Battery

Abstract

To provide a battery superior in heat dissipation property as desired in the conventional art.SOLUTION: A battery comprises: an electrode layer; a counter electrode layer as a counter electrode to the electrode layer; and a solid electrolyte layer located between the electrode layer and the counter electrode layer. The solid electrolyte layer has a first region including a first solid electrolytic material, and a second region including a second solid electrolytic material. The first region is located in an area where the electrode layer is opposed to the counter electrode layer. The second region is located, bordering the first region on an outer peripheral side of the area where the electrode layer is opposed to the counter electrode layer, with respect to the first region. Supposing that a density of the first solid electrolytic material in the first region is a first density, and a density of the second solid electrolytic material in the second region is a second density, the second density is higher than the first density.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to batteries. [Background technology]

[0002] Patent Document 1 discloses an electricity storage device in which the density of a solid electrolyte in an electrode layer containing an active material varies depending on the position in the electrode layer.

[0003] Patent Document 2 discloses an all-solid-state secondary battery including a solid electrolyte layer. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4274256 specification [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-192265 Summary of the Invention [Problem to be solved by the invention]

[0005] In the prior art, a battery with excellent heat dissipation properties is desired. [Means for solving the problem]

[0006] A battery according to one embodiment of the present disclosure includes an electrode layer, a counter electrode layer that is a counter electrode of the electrode layer, and a solid electrolyte layer located between the electrode layer and the counter electrode layer, the solid electrolyte layer having a first region containing a first solid electrolyte material and a second region containing a second solid electrolyte material, the first region being located within a region where the electrode layer and the counter electrode layer face each other, and the second region being located closer to the outer periphery of the region where the electrode layer and the counter electrode layer face each other than the first region and in contact with the first region, wherein a first density is a density of the first solid electrolyte material in the first region and a second density is a density of the second solid electrolyte material in the second region, the second density being higher than the first density. [Effects of the Invention]

[0007] According to the present disclosure, a battery with excellent heat dissipation properties can be realized. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a battery 1000 according to the first embodiment. [Figure 2] FIG. 2 is a diagram showing a schematic configuration of the battery 1100 according to the first embodiment. [Figure 3] FIG. 3 is a diagram showing a schematic configuration of the battery 1200 according to the first embodiment. [Figure 4] FIG. 4 is a diagram showing a schematic configuration of a battery 2000 according to the second embodiment. [Figure 5] FIG. 5 is a diagram showing a schematic configuration of a battery 2100 according to the second embodiment. [Figure 6] FIG. 6 is a diagram showing a schematic configuration of a battery 2200 according to the second embodiment. [Figure 7] FIG. 7 is a diagram showing a schematic configuration of a battery 3000 according to the third embodiment. [Figure 8] FIG. 8 is a diagram showing a schematic configuration of a battery 3100 according to the third embodiment. [Figure 9] FIG. 9 is a diagram showing a schematic configuration of a battery 3200 according to the third embodiment. [Figure 10] FIG. 10 is a diagram showing a schematic configuration of a battery 3300 according to the third embodiment. [Figure 11] FIG. 11 is a diagram showing a schematic configuration of a battery 3400 according to the third embodiment. [Figure 12] FIG. 12 is a diagram showing a schematic configuration of a battery 3500 according to the third embodiment. [Figure 13] FIG. 13 is a diagram showing a schematic configuration of a battery 4000 according to the fourth embodiment. [Figure 14] FIG. 14 is a diagram showing a schematic configuration of a battery 4100 according to the fourth embodiment. [Figure 15]FIG. 15 is a diagram showing a schematic configuration of a battery 4200 according to the fourth embodiment. [Figure 16] FIG. 16 is a diagram showing a schematic configuration of a battery 4300 according to the fourth embodiment. [Figure 17] FIG. 17 is a diagram showing a schematic configuration of a battery 5000 according to the fifth embodiment. [Figure 18] FIG. 18 is a diagram showing a schematic configuration of a battery 5100 according to the fifth embodiment. [Figure 19] FIG. 19 is a diagram showing a schematic configuration of a battery 5200 according to the fifth embodiment. [Figure 20] FIG. 20 is a diagram showing a schematic configuration of a battery 5300 according to the fifth embodiment. [Figure 21] FIG. 21 is a diagram showing a schematic configuration of a battery 6000 according to the sixth embodiment. [Figure 22] FIG. 22 is a diagram showing a schematic configuration of a battery 6100 according to the sixth embodiment. [Figure 23] FIG. 23 is a diagram showing a schematic configuration of a battery 6200 according to the sixth embodiment. [Figure 24] FIG. 24 is a diagram showing a schematic configuration of a battery 6300 according to the sixth embodiment. [Figure 25] FIG. 25 is a diagram showing a schematic configuration of a battery 6400 according to the sixth embodiment. [Figure 26] FIG. 26 is a diagram showing a schematic configuration of a battery 6500 according to the sixth embodiment. [Figure 27] FIG. 27 is a diagram showing a schematic configuration of a battery 6600 according to the sixth embodiment. [Figure 28] FIG. 28 is a diagram showing a schematic configuration of a battery 6700 according to the sixth embodiment. [Figure 29] FIG. 29 is a diagram showing a schematic configuration of a battery 7000 according to the seventh embodiment. [Figure 30] FIG. 30 is a diagram showing a schematic configuration of a battery 7100 according to the seventh embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments will be described with reference to the drawings.

[0010] The embodiments described below each illustrate a specific example. The numerical values, shapes, materials, components, component placement positions, and connection configurations shown in the following embodiments are merely examples and are not intended to limit the present invention. Furthermore, among the components in the following embodiments, components that are not described in the independent claims that represent the highest concepts are described as optional components.

[0011] (Embodiment 1) FIG. 1 is a diagram showing a schematic configuration of a battery 1000 according to the first embodiment.

[0012] FIG. 1(a) is an xz diagram (1A cross section) showing a schematic configuration of a battery 1000 according to the first embodiment. (Surface view).

[0013] FIG. 1(b) is an xy diagram (top perspective view) showing a schematic configuration of the battery 1000 according to the first embodiment.

[0014] The battery 1000 in the first embodiment includes an electrode layer 100 , a counter electrode layer 200 , and a solid electrolyte layer 300 .

[0015] The counter electrode layer 200 is a layer that serves as a counter electrode to the electrode layer 100 .

[0016] The solid electrolyte layer 300 is located between the electrode layer 100 and the counter electrode layer 200 .

[0017] The solid electrolyte layer 300 has a first region 310 and a second region 320 .

[0018] The first region 310 is a region containing a first solid electrolyte material.

[0019] The first region 310 is located in a region where the electrode layer 100 and the counter electrode layer 200 face each other.

[0020] The second region 320 is a region containing a second solid electrolyte material.

[0021] The second region 320 is located closer to the outer periphery of the region where the electrode layer 100 and the counter electrode layer 200 face each other than the first region 310. Furthermore, the second region 320 is located in contact with the first region 310.

[0022] The second density is higher than the first density.

[0023] Here, the first density is the density of the first solid electrolyte material in the first region 310.

[0024] The second density is the density of the second solid electrolyte material in the second region 320.

[0025] According to the above configuration, a battery excellent in heat dissipation, strength, and environmental resistance can be realized.

[0026] That is, with the above configuration, the density of the solid electrolyte material in the outer peripheral portion of the solid electrolyte layer 300 can be increased. As a result, the thermal conductivity of the outer peripheral portion of the solid electrolyte layer 300 (i.e., the second region 320) can be made higher than that of the central portion of the solid electrolyte layer 300 (i.e., the first region 310). Therefore, heat from the central portion of the solid electrolyte layer 300, which is likely to become hot during battery operation, is easily propagated (diffused) to the outer peripheral portion of the solid electrolyte layer 300. Furthermore, since both the first region 310 and the second region 320 are regions containing the solid electrolyte material (i.e., a metal ion conductive material), the consistency and adhesion of the interface at the contact portion between the first region 310 and the second region 320 can be improved. That is, heat can be transported from the first region 310 to the second region 320 through the junction interface between the first region 310 and the second region 320 via the conduction of metal ions by the solid electrolyte material and the bridging of heat-generating components. As a result, heat generated in the central portion of the battery (for example, heat generated in the first region 310, the electrode layer 100, or the counter electrode layer 200) can be more easily dissipated to the surface of the solid electrolyte layer 300 (and to the outside of the battery) via the outer edge portion of the solid electrolyte layer 300 (i.e., the second region 320), which has a higher density of the solid electrolyte material (i.e., a higher thermal conductivity). This makes it possible to reduce temperature non-uniformity (temperature variation) in the solid electrolyte layer 300, which contains a solid electrolyte material with no fluidity (for example, an inorganic solid electrolyte). Therefore, even when the area of the battery is increased, for example, it is possible to maintain the temperature uniformity inside the battery. This reduces the risk of temperature variations occurring due to temperature variations. As a result, it is possible to suppress the internal characteristics of the battery from varying depending on the location, which in turn suppresses the deterioration of the battery performance and therefore, for example, extends the life of the battery.

[0027] Furthermore, according to the above configuration, the solid electrolyte layer 300 located between the electrode layer 100 and the counter electrode layer 200 has the above-mentioned heat dissipation function, and thus the solid electrolyte layer 300, which is one battery component, can propagate heat generated from both the electrode layer 100 and the counter electrode layer 200 to the outer edge of the battery. Furthermore, since the solid electrolyte layer 300 is a component located in the central portion inside the battery (i.e., between the electrode layer 100 and the counter electrode layer 200), it can more easily propagate heat generated in the central portion of the battery to the outer edge of the battery compared to a configuration in which a heat dissipation component is provided only on the electrode layer 100 side (or only on the counter electrode layer 200 side).

[0028] Furthermore, with the above configuration, the strength of the second region 320 can be increased by increasing the density of the solid electrolyte material in the second region 320. This allows the stronger second region 320 to cover at least a portion of the outer edge of the first region 310. Therefore, damage to the relatively weak first region 310 (e.g., collapse of the first solid electrolyte material) can be suppressed by the second region 320. This improves the strength of the battery.

[0029] Furthermore, with the above configuration, the second region 320, which has a higher solid electrolyte material density, can be interposed between the first region 310 and the outside of the battery (e.g., outside air). This makes it possible, for example, for the second region 320 to block the passage of outside air (e.g., atmospheric air, moisture, etc.) to the first region 310. This improves the environmental resistance of the battery.

[0030] The electrode layer 100 may contain an electrode active material.

[0031] The counter electrode layer 200 may also contain a counter electrode active material.

[0032] In this case, both the density of the electrode active material in the first region 310 (e.g., if the electrode active material is particulate, the packing density of the particles of the electrode active material) and the density of the counter electrode active material (e.g., if the counter electrode active material is particulate, the packing density of the particles of the counter electrode active material) may be lower than the first density.

[0033] In addition, both the density of the electrode active material and the density of the counter electrode active material in the second region 320 may be lower than the second density.

[0034] According to the above configuration, the first region 310 and the second region 320 can be arranged in a portion where the density of the electrode active material and the counter electrode active material is low (i.e., a portion located closer to the center of the solid electrolyte layer 300, away from both the electrode layer 100 and the counter electrode layer 200). In other words, the first region 310 and the second region 320, which have high heat dissipation properties, can be arranged in a more central portion inside the battery. This makes it easier for heat generated in the central portion of the battery to be transmitted to the outer edge portion of the battery, compared to a configuration in which heat dissipation members are provided only in positions closer to the electrode layer 100 side (or only in positions closer to the counter electrode layer 200 side).

[0035] The first region 310 and the second region 320 may be regions that do not contain an electrode active material or a counter electrode active material.

