All-solid-state battery

Abstract

An all-solid-state battery has opposing first and second side surfaces, and includes: a first unit cell including a first positive electrode active material layer including a first edge layer in one side direction close to the first side surface, a second negative electrode active material layer including a second edge layer in one side direction close to the second side surface, and a solid electrolyte layer including a second edge layer in one side direction close to the second side surface; a second negative electrode active material layer including a second edge layer in the one side direction and the other side direction, and a solid electrolyte layer disposed between the first positive electrode active material layer and the second negative electrode active material layer; and a second unit cell including a second positive electrode active material layer including a second edge layer in the one side direction and the other side direction, a first negative electrode active material layer, and a solid electrolyte layer, the first negative electrode active material layer comprises a first edge layer in the direction of the other side close to the second side surface, and the solid electrolyte layer is arranged between the second positive electrode active material layer and the first negative electrode active material layer. The first unit cell and the second unit cell are connected in series.

Description

Technical Field

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

[0002] Recently, due to the need for downsizing and long-term use of portable electronic devices, high-capacity batteries are required, and the safety of batteries is also required due to the popularity 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] Since all-solid-state batteries do not use flammable organic solvents, additional safety circuits can be simplified. Therefore, all-solid-state batteries are expected to be a technology capable of manufacturing safe batteries with high capacity per unit volume.

[0004] In addition, compared with sulfide all-solid-state batteries that use sulfide electrolytes that react with oxygen and moisture in the air, the use of sulfide electrolytes with ionic conductivity (10 -2 S / cm) low ionic conductivity (10 -4 S / cm to 10 -6 Oxide all-solid-state batteries with oxide electrolytes of 2.5 K (S / cm) require high-temperature sintering processes but show excellent stability.

[0005] The stacked oxide all-solid-state battery is a micro-sized battery and thus can be mounted on a substrate like a passive device, and in addition, the stacked oxide all-solid-state battery is stable even when exposed to a high temperature in a reflow process for this purpose. Summary of the invention

[0006] Technical issues

[0007] An aspect of an embodiment provides an all-solid-state battery capable of realizing a high-voltage battery.

[0008] However, the exemplary embodiments of the present invention are not limited thereto but may be applied in various ways within the scope of the technical ideas included in the exemplary embodiments.

[0009] Technical Solution

[0010] The all-solid-state battery according to the embodiment has a first side surface and a second side surface facing each other, and includes: a first unit cell including a first positive electrode active material layer, a second negative electrode active material layer and a solid electrolyte layer, the first positive electrode active material layer including a first edge layer in one side direction close to the first side surface, the second negative electrode active material layer including a second edge layer in the one side direction and the other side direction, and the solid electrolyte layer being arranged between the first positive electrode active material layer and the second negative electrode active material layer in a stacking direction; and a second unit cell including a second positive electrode active material layer, a first negative electrode active material layer and a solid electrolyte layer, the second positive electrode active material layer including a second edge layer in the one side direction and the other side direction, the first negative electrode active material layer including a first edge layer in the other side direction close to the second side surface, and the solid electrolyte layer being arranged between the second positive electrode active material layer and the first negative electrode active material layer in the stacking direction. The first unit cell and the second unit cell are connected in series.

[0011] The second negative active material layer of the first unit cell and the second positive active material layer of the second unit cell may be disposed adjacent to each other in the stacking direction with an inner current collecting layer interposed therebetween.

[0012] The inner current collecting layer may include a second edge layer in the one side direction and the other side direction.

[0013] The second edge layer may be disposed along an edge of one or more of the second positive active material layer, the second negative active material layer, and the inner current collecting layer.

[0014] An average length of the first edge layer of the first positive active material layer in the one side direction may be longer than an average length of the second edge layer of the second negative active material layer in the one side direction.

[0015] A ratio of the average length of the first edge layer of the first positive active material layer in the one side direction to the average length of the second edge layer of the second negative active material layer in the one side direction may be 1.2:1 to 2:1.

[0016] An average length of the first edge layer of the first negative active material layer in the other side direction may be longer than an average length of the second edge layer of the second positive active material layer in the other side direction.

[0017] A ratio of the average length of the first edge layer of the first negative active material layer in the other side direction to the average length of the second edge layer of the second positive active material layer in the other side direction may be 1.2:1 to 2:1.

[0018] The first edge layer and the second edge layer may have a thickness less than or equal to 1.0×10 -10 Ionic conductivity of S / cm.

[0019] The first edge layer and the second edge layer may include an electrolyte material or an insulating material.

[0020] The solid electrolyte layer may include an inorganic solid electrolyte including an oxide-based solid electrolyte, a sulfide-based solid electrolyte, or a combination thereof.

[0021] The all-solid-state battery may also include a third unit cell, the third unit cell including: a second positive electrode active material layer, including a second edge layer in the one side direction and the other side direction; a second negative electrode active material layer, including a second edge layer in the one side direction and the other side direction; and a solid electrolyte layer, arranged between the second positive electrode active material layer and the second negative electrode active material layer in the stacking direction, and the third unit cell may be arranged between the first unit cell and the second unit cell.

[0022] The third unit cell may be connected in series to the first unit cell and the second unit cell, respectively.

[0023] The all-solid-state battery may further include a first external electrode and a second external electrode, the first external electrode being disposed on the second side surface, and the second external electrode being disposed on the first side surface.

[0024] The all-solid-state battery may further include a current collecting layer disposed adjacent to the first positive electrode active material layer in the stacking direction. The current collecting layer may extend in a lateral direction and be connected to the second external electrode. The all-solid-state battery may further include another current collecting layer disposed adjacent to the first negative electrode active material layer in the stacking direction. The current collecting layer extends in a lateral direction and is connected to the first external electrode.

[0025] According to another embodiment, an all-solid-state battery has a first side surface and a second side surface facing each other, and includes: a first unit cell, including a first positive electrode active material layer, a second negative electrode active material layer and a solid electrolyte layer, the first positive electrode active material layer including a first edge layer in a side direction close to the first side surface, the second negative electrode active material layer including a second edge layer in the one side direction and the other side direction, and the solid electrolyte layer is arranged between the first positive electrode active material layer and the second negative electrode active material layer in the stacking direction; and a second unit cell, including a second positive electrode active material layer, a first negative electrode active material layer and a solid electrolyte layer, the second positive electrode active material layer including a second edge layer in the one side direction and the other side direction, the first negative electrode active material layer including a first edge layer in the other side direction close to the second side surface, and the solid electrolyte layer is arranged between the second positive electrode active material layer and the first negative electrode active material layer in the stacking direction, wherein the all-solid-state battery includes two or more unit cells in which the first unit cell and the second unit cell are connected in series.

[0026] The unit cells may be connected in parallel.

