All-solid-state battery and manufacturing method thereof

Abstract

An all-solid-state battery includes: a solid electrolyte layer; and a plurality of electrode layers disposed in the stacking direction, with the solid electrolyte layer interposed between the plurality of electrode layers. At least one of the plurality of electrode layers includes: a current collector in which an active material accommodating portion is provided; and an electrode active material layer disposed in the active material accommodating portion and further disposed at at least one surface of the current collector. The active material accommodating portion may include a plurality of slits provided in the current collector.

Description

Technical Field

[0001] The present disclosure relates to a all-solid-state battery and a method of manufacturing the same. Background Art

[0002] Since portable electronic devices are generally used for a long time, there is a need for high-capacity batteries, and there are requirements for battery safety due to the spread of wearable electronic devices. Therefore, the development of all-solid-state batteries using solid electrolytes instead of liquid electrolytes is being actively carried out.

[0003] An all-solid-state battery is a battery that uses a solid electrolyte instead of a conventional liquid electrolyte, and can greatly reduce the risk of explosion caused by the flammability of the liquid electrolyte. The all-solid-state battery does not use a liquid electrolyte, so that the all-solid-state battery can operate stably even in a harsh environment of relatively high temperature and high pressure. In addition, in the all-solid-state battery, cells can be stacked without a separate cooling unit, so that the all-solid-state battery can achieve a high energy density in the same volume. Therefore, the use of all-solid-state batteries is expected in the future. Summary of the Invention

[0004] Technical Problem One aspect of the embodiments is to provide an all-solid-state battery capable of increasing the amount of active material in a given volume to improve energy density and capacity, and a method of manufacturing the all-solid-state battery.

[0005] However, the problems to be solved by the embodiments of the present disclosure are not limited to the above problems, and various extensions can be made within the scope of the technical idea included in the present disclosure.

[0006] Solution to the Problem An all-solid-state battery according to an embodiment includes: a solid electrolyte layer; and a plurality of electrode layers disposed along a stacking direction, and the solid electrolyte layer is interposed between the plurality of electrode layers. At least one of the plurality of electrode layers includes: a current collector including a plurality of first current collector portions and a second current collector portion, the plurality of first current collector portions being disposed at a certain distance from each other through a plurality of slits, and the second current collector portion contacting one end portion of the plurality of first current collector portions in a planar direction; and an electrode active material layer disposed in the plurality of slits and also disposed on at least one surface of the current collector.

[0007] The plurality of electrode layers may include a first electrode layer and a second electrode layer alternately disposed in the stacking direction. The second current collector portion of the first electrode layer and the second current collector portion of the second electrode layer may be disposed on opposite sides in a first direction of a battery stack including the plurality of electrode layers.

[0008] In the first electrode layer, the plurality of first current collector portions may have a rod shape parallel to the first direction, and the second current collector portion may be in contact with one end portion of the plurality of first current collector portions in the planar direction.

[0009] The second current collector portion may have a rod shape parallel to a second direction of the battery stack, and an edge of the second current collector portion may be exposed on a side surface of the battery stack.

[0010] A first external electrode may be disposed on the side surface of the battery stack to contact the edge of the second current collector portion of the first electrode layer.

[0011] An edge portion may be disposed at an edge of the first electrode layer other than the edge of the second current collector portion of the first electrode layer that is connected to the first external electrode.

[0012] In the second electrode layer, the plurality of first current collector portions may have a rod shape parallel to the first direction, and the second current collector portion may be in contact with the other end portion of the plurality of first current collector portions in the planar direction.

[0013] The second current collector portion may have a rod shape parallel to the second direction of the battery stack, and an edge of the second current collector portion may be exposed on the other side surface of the battery stack.

[0014] A second external electrode may be disposed on the other side surface of the battery stack to contact the edge of the second current collector portion of the second electrode layer.

[0015] An edge portion may be disposed at an edge of the second electrode layer other than the edge of the second current collector portion of the second electrode layer that is connected to the second external electrode.

[0016] The electrode active material layer may be disposed on opposite surfaces of the current collector in the stacking direction.

[0017] A all-solid-state battery according to another embodiment includes: a solid electrolyte layer; and a plurality of electrode layers disposed along a stacking direction, and the solid electrolyte layer is interposed between the plurality of electrode layers. At least one of the plurality of electrode layers includes: a current collector in which an active material accommodation portion is provided; and an electrode active material layer disposed in the active material accommodation portion and also disposed on at least one surface of the current collector.

[0018] The active material accommodating part may include a plurality of slits located in the current collector. The current collector may include a plurality of first current collector parts and a second current collector part. The plurality of first current collector parts are arranged to be spaced apart from each other by the plurality of slits, and the second current collector part contacts one end of the plurality of first current collector parts in the planar direction.

[0019] An edge part may be provided at an edge of at least one of the plurality of electrode layers other than an edge of the second current collector part of at least one of the plurality of electrode layers.

[0020] The electrode active material layer may include a first layer provided at one surface of the current collector, a plurality of second layers provided in the plurality of slits, and a third layer provided at the other surface of the current collector. The first layer and the third layer may be connected as a whole through the plurality of second layers.

[0021] A method for manufacturing an all-solid-state battery according to an embodiment includes: forming an electrode layer on a solid electrolyte layer; and repeatedly stacking the solid electrolyte layer and the electrode layer. The step of forming the electrode layer includes: printing a first active material layer on the solid electrolyte layer; printing a current collector including a plurality of slits on the first active material layer; printing a plurality of second active material layers to fill the plurality of slits; and printing a third active material layer on the current collector and the plurality of second active material layers.

[0022] The step of printing the current collector may include printing the current collector including a plurality of first current collector parts and a second current collector part. The plurality of first current collector parts are arranged to be spaced apart from each other by the plurality of slits, and the second current collector part contacts one end of the plurality of first current collector parts in the planar direction.

[0023] The method may further include forming an edge part at an edge of the electrode layer other than an edge of the second current collector part.

[0024] The step of repeatedly stacking the solid electrolyte layer and the electrode layer may include alternately stacking a first electrode layer and a second electrode layer. The second current collector part of the first electrode layer may be printed to contact one end of the plurality of first current collector parts in the planar direction. The second current collector part of the second electrode layer may be printed to contact the other end of the plurality of first current collector parts in the planar direction. The second current collector part of the first electrode layer and the second current collector part of the second electrode layer may be provided on opposite sides in a first direction of a battery stack including the stacked electrode layers.