[0036] According to the above configuration, the first region 310 and the second region 320 can be disposed in a portion that does not contain the electrode active material and the counter electrode active material (i.e., a portion located closer to the center of the solid electrolyte layer 300, away from both the electrode layer 100 and the counter electrode layer 200). In other words, the first region 310 and the second region 320, which have high heat dissipation properties, can be disposed in a more central portion inside the battery. This allows the first region 310 and the second region 320 to be disposed only in a position closer to the electrode layer 100 side (or closer to the counter electrode layer 200 side). In comparison with a configuration in which a heat dissipation member is provided only in a position close to the battery, heat generated in the central portion of the battery can be more easily transmitted to the outer edge portion of the battery.

[0037] The area where the electrode layer 100 is formed may be the same size as or different from the area where the counter electrode layer 200 is formed. In other words, the electrode layer 100 and the counter electrode layer 200 may have the same shape or different shapes.

[0038] The electrode layer 100 may be a positive electrode layer. In this case, the electrode active material is a positive electrode active material. The counter electrode layer 200 is a negative electrode layer. The counter electrode active material is a negative electrode active material.

[0039] Alternatively, the electrode layer 100 may be a negative electrode layer. In this case, the electrode active material is a negative electrode active material. The counter electrode layer 200 is a positive electrode layer. The counter electrode active material is a positive electrode active material.

[0040] The positive electrode layer may be a layer mainly composed of a positive electrode material (for example, a positive electrode active material). As the positive electrode active material contained in the positive electrode layer, various materials capable of extracting and inserting metal ions (for example, Li ions, Mg ions, etc.) can be used. As the material for the positive electrode active material, known positive electrode active materials can be used. As the positive electrode active material, for example, lithium-nickel composite oxide (LiNi x M 1-x Examples of suitable transition metal oxides include layered oxides such as lithium ion-containing lithium ions, such as lithium ion-containing lithium ions (LiCoO), lithium ion-containing lithium ions (LiCoO), lithium ion-containing lithium ions (LiNiO), lithium ion-containing lithium ions (LiMnO), lithium ion-containing lithium ions (LiMnO, LiMnO, LiMO), lithium ion-containing lithium ions (LiFePO, LiFePO, LiMnO, LiMnO). Sulfides such as sulfur (S) and lithium sulfide (LiS) can also be used. Positive electrode active material particles coated with (or doped with) lithium ion-containing lithium ions (LiNbO) can also be used.

[0041] The positive electrode layer may be a mixture layer composed of a mixture of a positive electrode active material and other additive materials. Examples of additive materials for the positive electrode layer include solid electrolytes (e.g., inorganic solid electrolytes), conductive additives (e.g., acetylene black), and adhesive binders (e.g., polyethylene oxide, polyvinylidene fluoride). By mixing the solid electrolytes and other additives into the positive electrode layer in a predetermined ratio, the ionic conductivity of the positive electrode layer can be improved.

[0042] The thickness of the positive electrode layer may be, for example, 5 to 300 μm.

[0043] The negative electrode layer may be a layer mainly composed of a negative electrode material (for example, a negative electrode active material). As the negative electrode active material contained in the negative electrode layer, various materials capable of extracting and inserting metal ions (for example, Li ions, Mg ions, etc.) can be used. As the material for the negative electrode active material, known negative electrode active materials can be used. As the negative electrode active material, for example, carbon materials (for example, natural graphite, artificial graphite, graphite carbon fiber, resin-baked carbon, etc.), alloy-based materials to be combined with solid electrolytes, etc. can be used. As the alloy-based material, for example, lithium alloys (LiAl, LiZn, Li3Bi, Li3Cd, Li3Sb, Li4Si, Li 4.4 Pb, Li 4.4 Sn, Li 0.17 C, LiC6, etc.), lithium titanate (Li4Ti5O 12 ), oxides of metals (such as Zn), etc. can be used.

[0044] The negative electrode layer may be a mixture layer made of a mixture of a negative electrode active material and other additive materials. Examples of additive materials for the negative electrode layer include solid electrolytes (e.g., inorganic solid electrolytes), conductive additives (e.g., acetylene black), and adhesive binders (e.g., polyethylene oxide, polyvinylidene fluoride). By mixing the material and the like in a predetermined ratio, the ionic conductivity of the negative electrode layer can be improved.

[0045] The thickness of the negative electrode layer is, for example, 5 to 300 μm.

[0046] As the first solid electrolyte material and the second solid electrolyte material, a generally known solid electrolyte for batteries (a solid electrolyte that conducts metal ions (e.g., Li ions, Mg ions, etc.)) can be used. As the solid electrolyte, a generally known solid electrolyte (e.g., an inorganic solid electrolyte, etc.) can be used. As the inorganic solid electrolyte, a sulfide solid electrolyte, an oxide solid electrolyte, etc. can be used. As the solid electrolyte, for example, a lithium-containing sulfide (e.g., Li2S-P2S5-based, Li2S-SiS2-based, Li2S-B2S3-based, Li2S-GeS2-based, Li2S-SiS2-LiI-based, Li2S-SiS2-Li3PO4-based, Li2S-Ge2S2-based, Li2S-GeS2-P2S5-based, Li2S-GeS2-ZnS-based, etc.) can be used. Alternatively, the solid electrolyte may be, for example, a lithium-containing metal oxide (e.g., Li2-SiO2, Li2-SiO2-P2O5, etc.), a lithium-containing metal nitride (e.g., Li x P y O 1-z N2 (where x, y, and z are any natural numbers), lithium phosphate (Li3PO4), lithium-containing transition metal oxides (e.g., lithium titanium oxide), etc. As the solid electrolyte, only one of these materials may be used, or two or more of these materials may be used in combination.

[0047] In addition, the solid electrolyte layer 300 (e.g., at least one (e.g., all) of the first region 310, the second region 320, and the third region 330) may contain, in addition to the solid electrolyte material, a bonding binder (e.g., polyethylene oxide, polyvinylidene fluoride, etc.), etc.

[0048] The thickness of the solid electrolyte layer 300 may be, for example, 5 to 150 μm.

[0049] The first solid electrolyte material and the second solid electrolyte material may be different materials, which allows, for example, using a solid electrolyte material with high heat dissipation properties as the second solid electrolyte material and using a solid electrolyte material with high metal ion conductivity as the first solid electrolyte material.

[0050] Alternatively, the first solid electrolyte material and the second solid electrolyte material may be the same material.

[0051] According to the above configuration, the first region 310 and the second region 320 can contain the same solid electrolyte material. This allows the physical properties (e.g., thermal expansion coefficient, etc.) of the first region 310 and the second region 320 to be closer to each other. This improves the interfacial consistency and adhesion at the contact portion between the first region 310 and the second region 320. In other words, the occurrence of structural defects that inhibit heat transport between the first region 310 and the second region 320 can be further suppressed. This allows heat generated in the central portion of the battery (e.g., heat generated in the first region 310, the electrode layer 100, or the counter electrode layer 200) to be more easily dissipated to the surface of the solid electrolyte layer 300 (and outside the battery) via the second region 320. Furthermore, for example, when the first region 310 and the second region 320 are made of the same material, the battery manufacturing process (e.g., mixing the mixture, applying the mixture, etc.) can be further simplified.

[0052] The first solid electrolyte material may be configured as particles. In this case, the first region 310 is a region containing particles of the first solid electrolyte material. In this case, the first density is the density of the first region 310. is the density of the particles of the first solid electrolyte material at 10 (i.e., packing density).

[0053] The second solid electrolyte material may be configured as particles. In this case, the second region 320 is a region containing particles of the second solid electrolyte material. In this case, the second density is the density of the particles of the second solid electrolyte material in the second region 320 (i.e., the packing density).

[0054] The first region 310 may be a region located in contact with at least one of the electrode layer 100 and the counter electrode layer 200. For example, as shown in FIG. 1 , the first region 310 may be a region located in contact with both the electrode layer 100 and the counter electrode layer 200.

[0055] As shown in FIG. 1, the second region 320 may be located only in the region where the electrode layer 100 and the counter electrode layer 200 face each other.

[0056] FIG. 2 is a diagram showing a schematic configuration of the battery 1100 according to the first embodiment.

[0057] FIG. 2(a) is an xz diagram (cross-sectional view taken along line 2A) showing a schematic configuration of the battery 1100 according to the first embodiment.

[0058] FIG. 2(b) is an xy diagram (top perspective view) showing a schematic configuration of the battery 1100 according to the first embodiment.

[0059] 2, the second region 320 may be located both within the region where the electrode layer 100 and the counter electrode layer 200 face each other and outside the region where the electrode layer 100 and the counter electrode layer 200 face each other. This allows the second region 320 to be located further away from the center of the battery. This further improves the heat dissipation properties of the second region 320.

[0060] The second region 320 may be a region located in contact with at least one of the electrode layer 100 and the counter electrode layer 200. For example, as shown in Fig. 1 or 2, the second region 320 may be a region located in contact with both the electrode layer 100 and the counter electrode layer 200.

[0061] FIG. 3 is a diagram showing a schematic configuration of the battery 1200 according to the first embodiment.

[0062] FIG. 3(a) is an xz diagram (cross-sectional view taken along line 3A) showing a schematic configuration of the battery 1200 in the first embodiment.

[0063] FIG. 3(b) is an xy diagram (top perspective view) showing a schematic configuration of the battery 1200 in the first embodiment.

[0064] As shown in FIG. 3 , the second region 320 may be located only outside the region where the electrode layer 100 and the counter electrode layer 200 face each other. This allows the second region 320 to be located farther away from the center of the battery. This further enhances the heat dissipation performance of the second region 320. Furthermore, the area of the first region 310 located within the region where the electrode layer 100 and the counter electrode layer 200 face each other can be made larger. That is, the first region 310, which is responsible for the propagation of metal ions between the electrode layer 100 and the counter electrode layer 200, can be located over a larger area.

[0065] As described above, in the present disclosure, "the second region 320 is located closer to the outer periphery of the region where the electrode layer 100 and the counter electrode layer 200 face each other than the first region 310" encompasses the configurations shown in Figures 1 to 3 above (i.e., the arrangement configuration of the second region 320).

[0066] In the present disclosure, the "region where the electrode layer 100 and the counter electrode layer 200 face each other" refers to, for example, For example, it encompasses the meaning of "a region (i.e., an overlapping region) in which a part of the main surface of the electrode layer 100 (or the entire area of the main surface) overlaps with a part of the main surface of the counter electrode layer 200 (or the entire area of the main surface) when viewed from the stacking direction of the electrode layer 100 and the counter electrode layer 200 (i.e., the z direction in the figure)."

[0067] In the present disclosure, the term "a configuration in which the electrode layer 100 and the counter electrode layer 200 face each other" encompasses, for example, the meaning of "a configuration in which another member (e.g., a solid electrolyte layer 300, etc.) is disposed between the main surfaces of the electrode layer 100 and the counter electrode layer 200 that face each other."

[0068] 1 to 3, second region 320 may be disposed on only one end of solid electrolyte layer 300. For example, if solid electrolyte layer 300 has a rectangular shape (e.g., a square shape) as shown in FIGS. 1 to 3, second region 320 may be disposed on only one side of the shape.

[0069] Alternatively, second region 320 may be disposed on two or more of the ends of solid electrolyte layer 300. For example, if solid electrolyte layer 300 has a rectangular shape (e.g., a square shape) as shown in Figures 1 to 3, second region 320 may be disposed on two or more sides of the shape. This makes it possible to improve heat dissipation (and strength, environmental resistance, etc.) at two or more ends.

[0070] (Embodiment 2) The following describes the second embodiment. Explanations that overlap with the first embodiment will be omitted where appropriate.

[0071] FIG. 4 is a diagram showing a schematic configuration of a battery 2000 according to the second embodiment.

[0072] FIG. 4(a) is an xz view (cross-sectional view taken along line 4A) showing a schematic configuration of a battery 2000 in accordance with the second embodiment.

[0073] FIG. 4(b) is an xy diagram (top perspective view) showing a schematic configuration of the battery 2000 in the second embodiment.