[0027] In the unit cell, each of the first positive electrode active material layers may be disposed adjacent to each other in the stacking direction with a current collecting layer interposed therebetween.

[0028] In the unit cell, each of the first negative electrode active material layers may be disposed adjacent to each other in the stacking direction with a current collecting layer interposed therebetween.

[0029] The first positive active material layer of each of the unit cells may be wider than the current collecting layer and may be connected to each other while surrounding an edge of the current collecting layer.

[0030] The first negative active material layer of each of the unit cells may be wider than the current collecting layer and may be connected to each other while surrounding an edge of the current collecting layer.

[0031] In the unit cell, each of the first positive electrode active material layers may be disposed adjacent to each other in the stacking direction.

[0032] In the unit cell, each of the first negative active material layers may be disposed adjacent to each other in the stacking direction.

[0033] According to another embodiment, an all-solid-state battery has a first outer electrode and a second outer electrode spaced apart from each other and one or more unit cells, each of which includes: an inner current collecting layer spaced apart from the first outer electrode and the second outer electrode; a second negative electrode active material layer disposed on one surface of the inner current collecting layer; a second positive electrode active material layer disposed on the other surface of the inner current collecting layer opposite to the one surface of the inner current collecting layer; a first solid electrolyte layer, a first positive electrode active material layer, and a first current collecting layer, sequentially disposed on the second negative electrode active material layer; and a second solid electrolyte layer, a first negative electrode active material layer, and a second current collecting layer, sequentially disposed on the second positive electrode active material layer. The first current collecting layer may be connected to the first outer electrode, and the second current collecting layer may be connected to the second outer electrode. The inner current collecting layer may be closer to the first outer electrode than the second current collecting layer, and may be closer to the second outer electrode than the first current collecting layer.

[0034] The one or more unit cells include a first unit cell and a second unit cell, which are stacked on each other such that the second current collecting layer of the first unit cell is identical to the second current collecting layer of the second unit cell.

[0035] Each unit cell may further include: another solid electrolyte layer, another positive electrode active material layer, and another inner current collecting layer sequentially disposed between the second positive electrode active material layer and the second solid electrolyte layer. The another inner current collecting layer may be spaced apart from the first outer electrode and the second outer electrode.

[0036] The second current collecting layer may include: one end connected to the second external electrode; and the other end opposite to the one end and covered by the first negative active material layer.

[0037] Advantageous Effects of the Invention

[0038] According to the all-solid-state battery according to the embodiment, a high-voltage battery can be realized.

[0039] Furthermore, by overcoming the limitations of material combinations caused by reactivity between materials or simultaneous sintering conditions, the range of material selection can be expanded, and battery stability and process margin can be widened. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic cross-sectional view of an all-solid-state battery according to an embodiment.

[0041] Figure 2 It is a schematic diagram showing the Figure 1 An exploded perspective view of a unit cell stacking structure of an all-solid-state battery of the embodiment shown in FIG.

[0042] Figure 3 is a schematic cross-sectional view of an all-solid-state battery according to another embodiment.

[0043] Figure 4 is a schematic cross-sectional view of an all-solid-state battery according to another embodiment.

[0044] Figure 5 is a schematic cross-sectional view of an all-solid-state battery according to another embodiment.

[0045] Figure 6 is a schematic cross-sectional view of an all-solid-state battery according to another embodiment.

[0046] Figure 7 is a schematic cross-sectional view of an all-solid-state battery according to another embodiment.

[0047] Figure 8 is a schematic cross-sectional view of an all-solid-state battery according to another embodiment. DETAILED DESCRIPTION

[0048] Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily perform the present invention. The accompanying drawings and descriptions are considered to be illustrative rather than restrictive in nature. Throughout the specification, the same reference numerals represent the same elements.

[0049] In addition, the drawings are provided only to make the embodiments disclosed in this specification easy to understand, and the drawings are not interpreted as limiting the spirit disclosed in this specification, and it should be understood that the present invention includes all modifications, equivalents and substitutions without departing from the scope and spirit of the present invention. In addition, some constituent elements in the drawings are exaggerated, omitted or schematically described, and the size of each constituent element does not fully reflect the actual size.

[0050] In addition, unless explicitly described to the contrary, the word “comprise” and variations such as “including” or “having”, will be understood to imply the inclusion of stated elements but not the exclusion of any other elements.

[0051] Throughout the specification, "stacking direction" refers to the direction in which constituent elements are sequentially stacked or the "thickness direction" perpendicular to the large surface (main surface) of the sheet-like constituent element, which corresponds to the T-axis direction in the drawings. In addition, "lateral direction" refers to the direction extending from the edge of the sheet-like constituent element in parallel to the large surface (main surface) or the "plane direction", which corresponds to the L-axis direction in the drawings.

[0052] Hereinafter, various embodiments and modifications will be described in detail with reference to the accompanying drawings.

[0053] Figure 1 is a schematic cross-sectional view of an all-solid-state battery according to an embodiment.

[0054] Reference Figure 1 , for example, the all-solid-state battery 100 may have a substantially hexahedral shape.

[0055] In this example embodiment, for ease of description, in the all-solid-state battery 100, two surfaces facing each other in the thickness direction (T-axis direction) are defined as the first surface and the second surface, and two surfaces connected to the first surface and the second surface and facing each other in the length direction (L-axis direction) are defined as the third surface and the fourth surface. For example, the first side surface and the second side surface of the all-solid-state battery 100 may be the third surface and the fourth surface.

[0056] The all-solid-state battery 100 according to the present embodiment includes a first unit cell 101 and a second unit cell 102 .

[0057] The first unit cell 101 includes a first positive electrode active material layer 121 , a second negative electrode active material layer 142 , and a solid electrolyte layer 130 disposed between the first positive electrode active material layer 121 and the second negative electrode active material layer 142 in the stacking direction.

[0058] The second unit cell 102 includes a second positive electrode active material layer 122 , a first negative electrode active material layer 141 , and a solid electrolyte layer 130 disposed between the second positive electrode active material layer 122 and the first negative electrode active material layer 141 in the stacking direction.

[0059] The first positive active material layer 121 may be formed by coating a positive active material on one surface of the current collecting layer 161 , and the first negative active material layer 141 may be formed by coating a negative active material on one surface of the current collecting layer 161 .

[0060] In addition, the second positive active material layer 122 may be formed by coating a positive active material on one surface of the inner current collecting layer 162 , and the second negative active material layer 142 may be formed by coating a negative active material on the other surface of the inner current collecting layer 162 .

[0061] For example, the first positive electrode active material layer 121 at the uppermost end in the stacking direction is disposed on the lower surface of the current collecting layer 161, and the first negative electrode active material layer 141 at the lowermost end is disposed on the upper surface of another current collecting layer 161. In addition, in the case where the electrode layer is located between the uppermost end and the lowermost end, the second positive electrode active material layer 122 and the second negative electrode active material layer 142 may be disposed on both side surfaces of the inner current collecting layer 162, respectively.

