All-solid-state batteries

Abstract

This disclosure provides an all-solid-state battery, comprising: an electrode assembly including a laminate and an insulating member; the laminate including stacked solid electrolyte layers, a negative electrode layer, and a positive electrode layer, the solid electrolyte layer being intermediate between the negative electrode layer and the positive electrode layer; the laminate being wound around the insulating member such that one surface of the negative electrode layer and / or the positive electrode layer in the stacking direction of the laminate is parallel to the central axis of the insulating member; a negative terminal connected to the negative electrode layer; and a positive terminal connected to the positive electrode layer. When the direction of the central axis of the insulating member is a third direction, the negative terminal is disposed on one surface of the electrode assembly in the third direction, and the positive terminal is disposed on another surface of the electrode assembly in the third direction.

Description

Technical Field

[0001] This disclosure relates to an all-solid-state battery. Background Technology

[0002] Recently, the number of devices using electricity as an energy source has been increasing. With the proliferation of electrical devices (such as smartphones, portable cameras, laptop PCs, and electric vehicles), attention is growing towards energy storage devices that utilize electrochemical processes. Among various electrochemical devices, lithium-ion batteries, capable of charging and discharging, and possessing high operating voltage and extremely high energy density, have become a focus of attention.

[0003] Lithium-ion batteries are manufactured by applying materials capable of lithium-ion insertion and extraction to the positive and negative electrodes, injecting a liquid electrolyte between the positive and negative electrodes, and generating or consuming electricity through oxidation or reduction reactions involving the insertion and extraction of lithium ions in the positive and negative electrodes. Such lithium-ion batteries should be substantially stable within their operating voltage range and should possess the ability to migrate ions at a sufficiently high rate.

[0004] When liquid electrolytes (such as non-aqueous electrolytes) are used in such lithium-ion batteries, there are advantages such as high discharge capacity and high energy density. However, the problem with lithium-ion batteries is that it is difficult to achieve high voltages with them, and there is a high risk of electrolyte leakage, fire, and explosion.

[0005] To address the aforementioned issues, secondary batteries using solid electrolytes instead of liquid electrolytes have been proposed as an alternative. Solid electrolytes can be categorized into polymer-based solid electrolytes and ceramic-based solid electrolytes, with ceramic-based solid electrolytes exhibiting the advantage of high stability. However, in the case of ceramic-based solid electrolytes, high-temperature sintering is required during manufacturing, and to prevent defects caused by shrinkage during sintering, a significant margin must be created. In particular, in the case of spherical batteries, the positive and negative electrodes are typically connected using via electrodes, and in this case, ensuring sufficient capacity becomes difficult due to the potential waste of space caused by the presence of vias. Summary of the Invention

[0006] Technical issues

[0007] This summary is provided to introduce selected concepts in a simplified form, and these concepts are further described in the following detailed description. This summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to help determine the scope of the claimed subject matter.

[0008] One aspect of this disclosure is to provide an all-solid-state battery with increased space utilization.

[0009] One aspect of this disclosure is to provide an all-solid-state battery with increased capacity.

[0010] One aspect of this disclosure is to provide an all-solid-state battery that can reduce losses due to resistance.

[0011] One aspect of this disclosure is to provide an all-solid-state battery with improved productivity.

[0012] Technical solutions to solve technical problems

[0013] According to one aspect of this disclosure, an all-solid-state battery includes: an electrode assembly comprising a stack and an insulating member, the stack comprising stacked solid electrolyte layers, a negative electrode layer, and a positive electrode layer, the solid electrolyte layers being intermediate between the negative electrode layer and the positive electrode layer, the stack being wound around the insulating member such that one surface of the negative electrode layer and / or the positive electrode layer in the stacking direction of the stack is parallel to the central axis of the insulating member; a negative terminal connected to the negative electrode layer; and a positive terminal connected to the positive electrode layer. When the direction of the central axis of the insulating member is a third direction, the negative terminal is disposed on one surface of the electrode assembly in the third direction, and the positive terminal is disposed on another surface of the electrode assembly in the third direction.

[0014] According to another aspect of this disclosure, an all-solid-state battery includes: an electrode assembly comprising a stack and an insulating member, the stack comprising a stacked solid electrolyte layer and a negative electrode layer and a positive electrode layer, the solid electrolyte layer being disposed between the negative electrode layer and the positive electrode layer.

[0015] The laminate is wound around the insulating member such that the surface of the negative electrode layer or the positive electrode layer in the stacking direction of the laminate is parallel to the central axis of the insulating member. Furthermore, at least a portion of the negative electrode layer is exposed on one surface of the electrode assembly in the direction of the central axis of the insulating member, and at least a portion of the positive electrode layer is exposed on another surface of the electrode assembly in the direction of the central axis opposite to the one surface.

[0016] According to another aspect of this disclosure, an all-solid-state battery includes: an electrode assembly comprising a stack and an insulating member, the stack comprising stacked solid electrolyte layers, a negative electrode layer, and a positive electrode layer, the solid electrolyte layers being disposed between the negative electrode layers and the positive electrode layers; a negative terminal connected to the negative electrode layer; and a positive terminal connected to the positive electrode layer. The stack is wound around the insulating member such that a surface of the negative electrode layer or the positive electrode layer in the stacking direction of the stack is parallel to the central axis of the insulating member. The negative electrode layer comprises stacked negative electrode current collectors and negative electrode active materials, the negative electrode current collectors being disposed between the negative electrode active materials. The positive electrode layer comprises stacked positive electrode current collectors and positive electrode active materials, the positive electrode current collectors being disposed between the positive electrode active materials.