[0074] The battery 2000 in the second embodiment further comprises the following components in addition to the components of the battery 1000 in the first embodiment described above.

[0075] That is, in battery 2000 according to the second embodiment, second region 320 is positioned so as to surround first region 310.

[0076] According to the above configuration, it is possible to increase the density of the solid electrolyte material in the four outer peripheral portions (e.g., all of the outer peripheral portions) of the solid electrolyte layer 300. This makes it easier for heat from the central portion of the solid electrolyte layer 300 to propagate (diffuse) to the outer peripheral portions of the solid electrolyte layer 300 that are closer to the respective heat-generating portions. This makes it possible to more easily dissipate heat generated in the central portion of the battery (e.g., heat generated in the first region 310, the electrode layer 100, or the counter electrode layer 200) to the surface of the solid electrolyte layer 300 (and to the outside of the battery).

[0077] Furthermore, with the above configuration, the second region 320, which has a higher strength, can cover the four outer edges (for example, the entire outer edge) of the first region 310. Therefore, the second region 320 can further suppress damage to the four outer edges of the first region 310, which has a relatively weak strength (for example, collapse of the first solid electrolyte material, etc.). Therefore, the strength of the battery can be further improved. can be done.

[0078] Furthermore, with the above configuration, the second region 320, which has a higher solid electrolyte material density, can be interposed between the four outer edges of the first region 310 and the outside of the battery (e.g., outside air). This makes it possible, for example, for the second region 320 to block the passage of outside air (e.g., air, moisture, etc.) to the four outer edges of the first region 310. This further improves the environmental resistance of the battery.

[0079] As shown in FIG. 4, the second region 320 may be located only in the region where the electrode layer 100 and the counter electrode layer 200 face each other.

[0080] FIG. 5 is a diagram showing a schematic configuration of a battery 2100 according to the second embodiment.

[0081] FIG. 5(a) is an xz diagram (sectional view taken along line 5A) showing a schematic configuration of a battery 2100 according to the second embodiment.

[0082] FIG. 5(b) is an xy diagram (top perspective view) showing a schematic configuration of the battery 2100 in the second embodiment.

[0083] 5, the second region 320 may be located both within the region where the electrode layer 100 and the counter electrode layer 200 face each other and outside the region where the electrode layer 100 and the counter electrode layer 200 face each other. This allows the second region 320 to be located on all four sides of the battery and further away from the center of the battery. This further improves the heat dissipation properties of the second region 320.

[0084] The second region 320 may be a region located in contact with at least one of the electrode layer 100 and the counter electrode layer 200. For example, as shown in Fig. 4 or 5, the second region 320 may be a region located in contact with both the electrode layer 100 and the counter electrode layer 200.

[0085] FIG. 6 is a diagram showing a schematic configuration of a battery 2200 according to the second embodiment.

[0086] FIG. 6(a) is an xz diagram (sectional view taken along line 6A) showing a schematic configuration of a battery 2200 in the second embodiment.

[0087] FIG. 6(b) is an xy diagram (top perspective view) showing a schematic configuration of the battery 2200 in the second embodiment.

[0088] As shown in FIG. 6, the second region 320 may be located only outside the region where the electrode layer 100 and the counter electrode layer 200 face each other. This allows the second region 320 to be located farther away from the center of the battery. This further enhances the heat dissipation performance of the second region 320. Furthermore, the area of the first region 310 located within the region where the electrode layer 100 and the counter electrode layer 200 face each other can be made larger. In other words, the first region 310, which is responsible for the propagation of metal ions between the electrode layer 100 and the counter electrode layer 200, can be arranged over a larger area.

[0089] As described above, in the present disclosure, "the second region 320 is positioned so as to surround the first region 310" encompasses the configurations shown in FIGS. 4 to 6 (i.e., the arrangement configuration of the second region 320). That is, "the second region 320 is positioned so as to surround the first region 310" encompasses, for example, the meaning that "the second region 320 is positioned so as to contact all of the edges of the first region 310." That is, for example, if the first region 310 has a rectangular shape (e.g., a quadrangle shape) as shown in FIGS. 4 to 6, the second region 320 may be positioned so as to contact all of the sides of that shape. For example, the outer peripheral side surface of the first region 310 may be positioned so as to contact the second region 320. 0 may be joined to the inner peripheral side surface.

[0090] (Embodiment 3) The following describes the third embodiment. Explanations that overlap with the first or second embodiment will be omitted as appropriate.

[0091] FIG. 7 is a diagram showing a schematic configuration of a battery 3000 according to the third embodiment.

[0092] FIG. 7(a) is an xz view (7A cross-sectional view) showing a schematic configuration of a battery 3000 according to the third embodiment.

[0093] FIG. 7(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 3000 according to the third embodiment.

[0094] The battery 3000 in the third embodiment further comprises the following components in addition to the components of the battery 1000 in the first embodiment described above.

[0095] That is, in the battery 3000 according to the third embodiment, the second region 320 is located in contact with the edge of the electrode layer 100 (for example, the side surface).

[0096] According to the above configuration, the second region 320, in which the density of the solid electrolyte material is high, can be disposed in contact with the outer edge portion (for example, at least one end portion) of the electrode layer 100. This makes it easier for heat from the electrode layer 100 to be transmitted (diffused) to the second region 320. This allows heat generated in the central portion of the battery (i.e., heat generated in the electrode layer 100) to be more easily dissipated to the surface of the solid electrolyte layer 300 (and to the outside of the battery).

[0097] Furthermore, with the above configuration, the outer edge portion (e.g., at least one end portion) of the electrode layer 100 can be covered by the second region 320, which has higher strength. Therefore, damage to the outer edge portion of the electrode layer 100, which has relatively low strength (e.g., collapse of the electrode material), can be further suppressed by the second region 320. Therefore, the strength of the battery can be further improved.

[0098] Furthermore, with the above configuration, the second region 320, which has a higher density of solid electrolyte material, can be interposed between the outer edge portion of the electrode layer 100 and the outside of the battery (e.g., outside air). This makes it possible, for example, for the second region 320 to block the passage of outside air (e.g., air, moisture, etc.) to the outer edge portion of the electrode layer 100. This further improves the environmental resistance of the battery.

[0099] 7, the second region 320 may be disposed in contact with only one end of the electrode layer 100. For example, if the electrode layer 100 has a rectangular shape (e.g., a quadrilateral shape) as shown in FIG. 7, the second region 320 may be disposed in contact with only one side of the shape.

[0100] Alternatively, the second region 320 may be disposed in contact with two or more of the ends of the electrode layer 100. For example, if the electrode layer 100 has a rectangular shape (e.g., a square shape) as shown in Fig. 7, the second region 320 may be disposed in contact with two or more sides of the shape. This makes it possible to improve heat dissipation (and strength, environmental resistance, etc.) at two or more ends.

[0101] FIG. 8 is a diagram showing a schematic configuration of a battery 3100 according to the third embodiment.

[0102] FIG. 8(a) is an xz diagram (sectional view taken along line 8A) showing a schematic configuration of a battery 3100 according to the third embodiment.

[0103] FIG. 8(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 3100 according to the third embodiment.

[0104] As shown in FIG. 8, the second region 320 may be located around the periphery of the electrode layer 100 .

[0105] According to the above configuration, the second regions 320, which have a high density of solid electrolyte material, can be arranged in contact with the four outer edge portions (for example, the entire outer edge portion) of the electrode layer 100. This makes it easier for heat from the electrode layer 100 to be transmitted (diffused) to the second regions 320 that are close to the respective heat-generating portions. This makes it possible to more easily dissipate heat generated in the central portion of the battery (i.e., heat generated in the electrode layer 100) to the surface of the solid electrolyte layer 300 (and to the outside of the battery).

[0106] Furthermore, with the above configuration, the second region 320, which has higher strength, can cover the four outer edge portions (e.g., the entire outer edge) of the electrode layer 100. Therefore, the second region 320 can further suppress damage (e.g., collapse of the electrode material) to the four outer edge portions of the electrode layer 100, which have relatively weak strength. Therefore, the strength of the battery can be further improved.

[0107] Furthermore, with the above configuration, the second region 320, which has a higher density of solid electrolyte material, can be interposed between the four outer edge portions of the electrode layer 100 and the outside of the battery (e.g., the outside air). This makes it possible, for example, for the second region 320 to block the passage of outside air (e.g., air, moisture, etc.) to the four outer edge portions of the electrode layer 100. This further improves the environmental resistance of the battery.

[0108] FIG. 9 is a diagram showing a schematic configuration of a battery 3200 according to the third embodiment.

[0109] FIG. 9(a) is an xz diagram (sectional view taken along line 9A) showing a schematic configuration of a battery 3200 according to the third embodiment.

[0110] FIG. 9(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 3200 according to the third embodiment.

[0111] The battery 3200 according to the third embodiment further includes the following components in addition to the components of the battery 3000 according to the third embodiment described above.

[0112] That is, in the battery 3200 according to the third embodiment, the second region 320 is located in contact with the end portion (for example, the side surface) of the counter electrode layer 200.

[0113] According to the above configuration, the second region 320 having a high density of the solid electrolyte material can be disposed in contact with the outer edge portion (for example, at least one end portion) of the counter electrode layer 200. This makes it easier for heat from the counter electrode layer 200 to be transmitted (diffused) to the second region 320. This makes it easier for heat generated in the central portion of the battery (i.e., heat generated in the counter electrode layer 200) to be dissipated to the surface of the solid electrolyte layer 300 (and to the outside of the battery).

[0114] Furthermore, according to the above configuration, the second region 320 having higher strength can effectively prevent the outer surface of the counter electrode layer 200 from being damaged. The edge portion (e.g., at least one end portion) can be covered. Therefore, damage to the outer edge portion of the counter electrode layer 200, which has a relatively weak strength (e.g., collapse of the counter electrode material, etc.), can be further suppressed by the second region 320. Therefore, the strength of the battery can be further improved.

[0115] Furthermore, with the above configuration, the second region 320, which has a higher solid electrolyte material density, can be interposed between the outer edge portion of the counter electrode layer 200 and the outside of the battery (e.g., outside air). This makes it possible, for example, for the second region 320 to block the passage of outside air (e.g., air, moisture, etc.) to the outer edge portion of the counter electrode layer 200. This further improves the environmental resistance of the battery.

[0116] 9, the second region 320 may be disposed in contact with only one end of the counter electrode layer 200. For example, if the counter electrode layer 200 has a rectangular shape (e.g., a quadrilateral shape) as shown in FIG. 9, the second region 320 may be disposed in contact with only one side of the shape.

[0117] Alternatively, the second region 320 may be disposed in contact with two or more of the ends of the counter electrode layer 200. For example, if the counter electrode layer 200 has a rectangular shape (e.g., a quadrilateral shape) as shown in Fig. 9, the second region 320 may be disposed in contact with two or more sides of the shape. This makes it possible to improve heat dissipation (and strength, environmental resistance, etc.) at two or more ends.

[0118] FIG. 10 is a diagram showing a schematic configuration of a battery 3300 according to the third embodiment.

[0119] FIG. 10(a) is an xz diagram (cross-sectional view taken along line 10A) showing a schematic configuration of a battery 3300 according to the third embodiment.

[0120] FIG. 10(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 3300 according to the third embodiment.

[0121] As shown in FIG. 10, the second region 320 may be located around the counter electrode layer 200 .

[0122] According to the above configuration, the second region 320 having a high density of solid electrolyte material can be disposed in contact with the four outer edge portions (for example, the entire outer edge portion) of the counter electrode layer 200. This makes it easier for heat from the counter electrode layer 200 to be transmitted (diffused) to the second region 320 close to each heat-generating portion. This makes it possible to more easily dissipate heat generated in the central portion of the battery (i.e., heat generated in the counter electrode layer 200) to the surface of the solid electrolyte layer 300 (and to the outside of the battery).