[0025] Advantages of the present invention The all-solid-state battery according to the present embodiment can increase the amount of active material without increasing the volume. Accordingly, the all-solid-state battery of the embodiment can improve the energy density and capacity within a given volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a perspective view showing an all-solid-state battery according to an embodiment.

[0027] Figure 2 is along Figure 1 The cross-sectional view of the all-solid-state battery taken along line II-II'.

[0028] Figure 3 is along Figure 1 The cross-sectional view of the all-solid-state battery taken along line III-III'.

[0029] Figure 4 is Figure 1 The perspective view of the positive electrode layer of the all-solid-state battery shown in

[0030] Figure 5 is Figure 4 The exploded perspective view of the positive electrode layer shown in

[0031] Figure 6 is Figure 1 The perspective view of the negative electrode layer of the all-solid-state battery shown in

[0032] Figure 7 is Figure 6 The exploded perspective view of the negative electrode layer shown in

[0033] Figures 8A to 8E is a diagram showing the process of the first step of the manufacturing method of the all-solid-state battery according to an embodiment.

[0034] Figures 9A to 9E is a diagram showing the process of the second step of the manufacturing method of the all-solid-state battery according to an embodiment.

[0035] Figure 10 is a diagram showing the process of the third step of the manufacturing method of the all-solid-state battery according to an embodiment. DETAILED DESCRIPTION

[0036] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Therefore, those of ordinary skill in the art to which the present disclosure pertains can easily practice the embodiments of the present disclosure. The drawings and the description are considered to be illustrative rather than restrictive in nature. Throughout the specification, the same reference numerals denote the same elements. Additionally, in the drawings, some components are exaggerated, omitted, or shown schematically, and the dimensions of each component do not fully reflect the actual dimensions.

[0037] The accompanying drawings are only for easily understanding the embodiments disclosed in this specification, and the technical ideas disclosed in this specification are not limited by the accompanying drawings, and it should be understood that all variations and equivalent or alternative solutions are included in the spirit and technical scope of this disclosure.

[0038] Terms including ordinal numbers (such as first, second, etc.) may be used to describe various configuration elements, but the elements are not limited by such terms. These terms are only for the purpose of distinguishing one element from another.

[0039] It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "above" another element, it may be directly on the other element, or there may also be intervening elements. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements. In addition, throughout the specification, the words "on" or "above" the target element will be understood to mean located above or below the target element, and will not necessarily be understood to mean located "on the upper side" based on the direction opposite to the direction of gravity.

[0040] Throughout the specification, terms such as "comprising" or "having" are intended to indicate the presence of the features, quantities, steps, operations, configuration elements, components, or combinations thereof described in the specification, and it should be understood that there is no exclusion of the possibility of the presence or addition of one or more other features, quantities, steps, operations, configuration elements, components, or combinations thereof. Additionally, unless explicitly described to the contrary, the word "comprising" and variants such as "including" or "having" will be understood to imply including the stated elements but not excluding any other elements.

[0041] In addition, throughout the specification, the phrase "in a plane" means observing the target part from the top, and the phrase "in a cross-section" means observing the cross-section formed by vertically cutting the target part from the side.

[0042] Throughout the specification, "connection" not only means when two or more components are directly connected, but also means when two or more components are indirectly connected through another component, or when physically connected or electrically connected, and it may include cases where parts that are basically integrated with each other but are referred to by different names according to their positions or functions are connected to each other.

[0043] In the description of the all-solid-state battery in this specification, the direction in which the main components of the all-solid-state battery are stacked is defined as the stacking direction, but it may also be the thickness direction. Additionally, the direction parallel to the plane perpendicular to the stacking direction may be defined as the plane direction (plane direction), and this plane direction may include a first direction and a second direction that are orthogonal to each other.

[0044] Figure 1is a perspective view showing a all-solid-state battery according to an embodiment. Figure 2 is a cross-sectional view of the all-solid-state battery taken along line II-II’ of Figure 1 and Figure 3 is a cross-sectional view of the all-solid-state battery taken along line III-III’ of Figure 1 the all-solid-state battery.

[0045] Referring to Figures 1 to 3 , the all-solid-state battery 100 according to an embodiment includes electrode layers 120 and 140 and a solid electrolyte layer 130 disposed adjacent to the electrode layers 120 and 140 in the stacking direction (z-direction in the drawing). The electrode layers 120 and 140 may mainly include current collectors 121 and 141 extending in the planar direction (x-y direction in the drawing) and electrode active material layers 122 and 142 disposed on at least one surface of the current collectors 121 and 141.

[0046] In the present embodiment, the electrode layers 120 and 140 include a positive electrode layer 120 and a negative electrode layer 140 having different polarities. The solid electrolyte layer 130 may include a solidified electrolyte and may function as a medium for transferring ions between the positive electrode layer 120 and the negative electrode layer 140. The positive electrode layer 120 may be a first electrode layer, and the negative electrode layer 140 may be a second electrode layer. The positive electrode layer 120 may include a positive electrode current collector 121 and a positive electrode active material layer 122 disposed on at least one surface of the positive electrode current collector 121. The negative electrode layer 140 may include a negative electrode current collector 141 and a negative electrode active material layer 142 disposed on at least one surface of the negative electrode current collector 141.

[0047] For example, the positive electrode layer 120 disposed at the uppermost part in the stacking direction may include a positive electrode active material layer 122 disposed on one surface (lower surface) of the positive electrode current collector 121, and the negative electrode layer 140 disposed at the lowermost part in the stacking direction may include a negative electrode active material layer 142 disposed on one surface (upper surface) of the negative electrode current collector 141. In addition, the positive electrode layer 120 disposed between the uppermost and lowermost parts may include positive electrode active material layers 122 disposed on both surfaces of the positive electrode current collector 121, and the negative electrode layer 140 disposed between the uppermost and lowermost parts may include negative electrode active material layers 142 disposed on both surfaces of the negative electrode current collector 141.

[0048] The positive electrode active material included in the positive electrode active material layer 122 may be a material including lithium (Li) ions. The positive electrode active material may reversibly intercalate and deintercalate lithium ions. That is, when the all-solid-state battery is charged, the positive electrode active material may be used to supply lithium ions to the negative electrode. The positive electrode active material may affect the capacity and output of the all-solid-state battery.