[0017] Beneficial effects of the invention

[0018] As described above, according to the embodiments, an all-solid-state battery with increased space utilization can be provided.

[0019] It can increase the capacity of all-solid-state batteries.

[0020] It is possible to provide an all-solid-state battery that can reduce losses due to resistance.

[0021] This could provide an all-solid-state battery with improved productivity. Attached Figure Description

[0022] The above and other aspects, features, and advantages of the present invention will become clearer from the following detailed description taken in conjunction with the accompanying drawings, in which:

[0023] Figure 1 This is a schematic perspective view of an all-solid-state battery according to an embodiment of the present disclosure;

[0024] Figure 2 yes Figure 1 Cross-sectional view;

[0025] Figure 3 yes Figure 1 A plan view of the electrode assembly of an all-solid-state battery;

[0026] Figure 4 This is a schematic plan view of an all-solid-state battery according to an embodiment of the present disclosure;

[0027] Figure 5 and Figure 6 This is a schematic diagram illustrating a process for manufacturing an all-solid-state battery according to embodiments of the present disclosure; and

[0028] Figure 7 This is an exploded perspective view showing a conventional all-solid-state battery. Detailed Implementation

[0029] The following detailed embodiments are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various modifications, variations, and equivalents of the methods, apparatus, and / or systems described herein will be readily understood by those skilled in the art. For example, the order of operations described herein is merely illustrative and is not limited to the order presented herein; changes that will be readily understood by those skilled in the art may be made, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of functions and constructions known to those skilled in the art may be omitted.

[0030] The features described herein may be implemented in various forms and are not to be construed as being limited to the examples described herein. Rather, the examples described herein have been provided so that this disclosure will be thorough and complete, and will fully express the scope of this disclosure to those skilled in the art.

[0031] It should be noted here that the use of the term "may" in relation to embodiments or examples (e.g., what an embodiment or example may include or implement) means that there exists at least one embodiment or example that includes or implements such features, and that all embodiments and examples are not limited thereto.

[0032] Throughout the specification, when an element such as a layer, region, or substrate is described as being "on" another element, "connected to" another element, or "bonded to" another element, that element may be directly "on" another element, directly "connected to" another element, or directly "bonded to" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, or "directly bonded to" another element, there are no other elements in between.

[0033] As used herein, the term “and / or” includes any one of the relevant listed items or any combination of any two or more items.

[0034] Although terms such as “first,” “second,” and “third” may be used herein to describe various components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts will not be limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teaching of the examples described herein, the first component, first assembly, first region, first layer, or first part referred to as the first component, first assembly, first region, first layer, or first part may also be referred to as the second component, second assembly, second region, second layer, or second part.

[0035] For ease of description, spatial relative terms such as “above,” “above,” “below,” and “under” are used herein to describe the relationship between one element and another as shown in the accompanying drawings. Such spatial relative terms are intended to include not only the orientation depicted in the drawings but also the different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “above” relative to another element will be “below” or “under” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relative terms used herein will be interpreted accordingly.

[0036] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well. The terms “comprising,” “including,” and “having” enumerate the presence of the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0037] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the accompanying drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings, but include changes in shape that occur during manufacturing.

[0038] The features of the examples described herein can be combined in various ways that will be readily understood after obtaining an understanding of the disclosure of this application. Furthermore, although the examples described herein have various configurations, other configurations that will be readily understood after obtaining an understanding of the disclosure of this application are possible.

[0039] The accompanying drawings may be drawn off-scale, and for clarity, illustration, and convenience, the relative sizes, proportions, and depictions of the elements in the drawings may be exaggerated.

[0040] In this specification, expressions such as “A and / or B”, “at least one of A and B” or “one or more of A and B” may include all of the following: (1) including at least one A, (2) including at least one B, and (3) including both at least one A and at least one B.

[0041] In the accompanying drawings, the X direction can be defined as a first direction, the L direction, or the length direction; the Y direction can be defined as a second direction, the W direction, or the width direction; and the Z direction can be defined as a third direction, the T direction, or the thickness direction.

[0042] An all-solid-state battery 100 is provided according to an embodiment. Figures 1 to 6 This is a schematic diagram illustrating an all-solid-state battery 100 according to an embodiment. (Refer to...) Figures 1 to 6 According to an embodiment, the all-solid-state battery 100 may include an electrode assembly 110, a negative terminal 131, and a positive terminal 132. The electrode assembly 110 includes a stack and an insulating member 123. The stack includes a stacked solid electrolyte layer 111, a negative electrode layer 121, and a positive electrode layer 122. The solid electrolyte layer 111 is located between the negative electrode layer 121 and the positive electrode layer 122. The electrode assembly 110 is constructed such that the stack is wound around the insulating member 123 such that one surface of the negative electrode layer 121 and / or the positive electrode layer 122 in the stacking direction is parallel to the central axis of the insulating member 123. The negative terminal 131 is connected to the negative electrode layer 121, and the positive terminal 132 is connected to the positive electrode layer 122.

[0043] In this configuration, when the direction of the central axis of the insulating member 123 (or the direction of the central axis) is referred to as the third direction, the negative terminal 131 may be disposed on one surface of the electrode assembly 110 in the third direction, and the positive terminal 132 may be disposed on another surface of the electrode assembly 110 in the third direction. The all-solid-state battery 100 of this embodiment may have a cylindrical shape due to the stacking of the solid electrolyte layer 111, the negative electrode layer 121, and the positive electrode layer 122 around the insulating member 123.