[0123] Furthermore, with the above configuration, the second region 320, which has higher strength, can cover the four outer edge portions (e.g., the entire outer edge) of the counter electrode layer 200. Therefore, the second region 320 can further suppress damage (e.g., collapse of the counter electrode material) to the four outer edge portions of the counter electrode layer 200, which have relatively weak strength. This can further improve the strength of the battery.

[0124] Furthermore, with the above configuration, the second region 320, which has a higher density of solid electrolyte material, can be interposed between the four outer edge portions of the counter electrode layer 200 and the outside of the battery (for example, the outside air). This makes it possible, for example, for the second region 320 to block the passage of outside air (for example, air, moisture, etc.) to the four outer edge portions of the counter electrode layer 200. This improves the environmental durability of the battery. The boundary can be further improved.

[0125] In the present disclosure, "the second region 320 is located so as to surround the electrode layer 100 (or the counter electrode layer 200)" encompasses, for example, the meaning of "the second region 320 is arranged so as to contact all of the edges of the electrode layer 100 (or the counter electrode layer 200)." That is, for example, if the electrode layer 100 (or the counter electrode layer 200) has a rectangular shape (e.g., a quadrilateral shape), the second region 320 may be arranged so as to contact all of the sides of the shape.

[0126] 7 to 10, the second region 320 may also be located within the region where the electrode layer 100 and the counter electrode layer 200 face each other. Alternatively, the second region 320 may be located only outside the region where the electrode layer 100 and the counter electrode layer 200 face each other.

[0127] FIG. 11 is a diagram showing a schematic configuration of a battery 3400 according to the third embodiment.

[0128] FIG. 11(a) is an xz diagram (cross-sectional view taken along line 11A) showing a schematic configuration of a battery 3400 according to the third embodiment.

[0129] FIG. 11(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 3400 according to the third embodiment.

[0130] As shown in FIG. 11, the first region 310 may have a first protruding portion 311 .

[0131] The first protruding portion 311 is a portion that protrudes outside the region where the electrode layer 100 and the counter electrode layer 200 face each other.

[0132] In this case, the second region 320 may be positioned so as to cover the first protruding portion 311 .

[0133] According to the above configuration, the contact area between the first region 310 and the second region 320 can be increased. This makes it easier for heat from the central portion of the solid electrolyte layer 300 to be propagated (diffused) to the outer edge portion of the solid electrolyte layer 300. This makes it easier for heat generated in the central portion of the battery (for example, heat generated in the first region 310, the electrode layer 100, or the counter electrode layer 200) to be dissipated to the surface of the solid electrolyte layer 300 (and to the outside of the battery).

[0134] As shown in FIG. 11, the second region 320 may be located in contact with an end (for example, a side surface) of the electrode layer 100 and an end (for example, a side surface) of the counter electrode layer 200.

[0135] FIG. 12 is a diagram showing a schematic configuration of a battery 3500 according to the third embodiment.

[0136] FIG. 12(a) is an xz diagram (cross-sectional view taken along line 12A) showing a schematic configuration of a battery 3500 according to the third embodiment.

[0137] FIG. 12(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 3500 according to the third embodiment.

[0138] As shown in FIG. 12, the first protruding portion 311 may be located around the area where the electrode layer 100 and the counter electrode layer 200 face each other.

[0139] In this case, the second region 320 may be positioned so as to cover the first protruding portion 311 exposed around the region where the electrode layer 100 and the counter electrode layer 200 face each other.

[0140] According to the above configuration, the contact area between the first region 310 and the second region 320 can be increased. This makes it easier for heat from the central portion of the solid electrolyte layer 300 to be propagated (diffused) to the outer edge portions of the solid electrolyte layer 300 that are closer to the respective heat-generating portions. This makes it easier for heat generated in the central portion of the battery (for example, heat generated in the first region 310, the electrode layer 100, or the counter electrode layer 200) to be dissipated to the surface of the solid electrolyte layer 300 (and to the outside of the battery).

[0141] As shown in FIG. 12, the second region 320 may be located so as to surround the electrode layer 100 and the counter electrode layer 200.

[0142] (Fourth embodiment) The fourth embodiment will be described below. Descriptions that overlap with any of the first to third embodiments will be omitted as appropriate.

[0143] FIG. 13 is a diagram showing a schematic configuration of a battery 4000 according to the fourth embodiment.

[0144] FIG. 13(a) is an xz diagram (cross-sectional view taken along line 13A) showing a schematic configuration of a battery 4000 according to the fourth embodiment.

[0145] FIG. 13(b) is an xy diagram (top perspective view) showing a schematic configuration of the battery 4000 according to the fourth embodiment.

[0146] The battery 4000 in the fourth embodiment further comprises the following components in addition to the components of the battery 1000 in the first embodiment described above.

[0147] That is, the battery 4000 in the fourth embodiment further includes an electrode current collector 400 and a counter electrode current collector 500 .

[0148] The electrode current collector 400 is a current collector that is electrically connected to the electrode layer 100 .

[0149] The counter electrode current collector 500 is a current collector that is electrically connected to the counter electrode layer 200 .

[0150] The second region 320 is located between the electrode current collector 400 and the counter electrode current collector 500 and in contact with the electrode current collector 400 and the counter electrode current collector 500 .

[0151] According to the above configuration, the electrode current collector 400 and the counter electrode current collector 500 can be prevented from coming into contact with each other and causing a short circuit. That is, the second region 320, which has a high density of the solid electrolyte material (i.e., high strength), can function as a high-strength skeletal structure in the outer edge portion of the solid electrolyte layer 300 (in other words, the outer edge portions of the electrode current collector 400 and the counter electrode current collector 500). As a result, the second region 320 can prevent the outer edge portions of the electrode current collector 400 and the counter electrode current collector 500 from being deformed or having structural defects. Therefore, even in a battery with a large area and a thin layer (e.g., a battery designed for high output and high capacity) or an all-solid-state battery without a separator, the second region 320 can prevent the electrode current collector 400 and the counter electrode current collector 500 from coming into contact with each other and causing a short circuit. This can further improve the deformation resistance and impact resistance of the battery.

[0152] 13, the electrode current collector 400 may be electrically connected to the electrode layer 100 by being in direct contact with the electrode layer 100. Alternatively, another conductive member may be interposed between the electrode current collector 400 and the electrode layer 100.

[0153] 13 , the electrode current collector 400 may be a member larger than the electrode layer 100. For example, the area of the main surface of the electrode current collector 400 may be larger than the area of the main surface of the electrode layer 100. In other words, the electrode layer 100 may be formed in an area smaller than the electrode current collector 400.

[0154] 13 , the counter electrode current collector 500 may be in direct contact with the counter electrode layer 200, thereby being electrically connected to the counter electrode layer 200. Alternatively, another conductive member may be interposed between the counter electrode current collector 500 and the counter electrode layer 200.

[0155] 13 , the counter electrode current collector 500 may be a member larger than the counter electrode layer 200. For example, the area of the main surface of the counter electrode current collector 500 may be larger than the area of the main surface of the counter electrode layer 200. In other words, the counter electrode layer 200 may be formed in an area smaller than the counter electrode current collector 500.

[0156] As shown in FIG. 13, the second region 320 may be disposed in a region where the electrode current collector 400 and the counter electrode current collector 500 face each other without the electrode layer 100 and the counter electrode layer 200 interposed therebetween, among the regions where the electrode current collector 400 and the counter electrode current collector 500 face each other.

[0157] In the present disclosure, the term "region where the electrode current collector 400 and the counter electrode current collector 500 face each other" encompasses, for example, the meaning of "a region where, when viewed from the stacking direction of the electrode current collector 400 and the counter electrode current collector 500 (i.e., the z direction in the figure), a part of the main surface of the electrode current collector 400 (or the entire area of the main surface) overlaps with a part of the main surface of the counter electrode current collector 500 (or the entire area of the main surface) (i.e., an overlapping region)."

[0158] In the present disclosure, the term "a configuration in which the electrode current collector 400 and the counter electrode current collector 500 face each other" encompasses, for example, the meaning of "a configuration in which another member (e.g., the electrode layer 100, the counter electrode layer 200, the solid electrolyte layer 300, etc.) is disposed between the main surfaces of the electrode current collector 400 and the counter electrode current collector 500, which face each other."

[0159] The electrode layer 100 may be a positive electrode layer. In this case, the electrode active material is a positive electrode active material. The electrode current collector 400 is a positive electrode current collector. The counter electrode layer 200 is a negative electrode layer. The counter electrode active material is a negative electrode active material. The counter electrode current collector 500 is a negative electrode current collector.

[0160] Alternatively, the electrode layer 100 may be a negative electrode layer. In this case, the electrode active material is a negative electrode active material. The electrode current collector 400 is a negative electrode current collector. The counter electrode layer 200 is a positive electrode layer. The counter electrode active material is a positive electrode active material. The counter electrode current collector 500 is a positive electrode current collector.

[0161] The positive electrode current collector may be a metal film (e.g., metal foil) made of a metal material (e.g., aluminum, copper, stainless steel, etc.). Alternatively, a metal film made of an alloy containing these metal materials may be used. Alternatively, a positive electrode current collector may be formed by forming (or laminating) these metal materials onto a film made of a different material.

[0162] The thickness of the positive electrode current collector may be, for example, 5 to 100 μm.

[0163] As the negative electrode current collector, a metal film (e.g., metal foil) made of a metal material (e.g., nickel, copper, stainless steel, etc.) can be used. Also, as the negative electrode current collector, a metal film made of an alloy containing these metal materials can be used. Also, as the negative electrode current collector, a film formed by forming these metal materials on a film made of another different material (or by laminating them) can be used. (a combination of these) can be used.

[0164] The thickness of the negative electrode current collector may be, for example, 5 to 100 μm.

[0165] 13, the second region 320 may be disposed on only one end of the electrode current collector 400 (and the counter electrode current collector 500). For example, if the electrode current collector 400 (and the counter electrode current collector 500) has a rectangular shape (e.g., a quadrilateral shape) as shown in FIG. 13, the second region 320 may be disposed on only one side of the shape.

[0166] Alternatively, the second region 320 may be disposed on two or more of the ends of the electrode current collector 400 (and the counter electrode current collector 500). For example, if the electrode current collector 400 (and the counter electrode current collector 500) has a rectangular shape (e.g., a quadrangle shape) as shown in Fig. 13, the second region 320 may be disposed on two or more sides of the shape. This makes it possible to prevent the electrode current collector 400 and the counter electrode current collector 500 from coming into contact with each other at two or more ends, causing a short circuit.

[0167] FIG. 14 is a diagram showing a schematic configuration of a battery 4100 according to the fourth embodiment.

[0168] FIG. 14(a) is an xz diagram (cross-sectional view taken along line 14A) showing a schematic configuration of a battery 4100 according to the fourth embodiment.

[0169] FIG. 14(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 4100 according to the fourth embodiment.

[0170] 14, the second region 320 may be located so as to surround the first region 310, the electrode layer 100, and the counter electrode layer 200. In this case, the second region 320 surrounding the first region 310, the electrode layer 100, and the counter electrode layer 200 may be located so as to be in contact with the electrode current collector 400 and the counter electrode current collector 500. This makes it possible to prevent the electrode current collector 400 and the counter electrode current collector 500 from coming into contact with each other and causing a short circuit around (for example, on all four sides of) the laminate of the first region 310, the electrode layer 100, and the counter electrode layer 200.

[0171] FIG. 15 is a diagram showing a schematic configuration of a battery 4200 according to the fourth embodiment.

[0172] FIG. 15(a) is an xz diagram (cross-sectional view taken along line 15A) showing a schematic configuration of a battery 4200 according to the fourth embodiment.

[0173] FIG. 15(b) is an xy diagram (top perspective view) showing a schematic configuration of the battery 4200 according to the fourth embodiment.

[0174] As shown in FIG. 15, the first region 310 may be disposed in a region where the electrode layer 100 and the counter electrode layer 200 face each other.