[0049] The positive electrode active material may include, for example, a compound represented by the following chemical formula: Li a A l-b M b D 2 (0.90 ≤ a ≤ 1.8 and 0 ≤ b ≤ 0.5); Li a E l-b M b O 2-c D c (0.90 ≤ a ≤ 1.8, 0 ≤ b ≤ 0.5 and 0 ≤ c ≤ 0.05); LiE 2-b M b O 4-c D c (0 ≤ b ≤ 0.5 and 0 ≤ c ≤ 0.05); Li a Ni 1-b-c Co b M c D α (0.90 ≤ a ≤ 1.8, 0 ≤ b ≤ 0.5, 0 ≤ c ≤ 0.05 and 0 < α ≤ 2); Li a Ni 1-b-c Co b M c O 2-α X α (0.90 ≤ a ≤ 1.8, 0 ≤ b ≤ 0.5, 0 ≤ c ≤ 0.05 and 0 < α < 2); Li a Ni 1-b- c Co b M c O 2-α X 2 (0.90 ≤ a ≤ 1.8, 0 ≤ b ≤ 0.5, 0 ≤ c ≤ 0.05 and 0 < α < 2); Li a Ni 1-b-c Mn b M c D α (0.90 ≤ a ≤ 1.8, 0 ≤ b ≤ 0.5, 0 ≤ c ≤ 0.05 and 0 < α ≤ 2); Li a Ni 1-b-c Mn b M c O 2-α X α (0.90 ≤ a ≤ 1.8, 0 ≤ b ≤ 0.5, 0 ≤ c ≤ 0.05 and 0 < α < 2); Li a Ni 1-b-c Mn b M c O 2-α X 2(0.90 ≤ a ≤ 1.8, 0 ≤ b ≤ 0.5, 0 ≤ c ≤ 0.05 and 0 < α < 2); Li a Ni b E c G d O 2 (0.90 ≤ a ≤ 1.8, 0 ≤ b ≤ 0.9, 0 ≤ c ≤ 0.5 and 0.001 ≤ d ≤ 0.1); Li a Ni b Co c Mn d G e O 2 (0.90 ≤ a ≤ 1.8, 0 ≤ b ≤ 0.9, 0 ≤ c ≤ 0.5, 0 ≤ d ≤ 0.5 and 0.001 ≤ e ≤ 0.1); Li a NiG b O 2 (0.90 ≤ a ≤ 1.8 and 0.001 ≤ b ≤ 0.1); Li a CoG b O 2 (0.90 ≤ a ≤ 1.8 and 0.001 ≤ b ≤ 0.1); Li a MnG b O2(0.90 ≤ a ≤ 1.8 and 0.001 ≤ b ≤ 0.1); Li a Mn 2 G b O 4 (0.90 ≤ a ≤ 1.8 and 0.001 ≤ b ≤ 0.1); QO 2 ; QS 2 ; LiQS 2 ; V 2 O 5 ; LiV 2 O 2 ; LiRO 2 ; LiNiVO 4 ; Li (3-f) J 2 (PO 4 ) 3 (0 ≤ f ≤ 2); Li (3-f) Fe 2 (PO 4 ) 3 (0 ≤ f ≤ 2) and LiFePO 4. In the chemical formula, 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.

[0050] The positive electrode active material may further include LiCoO 2 , LiMn x O 2x (x = 1 or 2), LiNi 1-x Mn x O 2x (0 < x < 1), LiNi 1-x- y Co x Mn y O 2 (0 ≤ x ≤ 0.5 and 0 ≤ y ≤ 0.5), LiFePO 4 , TiS 2 , FeS 2 , TiS 3 or FeS 3 , but not limited thereto.

[0051] The positive electrode active material may selectively include a conductive material and a binder. However, since organic materials such as the binder decompose during sintering, the organic materials may not remain in the positive electrode active material layer of the final positive electrode current collector.

[0052] There is no particular limitation on the conductive material as long as it has conductivity without causing chemical changes in the all-solid-state battery 100. For example, the conductive material may include: graphite, such as natural graphite, artificial graphite, etc.; carbon-based materials, such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, thermal cracking carbon black, etc.; 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., their oxides, nitrides or fluorides, etc.; conductive whiskers, such as zinc oxide, potassium titanate, etc.; conductive metal oxides, such as titanium oxide, etc.; or conductive materials, such as polyphenylene derivatives, etc.

[0053] Binders can be used to improve the adhesion strength between active materials, conductive materials, etc. The binders can include polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, polytetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene-butadiene rubber, fluororubber, or various copolymers, but the present disclosure is not limited thereto.

[0054] When the all-solid-state battery discharges, the negative electrode active material included in the negative electrode active material layer 142 can generate electrical energy by storing and releasing lithium ions moving from the positive electrode. The negative electrode active material can include carbon-based materials, silicon, silicon oxides, silicon-based alloys, silicon-carbon-based composites, tin, tin-based alloys, tin-carbon composites, metal oxides, or combinations thereof, and can include lithium metal and / or lithium metal alloys.

[0055] The lithium metal alloy can include lithium and a metal / metalloid that can form an alloy with lithium. For example, the metal / metalloid that can form an alloy with lithium can include Si, Sn, Al, Ge, Pb, Bi, Sb, Si-AM alloy (where AM is an alkali metal, alkaline earth metal, group 13 to group 16 element, transition metal, rare earth element, or a combination of these elements, and does not include Si), Sn-AM alloy (where AM is an alkali metal, alkaline earth metal, group 13 to group 16 element, transition metal, transition metal oxide (such as lithium titanium oxide (Li 4 Ti 5 O 12 ), etc.), rare earth elements, or a combination of these elements, and does not include Sn), MnO x (0 < x ≤ 2), etc.

[0056] The element AM can 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 a combination thereof.

[0057] The oxides of the metal / metalloid that can form an alloy with lithium can include lithium titanium oxide, vanadium oxide, lithium vanadium oxide, SnO 2 、SiO x (0 < x < 2), etc. For example, the negative electrode active material can include one or more elements selected from the group consisting of group 13 to group 16 elements of the periodic table. For example, the negative electrode active material can include one or more elements selected from the group consisting of Si, Ge, and Sn.

[0058] The carbon-based material may include crystalline carbon, amorphous carbon, or a mixture thereof. The crystalline carbon may include graphite, such as natural graphite or artificial graphite in amorphous, plate-like, flaky, spherical, or fibrous forms. The amorphous carbon may include soft carbon (low-temperature calcined carbon), hard carbon, mesophase pitch carbide, calcined coke, graphene, carbon black, fullerene soot, carbon nanotubes, carbon fibers, etc., but is not limited thereto.