[0044] In existing cylindrical batteries, the negative electrode layer and the positive electrode layer are connected via via electrodes. In the case of existing all-solid-state batteries with a hexahedral shape and stacked negative and positive electrode layers, the negative and positive electrode layers can be led out from the electrode assembly, and external terminals can be directly attached to the leads. However, in the case of cylindrical batteries, when using such leads, there is a problem of contact degradation with external terminals; therefore, via electrodes are typically used to connect the negative and positive electrode layers.

[0045] Figure 7 The diagram schematically illustrates a prior art cylindrical battery using through-hole electrodes. (Refer to...) Figure 7 A negative via electrode 251 is provided to connect the negative electrode layer 221, and a positive via electrode 252 is provided to connect the positive electrode layer 222. To prevent short circuits, vias with opposite polarities should be ensured to pass through the negative electrode layer 221 and the positive electrode layer 222. However, the overlap area of ​​the negative electrode layer and the positive electrode layer reduces the area of ​​the via region, and specifically, in the case of a structure with multiple stacked negative electrode layers and multiple positive electrode layers, there is a problem that the capacity decreases proportionally to the number of vias.

[0046] In the case of the all-solid-state battery 100 according to an embodiment of the present disclosure, no via electrodes are used, and therefore no vias are provided. The all-solid-state battery 100 according to an embodiment of the present disclosure has a structure in which a laminate formed by stacking a solid electrolyte layer 111, a negative electrode layer 121, and a positive electrode layer 122 is wound around an insulating member 123. The all-solid-state battery 100 according to the embodiment has a structure in which the negative electrode layer 121 and the positive electrode layer 122 of the laminate are respectively led out from the electrode assembly 110 in opposite directions, so the electrode assembly 110 can have a cylindrical shape and the capacity can be increased without wasting space due to vias.

[0047] The electrode assembly 110 of the all-solid-state battery 100 according to the embodiment may include a stack, the stack including a solid electrolyte layer 111, a negative electrode layer 121 and a positive electrode layer 122.

[0048] In embodiments of this disclosure, the solid electrolyte layer 111 according to the embodiments may be at least one selected from the group consisting of garnet-type solid electrolyte, Nasicon-type solid electrolyte, LISICON-type solid electrolyte, perovskite-type solid electrolyte and LiPON-type solid electrolyte.

[0049] Garnet-type solid electrolytes can refer to those composed of Li a La b Zr c O 12 The term refers to lithium lanthanum zirconium oxide (LLZO), such as Li7La3Zr2O. 12 Nasicon-type solid electrolytes can refer to those based on Li. 1+x Al x M 2-x The introduction of Ti into Li-based compounds (PO4)3(LAMP)(0 < x < 2, M = Zr, Ti, Ge) 1+x Al x Ti 2-x Lithium aluminum titanium phosphate (LATP) represented by (PO4)3 (0 < x < 1) can also refer to lithium aluminum titanium phosphate with excess lithium introduced from Li 1+x Al x Ge 2-x (PO4)3(0<x<1)(e.g., Li 1.3 Al 0.3 Ge 1.7 Lithium aluminum germanium phosphate (LAGP) represented by (PO4)3, and / or lithium zirconium phosphate (LZP) represented by LiZr2(PO4)3.

[0050] In addition, the LISICON-type solid electrolyte may refer to: a solid solution oxide represented by xLi3AO4-(1-x)Li4BO4 (A: P, As, V, etc., B: Si, Ge, Ti, etc., 0<x<1) and including Li4Zn(GeO4)4, Li 10 GeP2O 12 (LGPO), Li 3.5 Si 0.5 P 0.5 O4, Li 10.42 Si(Ge) 1.5 P 1.5 Cl 0.08 O 11.92 and other solid solution oxides, and solid solution sulfides represented by Li 4-x M 1-y M' y S4 (M=Si, Ge and M'=P, Al, Zn, Ga, 0<x<4, 0<y<1), including Li2S-P2S5, Li2S-SiS2, Li2S-SiS2-P2S5, Li2S-GeS2 and other solid solution sulfides.

[0051] Perovskite-type solid electrolytes may refer to lithium-lanthanum-titanate oxides (lithium lanthanum titanate, LLTO) represented by Li 3x La 2 / 3-x □ 1 / 3-2x TiO3 (0<x<0.16, □ represents a vacancy) (such as Li 1 / 8 La 5 / 8 TiO3, etc.), and LiPON-type solid electrolytes may refer to nitrides, such as lithium phosphorus oxynitride represented by Li 2.8 PO 3.3 N 0.46 , etc.

[0052] The negative electrode layer 121 of the all-solid-state battery 100 according to an embodiment of the present disclosure may include a negative electrode current collector 121a and a negative active material 121b.

[0053] The negative electrode layer 121 included in the all-solid-state battery 100 according to the embodiment may include components known to be usable as negative active materials. As the negative active material 121b, carbon-based materials, silicon, silicon oxide, silicon-based alloys, silicon-carbon-based material composites, tin, tin-based alloys, tin-carbon composites, metal oxides or combinations thereof may be used, and may include lithium metal and / or lithium metal alloys.

[0054] The lithium metal alloy may include lithium and a metal / metalloid capable of being alloyed with lithium. For example, the metal / metalloid capable of being alloyed with lithium may be Si, Sn, Al, Ge, Pb, Bi, Sb, a Si-Y1 alloy (where Y1 is an alkali metal, an alkaline earth metal, a group 13 to 16 element, a transition metal, a rare earth element, or a combination thereof, and excludes Si), a Sn-Y1 alloy (where Y1 is an alkali metal, an alkaline earth metal, a group 13 to 16 element, a transition metal, a transition metal oxide such as lithium titanium oxide (Li4Ti5O 12 )), a rare earth element, or a combination thereof, and excludes Sn), MnO x (0<x<2), etc. 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 may be used as the element Y1.