[0175] 15 , the second region 320 may be disposed in the entire region where the electrode current collector 400 and the counter electrode current collector 500 face each other, without the electrode layer 100 and the counter electrode layer 200 in between. This further prevents the electrode current collector 400 and the counter electrode current collector 500 from coming into contact with each other and causing a short circuit around (for example, on all four sides of) the laminate of the first region 310, the electrode layer 100, and the counter electrode layer 200.

[0176] FIG. 16 is a diagram showing a schematic configuration of a battery 4300 according to the fourth embodiment.

[0177] FIG. 16(a) is an xz diagram (cross-sectional view taken along line 16A) showing a schematic configuration of a battery 4300 according to the fourth embodiment.

[0178] FIG. 16(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 4300 according to the fourth embodiment.

[0179] As shown in FIG. 16, the second distance D2 may be smaller than the first distance D1.

[0180] Here, the first distance D1 is the distance between the electrode current collector 400 and the counter electrode current collector 500 at the position where the first region 310 is disposed.

[0181] The second distance D2 is the distance between the electrode current collector 400 and the counter electrode current collector 500 at the position where the second region 320 is disposed.

[0182] According to the above configuration, a battery can be configured in which the outer peripheral portion of the solid electrolyte layer 300 (in other words, the outer peripheral portion between the electrode current collector 400 and the counter electrode current collector 500) is narrowed (i.e., a battery in which the outer peripheral side surface is narrowed). This reduces the exposed area of the outer peripheral portion of the solid electrolyte layer 300. Therefore, for example, the second region 320 can more reliably block the passage of outside air (e.g., air, moisture, etc.) to the first region 310. In addition, the durability (e.g., impact resistance) of the outer peripheral side surface of the battery can be further improved. This can further improve the environmental resistance of the battery.

[0183] (Embodiment 5) The fifth embodiment will be described below. Descriptions that overlap with any of the first to fourth embodiments will be omitted as appropriate.

[0184] FIG. 17 is a diagram showing a schematic configuration of a battery 5000 according to the fifth embodiment.

[0185] FIG. 17(a) is an xz view (cross-sectional view taken along line 17A) showing a schematic configuration of a battery 5000 according to the fifth embodiment.

[0186] FIG. 17(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 5000 according to the fifth embodiment.

[0187] The battery 5000 in the fifth embodiment further includes the following components in addition to the components of the battery 1000 in the first embodiment described above.

[0188] That is, in the battery 5000 according to the fifth embodiment, the area where the counter electrode layer 200 is formed is larger than the area where the electrode layer 100 is formed.

[0189] At this time, the electrode layer 100 is located within the area where the counter electrode layer 200 is formed.

[0190] According to the above configuration, the counter electrode layer 200 is formed to have a larger area than the electrode layer 100, which makes it possible to suppress deposition of metal (e.g., lithium) in the counter electrode layer 200. This makes it possible to prevent a short circuit between the electrode layer 100 and the counter electrode layer 200 caused by deposition of metal.

[0191] The counter electrode layer 200 may be a member larger than the electrode layer 100. For example, the area of the main surface of the counter electrode layer 200 may be larger than the area of the main surface of the electrode layer 100. That is, the electrode layer 100 may be formed in an area smaller than the counter electrode layer 200. For example, as shown in FIG. 17 , one end of the counter electrode layer 200 may be larger than the electrode layer 100. In this case, the end portion may be disposed so as not to face the electrode layer 100.

[0192] FIG. 18 is a diagram showing a schematic configuration of a battery 5100 according to the fifth embodiment.

[0193] FIG. 18(a) is an xz diagram (cross-sectional view 18A) showing a schematic configuration of a battery 5100 according to the fifth embodiment.

[0194] FIG. 18(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 5100 according to the fifth embodiment.

[0195] 18, the four ends (for example, all ends) of the counter electrode layer 200 may be arranged so as not to face the electrode layer 100. This can further suppress the deposition of metal (for example, lithium) in the counter electrode layer 200. Therefore, it is possible to more reliably prevent a short circuit between the electrode layer 100 and the counter electrode layer 200 caused by the deposition of metal.

[0196] As shown in Figures 17 and 18, a second region 320 may be arranged in a region facing the counter electrode layer 200 where the electrode layer 100 is not located (for example, a region where the counter electrode layer 200 and the electrode current collector 400 face each other without the electrode layer 100 interposed therebetween).

[0197] FIG. 19 is a diagram showing a schematic configuration of a battery 5200 according to the fifth embodiment.

[0198] FIG. 19(a) is an xz diagram (cross-sectional view taken along line 19A) showing a schematic configuration of a battery 5200 according to the fifth embodiment.

[0199] FIG. 19(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 5200 according to the fifth embodiment.

[0200] 19, a first region 310 may be disposed in a region facing the counter electrode layer 200 where the electrode layer 100 is not located (for example, a region where the counter electrode layer 200 and the electrode current collector 400 face each other without the electrode layer 100 interposed therebetween). This allows the area of the first region 310 located in the region where the electrode layer 100 and the counter electrode layer 200 face each other to be increased. That is, the first region 310 responsible for the propagation of metal ions between the electrode layer 100 and the counter electrode layer 200 can be disposed over a larger area. This allows the deposition of metal (for example, lithium) in the counter electrode layer 200 to be further suppressed.

[0201] FIG. 20 is a diagram showing a schematic configuration of a battery 5300 according to the fifth embodiment.

[0202] FIG. 20(a) is an xz diagram (cross-sectional view taken along line 20A) showing a schematic configuration of a battery 5300 according to the fifth embodiment.

[0203] FIG. 20(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 5300 according to the fifth embodiment.

[0204] 20 , the second region 320 may be disposed only in a region facing the counter electrode layer 200 where the electrode layer 100 is not located (for example, a region where the counter electrode layer 200 and the electrode current collector 400 face each other without the electrode layer 100 interposed therebetween). In other words, the second region 320 does not need to be provided in a region where the electrode current collector 400 and the counter electrode current collector 500 face each other without the electrode layer 100 and the counter electrode layer 200 interposed therebetween, among regions where the electrode current collector 400 and the counter electrode current collector 500 face each other.

[0205] (Sixth embodiment) The sixth embodiment will be described below. Descriptions that overlap with any of the first to fifth embodiments will be omitted as appropriate.

[0206] FIG. 21 is a diagram showing a schematic configuration of a battery 6000 according to the sixth embodiment.

[0207] FIG. 21(a) is an xz view (cross-sectional view 21A) showing a schematic configuration of a battery 6000 according to the sixth embodiment.

[0208] FIG. 21(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 6000 according to the sixth embodiment.

[0209] The battery 6000 according to the sixth embodiment further comprises the following components in addition to the components of the battery 1000 according to the first embodiment.

[0210] That is, in battery 6000 according to the sixth embodiment, solid electrolyte layer 300 has third region 330.

[0211] The third region 330 is a region containing a third solid electrolyte material.

[0212] The third region 330 is located adjacent to the second region 320 .

[0213] The second region 320 is located between the first region 310 and the third region 330 .

[0214] The third density is higher than the second density.

[0215] Here, the third density is the density of the third solid electrolyte material in the third region 330.

[0216] According to the above configuration, the density of the solid electrolyte material in the first region 310, the second region 320, and the third region 330 can be varied in stages. That is, the density of the solid electrolyte material can be increased in stages from the center of the solid electrolyte layer 300 toward the outer edge. That is, by interposing the second region 320 between the first region 310 and the third region 330, the difference in the density of the solid electrolyte material between the contacting regions can be reduced compared to when the first region 310 and the third region 330 are in direct contact. This allows the physical properties (e.g., thermal expansion coefficient) of the contacting regions to be closer to each other. This improves the interfacial consistency and adhesion at the contact portions between the first region 310, the second region 320, and the third region 330. That is, the occurrence of structural defects that impede heat transport between the first region 310, the second region 320, and the third region 330 can be further suppressed. This allows heat generated in the central portion of the battery (e.g., heat generated in the first region 310, the electrode layer 100, or the counter electrode layer 200) to be more easily dissipated via the second region 320 to the surface of the third region 330 and the solid electrolyte layer 300 (and to the outside of the battery).

[0217] Furthermore, with the above configuration, by interposing the second region 320 between the first region 310 and the third region 330, the difference in density of the solid electrolyte material between the first region 310 and the third region 330 can be set to be larger. That is, the density of the third solid electrolyte material in the third region 330 can be made sufficiently large. This allows the third region 330, which has a higher density of the solid electrolyte material, to be disposed at the outer edge of the solid electrolyte layer 300. Therefore, heat generated in the central portion of the battery can be more easily dissipated to the surface of the solid electrolyte layer 300 (and to the outside of the battery) via the third region 330.

[0218] The electrode layer 100 may contain an electrode active material.

[0219] The counter electrode layer 200 may also contain a counter electrode active material.

[0220] In this case, both the density of the electrode active material and the density of the counter electrode active material in the first region 310 may be lower than the first density.

[0221] In addition, both the density of the electrode active material and the density of the counter electrode active material in the second region 320 may be lower than the second density.

[0222] In addition, both the density of the electrode active material and the density of the counter electrode active material in the third region 330 may be lower than the third density.

[0223] According to the above configuration, the first region 310, the second region 320, and the third region 330 can be arranged in a portion where the density of the electrode active material and the counter electrode active material is low (i.e., a portion located closer to the center of the solid electrolyte layer 300, away from both the electrode layer 100 and the counter electrode layer 200). In other words, the first region 310, the second region 320, and the third region 330, which have high heat dissipation properties, can be arranged in a more central portion inside the battery. This makes it easier for heat generated in the central portion of the battery to be transmitted to the outer edge portion of the battery, compared to a configuration in which heat dissipation members are provided only in positions closer to the electrode layer 100 side (or only in positions closer to the counter electrode layer 200 side).

[0224] The first region 310, the second region 320, and the third region 330 may be regions that do not contain an electrode active material or a counter electrode active material.

[0225] According to the above configuration, the first region 310, the second region 320, and the third region 330 can be arranged in a portion that does not contain the electrode active material and the counter electrode active material (i.e., a portion located closer to the center of the solid electrolyte layer 300, away from both the electrode layer 100 and the counter electrode layer 200). That is, the first region 310, the second region 320, and the third region 330, which have high heat dissipation properties, can be arranged in a more central portion inside the battery. This makes it easier for heat generated in the central portion of the battery to be transmitted to the outer edge portion of the battery, compared to a configuration in which heat dissipation members are provided only in positions closer to the electrode layer 100 side (or only in positions closer to the counter electrode layer 200 side).

[0226] As the third solid electrolyte material, the above-mentioned solid electrolytes that can be used as the first solid electrolyte material can be used.

[0227] The first, second, and third solid electrolyte materials may be different from one another, which allows, for example, the second and third solid electrolyte materials to be solid electrolyte materials with high heat dissipation properties, while the first solid electrolyte material to be a solid electrolyte material with high metal ion conductivity.

[0228] Alternatively, the first solid electrolyte material, the second solid electrolyte material, and the third solid electrolyte material may be the same material.

[0229] According to the above configuration, the first region 310, the second region 320, and the third region 330 can contain the same solid electrolyte material. This allows the physical property values (e.g., thermal expansion coefficients) of the first region 310, the second region 320, and the third region 330 to be closer to each other. Therefore, the respective connections of the first region 310, the second region 320, and the third region 330 can be made closer to each other. This can further improve the interfacial consistency and adhesion at the contact portions. That is, the occurrence of structural defects that inhibit heat transport between the first region 310, the second region 320, and the third region 330 can be further suppressed. This allows heat generated in the central portion of the battery (e.g., heat generated in the first region 310, the electrode layer 100, or the counter electrode layer 200) to be more easily dissipated to the surface of the solid electrolyte layer 300 (and to the outside of the battery) via the second region 320 and the third region 330. Furthermore, for example, when the first region 310, the second region 320, and the third region 330 are made of the same material, the battery manufacturing process (e.g., mixing the mixture, applying the mixture, etc.) can be further simplified.