[0062] For example, the positive electrode active material is not particularly limited as long as it can ensure sufficient capacity of the all-solid-state battery 100. For example, the positive electrode active material may include lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium iron phosphate, lithium manganese oxide, or a combination thereof.

[0063] For example, the positive electrode active material may be a compound represented by the following chemical formula: Li a A 1-b M b D2 (where 0.90≤a≤1.8, 0≤b≤0.5); Li a E 1-b M b O 2-c D c (where 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); LiE 2- b M b O 4-c D c (where 0≤b≤0.5, 0≤c≤0.05); Li a Ni 1-b-c Co b M c O 4-c D α (where 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05, 0<α≤2); Li a Ni 1-b-c Co b M c O 2-α X α (where 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05, 0<α<2); Li a Ni 1-b-c Co b M c O 2-α X2 (where 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05, 0<α<2); Li a Ni 1-b-c Mn b M c D α (where 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05, 0<α≤2); Li a Ni 1-b-c Mn b M c O 2-α X α(where 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05, 0<α<2); Li a Ni 1-b-c Mn b M c O 2-α X2 (where 0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05, 0<α<2); Li a Ni b E c G d O2 (where 0.90≤a≤1.8, 0≤b≤0.9, 0≤c≤0.5, 0.001≤d≤0.1); Li a Ni b Co c Mn d GeO2 (where 0.90≤a≤1.8, 0≤b≤0.9, 0≤c≤0.5, 0≤d≤0.5, 0.001≤e≤0.1); Li a NiGbO2 (where 0.90≤a≤1.8, 0.001≤b≤0.1); Li a CoGbO2 (where 0.90≤a≤1.8, 0.001≤b≤0.1); Li a MnGbO2 (where 0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn2GbO4 (where 0.90≤a≤1.8, 0.001≤b≤0.1); QO2; QS2; LiQS2; V2O5; LiV2O2; LiRO2; LiNiVO4; Li (3-f) J2(PO4)3(0≤f≤2);Li (3-f) Fe2(PO4)3 (where 0≤f≤2); and LiFePO4, wherein, in the above chemical formula, A is Ni, Co or Mn; M is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V or a rare earth element; D is O, F, S or P; E is Co or Mn; X is F, S or P; G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr or V; Q is Ti, Mo or Mn; R is Cr, V, Fe, Sc or Y; and J is V, Cr, Mn, Co, Ni or Cu.

[0064] The positive electrode active material can also be LiCoO2, LiMn x O 2x (where x=1 or 2), LiNi 1-x Mn x O 2x (Among them, 0 <x<1)、LiNi 1-x-yCo x Mn y O2 (wherein 0≤x≤0.5, 0≤y≤0.5), LiFePO4, TiS2, FeS2, TiS3 or FeS3.

[0065] Optionally, the positive electrode active material may include a conductive agent and a binder.

[0066] The conductive agent is not particularly limited as long as it has conductivity without causing chemical changes in the all-solid-state battery 100. For example, examples of the conductive agent may include: graphite, such as natural graphite and artificial graphite; carbon-based substances, such as carbon black, acetylene black, Ketjen black, channel black, furnace black, coal black, and summer black; conductive fibers, such as carbon fibers and metal fibers; carbon fluoride; metal powders, such as aluminum powder and nickel powder; conductive whiskers, such as zinc oxide and potassium titanate; conductive metal oxides, such as titanium oxide; or conductive materials, such as polyphenylene derivatives.

[0067] The conductive agent may be included in an amount of 1 to 10 parts by weight (eg, 2 to 5 parts by weight) based on 100 parts by weight of the positive electrode active material. When the conductive agent is included in an amount within the above range, the final electrode may have excellent conductive properties.

[0068] The binder can be used to improve the bonding strength between the active material and the conductive agent. The binder may include polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinyl pyrrolidone, polytetrafluoroethylene, polyethylene, polypropylene, ethylene propylene diene copolymer (EDPM), sulfonated EDPM, styrene butadiene rubber, fluororubber or various copolymers.

[0069] The binder may be included in an amount of 1 to 50 parts by weight (eg, 2 to 5 parts by weight) based on 100 parts by weight of the total positive active material. When the binder content satisfies the above range, the active material layer may have high binding strength.

[0070] A porous material such as a net or mesh shape may be used as the current collecting layer 161, and a porous metal plate such as stainless steel, nickel or aluminum may be used. In addition, the current collecting layer 161 may be coated with an anti-oxidation metal film or alloy film to prevent oxidation.

[0071] The negative electrode active material may be a carbon-based material, silicon, silicon oxide, silicon-based alloy, silicon-carbon-based material composite, tin, tin-based alloy, tin-carbon composite, metal oxide, or a combination thereof, and may include lithium metal and / or lithium metal alloy.

[0072] The lithium metal alloy may include lithium and a metal / metalloid capable of alloying with lithium. For example, the metal / metalloid capable of alloying with lithium may include Si, Sn, Al, Ge, Pb, Bi, Sb, Si-Y alloy (where Y is an alkali metal, alkaline earth metal, group 13 to 16 element, transition metal, rare earth element, or a combination thereof, and does not include Si), Sn-Y alloy (where Y is an alkali metal, alkaline earth metal, group 13 to 16 element, transition metal, or a transition metal oxide such as lithium titanate (Li4Ti5O 12 ), rare earth element, or a combination thereof, and does not include Sn), or MnO x (0 < x ≤ 2).

[0073] The element Y may be 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.

[0074] In addition, the oxide of the metal / metalloid capable of alloying with lithium may be lithium titanate, vanadium oxide, lithium vanadium oxide, SnO2, SiO x (0 < x < 2), etc. For example, the negative electrode active material may include one or more elements selected from the elements of groups 13 to 16 of the periodic table. For example, the negative electrode active material may include one or more elements selected from the group consisting of Si, Ge, and Sn.

[0075] The carbon-based material may be crystalline carbon, amorphous carbon, or a mixture thereof. The crystalline carbon may include graphite, such as natural graphite or artificial graphite in an amorphous form, plate form, flake form, spherical form, or fiber form. In addition, the amorphous carbon may include soft carbon (low-temperature calcined carbon) or hard carbon, mesophase pitch carbonization product, calcined coke, graphene, carbon black, fullerene soot, carbon nanotube, carbon fiber, etc.

[0076] Silicon may be Si, SiO x (0 < x < 2, for example 0.5 to 1.5), Sn, SnO2, a silicon-containing metal alloy, or a mixture 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, as well as silicon.

[0077] Optionally, the negative electrode active material layer may further include a conductive agent and a binder as described in the positive electrode active material layer.