[0055] In addition, the oxide of the metal / metalloid capable of being alloyed with lithium may be lithium titanium oxide, vanadium oxide, lithium vanadium oxide, SnO2, SiO x (0<x<2), etc. For example, the negative electrode active material may include at least one element selected from the group consisting of elements from 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.

[0056] The carbon-based material may be crystalline carbon, amorphous carbon, or a mixture thereof. The crystalline carbon may be graphite, such as amorphous, platy, flaky, spherical or fibrous natural graphite or artificial graphite. In addition, the amorphous carbon may be soft carbon (low-temperature calcined carbon) or hard carbon, mesophase pitch carbide, calcined coke, graphene, carbon black, fullerene soot, carbon nanotubes, carbon fibers, etc., but is not limited thereto.

[0057] The negative electrode active material may be selected from the group consisting of Si, SiO x (0<x<2, for example 0.5 to 1.5), Sn, SnO2 or silicon-containing metal alloys, and mixtures thereof. The silicon-containing metal alloy may include, for example, at least one of Al, Sn, Ag, Fe, Bi, Mg, Zn, In, Ge, Pb and Ti, and silicon.

[0058] Porous bodies (such as meshes or mesh-shaped materials) can be used as negative electrode current collectors 121a, and porous metal plates (such as stainless steel, nickel, copper, or aluminum) can be used as negative electrode current collectors, but are not limited thereto. Additionally, the negative electrode current collector can be coated with an antioxidant metal or alloy film to prevent oxidation.

[0059] The negative electrode active material 121b of the all-solid-state battery 100 according to the embodiment may selectively include a conductive agent and a binder. The conductive agent is not particularly limited, as long as it is conductive in the all-solid-state battery 100 according to the embodiment without causing a chemical change. For example, the conductive agent may be: graphite, such as natural graphite and artificial graphite; carbon-based materials, such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, and thermally cracked carbon black; conductive fibers, such as carbon fibers and metal fibers; fluorinated carbon; 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; and polyphenylene derivatives.

[0060] Adhesives can be used to improve the bonding strength between active materials and conductive agents, etc. Adhesives can be 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, and various copolymers, but are not limited to these.

[0061] The negative electrode layer 121 applied to the all-solid-state battery 100 according to the embodiment can be manufactured by directly coating and drying a composition containing a negative electrode active material onto a negative electrode current collector containing a metal (such as copper), but the preparation method is not limited to this.

[0062] In the examples of this disclosure, at least a portion of the negative electrode layer 121 of the all-solid-state battery 100 according to an embodiment may be led out to a third-side surface of the electrode assembly 110. (Refer to...) Figure 2 According to this example, the negative electrode layer 121 of the all-solid-state battery 100 can be led out on one surface of the electrode assembly 110 in the third direction, and more specifically, on one surface of the electrode assembly 110 in the 3-2 direction. In the all-solid-state battery 100 according to the embodiment, as described above, the negative electrode layer 121 is led out directly from the electrode assembly 110 in the 3-2 direction, and therefore can be connected to the negative terminal 131 without a separate through-hole electrode, thereby obtaining a higher capacity than that of prior art batteries.

[0063] The positive electrode layer 122 of the all-solid-state battery 100 according to the embodiment may include a positive electrode current collector 122a and a positive electrode active material 122b.

[0064] In the examples of this disclosure, the positive electrode active material contained in the positive electrode layer 122 is not particularly limited, as long as it ensures sufficient capacity. For example, the positive electrode active material may include at least one selected from the group consisting of lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium iron phosphorus oxide, and lithium manganese oxide, but is not limited thereto. Any positive electrode active material available in the art may be used.

[0065] The positive electrode active material can be, for example, a compound represented by the following chemical formula: Li a A l-b M b D2 (where 0.90≤a≤1.8, 0≤b≤0.5); Li a E l-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 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 G e O2 (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 NiG b O2 (where 0.90≤a≤1.8, 0.001≤b≤0.1); Li a CoG b O2 (where 0.90≤a≤1.8, 0.001≤b≤0.1); Li a MnG b O2 (where 0.90≤a≤1.8, 0.001≤b≤0.1); Li a Mn2G b O4 (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. In the above chemical formulas, 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; J is V, Cr, Mn, Co, Ni, or Cu. It should be understood that, for the above chemical formulas, all elements in a chemical formula containing the chemical element represented by the symbol (e.g., at least one of A, M, D, X, G, Q, R, J) are not repeated.

[0066] The positive electrode active material can also be LiCoO2 or LiMn. x O 2x (where x = 1 or 2), LiNi 1-x Mn x O 2x (where 0) <x<1)、LiNi 1-x-y Co x Mn y O2 (where 0≤x≤0.5, 0≤y≤0.5), LiFePO4, TiS2, FeS2, TiS3 or FeS3, but not limited to these.

[0067] The positive electrode current collector of the all-solid-state battery 100 according to the embodiment may have the same structure as the negative electrode current collector. The positive electrode current collector may be, for example, a porous body (such as a mesh or mesh shape), and may be a porous metal plate (such as stainless steel, copper, nickel, or aluminum), but is not limited thereto. In addition, the positive electrode current collector may be coated with an antioxidant metal or alloy film to prevent oxidation.

[0068] In addition to using a positive electrode active material instead of a negative electrode active material, the positive electrode layer 122 can be manufactured using a method that is almost identical to the negative electrode layer manufacturing process described above.