[0230] The third solid electrolyte material may be configured as particles. In this case, the third region 330 is a region containing particles of the third solid electrolyte material. In this case, the third density is the density of the particles of the third solid electrolyte material in the third region 330.

[0231] 21, the third region 330 may be located only outside the region where the electrode layer 100 and the counter electrode layer 200 face each other. Alternatively, the third region 330 may be located both inside the region where the electrode layer 100 and the counter electrode layer 200 face each other and outside the region where the electrode layer 100 and the counter electrode layer 200 face each other. This allows the third region 330 to be located further away from the center of the battery. This further improves the heat dissipation properties of the third region 330.

[0232] Alternatively, the third region 330 may be located only in the region where the electrode layer 100 and the counter electrode layer 200 face each other.

[0233] 21, the third region 330 may be disposed in contact with only one end of the second region 320. For example, if the second region 320 has a rectangular shape (e.g., a quadrangle shape) as shown in Fig. 21, the third region 330 may be disposed in contact with only one side of the shape.

[0234] Alternatively, the third region 330 may be disposed in contact with two or more of the ends of the second region 320. For example, if the second region 320 has a rectangular shape (e.g., a square shape) as shown in Fig. 21, the third region 330 may be disposed in contact with two or more sides of the shape. This makes it possible to improve heat dissipation (and strength, environmental resistance, etc.) at two or more ends.

[0235] FIG. 22 is a diagram showing a schematic configuration of a battery 6100 according to the sixth embodiment.

[0236] FIG. 22(a) is an xz diagram (cross-sectional view 22A) showing a schematic configuration of a battery 6100 according to the sixth embodiment.

[0237] FIG. 22(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 6100 according to the sixth embodiment.

[0238] As shown in FIG. 22, the third region 330 may be located surrounding the second region 320 .

[0239] According to the above configuration, the density of the solid electrolyte material can be increased stepwise from the center of the solid electrolyte layer 300 toward the four outer edge portions (for example, all of the outer edge portions). That is, in the four outer edge portions (for example, all of the outer edge portions) of the solid electrolyte layer 300, the consistency and adhesion of the interfaces at the contact portions between the first region 310, the second region 320, and the third region 330 can be improved. This allows the heat generated in the center portion of the battery (for example, the heat generated in the first region 310, the electrode layer 100, or the counter electrode layer 200) to be reduced. ) can be more easily dissipated via the second region 320 to the surfaces of the third region 330 and the four outer edge portions of the solid electrolyte layer 300 (and to the outside of the battery).

[0240] In the present disclosure, "the third region 330 is positioned so as to surround the second region 320" encompasses, for example, the meaning of "the third region 330 is disposed so as to be in contact with all of the edges of the second region 320." That is, for example, if the outer shape of the second region 320 is a rectangular shape (e.g., a quadrangle shape) as shown in FIG. 22 , the third region 330 may be disposed so as to be in contact with all of the sides of that shape. For example, the outer peripheral side surface of the second region 320 may be joined to the inner peripheral side surface of the third region 330.

[0241] FIG. 23 is a diagram showing a schematic configuration of a battery 6200 according to the sixth embodiment.

[0242] FIG. 23(a) is an xz diagram (cross-sectional view taken along line 23A) showing a schematic configuration of a battery 6200 according to the sixth embodiment.

[0243] FIG. 23(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 6200 according to the sixth embodiment.

[0244] As shown in FIG. 23, the second region 320 may have a second protruding portion 321.

[0245] The second protruding portion 321 is a portion that protrudes outside the region where the electrode layer 100 and the counter electrode layer 200 face each other.

[0246] In this case, the third region 330 may be positioned so as to cover the second protruding portion 321.

[0247] According to the above configuration, the contact area between the second region 320 and the third region 330 can be increased. This makes it easier for heat from the central portion of the solid electrolyte layer 300 to be propagated (diffused) to the outer edge portion of the solid electrolyte layer 300. This makes it easier for heat generated in the central portion of the battery (for example, heat generated in the first region 310, the electrode layer 100, or the counter electrode layer 200) to be dissipated to the surface of the solid electrolyte layer 300 (and to the outside of the battery).

[0248] FIG. 24 is a diagram showing a schematic configuration of a battery 6300 according to the sixth embodiment.

[0249] FIG. 24(a) is an xz view (sectional view taken along line 24A) showing a schematic configuration of a battery 6300 according to the sixth embodiment.

[0250] FIG. 24(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 6300 according to the sixth embodiment.

[0251] As shown in FIG. 24, the second protruding portion 321 may be located around the area where the electrode layer 100 and the counter electrode layer 200 face each other.

[0252] In this case, the third region 330 may be positioned so as to cover the second protruding portion 321 exposed around the region where the electrode layer 100 and the counter electrode layer 200 face each other.

[0253] According to the above configuration, the contact area between the second region 320 and the third region 330 can be increased. This allows heat from the central portion of the solid electrolyte layer 300 to be easily propagated (diffused) to the outer edge portion of the solid electrolyte layer 300 that is close to each heat-generating portion. This allows heat generated in the central portion of the battery (for example, the first region 310 or the electrode layer 100) to be easily dissipated. or heat generated in the counter electrode layer 200) can be more easily dissipated to the surface of the solid electrolyte layer 300 (and to the outside of the battery).

[0254] FIG. 25 is a diagram showing a schematic configuration of a battery 6400 according to the sixth embodiment.

[0255] FIG. 25(a) is an xz view (cross-sectional view taken along line 25A) showing a schematic configuration of a battery 6400 according to the sixth embodiment.

[0256] FIG. 25(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 6400 according to the sixth embodiment.

[0257] As shown in FIG. 25, the first region 310 may have a first protruding portion 311.

[0258] The first protruding portion 311 is a portion that protrudes outside the region where the electrode layer 100 and the counter electrode layer 200 face each other.

[0259] In this case, the second region 320 may be positioned so as to cover the first protruding portion 311 .

[0260] Furthermore, the second region 320 covering the first overhanging portion 311 may have a second overhanging portion 321 .

[0261] The second protruding portion 321 is a portion that protrudes outside the region where the electrode layer 100 and the counter electrode layer 200 face each other.

[0262] In this case, the third region 330 may be positioned so as to cover the second protruding portion 321.

[0263] According to the above configuration, it is possible to increase both the contact area between the first region 310 and the second region 320 and the contact area between the second region 320 and the third region 330. This makes it easier for heat from the central portion of the solid electrolyte layer 300 to be propagated (diffused) to the outer edge portion of the solid electrolyte layer 300. This makes it easier for heat generated in the central portion of the battery (for example, heat generated in the first region 310, the electrode layer 100, or the counter electrode layer 200) to be dissipated to the surface of the solid electrolyte layer 300 (and to the outside of the battery).

[0264] The third region 330 may be located in contact with an end portion (for example, a side surface) of the electrode layer 100.

[0265] According to the above configuration, the third region 330, in which the density of the solid electrolyte material is high, can be disposed in contact with the outer edge portion (for example, at least one end portion) of the electrode layer 100. This makes it easier for heat from the electrode layer 100 to be transmitted (diffused) to the third region 330. This allows heat generated in the central portion of the battery (i.e., heat generated in the electrode layer 100) to be more easily dissipated to the surface of the solid electrolyte layer 300 (and to the outside of the battery).

[0266] Furthermore, with the above configuration, the outer edge portion (e.g., at least one end portion) of the electrode layer 100 can be covered by the stronger third region 330. Therefore, damage to the outer edge portion of the electrode layer 100, which has a relatively weak strength (e.g., collapse of the electrode material), can be more effectively prevented by the third region 330. Therefore, the strength of the battery can be further improved.

[0267] Furthermore, with the above-described configuration, the third region 330, which has a higher density of solid electrolyte material, can be interposed between the outer edge portion of the electrode layer 100 and the outside of the battery (for example, the outside air). As a result, for example, the third region 330 can block the passage of outside air (e.g., atmospheric air, moisture, etc.) to the outer edge portion of the electrode layer 100. This can further improve the environmental resistance of the battery.

[0268] The third region 330 may be disposed in contact with only one end of the electrode layer 100. For example, if the electrode layer 100 has a rectangular shape (e.g., a quadrilateral shape), the third region 330 may be disposed in contact with only one side of the shape.

[0269] Alternatively, the third region 330 may be disposed in contact with two or more of the ends of the electrode layer 100. For example, if the electrode layer 100 has a rectangular shape (e.g., a quadrilateral shape), the third region 330 may be disposed in contact with two or more sides of the shape. This makes it possible to improve heat dissipation (and strength, environmental resistance, etc.) at two or more ends.

[0270] Alternatively, the third region 330 may be located around the electrode layer 100 .

[0271] According to the above configuration, the third region 330, which has a high density of solid electrolyte material, can be arranged in contact with the four outer edge portions (for example, the entire outer edge portion) of the electrode layer 100. This makes it easier for heat from the electrode layer 100 to be transmitted (diffused) to the third region 330 that is close to each heat-generating portion. This makes it possible to more easily dissipate heat generated in the central portion of the battery (i.e., heat generated in the electrode layer 100) to the surface of the solid electrolyte layer 300 (and to the outside of the battery).

[0272] Furthermore, with the above configuration, the stronger third region 330 can cover the four outer edge portions (e.g., the entire outer edge) of the electrode layer 100. Therefore, the third region 330 can further suppress damage (e.g., collapse of the electrode material) to the four outer edge portions of the electrode layer 100, which are relatively weak. Therefore, the strength of the battery can be further improved.

[0273] Furthermore, with the above configuration, the third region 330, which has a higher density of solid electrolyte material, can be interposed between the four outer edge portions of the electrode layer 100 and the outside of the battery (e.g., outside air). This makes it possible, for example, for the third region 330 to block the passage of outside air (e.g., air, moisture, etc.) to the four outer edge portions of the electrode layer 100. This further improves the environmental resistance of the battery.

[0274] The third region 330 may be located in contact with an end portion (for example, a side surface) of the counter electrode layer 200.

[0275] According to the above configuration, the third region 330, in which the density of the solid electrolyte material is high, can be disposed in contact with the outer edge portion (for example, at least one end portion) of the counter electrode layer 200. This makes it easier for heat from the counter electrode layer 200 to be transmitted (diffused) to the third region 330. This makes it easier for heat generated in the central portion of the battery (i.e., heat generated in the counter electrode layer 200) to be dissipated to the surface of the solid electrolyte layer 300 (and to the outside of the battery).

[0276] Furthermore, with the above configuration, the outer edge portion (e.g., at least one end portion) of the counter electrode layer 200 can be covered by the stronger third region 330. Therefore, damage to the outer edge portion of the counter electrode layer 200, which has a relatively weak strength (e.g., collapse of the counter electrode material), can be further suppressed by the third region 330. Therefore, the strength of the battery can be further improved.

[0277] Furthermore, according to the above configuration, the outer edge portion of the counter electrode layer 200 and the outside of the battery (for example, the outside air) A third region 330 having a higher density of solid electrolyte material can be interposed between the counter electrode layer 200 and the counter electrode layer 200. This makes it possible to, for example, block the transmission of outside air (e.g., atmospheric air, moisture, etc.) to the outer edge portion of the counter electrode layer 200 by the third region 330. This makes it possible to further improve the environmental resistance of the battery.

[0278] The third region 330 may be disposed in contact with only one end of the counter electrode layer 200. For example, if the counter electrode layer 200 has a rectangular shape (e.g., a quadrilateral shape), the third region 330 may be disposed in contact with only one side of the shape.

[0279] Alternatively, the third region 330 may be disposed in contact with two or more of the ends of the counter electrode layer 200. For example, if the counter electrode layer 200 has a rectangular shape (e.g., a quadrilateral shape), the third region 330 may be disposed in contact with two or more sides of the shape. This makes it possible to improve heat dissipation (and strength, environmental resistance, etc.) at two or more ends.

