was filled with insulating material to form a positive electrode sheet.

[0268] A plurality of striped negative electrode layers was printed on a solid electrolyte layer (green sheet) in the order of a negative electrode active material layer, a negative electrode collector, a negative electrode active material layer, and then the space between the negative electrode layers was filled with insulating material to form a negative electrode sheet.

[0269] The positive and negative electrode sheets were stacked alternately to form a green chip.

[0270] The green chip was cut to form a laminate.

[0271] The laminate was calcined in an air or nitrogen atmosphere at 350 °C to 400 °C.

[0272] The laminate is pressurized / sintered in an air or nitrogen atmosphere at 400 °C to 550 °C.

[0273] A conductive paste including silver (Ag) was applied to the surface of the laminate.

[0274] A metal plate electrode of a 0.1 mm thickness was attached to the conductive paste when the conductive paste is in a semi-cured state, and then the laminate was sequentially maintained in a curing oven at 80 °C and at 200 °C for 30 minutes, respectively, and then cooled.

[0275] An epoxy molding compound (EMC) was applied to a thickness of 0.5 mm to cover the surface of the laminate exposed between the metal plate electrodes, and then cured to manufacture an all-solid-state battery.

[0276] (Comparative Example 1)

[0277] A plurality of striped positive electrode layers was formed by printing on a solid electrolyte layer (green sheet) in the order of a positive electrode active material layer, a positive electrode current collector, and a positive electrode active material layer, and then a space between the positive electrode layers was filled with an insulating material to form a positive electrode sheet.

[0278] A plurality of striped negative electrode layers was formed by printing on a solid electrolyte layer (green sheet) in the order of a negative electrode active material layer, a negative electrode current collector, and a negative electrode active material layer, and then a space between the negative electrode layers was filled with an insulating material to form a negative electrode sheet.

[0279] The positive and negative electrode sheets were stacked alternately to form a green chip.

[0280] The green chip was cut to form a laminate.

[0281] The laminate was calcined in an air or nitrogen atmosphere at 350 °C to 400 °C.

[0282] The laminate was pressurized / sintered in an air or nitrogen atmosphere at 400 °C to 550 °C.

[0283] A conductive paste for a fired electrode was applied to the surface of the laminate.

[0284] The laminate was sequentially maintained in a curing oven at 80 °C and at 200 °C for 30 minutes, respectively, and then cooled.

[0285] A light curing epoxy was applied to a thickness of 1 mm to cover the surface of the laminate exposed between the fired electrodes and then cured to form an all-solid-state battery.

[0286] (Comparative Example 2)

[0287] Comparative Example 2 was the same as Comparative Example 1 except that heat-curing epoxy instead of light-curing epoxy was applied to a thickness of 2 mm.

[0288] (Comparative Example 3)

[0289] Comparative Example 3 was the same as Comparative Example 1 except that heat-curing epoxy instead of light-curing epoxy was applied to a thickness of 1 mm.

[0290] (Comparative Example 4)

[0291] Comparative Example 4 was the same as Comparative Example 1 except that epoxy molding compound (EMC) instead of light-curing epoxy was applied to a thickness of 1 mm.

[0292] [Experimental Example: Evaluation of charging and discharging of all-solid-state battery]

[0293] Five all-solid-state batteries for each of Example, Comparative Example 1, Comparative Example 2, Comparative Example 3, and Comparative Example 4 were manufactured, and an initial charging and discharging test was performed on one representative sample of the five all-solid-state batteries, respectively. The results are shown in Table 1.

[0294] Referring to Table 1, the charging and discharging proceeded normally in both the all-solid-state battery manufactured according to Example and the all-solid-state batteries manufactured according to Comparative Example 2 and Comparative Example 3.

[0295] On the other hand, the charging and discharging did not proceed normally in the all-solid-state batteries manufactured according to Comparative Example 1 and Comparative Example 3. In other words, the voltage suddenly dropped when charging or the current rapidly decreased when discharging, leaving the all-solid-state batteries unusable. Since the strength of the light-curing epoxy itself was not sufficient in Comparative Example 1, and the thickness of the heat-curing epoxy was relatively thin at 1 mm in Comparative Example 3, it appears that cracks were generated as the volume of the all-solid-state battery expanded, leading to the infiltration of moisture.