[0069] In the examples of this disclosure, at least a portion of the positive electrode layer 122 of the all-solid-state battery 100 according to an embodiment may be led out to a third-side surface of the electrode assembly 110. (Refer to...) Figure 2 According to this example, the positive electrode layer 122 of the all-solid-state battery 100 can be led out on one surface of the electrode assembly 110 in the third direction, and more specifically, on one surface of the electrode assembly 110 in the 3-1 direction. In the all-solid-state battery 100 according to the embodiment, as described above, the positive electrode layer 122 is directly led out in the 3-1 direction of the electrode assembly 110, and therefore can be connected to the positive terminal 132 without a separate through-hole electrode, thereby obtaining a higher capacity than that of prior art batteries.

[0070] In the electrode assembly 110 of the all-solid-state battery 100 according to the embodiment, the aforementioned laminate can be wound around the insulating member 123. The insulating member 123 may have a columnar shape with a third direction as its central axis. The insulating member 123 may have, for example, a cylindrical shape, but the shape is not limited thereto. The electrode assembly 110 of the all-solid-state battery 100 according to the embodiment is formed by winding the laminate around the insulating member 123 as its central axis, without requiring a separate through-hole forming process, etc. Therefore, the productivity of the all-solid-state battery 100 can be improved by simplifying the manufacturing process.

[0071] The insulating member 123 may comprise a ceramic material, including ceramic materials comprising metals and / or nonmetals, such as oxides, nitrides, carbides, arsenides, or mixtures thereof of metals and / or nonmetals, or any other suitable ceramic material. Examples include alumina (Al₂O₃), aluminum nitride (AlN), beryllium oxide (BeO), boron nitride (BN), silicon carbide (SiC), silicon dioxide (SiO₂), silicon nitride (Si₃N₄), gallium arsenide (GaAs), gallium nitride (GaN), barium titanate (BaTiO₃), zirconium dioxide (ZrO₂), or mixtures thereof. Alternatively, the insulating member 123 may selectively comprise oxides, nitrides, carbides, or mixtures thereof of metals and / or nonmetals. Furthermore, the insulating member 123 may selectively comprise the aforementioned solid electrolytes and may comprise one or more solid electrolytes, but the construction is not limited thereto.

[0072] In an embodiment, in the stack of the all-solid-state battery 100 according to the embodiment, the negative electrode layer 121 may be configured to contact the insulating member 123. In this case, the negative electrode layer 121 may be disposed on the innermost side of the electrode assembly 110. In the case of the electrode assembly 110 of the all-solid-state battery 100 according to the embodiment of the present disclosure, since the stack is wound around the insulating member 123 as a central axis, electrical isolation can be provided even when the negative electrode layer 121 is disposed on the innermost side, thereby preventing short circuits.

[0073] In another embodiment of this disclosure, in the laminate of the all-solid-state battery 100 according to the embodiment, the positive electrode layer 122 may be configured to contact the insulating member 123. In this case, the positive electrode layer 122 may be disposed at the innermost side of the electrode assembly 110. In the electrode assembly 110 of the all-solid-state battery 100 according to the embodiment, since the laminate is wound around the insulating member 123 as a central axis, a short circuit will not occur even when the positive electrode layer 122 is disposed at the innermost side.

[0074] In another embodiment of this disclosure, in the laminate of the all-solid-state battery 100 according to the embodiment, the solid electrolyte layer 111 may be configured to contact the insulating member 123. In this case, the solid electrolyte layer 111 may be disposed on the innermost side of the electrode assembly 110. When the solid electrolyte layer 111 of this embodiment includes a solid electrolyte with the above-described components and the insulating member 123 includes the above-described ceramic components, the solid electrolyte layer 111 and the insulating member 123 have similar sintering shrinkage behavior, thereby improving the bonding force between the solid electrolyte layer 111 and the insulating member 123.

[0075] In the examples of this disclosure, the solid electrolyte layer 111 may be disposed on the outermost portion of the electrode assembly 110 of the all-solid-state battery 100 according to the embodiment. The all-solid-state battery 100 according to the embodiment may include the electrode assembly 110, in which a stack of solid electrolyte layer 111, negative electrode layer 121, and positive electrode layer 122 stacked on top of each other is wound around an insulating member 123 serving as a central axis. In this case, for the electrical stability of the all-solid-state battery 100, the negative electrode layer 121 or the positive electrode layer 122 should not be exposed to the outside of the all-solid-state battery 100. As in the example above, when the solid electrolyte layer 111 is disposed on the outermost portion of the electrode assembly 110, the negative electrode layer 121 or the positive electrode layer 122 can naturally not be exposed to the outside of the all-solid-state battery 100, and the solid electrolyte layer 111 can also protect the internal structure of the electrode assembly 110 by sintering.

[0076] In the example, the surface shape of the electrode assembly 110 of the all-solid-state battery 100 according to the embodiment in the third direction can be circular. Since the electrode assembly 110 is formed by winding a laminate around an insulating member 123 as a central axis (described later), the electrode assembly 110 can have a circular end surface in the third direction. A circular shape does not necessarily mean a perfect circle in the strict sense, but can refer to various shapes that can be considered as including some curved portions due to manufacturing process errors, such as circles or ellipses.