[0280] Alternatively, the third region 330 may be located around the counter electrode layer 200 .

[0281] According to the above configuration, the third region 330 having a high density of solid electrolyte material can be disposed in contact with the four outer edge portions (for example, the entire outer edge portion) of the counter electrode layer 200. This makes it easier for heat from the counter electrode layer 200 to be transmitted (diffused) to the third region 330 close to each heat-generating portion. This makes it possible to more easily dissipate heat generated in the central portion of the battery (i.e., heat generated in the counter electrode layer 200) to the surface of the solid electrolyte layer 300 (and to the outside of the battery).

[0282] Furthermore, with the above configuration, the stronger third region 330 can cover the four outer edge portions (e.g., the entire outer edge) of the counter electrode layer 200. Therefore, the third region 330 can further suppress damage (e.g., collapse of the counter electrode material) to the four outer edge portions of the counter electrode layer 200, which are relatively weak in strength. This can further improve the strength of the battery.

[0283] Furthermore, with the above configuration, the third region 330, which has a higher solid electrolyte material density, can be interposed between the four outer edge portions of the counter electrode layer 200 and the outside of the battery (e.g., outside air). This makes it possible, for example, for the third region 330 to block the passage of outside air (e.g., air, moisture, etc.) to the four outer edge portions of the counter electrode layer 200. This further improves the environmental resistance of the battery.

[0284] In the present disclosure, "the third region 330 is located so as to surround the periphery of the electrode layer 100 (or the counter electrode layer 200)" encompasses, for example, the meaning of "the third region 330 is arranged so as to contact all of the edges of the electrode layer 100 (or the counter electrode layer 200)." That is, for example, if the electrode layer 100 (or the counter electrode layer 200) has a rectangular shape (e.g., a quadrilateral shape), the third region 330 may be arranged so as to contact all of the sides of the shape.

[0285] FIG. 26 is a diagram showing a schematic configuration of a battery 6500 according to the sixth embodiment.

[0286] FIG. 26(a) is an xz view (cross-sectional view taken along line 26A) showing a schematic configuration of a battery 6500 according to the sixth embodiment.

[0287] FIG. 26(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 6500 according to the sixth embodiment.

[0288] As shown in FIG. 26, the formation area of the counter electrode layer 200 is larger than the formation area of the electrode layer 100. , it may be large.

[0289] In this case, the electrode layer 100 may be located within the area where the counter electrode layer 200 is formed.

[0290] The second region 320 may also be located in contact with the edge of the electrode layer 100 .

[0291] The third region 330 may also be located in contact with the end of the counter electrode layer 200 .

[0292] According to the above configuration, the counter electrode layer 200 is formed to have a larger area than the electrode layer 100, which makes it possible to suppress deposition of metal (e.g., lithium) in the counter electrode layer 200. This makes it possible to prevent a short circuit between the electrode layer 100 and the counter electrode layer 200 caused by deposition of metal.

[0293] Furthermore, according to the above configuration, the counter electrode layer 200 can be formed to have a larger area than the electrode layer 100 (i.e., while reducing the risk of short-circuiting due to metal deposition), and the third region 330 having a high density of solid electrolyte material can be arranged in contact with the outer edge portion (e.g., at least one end) of the counter electrode layer 200.

[0294] Furthermore, according to the above configuration, the counter electrode layer 200 can be formed to have a larger area than the electrode layer 100 (i.e., while reducing the risk of short-circuiting due to metal deposition), and the second region 320 having a high density of solid electrolyte material can be arranged in contact with the outer edge portion (e.g., at least one end) of the electrode layer 100.

[0295] FIG. 27 is a diagram showing a schematic configuration of a battery 6600 according to the sixth embodiment.

[0296] FIG. 27(a) is an xz diagram (cross-sectional view taken along line 27A) showing a schematic configuration of a battery 6600 according to the sixth embodiment.

[0297] FIG. 27(b) is an xy diagram (top perspective view) showing a schematic configuration of a battery 6600 according to the sixth embodiment.

[0298] As shown in FIG. 27, the second region 320 may be located around the electrode layer 100 .

[0299] In this case, the third region 330 may be located so as to surround the counter electrode layer 200 .

[0300] According to the above configuration, the counter electrode layer 200 can be formed to have a larger area than the electrode layer 100 (i.e., while reducing the risk of short-circuiting due to metal deposition), and the third region 330 having a high density of solid electrolyte material can be arranged in contact with the four outer edge portions (e.g., all of the outer edge portions) of the counter electrode layer 200.

[0301] Furthermore, according to the above configuration, the counter electrode layer 200 can be formed to have a larger area than the electrode layer 100 (i.e., while reducing the risk of short-circuiting due to metal deposition), and the second region 320 having a high density of solid electrolyte material can be arranged in contact with the four outer edge portions (e.g., all of the outer edge portions) of the electrode layer 100.

[0302] FIG. 28 is a diagram showing a schematic configuration of a battery 6700 according to the sixth embodiment.

[0303] FIG. 28 is an xz view (sectional view 28A) showing a schematic configuration of a battery 6700 according to the sixth embodiment.

[0304] FIG. 28 is an xy diagram (top perspective view) showing a schematic configuration of a battery 6700 according to the sixth embodiment.

[0305] 28, the first region 310 may be located so as to surround the electrode layer 100. That is, the second region 320 may be located without contacting the electrode layer 100. This allows the area of the first region 310 located in the region where the electrode layer 100 and the counter electrode layer 200 face each other to be increased. That is, the first region 310 responsible for the propagation of metal ions between the electrode layer 100 and the counter electrode layer 200 can be arranged over a larger area. This allows the deposition of metal (e.g., lithium) in the counter electrode layer 200 to be further suppressed.

[0306] (Embodiment 7) The seventh embodiment will be described below. Descriptions that overlap with any of the first to sixth embodiments will be omitted as appropriate.

[0307] FIG. 29 is a diagram showing a schematic configuration of a battery 7000 according to the seventh embodiment.

[0308] FIG. 29 is an xz view (cross-sectional view taken along line 29A) showing a schematic configuration of a battery 7000 according to the seventh embodiment.

[0309] FIG. 29 is an xy diagram (top perspective view) showing a schematic configuration of a battery 7000 according to the seventh embodiment.

[0310] Battery 7000 in the seventh embodiment further comprises the following components in addition to the components of battery 6000 in the sixth embodiment described above.

[0311] That is, the battery 7000 in the seventh embodiment further includes an electrode current collector 400 and a counter electrode current collector 500 .

[0312] The electrode current collector 400 is a current collector that is electrically connected to the electrode layer 100 .

[0313] The counter electrode current collector 500 is a current collector that is electrically connected to the counter electrode layer 200 .

[0314] The third region 330 is located between the electrode current collector 400 and the counter electrode current collector 500 and in contact with the electrode current collector 400 and the counter electrode current collector 500 .

[0315] According to the above configuration, the electrode current collector 400 and the counter electrode current collector 500 can be prevented from coming into contact with each other and causing a short circuit. That is, the third region 330, which has a high density of the solid electrolyte material (i.e., high strength), can function as a high-strength skeletal structure in the outer edge portion of the solid electrolyte layer 300 (in other words, the outer edge portions of the electrode current collector 400 and the counter electrode current collector 500). As a result, the third region 330 can prevent the outer edge portions of the electrode current collector 400 and the counter electrode current collector 500 from being deformed or having structural defects. Therefore, even in a battery with a large area and a thin layer (e.g., a battery designed for high output and high capacity) or an all-solid-state battery without a separator, the third region 330 can prevent the electrode current collector 400 and the counter electrode current collector 500 from coming into contact with each other and causing a short circuit. This can further improve the deformation resistance and impact resistance of the battery.

[0316] The third region 330 may be disposed in a region where the electrode current collector 400 and the counter electrode current collector 500 face each other without the electrode layer 100 and the counter electrode layer 200 interposed therebetween, among the regions where the electrode current collector 400 and the counter electrode current collector 500 face each other.

[0317] The third region 330 may be disposed on only one end of the electrode current collector 400 (and the counter electrode current collector 500). For example, if the electrode current collector 400 (and the counter electrode current collector 500) has a rectangular shape (e.g., a quadrilateral shape), the third region 330 may be disposed on only one side of the shape.

[0318] Alternatively, the third region 330 may be disposed on two or more of the ends of the electrode current collector 400 (and the counter electrode current collector 500). For example, if the electrode current collector 400 (and the counter electrode current collector 500) has a rectangular shape (e.g., a quadrangle), the third region 330 may be disposed on two or more sides of the shape. This makes it possible to prevent the electrode current collector 400 and the counter electrode current collector 500 from coming into contact with each other at two or more ends and causing a short circuit.

[0319] Alternatively, the third region 330 may be positioned so as to surround the second region 320, the electrode layer 100, and the counter electrode layer 200. In this case, the third region 330 surrounding the second region 320, the electrode layer 100, and the counter electrode layer 200 may be positioned so as to be in contact with the electrode current collector 400 and the counter electrode current collector 500. This makes it possible to prevent the electrode current collector 400 and the counter electrode current collector 500 from coming into contact with each other and causing a short circuit around (for example, on all four sides of) the laminate of the second region 320, the electrode layer 100, and the counter electrode layer 200.

[0320] The third region 330 may be disposed in the entire region where the electrode current collector 400 and the counter electrode current collector 500 face each other, without the electrode layer 100 and the counter electrode layer 200 in between. This further prevents the electrode current collector 400 and the counter electrode current collector 500 from coming into contact with each other and causing a short circuit around (for example, on all four sides of) the stack of the second region 320, the electrode layer 100, and the counter electrode layer 200.

[0321] FIG. 30 is a diagram showing a schematic configuration of a battery 7100 according to the seventh embodiment.

[0322] FIG. 30 is an xz view (cross-sectional view taken along line 30A) showing a schematic configuration of a battery 7100 according to the seventh embodiment.

[0323] FIG. 30 is an xy diagram (top perspective view) showing a schematic configuration of a battery 7100 according to the seventh embodiment.

[0324] As shown in FIG. 30, the second distance D2 may be smaller than the first distance D1.

[0325] In this case, the third distance D3 may be smaller than the second distance D2.

[0326] Here, the first distance D1 is the distance between the electrode current collector 400 and the counter electrode current collector 500 at the position where the first region 310 is disposed.

[0327] The second distance D2 is the distance between the electrode current collector 400 and the counter electrode current collector 500 at the position where the second region 320 is disposed.

[0328] The third distance D3 is the distance between the electrode current collector 400 and the counter electrode current collector 500 at the position where the third region 330 is disposed.

[0329] According to the above configuration, it is possible to configure a battery (i.e., a battery with a narrowed outer peripheral side surface) in which the outer peripheral portion of the solid electrolyte layer 300 (in other words, the outer peripheral portion between the electrode current collector 400 and the counter electrode current collector 500) is narrowed. This makes it possible to reduce the exposed area of the outer peripheral portion of the solid electrolyte layer 300. Therefore, for example, the second region 320 and the third region 330 can more reliably block the passage of outside air (e.g., air, moisture, etc.) to the first region 310. Furthermore, the durability (for example, impact resistance) of the outer peripheral side surface of the battery can be further improved, thereby further improving the environmental resistance of the battery.

[0330] In the first to seventh embodiments, a part (or all) of the side surface of the battery may be covered with an insulating material (e.g., a sealant). This allows the battery to be sealed more firmly. In this case, the sealant may be, for example, a moisture-proof laminate sheet. This allows the sealant to prevent the battery from deteriorating due to moisture. The battery may also be enclosed in a sealed case. As the sealed case, a commonly known battery case (e.g., a laminated bag, a metal can, a resin case, etc.) may be used.