[0078] The solid electrolyte layer 130 can be disposed and stacked between the first positive electrode active material layer 121 and the second negative electrode active material layer 142, or can be disposed and stacked between the second positive electrode active material layer 122 and the first negative electrode active material layer 141.

[0079] Therefore, the solid electrolyte layer 130 can be disposed adjacent to each other in the stacking direction between the first positive electrode active material layer 121 and the second negative electrode active material layer 142, and can be disposed adjacent to each other in the stacking direction between the second positive electrode active material layer 122 and the first negative electrode active material layer 141.

[0080] Therefore, in the all-solid-state battery 100, a plurality of positive electrode active material layers and a plurality of negative electrode active material layers can be alternately disposed, and a plurality of solid electrolyte layers can be interposed and stacked between the plurality of positive electrode active material layers and the plurality of negative electrode active material layers. The all-solid-state battery 100 is a multi-layer solid-state battery 100 manufactured by alternately stacking a plurality of positive electrode active material layers and a plurality of negative electrode active material layers and interposing a plurality of solid electrolyte layers therebetween to provide a battery stack, and then co-firing them.

[0081] The solid electrolyte layer 130 can include an inorganic solid electrolyte, and the inorganic solid electrolyte includes an oxide-based solid electrolyte, a sulfide-based solid electrolyte, or a combination thereof.

[0082] The oxide-based solid electrolyte can be a garnet-type electrolyte, a sodium superionic conductor (NASICON)-type electrolyte, a lithium superionic conductor (LISICON)-type electrolyte, a perovskite-type electrolyte, a lithium phosphorus oxynitride (LiPON)-type electrolyte, or an amorphous (glass) electrolyte.

[0083] The garnet-based solid electrolyte can include lithium lanthanum zirconium oxide (LLZO) represented by Li a La b Zr c O 12 such as Li7La3Zr2O 12 ), and the sodium superionic conductor (NASICON)-based solid electrolyte can include introducing Ti into Li 1+x Al x M 2-x (PO4)3 (LAMP) (0 < x < 2, M is Zr, Ti or Ge) type compound lithium aluminum titanium phosphate (LATP) (Li 1+x Al x Ti 2-x (PO4)3 (0 < x < 1)), and by Li 1+x Al x Ge 2-xLithium germanium aluminum phosphate (LAGP) represented by (PO4)3 (0 < x < 1) (such as Li 1.3 Al 0.3 Ti 1.7 (PO4)3) and / or lithium zirconium phosphate (LZP) (LiZr2(PO4)3).

[0084] In addition, lithium superionic conductor (LISICON)-based solid electrolytes may include solid solution oxides represented by xLi3AO4-(1-x)Li4BO4 (where A is P, As or V, and B is Si, Ge or Ti), such as Li4Zn(GeO4)4, Li 10 GeP2O 12 (LGPO), Li 3.5 Si 0.5 P 0.5 O4 or Li 10.42 Si(Ge) 1.5 P 1.5 Cl 0.08 O 11.92 , or solid solution sulfides represented by Li 4-x M 1-y M' y S4 (where M is Si or Ge, and M' is P, Al, Zn or Ga), such as Li2S-P2S5, Li2S-SiS2, Li2S-SiS2-P2S5 or Li2S-GeS2.

[0085] Perovskite-based solid electrolytes may include lithium lanthanum titanate (LLTO) represented by Li 3x La 2 / 3x □ 1 / 3-2x TiO3 (0 < x < 0.16, □: vacancy), such as Li 1 / 8 La 5 / 8 TiO3. Lithium phosphorus oxynitride (LiPON)-based solid electrolytes may include lithium phosphorus oxynitrides, such as Li 2.8 PO 3.3 N 0.46 .

[0086] Examples of amorphous electrolytes include Li2O-B2O3-SiO2, Li2O-B2O3-P2O5, Li3BO3-Li2SO4 or Li3BO3-Li2CO3.

[0087] Sulfide-based solid electrolytes may include sulfur atoms among the electrolyte components and are not limited to specific components, and may include one or more of crystalline solid electrolytes, amorphous solid electrolytes (glass-like solid electrolytes) or glass-ceramic solid electrolytes.

[0088] For example, the sulfide-based solid electrolyte may include an LPS-type sulfide containing sulfur and phosphorus (e.g., Li2S-P2S5), or may include a sulfide-based LISICON-type compound Li 4-x Ge 1-x P x S4 (x is 0.1 to 2, or x is 3 / 4, or 2 / 3), Li 10± 1MP2X 12 (M is Ge, Si, Sn or Al, and X is S or Se), Li 3.833 Sn 0.833 As 0.166 S4, Li4SnS4, Li 3.25 Ge 0.25 P 0.75 S4, Li2S-P2S5, B2S3-Li2S, xLi2S-100-xP2S5 (x is 70 to 80), Li2S-SiS2-Li3N, Li2S-P2S5-LiI, Li2S-SiS2-LiI, Li2S-B2S3-LiI, Li 10 SnP2S 12 or Li 3.25 Ge 0.25 P 0.75 S4.

[0089] The solid electrolyte may have a value greater than or equal to about 1×10 -3 S / cm ionic conductivity. The ionic conductivity can be measured at a temperature of 25°C. The ionic conductivity can be greater than or equal to 1×10 -3 S / cm, 2×10 -3 S / cm, greater than or equal to 3×10 -3 S / cm, greater than or equal to 4×10 -3 S / cm or greater than or equal to 5×10 -3 S / cm, and the upper limit of the ion conductivity is not particularly limited. When a solid electrolyte satisfying the range of ion conductivity is used, the all-solid-state battery 100 can exhibit high output.

[0090] The first edge layer 151 may be disposed along edges of the first positive active material layer 121 and the first negative active material layer 141 , and the second edge layer 152 may be disposed along edges of the second positive active material layer 122 and the second negative active material layer 142 .

[0091] The first edge layer 151 may be disposed on the solid electrolyte layer 130 and adjacent to an edge of the first positive electrode active material layer 121 or an edge of the first negative electrode active material layer 141 in one side direction, and the second edge layer 152 may be disposed on the solid electrolyte layer 130 and adjacent to an edge of the second positive electrode active material layer 122 or an edge of the second negative electrode active material layer 142 in one side direction.

[0092] Therefore, the first edge layer 151 may be disposed on the same layer as the first positive active material layer 121 or the first negative active material layer 141 , and the second edge layer 152 may be disposed on the same layer as the second positive active material layer 122 or the second negative active material layer 142 .

[0093] The first edge layer 151 and the second edge layer 155 may include a layer having a thickness less than or equal to 1.0×10 -10 The insulating material having an ion conductivity of 0.1 S / cm includes, for example, the aforementioned solid electrolyte material or an insulating material such as a resin.