[0296] Charge capacityDischarge capacityRemarksExample50mAh23mAhComparative Example1--Crack occurredComparative Example249mAh43mAhComparative Example 3--Crack occurredComparative Example 445mAh36mAh

[0297] 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. <Description of symbols>

[0298] 1000, 2000, 3000, 4000, 5000, 6000, 7000: all-solid-state battery

[0299] 100: laminate

[0300] 110: solid electrolyte layer

[0301] 130: positive electrode layer

[0302] 150: negative electrode layer

[0303] 160: upper protective layer

[0304] 170: lower protective layer

[0305] 180: margin portion

[0306] 210: first fired electrode

[0307] 220: second fired electrode

[0308] 300: first metal plate electrode

[0309] 400: second metal plate electrode

[0310] 500: insulation material

Claims

1.An all-solid-state battery, comprising:a laminate comprising a positive electrode layer, a negative electrode layer, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer;a first fired electrode disposed outside of the laminate and connected to the positive electrode layer;a second fired electrode disposed outside of the laminate and connected to the negative electrode layer;a first metal plate electrode connected to the first fired electrode; anda second metal plate electrode connected to the second fired electrode.2.The all-solid-state battery of claim 1, further comprising:an insulation material that covers an outer surface of the laminate between the first metal plate electrode and the second metal plate electrode and is in contact with the first fired electrode and the second fired electrode.3.The all-solid-state battery of claim 2, whereinthe insulation material comprises an aluminum oxide (Al2O3) or an epoxy molding compound (EMC).4.The all-solid-state battery of claim 1, whereinthe laminate comprises a first surface and a second surface opposing each other in a first direction, a third surface and a fourth surface opposing each other in a second direction crossing the first direction, a fifth surface and a sixth surface opposing each other in a third direction simultaneously crossing the first direction and the second direction;the first fired electrode covers the first surface; andthe second fired electrode covers the second surface.5.The all-solid-state battery of claim 4, whereinan area of the first metal plate electrode is larger than an area of the first surface; andan area of the second metal plate electrode is larger than an area of the second surface.6.The all-solid-state battery of claim 5, whereinan area of the first fired electrode is substantially same as the area of the first surface; andan area of the second fired electrode is substantially same as the area of the second surface.7.The all-solid-state battery of claim 4, whereinthe first fired electrode extends from the first surface to cover a portion of the fifth surface and a portion of the sixth surface; andthe second fired electrode extends from the second surface to cover a portion of the fifth surface and a portion of the sixth surface.8.The all-solid-state battery of claim 7, whereinan area of the first metal plate electrode is substantially same as an area of the first fired electrode; andan area of the second metal plate electrode is substantially same as an area of the second fired electrode.9.The all-solid-state battery of claim 7, further comprising:an insulation material that covers the fifth surface and the sixth surface between the first fired electrode and the second fired electrode.10.The all-solid-state battery of claim 7, whereinthe first metal plate electrode covers at least a portion of the first fired electrode on the fifth surface and the sixth surface; andthe second metal plate electrode covers at least a portion of the second fired electrode on the fifth surface and the sixth surface.11.The all-solid-state battery of claim 10, further comprising:an insulation material that covers the fifth surface and the sixth surface between the first metal plate electrode and the second metal plate electrode and is in contact with the first fired electrode and the second fired electrode.12.The all-solid-state battery of claim 4, whereinthe first fired electrode includes one end extending from the first surface to cover a portion of the fifth surface and another end protruding beyond the sixth surface; andthe second fired electrode includes one end extending from the second surface to cover a portion of the fifth surface and another end protruding beyond the sixth surface.13.The all-solid-state battery of claim 12, further comprising:an insulation material that covers the fifth surface between the first fired electrode and the second fired electrode.14.The all-solid-state battery of claim 13, whereinthe first metal plate electrode covers at least a portion of the one end of the first fired electrode disposed on the fifth surface; andthe second metal plate electrode covers at least a portion of the one end of the second fired electrode disposed on the fifth surface.15.The all-solid-state battery of claim 14, whereinopposite end portions of the insulation material are in contact with the first metal plate electrode and the second metal plate electrode on the one end of the first fired electrode disposed on the fifth surface and the one end of the second fired electrode on the fifth surface, respectively.16.The all-solid-state battery of claim 15, whereinthe other end of the first fired electrode protruding beyond the sixth surface and the other end of the second fired electrode protruding beyond the sixth surface do not overlap the sixth surface.17.The all-solid-state battery of claim 12, whereinan area of the first metal plate electrode is substantially same as an area of the first fired electrode; andan area of the second metal plate electrode is substantially same as an area of the second fired electrode.18.The all-solid-state battery of claim 1, whereineach of the first metal plate electrode and the second metal plate electrode comprises aluminum (Al), iron (Fe), copper (Cu), gold (Au), nickel (Ni) or a combination thereof.19.The all-solid-state battery of claim 1, whereineach of the first fired electrode and the second fired electrode comprise silver (Ag) or copper (Cu).

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