[0331] The batteries in the first to seventh embodiments may further include a pair of external electrodes. When the entire battery is sealed with a sealing material, the pair of external electrodes may protrude outward from the top and bottom surfaces (or side surfaces) of the battery. One of the external electrodes may be connected, for example, to a current collector (e.g., electrode current collector 400) located at one end of the battery. In this case, the other external electrode may be connected, for example, to a current collector (e.g., counter electrode current collector 500) located at the other end of the battery. This enables the battery to be discharged to a load connected to the pair of external electrodes and to be charged by a charging device connected to the pair of external electrodes.

[0332] The configurations described in each of the above-mentioned first to seventh embodiments may be combined with each other as appropriate.

[0333] [Battery manufacturing method] An example of a method for manufacturing the batteries according to the first to seventh embodiments will be described below.

[0334] First, pastes to be used for printing the first region 310, the second region 320, the positive electrode layer, and the negative electrode layer are prepared. The pastes for the first region 310 and the second region 320 may be made from the same solid electrolyte material, or may be made from different solid electrolyte materials. A glass powder of Li2S-P2S5-based sulfide with an average particle size of approximately 10 μm and mainly composed of triclinic crystals is prepared as the solid electrolyte raw material used for the composite components of the first region 310, the second region 320, the positive electrode layer, and the negative electrode layer. This compact has high ionic conductivity (for example, 2 to 3 × 10 -3 A solid electrolyte paste is prepared by adding an organic binder and a solvent to the glass powder described above, mixing and dispersing the glass powder to form the first region 310 and the second region 320. The positive electrode active material is a layered Li·Ni·Co·Al composite oxide (LiNi 0.8 Co 0.15 Al 0.05 A powder of natural graphite (O2) is used. A positive electrode layer paste made of a mixture containing this active material and the above-mentioned glass powder is similarly prepared. Furthermore, a powder of natural graphite having an average particle size of approximately 10 μm is used as the negative electrode active material. A negative electrode layer paste made of a mixture containing this active material and the above-mentioned glass powder is similarly prepared.

[0335] Next, copper foils with a thickness of approximately 30 μm are prepared to be used as positive and negative electrode current collectors. Using a screen printing method, a paste for the positive electrode layer and a paste for the negative electrode layer are printed onto one surface of each copper foil in a predetermined shape with a thickness of approximately 50 to 100 μm. These are dried at 80 to 130°C to a thickness of 30 to 60 μm. This results in current collectors (copper foils) on which a printed body that will become the positive electrode layer and a printed body that will become the negative electrode layer are formed.

[0336] Next, the solid electrolyte paste described above is printed to a thickness of about 100 μm using a metal mask on the surfaces of the current collectors on which the printed bodies to become the positive electrode layer and the negative electrode layer are formed, and then these are dried at 80 to 130°C.

[0337] Next, the solid electrolyte layer on the positive electrode side and the solid electrolyte layer on the negative electrode side are stacked so as to face each other, and then placed in a rectangular die mold. Next, the solid electrolyte layer is pressed between a pressure die punch and a die having an elastic modulus of 5×10 6 An elastic sheet (70 μm thick) with a pressure of about 300 MPa is inserted. This is then pressed for 90 seconds while being heated to 50° C., to obtain a laminate.

[0338] The solid electrolyte material, positive electrode active material, and negative electrode active material may be materials whose Young's modulus (modulus of longitudinal elasticity) relationship satisfies the following relationship: "solid electrolyte material (20 GPa) < positive electrode active material and negative electrode active material (150 GPa)." The Young's modulus of a typical sulfide-based solid electrolyte is 10 to 30 GPa. Metals and oxides have a Young's modulus of 100 to 300 GPa.

[0339] Furthermore, the dried films of pastes for the solid electrolyte layer, positive electrode layer, and negative electrode layer can be made to satisfy the following relationship of compressibility before and after pressure application during lamination: solid electrolyte (approximately 30%) > positive electrode active material and negative electrode active material (approximately 10%). The compressibility characteristics of the printed paste can be controlled by the manufacturing process (e.g., binder or solvent design, drying method, etc.). Since sulfide-based solid electrolytes have a high Young's modulus, they are also subject to pressure deformation, so using sulfide-based solid electrolytes can easily increase the compressibility.

[0340] By using raw materials that satisfy the above-mentioned relationship between elasticity and compression properties and pressing them together using the above-mentioned method, a laminate that satisfies the relationship "second density (relative density 90%) > first density (relative density 82%)" can be obtained. Here, relative density means the ratio to the theoretical density. In the case of the sulfide-based glass powder mentioned above, the density (theoretical value) calculated from the unit lattice of the crystal structure is 2.0 g / cm. 3 In contrast, the density and conductivity of the first region 310 are 1.64 g / cm 3 When -3 The density and conductivity of the second region 320 were 1.8 g / cm 3 When -3 The density inside the battery can be confirmed by cross-sectional observation using, for example, an SEM. The conductivity can be evaluated using a micro-characteristics evaluation device such as a microprober.

[0341] Note that a test sample with the same relative density can be prepared and its electrical conductivity evaluated. The first region 310 is the operating portion of the battery. That is, the first region 310 is the operating region where ions are exchanged and current flows during charging and discharging of the battery. Therefore, a higher electrical conductivity in the first region 310 is desirable. On the other hand, the second region 320 (and the third region 330) are regions that are relatively less involved in ion exchange. Therefore, the relationship "electrical conductivity of the first region 310 < electric conductivity of the second region 320" may be satisfied. In this case, the effective thermal conductivity changes in response to the density or electrical conductivity due to an increase in the effective area and an increase in conductive carriers, which also serve as heat conduction carriers. Therefore, the relationship between density and electrical conductivity is reflected in the thermal conductivity. Therefore, when the relationship "electrical conductivity of the first region 310 < electric conductivity of the second region 320" is satisfied, the same relative relationship is also satisfied for the thermal conductivity. Furthermore, effective electrical conductivity and thermal conductivity improve in response to increased density (and, in general, strength also increases). In particular, sulfide-based solid electrolytes have a higher elastic modulus and pressure sinterability than common inorganic materials. Therefore, even from a compacted powder, by increasing the packing ratio (i.e., density) through pressure or heating, it is possible to improve the density, electrical conductivity, and strength over a wide range.

[0342] When forming the first region 310 from a powder compact, the relative density may be controlled to be equal to or higher than the percolation threshold at which the electrical conductivity increases sharply. That is, the first density may be equal to or higher than the percolation threshold. This allows an appropriate level of electrical conductivity to be obtained depending on the powder. Above the percolation threshold, the electrical conductivity increases gradually with increasing density. Therefore, the relationship between the operation of the battery and the density of the solid electrolyte layer 300 can be easily understood. To achieve both of these properties, a relative density above the percolation threshold is appropriate. In the case of the sulfide-based glass powder described above, the percolation threshold determined from the pressure dependence of density and conductivity was at a relative density of approximately 70%. Meanwhile, the first region 310 and the second region 320 were formed with relative densities of 82% and 90%, respectively.

[0343] When the compact of the positive electrode layer, negative electrode layer, and solid electrolyte layer is compressed, the compressibility of the solid electrolyte layer may be greater than that of the positive electrode layer and negative electrode layer. As can be seen from the Young's modulus and compression characteristics described above, the positive electrode layer and negative electrode layer are hard and difficult to compress. In contrast, the second region 320 is soft and easily compressed. Therefore, when the elastic body inserted between the mold and the laminate deforms and compresses due to pressure, the second region 320 is selectively compressed compared to the positive electrode layer or negative electrode layer. In contrast, the first region 310, because the positive electrode layer and negative electrode layer are located above and below the pressure application axis, absorbs and loses pressure. Therefore, attenuated pressure is transmitted to the second region 320. Therefore, the second region 320 necessarily has a lower density than the first region 310. In this way, the density relationship "second density > first density" is satisfied.

[0344] In the above-described manufacturing method, the difference between the first density and the second density can be increased by increasing the difference in the relationship between the Young's modulus or the compressibility of the constituent materials, or by softening (or thickening) the hardness of the elastic sheet, etc. In this case, a configuration can be achieved in which the thickness of the second region 320 is thinner than the thickness of the first region 310.

[0345] By shifting the formation ranges of the positive electrode layer and the negative electrode layer, three regions with different compression characteristics can be formed in the pressure axis direction. This allows the above-mentioned manufacturing method to produce a battery having the third region 330.

[0346] The density relationship between the regions in the solid electrolyte layer can be realized not only by the example of the manufacturing method described above, but also by the manufacturing method described below.

[0347] That is, a paste having a higher density of solid electrolyte material (e.g., a paste having a higher solid content ratio) than that of the first region 310 may be prepared as the paste for forming the second region 320 (or the third region 330). In this case, the density of each paste can be adjusted by adjusting the amount of solid electrolyte material and other ingredients (e.g., binder, etc.) contained in the paste. These pastes with different densities may be printed on the surface of a current collector. Then, a laminate (battery) may be fabricated by pressing using a general parallel-plate rigid body.

[0348] Alternatively, a method may be used in which, after printing and drying each paste, the second region 320 (or the third region 330) is selectively pressed stronger than the first region 310. For example, a lamination press method using a concave-convex mold may be used.

[0349] Alternatively, after applying a high-density green sheet for the second region 320 (or the third region 330), a portion that will become the first region 310 may be punched out by a punching process. After that, a method may be used in which a paste that will form the first region 310 is filled (or printed) into the recess that is formed as a result.

[0350] In the above manufacturing method, by adjusting the formation positions of first region 310, second region 320, and third region 330, each of the batteries shown in the above-mentioned first to seventh embodiments can be manufactured. [Industrial Applicability]

[0351] The battery of the present disclosure can be used, for example, as a battery (for example, an all-solid-state secondary battery) used in various electronic devices or automobiles. [Explanation of symbols]

[0352] 100 electrode layers 200 Polar Layer 300 solid electrolyte layer 310 1st area 311 1st overhang part 320 Second area 321 2nd overhang part 330 Third area 400 Electrode current collector 500 Counter electrode current collector 1000,1100,1200,2000,2100,2200,3000,3100,3200,3300,3400,3500,4000,4100,4200 ,4300,5000,5100,5200,5300,6000,6100,6200,6300,6400,6500,6600,6700,7000,7100 battery

Claims

1. an electrode layer; a counter electrode layer that is a counter electrode of the electrode layer; a solid electrolyte layer located between the electrode layer and the counter electrode layer; Equipped with the solid electrolyte layer has a first region containing a first solid electrolyte material and a second region containing a second solid electrolyte material; the first region is located in a region where the electrode layer and the counter electrode layer face each other, the second region is located closer to the outer periphery of the region where the electrode layer and the counter electrode layer face each other than the first region, and is in contact with the first region; a density of the first solid electrolyte material in the first region is defined as a first density; When the density of the second solid electrolyte material in the second region is a second density, the second density is higher than the first density; a width of the first region in a direction perpendicular to a main surface of the electrode layer is smaller than a width of the second region; battery.

2. a sum of a width of the first region and a width of the electrode layer in the direction perpendicular to the main surface of the electrode layer is smaller than a width of the second region; The battery of claim 1 .

3. further comprising an electrode current collector electrically connected to the electrode layer; a sum of a width of the first region, a width of the electrode layer, and a width of the electrode current collector in the direction perpendicular to the main surface of the electrode layer is smaller than a width of the second region; The battery of claim 1 .

4. The second region is located around the electrode layer. The battery of claim 1 .

5. The second region is located in contact with a side surface of the counter electrode layer. The battery of claim 1 .

6. The second region is located around the counter electrode layer. The battery of claim 1 .

7. The first solid electrolyte material is the same material as the second solid electrolyte material. The battery of claim 1 .

8. a formation area of the counter electrode layer is larger than a formation area of the electrode layer, the electrode layer is located within a range in which the counter electrode layer is formed, The second region is located in contact with a side surface of the electrode layer. The battery of claim 1 .

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