[0059] Silicon may be selected from the group consisting of: Si, SiO x (0 < x < 2 and, for example, x is in the range of 0.5 to 1.5), Sn, SnO 2 , silicon-containing metal alloys, and mixtures thereof. For example, the silicon-containing metal alloy may include one or more of Al, Sn, Ag, Fe, Bi, Mg, Zn, In, Ge, Pb, and Ti and silicon.

[0060] The negative electrode active material may selectively include a conductive material and a binder.

[0061] There is no particular limitation on the conductive material as long as it has conductivity without causing chemical changes in the all-solid-state battery 100. For example, the conductive material may include: graphite, such as natural graphite, artificial graphite, etc.; carbon-based materials, such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, thermal black, etc.; 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., their oxides, nitrides, or fluorides, etc.; conductive whiskers, such as zinc oxide, potassium titanate, etc.; conductive metal oxides, such as titanium oxide, etc.; or conductive materials, such as polyphenylene derivatives, etc.

[0062] The binder can be used to improve the adhesion strength between the active material and the conductive material, etc. The binder may include polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, polytetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene-butadiene rubber, fluororubber, or various copolymers, but the present disclosure is not limited thereto.

[0063] The solid electrolyte layer 130 may be disposed adjacent to each other in the stacking direction between the positive electrode active material layer 122 of the positive electrode layer 120 and the negative electrode active material layer 142 of the negative electrode layer 140. Therefore, a plurality of positive electrode layers 120 and a plurality of negative electrode layers 140 may be alternately disposed within the all-solid-state battery 100, and the solid electrolyte layer 130 may be stacked and interposed between the positive electrode layer 120 and the negative electrode layer 140.

[0064] The solid electrolyte included in the solid electrolyte layer 130 may include a glass-ceramic-based electrolyte, which includes lithium halides (LiX (halogen element (X) = F, Br, Cl, I, etc.)). Glass-ceramics (or crystalline glass) refer to a crystallographic mixture of crystalline materials and amorphous materials that exhibit peaks and halos in X-ray diffraction, electron beam diffraction, etc. Therefore, a glass-ceramic-based electrolyte is an electrolyte that has undergone partial crystallization through sintering and in which amorphous materials and crystalline materials are mixed.

[0065] The glass-ceramic-based electrolyte may be a mixture of an amorphous material and two or more types of crystalline materials. In addition, the crystalline materials included in the glass-ceramic-based electrolyte may include a lithium-containing lithium compound crystal phase.

[0066] When the glass-ceramic-based electrolyte is included, sufficient densification is achieved after sintering, whereby high ionic conductivity can be achieved.

[0067] The glass-ceramic-based electrolyte may include lithium (Li) oxide, boron (B) oxide, silicon (Si) oxide, aluminum (Al) oxide, gallium (Ga) oxide, phosphorus (P) oxide, germanium (Ge) oxide, magnesium (Mg) oxide, and lithium chloride (LiCl). As a specific example, the glass-ceramic-based electrolyte may include Li 2 O-B 2 O 3 -SiO 2 -P 2 O 5 -GeO 2 -LiCl.

[0068] On the other hand, the solid electrolyte included in the solid electrolyte layer 130 may include a lithium borosilicate-based electrolyte (hereinafter referred to as an LBSO-based electrolyte). The LBSO-based electrolyte is a glassy electrolyte, and glass refers to a crystallographically amorphous substance that exhibits halos in X-ray diffraction, electron beam diffraction, etc.

[0069] When the LBSO-based electrolyte is included, the amorphous state can be maintained during sintering while reducing the sintering temperature. Therefore, it has the advantages of achieving high ionic conductivity and having low reactivity with the electrode. The LBSO-based electrolyte may include lithium (Li), boron (B), silicon (Si), aluminum (Al), phosphorus (P), germanium (Ge), and sulfur (S).

[0070] The solid electrolyte included in the solid electrolyte layer 130 may be at least one selected from the group consisting of garnet type, sodium superionic conductor (NASICON) type, lithium superionic conductor (LISICON) type, perovskite type, and LiPON type.

[0071] Garnet-type solid electrolytes can refer to lithium lanthanum zirconium oxides (LLZO) represented by Li a La b Zr c O 12 such as Li 7 La 3 Zr 2 O 12 etc.), and NASICON-type solid electrolytes can refer to lithium aluminum titanium phosphates (LATP) Li 1+x Al x M 2-x PO 43 (LAMP) (0 < x < 2 and M is Zr, Ti or Ge) type compounds generated by introducing Ti into Li 1+x Al x Ti 2-x (PO 4 ) 3 (0 < x < 1), lithium aluminum germanium phosphates (LAGP) represented by Li 1+x Al x Ge 2-x (PO 4 ) 3 (0 < x < 1) (such as Li 1.3 Al 0.3 Ge 1.7 (PO 4 ) 3 etc. containing excess lithium) and / or lithium-zirconium-phosphate (LZP) of LiZr 2 (PO 4 ) 3 .

[0072] LISICON-type solid electrolytes can refer to: solid solution oxides represented by xLi 3 AO 4 -(1 - x)Li 4 BO 4 (A is P, As, V, etc. and B is Si, Ge, Ti, etc.), such as Li 4 Zn(GeO 4 ) 4 , Li 10 GeP 2 O 12 (LGPO), Li 3.5 Si 0.5 P 0.5 O 4 , Li 10.42 Si(Ge) 1.5 P 1.5 Cl 0.08 O 11.92 etc., and those composed of Li4-x M 1-y M′ y S 4 A solid solution sulfide represented by (M = Si or Ge and M' = P, Al, Zn, or Ga), such as Li 2 S-P 2 S 5 、Li 2 S-SiS 2 、Li 2 S-SiS 2 -P 2 S 5 、Li 2 S-GeS 2 etc.

[0073] The perovskite-based solid electrolyte may refer to lithium lanthanum titanate (LLTO) represented by Li 3x La 2 / 3-x □ 1 / 3-2x TiO 3 (0 < x < 0.16 and □ represents a vacancy), such as Li 1 / 8 La 5 / 8 TiO 3 etc., and the LiPON-type solid electrolyte may refer to, for example, a nitride of lithium phosphorus oxynitride, such as Li 2.8 PO 3.3 N 0.46 etc.