[0094] For example, the insulating material may be polyolefin (such as polyethylene or polypropylene), polyester (such as polyethylene terephthalate (PET)), polyurethane, polyimide, or the like.

[0095] In addition, the first edge layer 151 and the second edge layer 152 may include an inorganic solid electrolyte including an oxide-based solid electrolyte, a sulfide-based solid electrolyte, or a combination thereof used in the solid electrolyte layer 130. However, the first edge layer 151 and the second edge layer 152 are not limited thereto but may include various materials.

[0096] A first unit cell 101 including a first positive electrode active material layer 121, a solid electrolyte layer 130 and a second negative electrode active material layer 142 is stacked with a second unit cell 102 including a second positive electrode active material layer 122, a solid electrolyte layer 130 and a first negative electrode active material layer 141 to constitute a battery stack of the all-solid-state battery 100.

[0097] The first unit cell 101 and the second unit cell 102 may be connected in series.

[0098] Herein, the second negative electrode active material layer 142 of the first unit cell 101 and the second positive electrode active material layer 122 of the second unit cell 102 may be disposed adjacent to each other in the stacking direction with the inner current collecting layer 162 interposed therebetween.

[0099] A protective layer made of an insulating material may be formed on the upper and lower ends of the battery stack of the all-solid-state battery 100 .

[0100] In addition, the terminal of the current collecting layer 161 adjacent to the first positive active material layer 121 and the terminal of the current collecting layer 161 adjacent to the first negative active material layer 141 are respectively exposed on both sides of the battery stack of the all-solid-state battery 100, and the first external electrode 172 and the second external electrode 174 may be respectively connected to and bonded to these exposed terminals. In other words, the first external electrode 172 may be configured to be connected to the terminal of the current collecting layer 161 adjacent to the first positive active material layer 121 to form a positive electrode, and the second external electrode 174 may be configured to be connected to the terminal of the current collecting layer 161 adjacent to the first negative active material layer 141 and form a negative electrode. The terminal of the current collecting layer 161 adjacent to the first positive active material layer 121 and the terminal of the current collecting layer 161 adjacent to the first negative active material layer 141 are configured to face each other in opposite directions, so that the first external electrode 172 and the second external electrode 174 may also be respectively disposed on both sides.

[0101] The first and second external electrodes 173 and 174 may include conductive metal and glass.

[0102] For example, the conductive metal may include copper (Cu), nickel (Ni), tin (Sn), palladium (Pd), platinum (Pt), gold (Au), silver (Ag), tungsten (W), titanium (Ti), lead (Pb), or alloys thereof.

[0103] The glass component included in the first external electrode 172 and the second external electrode 174 may have a composition mixed with an oxide. For example, the glass component may include silicon oxide, boron oxide, aluminum oxide, transition metal oxide, alkali metal oxide, alkaline earth metal oxide, or a combination thereof. Herein, the transition metal may be selected from zinc (Zn), titanium (Ti), copper (Cu), vanadium (V), manganese (Mn), iron (Fe), or nickel (Ni), the alkali metal may be selected from lithium (Li), sodium (Na), or potassium (K), and the alkaline earth metal may be selected from magnesium (Mg), calcium (Ca), strontium (Sr), or barium (Ba).

[0104] The method of forming the first external electrode 172 and the second external electrode 174 is not particularly limited. For example, the method may include immersing the battery stack in a conductive paste including a conductive metal and glass, or screen printing or gravure printing the conductive paste on the surface of the battery stack. In addition, various methods of coating the conductive paste on the surface of the battery stack or transferring the dry film obtained by drying the conductive paste onto the battery stack may be used.

[0105] Figure 2 It is schematically shown Figure 1 An exploded perspective view of a unit cell stacking structure of an all-solid-state battery according to an embodiment is shown in FIG.

[0106] Reference Figure 2, the first edge layer 151 may be disposed on one side direction (close to the first side surface (third surface)) of the first positive active material layer 121. In addition, the first edge layer 151 may also be disposed on both side directions in the W-axis direction of the first positive active material layer 121. Therefore, the first edge layer 151 may be disposed along the edge of the first positive active material layer 121.

[0107] The first positive electrode active material layer 121 may extend in a side direction close to the second side surface (fourth surface), for example, to an end of a side direction (close to the second side surface (fourth surface)) of the solid electrolyte layer 130. Therefore, the first edge layer 151 may not be disposed on a side direction (close to the second side surface (fourth surface)) of the first positive electrode active material layer 121.

[0108] The second edge layer 152 may be disposed in one side direction and the other side direction of the second negative electrode active material layer 142 in the L-axis direction. In addition, the second edge layer 152 may also be disposed in both side directions of the second negative electrode active material layer 142 in the W-axis direction. For example, the second negative electrode active material layer 142 does not extend in one side direction or the other side direction in the L-axis direction, but may be disposed only in the central region of the solid electrolyte layer 130 except for the edge. Therefore, the second edge layer 152 may be disposed along all edges of the second negative electrode active material layer 142.

[0109] Similarly, the second positive electrode active material layer 122 may be provided in one side direction and the other side direction of the second edge layer 152 in the L-axis direction. In addition, the second edge layer 152 may also be provided in both side directions of the second positive electrode active material layer 122 in the W-axis direction. For example, the second positive electrode active material layer 122 does not extend in one side direction or the other side direction in the L-axis direction, but may be provided only in the central region of the solid electrolyte layer 130 except for the edge. Therefore, the second edge layer 152 may be provided at all edges of the second positive electrode active material layer 122.

[0110] When the inner current collecting layer 162 is disposed between the second negative electrode active material layer 142 and the second positive electrode active material layer 122, the second edge layer 152 may also be disposed in one side direction and the other side direction of the L-axis direction of the inner current collecting layer 162. In addition, the second edge layer 152 may be disposed at both side directions of the W-axis direction of the inner current collecting layer 162. For example, the inner current collecting layer 162 does not extend in one side direction or the other side direction of the L-axis direction, but may be disposed only in the central region of the solid electrolyte layer 130 except for the edge. Therefore, the second edge layer 152 may be disposed along all edges of the inner current collecting layer 162.

[0111] The all-solid-state battery 100 may include an inner electrode stacked with a second positive electrode active material layer 122, an inner current collecting layer 162, and a second negative electrode active material layer 142. All edges of the inner electrode may be surrounded by a second edge layer 152. The inner electrode is located in the central region of the solid electrolyte layer 130 without being offset to either side, reducing the mismatch between the positive electrode and the negative electrode, thereby suppressing current concentration according to the linear movement of Li ions along the T-axis direction.

[0112] On the other hand, the first edge layer 151 may be disposed on the side direction (close to the second side surface (fourth surface)) of the first negative active material layer 141. In addition, the first edge layer 151 may also be disposed on both side directions of the first negative active material layer 141 in the W-axis direction. Therefore, the first edge layer 151 may be disposed along the edge of the first negative active material layer 141.