[0077] Figure 5 and Figure 6 This is a schematic diagram illustrating a portion of the manufacturing process of an all-solid-state battery 100 according to an embodiment. (Refer to...) Figure 5 and Figure 6 In the stack of the all-solid-state battery 100 according to an embodiment, a plurality of solid electrolyte layers 111 are prepared by applying and drying a solid electrolyte on a carrier film. Subsequently, negative electrode patterns and positive electrode patterns for forming negative electrode layers 121 and positive electrode layers 122 can be printed on the solid electrolyte layers 111 and stacked to form a stack. The stack can be wound around an insulating member 123 as its center to form a cylindrical wound stack. Subsequently, the stack wound around the insulating member 123 can be cut at regular intervals to form an electrode assembly 110, wherein the negative electrode layer 121 is exposed through one cut surface and the positive electrode layer 122 is exposed through another cut surface.

[0078] The negative terminal 131 and the positive terminal 132 may be respectively disposed on two surfaces of the electrode assembly 110 of the all-solid-state battery 100 according to the embodiment in the third direction. Specifically, the negative terminal 131 may be disposed in the 3-2 direction of the electrode assembly 110, and the positive terminal 132 may be disposed in the 3-1 direction of the electrode assembly 110.

[0079] The negative terminal 131 and the positive terminal 132 are formed, for example, by applying a terminal electrode paste comprising a conductive metal to two surfaces of the electrode assembly 110 in the third direction, or by transferring a dried film obtained by drying the conductive paste onto the electrode assembly 110 and then sintering it, but the method is not limited to these. The conductive metal may be, for example, at least one conductive metal selected from copper (Cu), nickel (Ni), tin (Sn), palladium (Pd), platinum (Pt), gold (Au), silver (Ag), tungsten (W), titanium (Ti), lead (Pb), and alloys thereof, but is not limited to these.

[0080] In the examples of this disclosure, the surface of the negative electrode layer 121 connected to the negative terminal 131 may have a helical shape. In this specification, the “helix” of the component surface refers to a two-dimensional spiral or a three-dimensional helix, and the “helix” of the component surface may mean that the shortest distance from the insulating member 123 to the outermost point of the component increases as the number of times the component is wound around the insulating member 123 increases. In the electrode assembly 110 according to an embodiment, the laminate may be wound around the insulating member 123, which serves as an axis. Therefore, as the number of times the laminate is wound increases, the shortest distance from the insulating member 123 to the outermost point of the laminate may increase. The negative electrode layer 121 according to an embodiment may extend in a 3-2 direction of the electrode assembly 110, and the negative electrode layer 121 extending in the 3-2 direction of the electrode assembly 110 may be connected to the negative terminal 131.

[0081] The surface of the negative electrode layer 121 extending in the 3-2 direction of the electrode assembly 110 can be helical, and the surface of the negative electrode layer 121 connected to the negative terminal 131 can also be helical. In the all-solid-state battery 100 according to the embodiment, one surface of the negative electrode layer 121, which is a laminate wound around an insulating member 123 as a central axis, can extend in the 3-2 direction of the electrode assembly 110, and the negative electrode layer 121 extending in the 3-2 direction of the electrode assembly 110 can be connected to the negative terminal 131. In the all-solid-state battery 100 according to the embodiment, the surface of the negative electrode layer 121 extending to one surface of the electrode assembly 110 in the 3-2 direction is configured to connect to the negative terminal 131, thereby increasing the connection area with the negative terminal 131 compared to the case of using a via electrode, and thus reducing losses caused by resistance.

[0082] In the examples of this disclosure, the surface of the positive electrode layer 122 connected to the positive terminal 132 may have a helical shape. According to the embodiment, the positive electrode layer 122 may be led out in the 3-1 direction of the electrode assembly 110, and the positive electrode layer 122 led out in the 3-1 direction of the electrode assembly 110 may be connected to the positive terminal 132. The shape of the surface of the positive electrode layer 122 led out in the 3-1 direction of the electrode assembly 110 may be helical, and the shape of the surface of the positive electrode layer 122 connected to the positive terminal 132 may also be helical. In the all-solid-state battery 100 according to the embodiment, the surface of the positive electrode layer 122 led out to one surface of the electrode assembly 110 in the 3-1 direction is configured to connect to the positive terminal 132, thereby increasing the connection area with the positive terminal 132 compared to the case using via electrodes, etc., and thus reducing losses caused by resistance.

[0083] In the example, in the all-solid-state battery 100 according to the embodiment, when the average distance between the interface where the electrode assembly 110 contacts the negative terminal 131 and the interface where the electrode assembly 110 contacts the positive terminal 132 is T, and the average distance between the negative electrode layer 121 and the positive terminal 132 or between the positive electrode layer 122 and the negative terminal 131 is t, the percentage of t to T ((t / T) × 100) can be in the range of 1% or greater and / or 30% or less. In this specification, "distance" can refer to the shortest vertical distance from one component to another, and "average distance" can refer to the arithmetic mean of the distances measured at each of five locations to the left and right of the insulating member 123 of the negative electrode layer 121 or the positive electrode layer 122, relative to a cross-section cut along a direction parallel to the Z-axis and passing through the center of the insulating member 123 of the all-solid-state battery 100. See also... Figure 2 t may refer to the average margin of the negative electrode layer 121 or the positive electrode layer 122 in a third direction, and T may refer to the average thickness of the electrode assembly 110 in a third direction. In the all-solid-state battery 100 according to the embodiment, the capacity can be further increased by adjusting t to meet the above range.