[0074] The positive electrode layer 120, the solid electrolyte layer 130, and the negative electrode layer 140 may be stacked as described above to form a battery stack of the all-solid-state battery 100. The outer insulating layer 135 covering the positive electrode current collector 121 may be provided at the uppermost outer portion of the battery stack, and the outer insulating layer 136 covering the negative electrode current collector may be provided at the lowermost outer portion of the battery stack. In addition, protective layers 137 and 138 including an insulating material may be additionally provided outside the outer insulating layers 135 and 136 to prevent ion leakage and ensure insulation performance.

[0075] One side edge of the positive electrode layer 120 (e.g., one side edge of the positive electrode current collector 121) may be exposed to one side surface (right side surface) of the battery stack, and one side edge of the negative electrode layer 140 (e.g., one side edge of the negative electrode current collector 141) may be exposed to the other side surface (left side surface) of the battery stack. One side surface and the other side surface of the battery stack may be two side surfaces that face each other in the first direction (x direction in the drawing) in the planar direction.

[0076] The external positive electrode 161 may be disposed on one side surface of the battery stack to be connected to the plurality of positive electrode layers 120, and the external negative electrode 162 may be disposed on the other side surface of the battery stack to be connected to the plurality of negative electrode layers 140. The edge portions 151 and 152 are regions between the positive electrode layer 120 and the external negative electrode 162 and between the negative electrode layer 140 and the external positive electrode 161. That is, the positive electrode edge portion 151 is a region between the external negative electrode 162 and the positive electrode layer 120, and the negative electrode edge portion 152 is a region between the external positive electrode 161 and the negative electrode layer 140.

[0077] In the positive electrode edge portion 151 and the negative electrode edge portion 152, there may be a material having a low ion conductivity and a low electrical conductivity (i.e., an insulating material) (i.e., an insulating material), and there may be a material having an ion conductivity (or electrical conductivity) similar to that of the solid electrolyte. For example, when there is a material having an ion conductivity (or electrical conductivity) similar to that of the solid electrolyte in this region, the material may be the same as or different from the solid electrolyte in other regions. As another example, a material having an ion conductivity (or electrical conductivity) similar to that of the solid electrolyte and an insulating material may coexist in this region.

[0078] The external positive electrode 161 may be a first external electrode, and the external negative electrode 162 may be a second external electrode.

[0079] Figure 4 is Figure 1 a perspective view of the positive electrode layer of the all-solid-state battery shown in Figure 5 is Figure 4 an exploded perspective view of the positive electrode layer shown in

[0080] Referring to Figure 4 and Figure 5 the positive electrode layer 120 includes a positive electrode current collector 121 and a positive electrode active material layer 122. The positive electrode current collector 121 may include: a plurality of first current collector portions 121a disposed at a certain distance from each other through a plurality of slits 125; and a second current collector portion 121b in contact with one end portion of the plurality of first current collector portions 121a in the planar direction. The positive electrode active material layer 122 may fill the plurality of slits 125 and may be disposed on at least one surface of the positive electrode current collector 121. Figure 4 and Figure 5 show the positive electrode active material layer 122 disposed on two surfaces of the positive electrode current collector 121.

[0081] For example, the positive electrode current collector 121 may be made of stainless steel, nickel (Ni), copper (Cu), tin (Sn), aluminum (Al), or an alloy thereof, but is not limited thereto.

[0082] In addition, the positive current collector 121 may be coated with an antioxidant metal or an antioxidant alloy film to prevent oxidation.

[0083] The positive current collector 121 may be made of a carbon-based material. The positive current collector 121 may be made of a conductive carbon material. The conductive carbon material may include conductive fibers (such as graphite, carbon nanotubes (CNT), vapor-grown carbon fibers (VGCF), etc.) or conductive carbon (such as carbon black, etc.).

[0084] On the other hand, the positive current collector may also include one or more types of solid electrolytes.

[0085] Each of the plurality of slits 125 may have a rod shape parallel to the first direction, and the plurality of slits 125 may have the same length and the same width. Each of the plurality of first current collector portions 121a may have a rod shape parallel to the first direction, and the plurality of first current collector portions 121a may have the same length and the same width, but the present disclosure is not limited to this example. The plurality of slits 125 may be arranged side by side along the second direction (the y direction in the drawing), and the first current collector portions 121a and the slits 125 may be alternately arranged one by one along the second direction.

[0086] The second current collector portion 121b may be in contact with one side end (the right end) of the plurality of first current collector portions 121a in the planar direction, so as to be integrally connected to the plurality of first current collector portions 121a. The second current collector portion 121b may have a rod shape parallel to the second direction, and the edge of the second current collector portion 121b may be exposed to one side surface (the right surface) of the battery stack to contact the external positive electrode 161. The plurality of first current collector portions 121a and the second current collector portion 121b may form a comb-shaped positive current collector 121.

[0087] The positive electrode active material layer 122 may fill the plurality of slits 125 and may be provided on both surfaces of the positive current collector 121. That is, the positive electrode active material layer 122 may include a multi-layer structure as described below: a first layer 122a provided on the lower surface of the positive current collector 121, a second layer 122b filling the plurality of slits 125, and a third layer 122c provided on the upper surface of the positive current collector 121. The first layer 122a and the third layer 122c may be connected as a whole through the second layer 122b. The plurality of slits 125 provided in the positive current collector 121 are active material accommodating portions, and the second layer 122b of the positive electrode active material layer 122 is accommodated in the plurality of slits 125.

[0088] In the positive electrode layer 120, the positive electrode edge portion 151 may be provided at the remaining edges except for the edge of the second current collector portion 121b that is to be connected to the external positive electrode 161. For example, the positive electrode edge portion 151 may be provided at three of the four edges of the positive electrode layer 120, except for one side edge (right side edge) of the edge where the second current collector portion 121b is provided. Additionally, the positive electrode edge portion 151 may be provided in a manner that contacts two surfaces of the second current collector portion 121b. The positive electrode edge portion 151 provided on the two surfaces of the second current collector portion 121b may contact the first layer 122a and the third layer 122c of the positive electrode active material layer 122 in the planar direction.

[0089] Figure 6 is Figure 1 a perspective view of the negative electrode layer of the all-solid-state battery shown in Figure 7 is Figure 6 an exploded perspective view of the negative electrode layer shown in

[0090] Referring to Figure 6 and Figure 7 , the negative electrode layer 140 includes a negative electrode current collector 141 and a negative electrode active material layer 142. The negative electrode current collector 141 may include: a plurality of first current collector portions 141a, provided to be spaced apart from each other by a certain distance through a plurality of slits 145; and a second current collector portion 141b, contacting one end portion of the plurality of first current collector portions 141a in the planar direction. The negative electrode active material layer 142 may fill the plurality of slits 145 and may be provided on at least one surface of the negative electrode current collector 141. Figure 6 and Figure 7 show the negative electrode active material layer 142 provided on two surfaces of the negative electrode current collector 141.