[0113] The first negative electrode active material layer 141 may extend in a side direction close to the first side surface (third surface), for example, an end portion of a side direction (close to the first side surface (third surface)) of the solid electrolyte layer 130. Therefore, the first edge layer 151 may not be disposed along a side direction (close to the first side surface (third surface)) of the first negative electrode active material layer 141.

[0114] An average length L1 of the first edge layer 151 in a lateral direction (L-axis direction) close to the first side surface (third surface) may be longer than an average length L2 of the second edge layer 152 in a lateral direction (L-axis direction) close to the first side surface (third surface).

[0115] For example, the ratio of the average length L1 of the first edge layer 151 in a lateral direction (L-axis direction) close to the first side surface (third surface) and the average length L2 of the second edge layer 152 in a lateral direction (L-axis direction) close to the first side surface (third surface) can be 1.2:1 to 2:1, for example, 1.2:1 to 2:1, 1.5:1 to 2:1, 1.2:1 to 1.8:1, 1.5:1 to 1.8:1, 1.8:1 to 2:1 or 1.2:1 to 1.5:1.

[0116] Herein, the length of the first edge layer 151 can be determined by polishing the all-solid-state battery 100 until any first positive electrode active material layer 121 is exposed in a planar direction approximately perpendicular to the T-axis direction, and obtaining the maximum length of the first edge layer 151 in a side direction (L-axis direction) close to the first side surface (third surface) of the exposed first positive electrode active material layer 121.

[0117] The average length L1 of the first edge layers 151 may be an arithmetic mean of the lengths of any three, any five, or any ten first edge layers 151 respectively disposed on different first positive active material layers 121 .

[0118] In addition, the length of the second edge layer 152 can be determined by polishing the all-solid-state battery 100 until any second negative electrode active material layer 142 is exposed in a planar direction approximately perpendicular to the T-axis direction, and obtaining the maximum length of the first edge layer 151 in a lateral direction (L-axis direction) of the first side surface (third surface) close to the exposed second negative electrode active material layer 142.

[0119] The average length L2 of the second edge layers 152 may be an arithmetic mean of the lengths of any three, any five, or any ten second edge layers 152 respectively disposed on different second negative electrode active material layers 142 .

[0120] When the average length L1 of the first edge layer 151 in a lateral direction (L-axis direction) close to the first side surface (third surface) is longer than the average length L2 of the second edge layer 152 in a lateral direction (L-axis direction) close to the first side surface (third surface), current concentration may be serious due to the linear movement of Li ions along the T-axis direction, but the second negative electrode active material layer 142 is not biased to one side, but is located in the central area of ​​the solid electrolyte layer 130, thereby reducing the mismatch between the positive electrode and the negative electrode and suppressing current concentration.

[0121] An average length L3 of the first edge layer 151 in one side direction (L-axis direction) may be longer than an average length L4 of the second edge layer 152 in one side direction close to the second side surface (fourth surface).

[0122] For example, the ratio of the average length L3 of the first edge layer 151 in a lateral direction (L-axis direction) close to the second side surface (fourth surface) and the average length L4 of the second edge layer 152 in a lateral direction (L-axis direction) close to the second side surface (fourth surface) can be 1.2:1 to 2:1, for example, 1.2:1 to 2:1, 1.5:1 to 2:1, 1.2:1 to 1.8:1, 1.5:1 to 1.8:1, 1.8:1 to 2:1 or 1.2:1 to 1.5:1.

[0123] Herein, the length of the first edge layer 151 can be determined by polishing the all-solid-state battery 100 until any first negative electrode active material layer 141 is exposed in a planar direction approximately perpendicular to the T-axis direction, and obtaining the maximum length of the first edge layer 151 in a side direction (L-axis direction) of one side surface (three surfaces) close to the exposed first negative electrode active material layer 141.

[0124] The average length L3 of the first edge layers 151 may be an arithmetic mean of the lengths of any three, five, or ten first edge layers 151 respectively disposed on different first negative electrode active material layers 141 .

[0125] In addition, the length of the second edge layer 152 can be determined by polishing the all-solid-state battery 100 until any second positive active material layer 122 is exposed in a planar direction substantially perpendicular to the T-axis direction and obtaining the maximum length of the second edge layer 152 .

[0126] The average length L4 of the second edge layers 152 may be an arithmetic mean of the lengths of any three, five, or ten second edge layers 152 respectively disposed on different second positive electrode active material layers 122 .

[0127] When the average length L3 of the first edge layer 151 in a lateral direction (L-axis direction) close to the second side surface (fourth surface) is longer than the average length L4 of the second edge layer 152 in a lateral direction (L-axis direction) close to the second side surface (fourth surface), the Li ions move in a straight line along the T-axis direction. When the second positive electrode active material layer 122 is tilted to one side, there may be severe current concentration, but since the second positive electrode active material layer 122 is not biased to one side but is disposed in the central area of ​​the solid electrolyte layer 130, the current concentration can be alleviated by reducing the mismatch between the positive electrode and the negative electrode.

[0128] According to the all-solid-state battery 100 according to the present embodiment, a high voltage battery can be realized. For example, when LFP (LiFePO4, 3.4V) positive electrode active material is combined with LTO (Li4Ti5O 12 , 1.5V) negative electrode active material combination, a low voltage of 1.9V can be obtained in the unit cell, but a voltage of 3.8V or more can be obtained according to the number of unit cells connected in series manufactured by applying the all-solid-state battery 100.

[0129] In addition, when LMO (LiMn2O4, 4.0V), LCO (LiCoO2, 3.8V to 4.0V) or LNMO (LiNi 0.5 Mn 1.5 When O4, 4.7V) positive electrode active material is combined with graphite (0.2V) negative electrode active material, since a voltage of about 4.0V can be obtained through a single unit cell, a battery greater than or equal to 12V is obtained by connecting three unit cells in series using the all-solid-state battery 100 manufactured according to this example embodiment.

[0130] In addition, since materials (such as LVP) that can be used as both positive electrode active materials (operating voltage: 3.6V to 4.1V) and negative electrode active materials (operating voltage: 1.7V to 2.0V) can obtain a maximum voltage of a unit cell of 2.9V, a high voltage battery can be manufactured by applying the all-solid-state battery 100 according to this example embodiment.

[0131] This all-solid-state battery 100 can be operated by being directly mounted on the power supply unit of the substrate like a passive device. In addition, the all-solid-state battery 100 occupies a local area and can be installed in an area having a desired shape. In addition, if necessary, several all-solid-state batteries 100 can be installed as long as the space in the device allows.

[0132] Figure 3 is a schematic cross-sectional view of an all-solid-state battery according to another embodiment.