[0084] In the examples of this disclosure, a portion of the negative terminal 131 of the all-solid-state battery 100 according to an embodiment is disposed on one surface of the electrode assembly 110 in a third-party direction, and the remaining portion of the negative terminal 131 may extend on the surface of the electrode assembly 110 perpendicular to the third-party direction. Additionally, a portion of the positive terminal 132 may be disposed on another surface of the electrode assembly 110 in a third-party direction, and the remaining portion of the positive terminal 132 may extend on the surface of the electrode assembly 110 perpendicular to the third-party direction. In this case, the negative terminal 131 and the positive terminal 132 may be spaced apart from each other on the surface of the electrode assembly 110 perpendicular to the third-party direction. The extended portions may serve as so-called strips and may prevent moisture from penetrating into the all-solid-state battery 100 according to an embodiment.

[0085] In the example, the all-solid-state battery 100 according to the embodiment may further include plating layers (not shown) respectively disposed on the negative terminal 131 and the positive terminal 132. The plating layer may include, but is not limited to, at least one selected from the group consisting of copper (Cu), nickel (Ni), tin (Sn), palladium (Pd), platinum (Pt), gold (Au), silver (Ag), tungsten (W), titanium (Ti), lead (Pb), and alloys thereof. The plating layer may be formed in a single layer or multiple layers and may be formed by sputtering or electroplating (electrodeposition), but the formation method is not limited to these methods.

[0086] In embodiments, the all-solid-state battery 100 of this disclosure may further include a housing 140, which is configured to surround the electrode assembly 110 in a first direction and a second direction. The housing serves to protect against external contamination or impact. The material of the housing is not particularly limited and may include, for example, ceramic components (such as the ceramic components of the insulating member 123 described above) or polymers (such as epoxy resin), but the material is not limited thereto.

[0087] While this disclosure includes specific examples, it will be readily understood by those skilled in the art that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be understood for descriptive purposes only and not for limiting purposes. The description of features or aspects in each example is to be considered applicable to similar features or aspects in other examples. Suitable results may be obtained if the described techniques are performed in a different order, and / or if components in the described system, architecture, apparatus, or circuit are combined in a different manner and / or if components in the described system, architecture, apparatus, or circuit are replaced or supplemented by other components or their equivalents. Therefore, the scope of this disclosure is not limited by the specific embodiments but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents shall be construed as included in this disclosure.

Claims

1. An all-solid-state battery, comprising: An electrode assembly comprising a laminate and an insulating member, the laminate comprising stacked solid electrolyte layers, a negative electrode layer, and a positive electrode layer, the solid electrolyte layers being intermediate between the negative electrode layer and the positive electrode layer, the laminate being wound around the insulating member such that one surface of the negative electrode layer or the positive electrode layer in the stacking direction of the laminate is parallel to the central axis of the insulating member; The negative terminal is connected to the negative electrode layer; and The positive terminal is connected to the positive electrode layer. The negative terminal is disposed on one surface of the electrode assembly along the central axis of the central axis of the insulating member, and the positive terminal is disposed on another surface of the electrode assembly along the central axis. The surface of the negative electrode layer that is directly connected to the negative terminal has a spiral shape.

2. The all-solid-state battery as described in claim 1, wherein, The surface of the electrode assembly in the direction of the central axis is circular.

3. The all-solid-state battery as described in claim 1, wherein, At least a portion of the negative electrode layer extends to one surface of the electrode assembly in the direction of the central axis, and At least a portion of the positive electrode layer extends to the other surface of the electrode assembly in the direction of the central axis.

4. The all-solid-state battery as described in claim 1, wherein, The negative electrode layer comprises stacked negative electrode current collectors and negative electrode active materials, wherein the negative electrode current collectors are interposed between the negative electrode active materials, and The positive electrode layer includes stacked positive electrode current collectors and positive electrode active materials, with the positive electrode current collectors located between the positive electrode active materials.

5. The all-solid-state battery as described in claim 1, wherein, The laminate is configured such that the negative electrode layer is in contact with the insulating member.

6. The all-solid-state battery as described in claim 1, wherein, The laminate is configured such that the positive electrode layer is in contact with the insulating member.

7. The all-solid-state battery as described in claim 1, wherein, The laminate is configured such that the solid electrolyte layer is in contact with the insulating component.

8. The all-solid-state battery as described in claim 1, wherein, The electrode assembly is provided with the solid electrolyte layer disposed on its outermost portion.

9. The all-solid-state battery as described in claim 1, wherein, The negative electrode layer is spaced apart from the other surface of the electrode assembly in the central axis direction, and the positive electrode layer is spaced apart from the one surface of the electrode assembly in the central axis direction.

10. The all-solid-state battery as claimed in claim 1, wherein, The surface of the positive electrode layer that is directly connected to the positive terminal has a spiral shape.

11. The all-solid-state battery as claimed in claim 1, wherein, The average distance between the negative electrode layer and the positive terminal or between the positive electrode layer and the negative terminal is t, and the average distance between the interface surface of the electrode assembly in contact with the negative terminal and the interface surface of the electrode assembly in contact with the positive terminal is T, where t is a percentage of T in the range of 1% or greater and 30% or less.

12. The all-solid-state battery as claimed in claim 1, wherein, A portion of the negative terminal is disposed on one surface of the electrode assembly in the direction of the central axis, and another portion of the negative terminal is disposed extending on the surface of the electrode assembly that connects the one surface and the other surface and around the direction of the central axis. A portion of the positive terminal is disposed on the other surface of the electrode assembly in the direction of the central axis, and another portion of the positive terminal is disposed extending on the surface of the electrode assembly that connects the one surface and the other surface and around the direction of the central axis.

13. The all-solid-state battery as described in claim 1 or 7, wherein, The insulating component comprises a ceramic material.