[0091] For example, the negative electrode current collector 141 may be made of stainless steel, nickel (Ni), copper (Cu), tin (Sn), aluminum (Al), or an alloy thereof, but is not limited thereto.

[0092] Additionally, the negative electrode current collector 141 may be coated with an antioxidant metal or an antioxidant alloy film to prevent oxidation.

[0093] Similar to the positive electrode current collector 121, the negative electrode current collector 141 may be made of a conductive carbon-based material and may include one or more types of solid electrolytes. The negative electrode current collector 141 may be the same as the negative electrode active material.

[0094] Each of the plurality of slits 145 may have a rod shape parallel to the first direction, and the plurality of slits 145 may have the same length and the same width. Each of the plurality of first current collector portions 141a may have a rod shape parallel to the first direction, and the plurality of first current collector portions 141a may have the same length and the same width, but the present disclosure is not limited to this example. The plurality of slits 145 may be arranged side by side along the second direction, and the first current collector portions 141a and the slits 145 may be alternately arranged one by one along the second direction.

[0095] The second current collector portion 141b may be in contact with one end portion (left end portion) of the plurality of first current collector portions 141a in the planar direction, so as to be integrally connected to the plurality of first current collector portions 141a. The second current collector portion 141b may have a rod shape parallel to the second direction, and an edge of the second current collector portion 141b may be exposed to the other surface (left surface) of the battery stack to contact the external negative electrode 162. The plurality of first current collector portions 141a and the second current collector portion 141b may form a comb-shaped negative electrode current collector 141.

[0096] The negative electrode active material layer 142 may fill the plurality of slits 145 and may be provided on both surfaces of the negative electrode current collector 141. That is, the negative electrode active material layer 142 may include a multi-layer structure as described below: a first layer 142a provided on the lower surface of the negative electrode current collector 141, a second layer 142b filling the plurality of slits 145, and a third layer 142c provided on the upper surface of the negative electrode current collector 141. The first layer 142a and the third layer 142c may be integrally connected by the second layer 142b. The plurality of slits 145 provided at the negative electrode current collector 141 are active material accommodation portions, and the second layer 142b of the negative electrode active material layer 142 is accommodated in the plurality of slits 145.

[0097] In the negative electrode layer 140, the negative electrode edge portion 152 may be provided at the remaining edges except for the edge of the second current collector portion 141b that is to be connected to the external negative electrode 162. For example, the negative electrode edge portion 152 may be provided at three of the four edges of the negative electrode layer 140 except for one side edge (left edge) of the edge where the second current collector portion 141b is provided. In addition, the negative electrode edge portion 152 may be provided in a manner of contacting both surfaces of the second current collector portion 141b. The negative electrode edge portions 152 provided on both sides of the second current collector portion 141b may be in contact with the first layer 142a and the third layer 142c of the negative electrode active material layer 142 in the planar direction.

[0098] Refer to Figures 4 to 7, in the above-mentioned positive electrode layer 120 and negative electrode layer 140, the current collectors 121 and 141 include a plurality of slits 125 and 145 to accommodate the active material layers 122 and 142. The current collectors 121 and 141 that conduct electrons do not directly contribute to the capacity of the all-solid-state battery 100. However, in the all-solid-state battery 100 according to this embodiment, the current collectors 121 and 141 achieve the effect of filling a part of their volume with active materials. Therefore, the capacity can be increased by increasing the amount of active materials without expanding the volume of the all-solid-state battery 100.

[0099] In a conventional all-solid-state battery, the current collector is formed as a simple quadrilateral sheet, and the active material layer is disposed on at least one surface of the sheet-shaped current collector. When the conventional all-solid-state battery and the all-solid-state battery 100 of the embodiment have the same volume, compared with the conventional all-solid-state battery, the all-solid-state battery 100 of the embodiment can have a larger amount of active materials, so that the all-solid-state battery 100 of the embodiment improves the energy density and capacity compared with the conventional all-solid-state battery.

[0100] For example, if in the active material layer, the area of each of the first layer and the second layer disposed on two surfaces of the current collector is 0.9025 cm 2 , and the thickness of each of the first layer and the second layer is 0.0007 cm, then the volume of each of the first layer and the second layer is 0.000632 cm 3 . If the proportion of the active material in the volume of each of the first layer and the second layer is 55% by volume, and the capacity of lithium cobaltate (LCO or LiCoO 2 ) is 670.6 mAh / cm 3 , then the capacity of each of the first layer and the second layer is calculated to be approximately 0.233 mAh.

[0101] If a sheet-shaped current collector without slits has an area of 0.9025 cm 2 and a thickness of 0.0003 cm, then the volume of the current collector is 0.000271 cm 3 . For such a current collector, assuming that the slits occupy 50% of the volume of the current collector and the slits are filled with the active material layer of the third layer, the capacity of the third layer is calculated to be approximately 0.05 mAh. In the same way, assuming that the slits occupy 70% of the volume of the current collector and the slits are filled with the active material layer of the third layer, the capacity of the third layer is calculated to be approximately 0.07 mAh.

[0102] Therefore, when the third layer occupies 50% of the volume of the current collector, the electrode layer can show an increase in capacity of approximately 10.7%, and when the third layer occupies 70% of the volume of the current collector, the electrode layer can show an increase in capacity of approximately 15%.

[0103] Next, a manufacturing method of the all-solid-state battery 100 having the above-described configuration will be described.

[0104] The manufacturing method of the all-solid-state battery 100 according to the embodiment includes: a first step of forming a positive electrode layer 120 on a solid electrolyte layer 130; a second step of forming a negative electrode layer 140 on the solid electrolyte layer 130; and a third step of alternately laminating the positive electrode layer 120 and the negative electrode layer 140 with the solid electrolyte layer 130 interposed between the positive electrode layer 120 and the negative electrode layer 140. The positive electrode layer 120 may be a first electrode layer, and the negative electrode layer 140 may be a second electrode layer. The order of the first step and the second step is only for convenience and does not indicate a strict chronological order.

[0105] Figures 8A to 8E is a diagram showing the process of the first step.