[0133] Since the all-solid-state battery according to the present embodiment is similar to the aforementioned all-solid-state battery, repeated description will be omitted and the description will be focused on the differences.

[0134] exist Figure 3 In the embodiment shown in , the all-solid-state battery 100 further includes a third unit cell 103 located between the first unit cell 101 and the second unit cell 102 .

[0135] The third unit battery 103 includes: a second positive electrode active material layer 122, including a second edge layer 152 in one side direction and the other side direction of the L-axis direction; a second negative electrode active material layer 142, including a second edge layer 152 in one side direction and the other side direction of the L-axis direction; and a solid electrolyte layer 130, which is arranged adjacent to each other in the stacking direction between the second positive electrode active material layer 122 and the second negative electrode active material layer 142.

[0136] The third unit cell 103 may be connected in series with the first unit cell 101 and the second unit cell 102, respectively. Herein, the second negative electrode active material layer 142 of the first unit cell 101 and the second positive electrode active material layer 122 of the third unit cell 103 may be disposed adjacent to each other in the stacking direction with the inner current collecting layer 162 located in the middle, and the second negative electrode active material layer 142 of the third unit cell 103 and the second positive electrode active material layer 122 of the second unit cell 102 may be disposed adjacent to each other in the stacking direction with the inner current collecting layer 162 located in the middle.

[0137] In addition, the all-solid-state battery 100 may include a plurality of third cells 103, and each of the third cells 103 may be connected in series. In other words, in order to increase the voltage of the all-solid-state battery 100, as many third cells 103 as necessary may be connected in series.

[0138] Figures 4 to 8 is a schematic cross-sectional view of an all-solid-state battery according to another example embodiment.

[0139] Since the all-solid-state battery according to the present embodiment is similar to the aforementioned all-solid-state battery, repeated description will be omitted and the description will be focused on the differences.

[0140] exist Figure 4 and Figure 5 In the embodiment shown in , the all-solid-state battery 100 includes a first unit cell 111 in which the first unit cell 101 and the second unit cell 102 are connected in series and a second unit cell 112 in which the first unit cell 101 and the second unit cell 102 are connected in series.

[0141] The first unit cell 111 and the second unit cell 112 are connected in parallel.

[0142] Figure 4 A case is shown in which the first unit cell 111 and the second unit cell 112 are connected in parallel by disposing the first negative electrode active material layer 141 of each unit cell adjacent to each other with the current collecting layer 161 interposed therebetween in the stacking direction.

[0143] Figure 5 A case is shown in which the first unit cell 111 and the second unit cell 112 are connected in parallel by disposing the first positive electrode active material layer 121 of each unit cell adjacent to each other with the current collecting layer 161 interposed therebetween in the stacking direction.

[0144] Figure 6 1 shows a case where the first unit cell 111 and the second unit cell 112 are connected in parallel by arranging the first negative electrode active material layer 141 of each unit cell adjacent to each other in the stacking direction. Figure 4 In the embodiment, the first unit cell 111 and the second unit cell 112 are disposed adjacent to each other in the stacking direction by disposing the first negative electrode active material layer 141 of each unit cell with the current collecting layer 161 interposed therebetween, but in Figure 6 , the first unit cell 111 and the second unit cell 112 are disposed adjacent to each other in the stacking direction by disposing the first negative electrode active material layer 141 of each unit cell without the current collecting layer 161 interposed therebetween. Herein, the first negative electrode active material layer 141 of the first unit cell 111 and the first negative electrode active material layer 141 of the second unit cell 112 may be integrated to the extent that they are substantially indistinguishable.

[0145] In addition, if Figure 6As shown in , since the first unit cell 111 and the second unit cell 112 are connected in parallel by arranging the first positive electrode active material layer 121 to be adjacent to each other in the stacking direction, the first unit cell 111 and the second unit cell 112 can be connected in parallel by arranging the first positive electrode active material layer 121 to be adjacent to each other in the stacking direction without inserting the current collecting layer 161 therebetween.

[0146] When the current collecting layer is removed in a structure in which either the positive electrode or the negative electrode is biased to one side, it is difficult to remove the current collecting layer because the current concentration becomes more serious. On the other hand, as in the present example embodiment, when the inner electrode stacked with the second positive electrode active material layer 122, the inner current collecting layer 162, and the second negative electrode active material layer 142 is not biased to one side in the L-axis direction but is arranged in the central area of ​​the solid electrolyte layer 130, the mismatch of the positive electrode and the negative electrode can be reduced. Therefore, since the current concentration according to the linear movement of Li ions along the T-axis direction can be reduced, the current collecting layer may not be included in the present example embodiment.

[0147] Figure 7 It is shown that the first negative active material layers 141 of the first unit cell 111 and the second unit cell 112 are wider than the current collecting layer 161 and are thus connected to each other while surrounding the edge of the current collecting layer 161. In addition, the first positive active material layers 121 of the first unit cell 111 and the second unit cell 112 are wider than the current collecting layer 161 and are thus connected to each other while surrounding the edge of the current collecting layer 161.

[0148] In addition, the all-solid-state battery 100 may include two or more unit cells, and each of the unit cells may be connected in parallel to each other.

[0149] exist Figure 8 , the first unit cell 111 is connected in parallel with the second unit cell 112 , the third unit cell 113 is connected in parallel with the second unit cell 112 , and the fourth unit cell 114 is connected in parallel with the third unit cell 113 .

[0150] While the present invention has been described in conjunction with what are presently considered to be practical example embodiments, it should be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

[0151] <Description of Reference Numerals>

[0152] 100: All-solid-state battery

[0153] 101, 102, 103: first unit cell to third unit cell

[0154] 111, 112, 113, 114: first to fourth unit cells

[0155] 121, 122: first positive electrode active material layer and second positive electrode active material layer

[0156] 130: Solid electrolyte layer

[0157] 141, 142: first negative electrode active material layer and second negative electrode active material layer

[0158] 151, 152: first edge layer and second edge layer

[0159] 161: Collector layer

[0160] 162: Inner collector layer

[0161] 174, 172: first external electrode and second external electrode

[0162] Industrial Applicability

[0163] The present disclosure relates to an all-solid-state battery.

[0164] An aspect of an embodiment provides an all-solid-state battery capable of realizing a high-voltage battery.

Claims

1. An all-solid-state battery having a first side surface and a second side surface facing each other, and comprising: A first unit battery comprises: a first positive electrode active material layer including a first edge layer in a side direction close to the first side surface; a second negative electrode active material layer including a second edge layer in the one side direction and the other side direction; and a solid electrolyte layer disposed between the first positive electrode active material layer and the second negative electrode active material layer in a stacking direction; and A second unit battery, comprising: a second positive electrode active material layer including a second edge layer in the one side direction and the other side direction; a first negative electrode active material layer including a first edge layer in the other side direction close to the second side surface; and a solid electrolyte layer disposed between the second positive electrode active material layer and the first negative electrode active material layer in the stacking direction, The first unit battery and the second unit battery are connected in series.