14. The all-solid-state battery as claimed in claim 1, further comprising: The housing is configured to surround the electrode assembly in a first direction and a second direction, wherein the direction perpendicular to the central axis direction is defined as the first direction, and the direction perpendicular to both the central axis direction and the first direction is defined as the second direction.

15. An all-solid-state battery, comprising: Electrode assembly, including: A laminate, comprising stacked solid electrolyte layers, a negative electrode layer, and a positive electrode layer, wherein the solid electrolyte layers are intermediate between the negative electrode layer and the positive electrode layer. Insulating components, The laminate is wound around the insulating member such that the surface of the negative electrode layer or the positive electrode layer in the stacking direction of the laminate is parallel to the central axis of the insulating member, and At least a portion of the negative electrode layer is exposed on one surface of the electrode assembly in the direction of the central axis of the insulating member, and at least a portion of the positive electrode layer is exposed on another surface of the electrode assembly opposite to the one surface in the direction of the central axis. The all-solid-state battery also includes a negative terminal connected to the negative electrode layer, and the surface of the negative electrode layer that is directly connected to the negative terminal has a spiral shape.

16. The all-solid-state battery of claim 15, wherein, The surface of the electrode assembly in the direction of the central axis is circular.

17. The all-solid-state battery as claimed in claim 15, wherein, The negative electrode layer comprises stacked negative electrode current collectors and negative electrode active materials, wherein the negative electrode current collectors are interposed between the negative electrode active materials, and The positive electrode layer includes stacked positive electrode current collectors and positive electrode active materials, with the positive electrode current collectors located between the positive electrode active materials.

18. The all-solid-state battery as claimed in claim 15, wherein, The laminate is configured such that the negative electrode layer is in contact with the insulating member.

19. The all-solid-state battery as claimed in claim 15, wherein, The laminate is configured such that the positive electrode layer is in contact with the insulating member.

20. The all-solid-state battery of claim 15, wherein, The laminate is configured such that the solid electrolyte layer is in contact with the insulating component.

21. The all-solid-state battery as described in claim 15, wherein, The electrode assembly is provided with the solid electrolyte layer disposed on its outermost portion.

22. The all-solid-state battery as described in claim 15, wherein, The negative electrode layer is spaced apart from the other surface, and the positive electrode layer is spaced apart from the first surface.

23. The all-solid-state battery of claim 22, further comprising a positive terminal connected to the positive electrode layer, wherein, The surface of the positive electrode layer that is directly connected to the positive terminal has a spiral shape.

24. The all-solid-state battery as described in claim 23, wherein, The average distance between the negative electrode layer and the positive terminal or between the positive electrode layer and the negative terminal is t, and the average distance between the interface surface of the electrode assembly in contact with the negative terminal and the interface surface of the electrode assembly in contact with the positive terminal is T, where t is a percentage of T in the range of 1% or greater and 30% or less.

25. The all-solid-state battery as described in claim 23, wherein, A portion of the negative terminal is disposed on one surface of the electrode assembly in the direction of the central axis, and another portion of the negative terminal is disposed extending on the surface of the electrode assembly that connects the one surface and the other surface and around the direction of the central axis. A portion of the positive terminal is disposed on the other surface of the electrode assembly in the direction of the central axis, and another portion of the negative terminal is disposed extending on the surface of the electrode assembly that connects the one surface and the other surface and around the direction of the central axis.

26. The all-solid-state battery as claimed in claim 15 or 20, wherein, The insulating component comprises a ceramic material.

27. An all-solid-state battery, comprising: Electrode assembly, including: A laminate, comprising stacked solid electrolyte layers, a negative electrode layer, and a positive electrode layer, wherein the solid electrolyte layers are intermediate between the negative electrode layer and the positive electrode layer. Insulating components, The laminate is wound around the insulating member such that the surface of the negative electrode layer or the positive electrode layer in the stacking direction of the laminate is parallel to the central axis of the insulating member; The negative terminal is connected to the negative electrode layer; and The positive terminal is connected to the positive electrode layer. The negative electrode layer comprises stacked negative electrode current collectors and negative electrode active materials, with the negative electrode current collectors positioned between the negative electrode active materials. Similarly, the positive electrode layer comprises stacked positive electrode current collectors and positive electrode active materials, with the positive electrode current collectors positioned between the positive electrode active materials. The surface of the positive electrode layer that is directly connected to the positive terminal has a spiral shape.

28. The all-solid-state battery of claim 27, wherein, The electrode assembly has a circular shape on its surface in the direction of the central axis of the central axis of the insulating member.

29. The all-solid-state battery of claim 27, wherein, At least a portion of the negative electrode layer extends to one surface of the electrode assembly in the direction of the central axis of the central axis of the insulating member, and at least a portion of the positive electrode layer extends to another surface of the electrode assembly in the direction of the central axis.

30. The all-solid-state battery of claim 27, wherein, The laminate is configured such that the negative electrode layer is in contact with the insulating member.

31. The all-solid-state battery as described in claim 27, wherein, The laminate is configured such that the positive electrode layer is in contact with the insulating member.

32. The all-solid-state battery as described in claim 27, wherein, The laminate is configured such that the solid electrolyte layer is in contact with the insulating component.

33. The all-solid-state battery as described in claim 27, wherein, The electrode assembly is provided with the solid electrolyte layer disposed on its outermost portion.

34. The all-solid-state battery as claimed in claim 27, wherein, The surface of the negative electrode layer that is directly connected to the negative terminal has a spiral shape.

35. The all-solid-state battery as described in claim 29, wherein, The positive electrode layer is spaced apart from the one surface, and the negative electrode layer is spaced apart from the other surface.

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