[0106] Referring to Figure 8A , the solid electrolyte layer 130 can be prepared, and a first layer 122a can be formed by printing an active material paste on the solid electrolyte layer 130 and then drying the active material paste. The first layer 122a may be a first active material layer. Thereafter, a first edge portion 151a can be formed by printing an insulating paste on the solid electrolyte layer 130 and then drying the insulating paste. The first edge portion 151a can contact one side edge (right side edge) of the first layer 122a in the planar direction. On the other hand, the first edge portion 151a can be made of a material having an ion conductivity (or conductivity) similar to that of the solid electrolyte, and can be made of a material having an ion conductivity (or conductivity) similar to that of the solid electrolyte and an insulating material.

[0107] Referring to Figure 8B , a current collector 121 can be formed by printing and then drying a conductive paste on the first layer 122a and the first edge portion 151a. The current collector 121 may include a plurality of first current collector portions 121a spaced apart from each other by a plurality of slits 125 and a second current collector portion 121b contacting one side end portion (right side end portion) of the plurality of first current collector portions 121a in the planar direction. The plurality of first current collector portions 121a may have a rod shape parallel to the first direction, and the second current collector portion 121b may have a rod shape parallel to the second direction.

[0108] Referring to Figure 8C , a second layer 122b can be formed by printing an active material paste in the plurality of slits 125 and then drying the paste. The second layer 122b may be a second active material layer. The second layer 122b can contact the first layer 122a in the stacking direction and can completely fill the plurality of slits 125.

[0109] Referring to Figure 8D, the third layer 122c can be formed by printing an active material paste on the current collector 121 and the second layer 122b and then drying the paste. The third layer 122c can be a third active material layer. The third layer 122c can cover all of the plurality of first current collector portions 121a, all of the plurality of second layers 122b, and a part of the second current collector portion 121b. The third layer 122c can be in contact with the plurality of second layers 122b in the stacking direction. Thereafter, the second edge portion 151b can be formed by printing an insulating paste on the second current collector portion 121b and then drying the paste. The second edge portion 151b can be in contact with one side edge (right side edge) of the third layer 122c in the planar direction. On the other hand, the second edge portion 151b can be made of a material having an ion conductivity (or conductivity) similar to that of the solid electrolyte, and can be made of a material having an ion conductivity (or conductivity) similar to that of the solid electrolyte and an insulating material.

[0110] Refer to Figure 8E , the third edge portion 151c can be formed by printing an insulating paste on three edges out of the four edges of the stack including the first layer 122a, the second layer 122b, the third layer 122c, the first edge portion 151a, the second edge portion 151b, and the current collector 121, except for one side edge (right side edge) of the edge where the second current collector portion 121b is provided, and then drying the insulating paste. The third edge portion 151c can be in contact with the three edges of the stack in the planar direction, and the third edge portion 151c can have the same thickness as the thickness of the stack. On the other hand, the third edge portion 151c can be made of a material having an ion conductivity (or conductivity) similar to that of the solid electrolyte, and can be made of a material having an ion conductivity (or conductivity) similar to that of the solid electrolyte and an insulating material.

[0111] Figures 9A to 9E is a diagram showing the process of the second step.

[0112] Refer to Figure 9A, a solid electrolyte layer 130 can be prepared, and a first layer 142a can be formed by printing an active material paste on the solid electrolyte layer 130 and then drying the active material paste. The first layer 142a can be a first active material layer. Thereafter, a first edge portion 152a can be formed by printing an insulating paste on the solid electrolyte layer 130 and then drying the insulating paste. The first edge portion 152a can contact one side edge (left side edge) of the first layer 142a in the planar direction. On the other hand, the first edge portion 152a can be made of a material having an ion conductivity (or conductivity) similar to that of the solid electrolyte, and can be made of a material having an ion conductivity (or conductivity) similar to that of the solid electrolyte and an insulating material.

[0113] Referring to Figure 9B , a current collector 141 can be formed by printing a conductive paste on the first layer 142a and the first edge portion 152a and then drying the conductive paste. The current collector 141 can include a plurality of first current collector portions 141a spaced apart from each other by a plurality of slits 145 and a second current collector portion 141b contacting one side end portion (left side end portion) of the plurality of first current collector portions 141a in the planar direction. The plurality of first current collector portions 141a can have a rod shape parallel to the first direction, and the second current collector portion 141b can have a rod shape parallel to the second direction.

[0114] Referring to Figure 9C , a second layer 142b can be formed by printing an active material paste in the plurality of slits 145 and then drying the paste. The second layer 142b can be a second active material layer. The second layer 142b can contact the first layer 142a in the stacking direction and can completely fill the plurality of slits 145.

[0115] Referring to Figure 9D , a third layer 142c can be formed by printing an active material paste on the current collector 141 and the second layer 142b and then drying the paste. The third layer 142c can be a third active material layer. The third layer 142c can cover all of the plurality of first current collector portions 141a, all of the plurality of second layers 142b, and a part of the second current collector portion 141b. The third layer 142c can contact the plurality of second layers 142b in the stacking direction. Thereafter, a second edge portion 152b can be formed by printing an insulating paste on the second current collector portion 141b and then drying the paste. The second edge portion 152b can contact one side edge (left side edge) of the third layer 142c in the planar direction. On the other hand, the second edge portion 152b can be made of a material having an ion conductivity (or conductivity) similar to that of the solid electrolyte, and can be made of a material having an ion conductivity (or conductivity) similar to that of the solid electrolyte and an insulating material.

[0116] Referring to Figure 9E , the third edge portion 152c can be formed in the following manner: Printing an insulating paste at three edges out of the four edges of the stack including the first layer 142a, the second layer 142b, the third layer 142c, the first edge portion 152a, the second edge portion 152b, and the current collector 141, except for one side edge (left side edge) of the edge where the second current collector portion 141b is provided, and then drying the insulating paste. The third edge portion 152c can contact three edges of the stack in the planar direction, and the third edge portion 152c can have the same thickness as the thickness of the stack. On the other hand, the third edge portion 152c can be made of a material having an ion conductivity (or conductivity) similar to that of the solid electrolyte, and can be made of a material having an ion conductivity (or conductivity) similar to that of the solid electrolyte and an insulating material.

[0117] Figure 10 is a diagram showing the process of the third step Referring to Figure 10 , a battery stack can be formed by alternately stacking a positive electrode layer 120 and a negative electrode layer 140 with a solid electrolyte layer 130 interposed between the positive electrode layer 120 and the negative electrode layer 140. An outer insulating layer and a protective layer (not shown) can be additionally provided at the outermost upper portion of the battery stack, and an outer insulating layer and a protective layer (not shown) can be additionally provided at the outermost lower portion of the battery stack. Thereafter, an external positive electrode and an external negative electrode (not shown) can be provided on two surfaces of the battery stack to constitute an all-solid-state battery.