2. The all-solid-state battery according to claim 1, wherein: The second negative active material layer of the first unit cell and the second positive active material layer of the second unit cell are disposed adjacent to each other in the stacking direction with an inner current collecting layer interposed therebetween.

3. The all-solid-state battery according to claim 2, wherein: The inner current collecting layer includes a second edge layer in the one side direction and the other side direction.

4. The all-solid-state battery according to claim 3, wherein: The second edge layer is disposed along an edge of one or more of the second positive electrode active material layer, the second negative electrode active material layer, and the inner current collecting layer.

5. The all-solid-state battery according to claim 1, wherein: An average length of the first edge layer of the first positive electrode active material layer in the one side direction is longer than an average length of the second edge layer of the second negative electrode active material layer in the one side direction.

6. The all-solid-state battery according to claim 5, wherein: A ratio of the average length of the first edge layer of the first positive active material layer in the one side direction to the average length of the second edge layer of the second negative active material layer in the one side direction is 1.2:1 to 2:

1.

7. The all-solid-state battery according to claim 1, wherein: An average length of the first edge layer of the first negative electrode active material layer in the other side direction is longer than an average length of the second edge layer of the second positive electrode active material layer in the other side direction.

8. The all-solid-state battery according to claim 7, wherein: A ratio of the average length of the first edge layer of the first negative active material layer in the other side direction to the average length of the second edge layer of the second positive active material layer in the other side direction is 1.2:1 to 2:

1.

9. The all-solid-state battery according to claim 1, wherein: The first edge layer and the second edge layer have a thickness less than or equal to 1.0×10 -10 Ionic conductivity of S / cm.

10. The all-solid-state battery according to claim 9, wherein: The first edge layer and the second edge layer include an electrolyte material or an insulating material.

11. The all-solid-state battery according to claim 1, wherein: The solid electrolyte layer includes an inorganic solid electrolyte including an oxide-based solid electrolyte, a sulfide-based solid electrolyte, or a combination thereof.

12. The all-solid-state battery according to claim 1, further comprising: A third unit battery, the third unit battery comprising: a second positive electrode active material layer including a second edge layer in the one side direction and the other side direction; a second negative electrode active material layer including a second edge layer in the one side direction and the other side direction; and a solid electrolyte layer disposed between the second positive electrode active material layer and the second negative electrode active material layer in the stacking direction, Wherein, the third unit battery is arranged between the first unit battery and the second unit battery.

13. The all-solid-state battery according to claim 12, wherein: The third unit cells are connected in series to the first unit cells and the second unit cells, respectively. 14 . The all-solid-state battery according to claim 1 , further comprising a first external electrode and a second external electrode, the first external electrode being disposed on the second side surface, and the second external electrode being disposed on the first side surface.

15. The all-solid-state battery according to claim 14, further comprising: a current collecting layer disposed adjacent to the first positive electrode active material layer in the stacking direction, wherein the current collecting layer extends in the one side direction and is connected to the second external electrode, and Another current collecting layer is disposed adjacent to the first negative electrode active material layer in the stacking direction, wherein the another current collecting layer extends in the one side direction and is connected to the first external electrode.

16. An all-solid-state battery having a first side surface and a second side surface facing each other, and comprising: a first unit cell, comprising a first positive electrode active material layer, a second negative electrode active material layer and a solid electrolyte layer, wherein the first positive electrode active material layer comprises a first edge layer in a side direction close to the first side surface, the second negative electrode active material layer comprises a second edge layer in the one side direction and in another side direction, and the solid electrolyte layer is disposed between the first positive electrode active material layer and the second negative electrode active material layer in a stacking direction, and a second unit battery, comprising a second positive electrode active material layer, a first negative electrode active material layer and a solid electrolyte layer, wherein the second positive electrode active material layer comprises a second edge layer in the one side direction and the other side direction, the first negative electrode active material layer comprises a first edge layer in the other side direction close to the second side surface, and the solid electrolyte layer is arranged between the second positive electrode active material layer and the first negative electrode active material layer in the stacking direction, Wherein, the all-solid-state battery includes two or more unit cells in which the first unit cell and the second unit cell are connected in series.

17. The all-solid-state battery according to claim 16, wherein: The unit cells are connected in parallel.

18. The all-solid-state battery according to claim 17, wherein: In the unit cell, each of the first positive electrode active material layers is disposed adjacent to each other in the stacking direction with a current collecting layer interposed therebetween, or In the unit cell, each of the first negative electrode active material layers is disposed adjacent to each other in the stacking direction with a current collecting layer interposed therebetween.

19. The all-solid-state battery according to claim 18, wherein: The first positive electrode active material layer or the first negative electrode active material layer of each of the unit cells is wider than the current collecting layer and are connected to each other while surrounding an edge of the current collecting layer.

20. The all-solid-state battery according to claim 17, wherein: In the unit cell, each of the first positive electrode active material layers is disposed adjacent to each other in the stacking direction, or In the unit cell, each of the first negative electrode active material layers is disposed adjacent to each other in the stacking direction.

21. An all-solid-state battery, comprising: a first external electrode and a second external electrode spaced apart from each other; and one or more unit cells, each comprising: an inner current collecting layer spaced apart from the first outer electrode and the second outer electrode; a second negative electrode active material layer disposed on one surface of the inner current collecting layer; a second positive electrode active material layer disposed on another surface of the inner current collecting layer opposite to the one surface of the inner current collecting layer; A first solid electrolyte layer, a first positive electrode active material layer and a first current collecting layer are sequentially disposed on the second negative electrode active material layer; and A second solid electrolyte layer, a first negative electrode active material layer, and a second current collector layer are sequentially disposed on the second positive electrode active material layer. wherein the first current collecting layer is connected to the first external electrode, and the second current collecting layer is connected to the second external electrode, and The inner current collecting layer is closer to the first outer electrode than the second current collecting layer, and closer to the second outer electrode than the first current collecting layer.

22. The all-solid-state battery according to claim 21, wherein: The one or more unit cells include a first unit cell and a second unit cell, which are stacked on each other such that the second current collecting layer of the first unit cell is identical to the second current collecting layer of the second unit cell.

23. The all-solid-state battery according to claim 21, wherein: Each unit cell also includes: Another solid electrolyte layer, another positive electrode active material layer and another inner current collecting layer are sequentially disposed between the second positive electrode active material layer and the second solid electrolyte layer, and The another inner current collecting layer is spaced apart from the first outer electrode and the second outer electrode.

24. The all-solid-state battery according to claim 21, wherein: The second current collecting layer includes: one end portion connected to the second external electrode; and the other end portion opposite to the one end portion and covered by the first negative electrode active material layer.

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