[0118] Although the present disclosure has been described in connection with what is currently considered to be practical embodiments, it should be understood that the present disclosure is not limited to the disclosed embodiments. In contrast, the present disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

[0119] <Explanation of reference numerals> 100: All-solid-state battery 120, 140: Electrode layer 120: Positive electrode layer 121: Positive electrode current collector 122: Positive electrode active material layer 140: Negative electrode layer 141: Negative electrode current collector 142: Negative electrode active material layer 125, 145: Slit 121a, 141a: First current collector portion 121b, 141b: Second current collector portion 130: Solid electrolyte layer 135, 136: Outer insulation layer 137, 138: Protective layer 151, 152: Edge part 151: First edge part 152: Second edge part 161: External positive electrode 162: External negative electrode

Claims

1. A all-solid-state battery, comprising: a solid electrolyte layer; and a plurality of electrode layers arranged along a stacking direction, and the solid electrolyte layer is interposed between the plurality of electrode layers, wherein at least one of the plurality of electrode layers includes: a current collector including a plurality of first current collector portions and a second current collector portion, the plurality of first current collector portions being arranged to be spaced apart from each other by a plurality of slits, and the second current collector portion contacting one end portion of the plurality of first current collector portions in a planar direction; and an electrode active material layer provided in the plurality of slits and also provided on at least one surface of the current collector.

2. The all-solid-state battery according to claim 1, wherein the plurality of electrode layers include a first electrode layer and a second electrode layer alternately arranged in the stacking direction, and the second current collector portion of the first electrode layer and the second current collector portion of the second electrode layer are provided on opposite sides in a first direction of a battery stack including the plurality of electrode layers.

3. The all-solid-state battery according to claim 2, wherein in the first electrode layer, the plurality of first current collector portions have a rod shape parallel to the first direction, and the second current collector portion contacts the one end portion of the plurality of first current collector portions in the planar direction.

4. The all-solid-state battery according to claim 3, wherein in the first electrode layer, the second current collector portion has a rod shape parallel to a second direction of the battery stack, and an edge of the second current collector portion is exposed on a side surface of the battery stack.

5. The all-solid-state battery according to claim 4, the all-solid-state battery further includes a first external electrode, and the first external electrode is provided on the side surface of the battery stack to contact the edge of the second current collector portion of the first electrode layer.

6. The all-solid-state battery according to claim 5, the all-solid-state battery further includes an edge portion, and the edge portion is provided at an edge of the first electrode layer except for the edge of the second current collector portion of the first electrode layer connected to the first external electrode.

7. The all-solid-state battery according to claim 2, wherein in the second electrode layer, the plurality of first current collector portions have a rod shape parallel to the first direction, and the second current collector portion contacts the other end portion of the plurality of first current collector portions in the planar direction.

8. The all-solid-state battery according to claim 7, wherein in the second electrode layer, the second current collector portion has a rod shape parallel to the second direction of the battery stack, and an edge of the second current collector portion is exposed on the other side surface of the battery stack.

9. The all-solid-state battery according to claim 8, the all-solid-state battery further includes a second external electrode, and the second external electrode is provided on the other side surface of the battery stack to contact the edge of the second current collector portion of the second electrode layer.

10. The all-solid-state battery according to claim 9, wherein the all-solid-state battery further includes an edge portion provided at an edge of the second electrode layer except for an edge of the second current collector portion of the second electrode layer connected to the second external electrode.

11. The all-solid-state battery according to claim 1, wherein, the electrode active material layer is provided on opposite surfaces of the current collector in the stacking direction.

12. An all-solid-state battery, comprising: a solid electrolyte layer; and a plurality of electrode layers arranged in a stacking direction, with the solid electrolyte layer interposed between the plurality of electrode layers, wherein at least one of the plurality of electrode layers includes: a current collector in which an active material accommodation portion is provided; and an electrode active material layer provided in the active material accommodation portion and also provided at at least one surface of the current collector.

13. The all-solid-state battery according to claim 12, wherein, the active material accommodation portion includes a plurality of slits located in the current collector.

14. The all-solid-state battery according to claim 13, wherein, the current collector includes a plurality of first current collector portions and a second current collector portion, the plurality of first current collector portions are arranged to be spaced apart from each other by the plurality of slits, and the second current collector portion contacts one end portion of the plurality of first current collector portions in a planar direction.

15. The all-solid-state battery according to claim 14, wherein the all-solid-state battery further includes an edge portion provided at an edge of at least one of the plurality of electrode layers except for an edge of the second current collector portion of at least one of the plurality of electrode layers.

16. The all-solid-state battery according to claim 14, wherein, the electrode active material layer includes a first layer provided at one surface of the current collector, a plurality of second layers provided in the plurality of slits, and a third layer provided at the other surface of the current collector, and the first layer and the third layer are connected as a single body through the plurality of second layers.

17. A method for manufacturing an all-solid-state battery, comprising: forming an electrode layer on a solid electrolyte layer; and repeatedly stacking the solid electrolyte layer and the electrode layer, wherein the step of forming the electrode layer includes: printing a first active material layer on the solid electrolyte layer; printing a current collector including a plurality of slits on the first active material layer; printing a plurality of second active material layers to fill the plurality of slits; and printing a third active material layer on the current collector and the plurality of second active material layers.

18. The manufacturing method according to claim 17, wherein, the step of printing the current collector includes printing the current collector including a plurality of first current collector portions and a second current collector portion, the plurality of first current collector portions are arranged to be spaced apart from each other by the plurality of slits, and the second current collector portion contacts one end portion of the plurality of first current collector portions in a planar direction.

19. The manufacturing method according to claim 18, the manufacturing method further comprising: An edge portion is formed at an edge of the electrode layer other than an edge of the second current collector portion.

20. The manufacturing method according to claim 18, wherein the step of repeatedly stacking the solid electrolyte layer and the electrode layer includes alternately stacking a first electrode layer and a second electrode layer, the second current collector portion of the first electrode layer is printed to contact the one end portion of the plurality of first current collector portions in the planar direction, the second current collector portion of the second electrode layer is printed to contact the other end portion of the plurality of first current collector portions in the planar direction, and the second current collector portion of the first electrode layer and the second current collector portion of the second electrode layer are provided on opposite sides in a first direction of a battery stack including the stacked electrode layers.

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