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 a battery.

Background Art

[0002] Patent Document 1 discloses an electric 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 Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the prior art, a battery with excellent heat dissipation is desired.

Means for Solving the Problems

[0006] A battery according to an aspect 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 positioned between the electrode layer and the counter electrode layer. 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 within a region where the electrode layer and the counter electrode layer face each other, and the second region is located on an outer peripheral side of the region where the electrode layer and the counter electrode layer face each other, in contact with the first region, relative to the first region. When the density of the first solid electrolyte material in the first region is defined as a first density and the density of the second solid electrolyte material in the second region is defined as a second density, the second density is higher than the first density.

Advantages of the Invention

[0007] According to the present disclosure, a battery with excellent heat dissipation can be realized.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Figure 19

Figure 20

Figure 21

Figure 22

Figure 23

Figure 24

Figure 25

Figure 26

Figure 27

Figure 28

Figure 29

Figure 30

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

[0010] All the embodiments described below show a specific example. The numerical values, shapes, materials, components, arrangement positions of components, connection forms, etc. shown in the following embodiments are just examples and are not intended to limit the present invention. Also, among the components in the following embodiments, the components not described in the independent claims indicating the top-level concept are described as optional components.

[0011] (Embodiment 1) FIG. 1 is a diagram showing a schematic configuration of a battery 1000 in Embodiment 1.

[0012] FIG. 1(a) is an x-z diagram (1A sectional view) showing a schematic configuration of the battery 1000 in Embodiment 1. view).

[0013] FIG. 1(b) is an x-y diagram (top perspective view) showing a schematic configuration of the battery 1000 in Embodiment 1.

[0014] The battery 1000 in Embodiment 1 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 the counter electrode of 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 within the 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 on the outer peripheral side of the region where the electrode layer 100 and the counter electrode layer 200 face each other, rather than the first region 310. Further, the second region 320 is in contact with the first region 310 and is located.

[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] Also, 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, according to the above configuration, the density of the solid electrolyte material at the outer edge portion of the solid electrolyte layer 300 can be increased. As a result, the thermal conductivity of the outer edge 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 a portion likely to become high temperature during battery operation, is easily propagated (diffused) to the outer edge portion of the solid electrolyte layer 300. Also, since both the first region 310 and the second region 320 are regions containing a solid electrolyte material (i.e., a metal ion conductive material), the interface matching and adhesion at the contact portion between the first region 310 and the second region 320 can be improved. That is, through the bonding interface between the first region 310 and the second region 320, heat transport from the first region 310 to the second region 320 can be realized by bridging the heat generation component along with the conduction of metal ions by the solid electrolyte material. As a result, heat generated in the central portion of the battery (e.g., heat generated in the first region 310 or 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 the outside of the battery) through the outer edge portion of the solid electrolyte layer 300 (i.e., the second region 320) where the solid electrolyte material density is higher (i.e., the thermal conductivity is higher). Thereby, the temperature non-uniformity (temperature variation) in the solid electrolyte layer 300 containing a non-fluid solid electrolyte material (e.g., an inorganic solid electrolyte) can be reduced. Therefore, for example, even when the battery has a large area, the temperature homogeneity inside the battery can be maintained. As a result, it is possible to suppress variations in the characteristics inside the battery depending on the location. As a result, deterioration of battery performance can be suppressed. Therefore, for example, the battery life can be extended.

[0027] Moreover, according to the above configuration, since the solid electrolyte layer 300 positioned between the electrode layer 100 and the counter electrode layer 200 has the above-described heat dissipation function, the heat generated from both the electrode layer 100 and the counter electrode layer 200 can be propagated to the outer edge portion of the battery by the solid electrolyte layer 300 which is one battery member. Further, since the solid electrolyte layer 300 is a member positioned at the central portion inside the battery (i.e., between the electrode layer 100 and the counter electrode layer 200), compared with a configuration in which a heat dissipation member is provided only on the electrode layer 100 side (or only on the counter electrode layer 200 side), the heat generated at the central portion of the battery can be more easily propagated to the outer edge portion of the battery.

[0028] Moreover, according to the above configuration, by increasing the solid electrolyte material density of the second region 320, the strength of the second region 320 can be increased. Thereby, at least a part of the outer edge of the first region 310 can be covered by the second region 320 having higher strength. For this reason, breakage of the first region 310 having relatively low strength (for example, collapse of the first solid electrolyte material, etc.) can be suppressed by the second region 320. Therefore, the strength of the battery can be improved.

[0029] Moreover, according to the above configuration, the second region 320 having a higher solid electrolyte material density can be interposed between the first region 310 and the outside of the battery (for example, outside air). Thereby, for example, ventilation of outside air (for example, air, moisture, etc.) to the first region 310 can be blocked by the second region 320. For this reason, the environmental resistance of the battery can be improved.

[0030] Note that the electrode layer 100 may contain an electrode active material.

[0031] Moreover, the counter electrode layer 200 may contain a counter electrode active material.

[0032] At this time, both the density of the electrode active material in the first region 310 (for example, if the electrode active material is in particle form, the packing density of the particles of the electrode active material) and the density of the counter electrode active material (for example, if the counter electrode active material is in particle form, the packing density of the particles of the counter electrode active material) may be lower than the first density.

[0033] Further, 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 densities of the electrode active material and the counter electrode active material are low (that is, a portion located more centrally in the solid electrolyte layer 300, away from both the electrode layer 100 and the counter electrode layer 200). That is, the first region 310 and the second region 320 having high heat dissipation properties can be arranged in a more central portion inside the battery. As a result, compared with a configuration in which a heat dissipation member is provided only at a position closer to the electrode layer 100 side (or only at a position closer to the counter electrode layer 200 side), heat generated in the central portion of the battery can be more easily propagated to the outer edge portion of the battery.

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

[0036] According to the above configuration, the first region 310 and the second region 320 can be arranged in a portion that does not contain the electrode active material and the counter electrode active material (that is, a portion located more centrally in the solid electrolyte layer 300, away from both the electrode layer 100 and the counter electrode layer 200). That is, the first region 310 and the second region 320 having high heat dissipation properties can be arranged in a more central portion inside the battery. As a result, compared with a configuration in which a heat dissipation member is provided only at a position closer to the electrode layer 100 side (or only at a position closer to the counter electrode layer 200 side), heat generated in the central portion of the battery can be more easily propagated to the outer edge portion of the battery.

[0037] Note that the formation range of the electrode layer 100 may be the same size as or different from the formation range of the counter electrode layer 200. That is, the shapes of the electrode layer 100 and the counter electrode layer 200 may be the same or different.

[0038] Note that 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 mainly be a layer 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 releasing and inserting metal ions (for example, Li ions, Mg ions, etc.) can be used. As the material of 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 O2, (where M is at least one element of Co, Al, Mn, V, Cr, Mg, Ca, Ti, Zr, Nb, Mo, W, and x is an arbitrary natural number)), lithium cobalt oxide (LiCoO2), lithium nickel oxide (LiNiO2), layered oxides such as lithium manganate (LiMn2O4), lithium iron phosphate (LiFePO4) having an olivine structure, and transition metal oxides containing lithium ions such as lithium manganate (LiMn2O4, Li2MnO3, LiMO2) having a spinel structure are used. In addition, sulfides such as sulfur (S) and lithium sulfide (Li2S) can also be used. Further, a material obtained by coating (or adding) lithium niobate (LiNbO3) or the like to the positive electrode active material particles can be used as the positive electrode active material.

[0041] Note that the positive electrode layer may be a composite layer composed of a composite of a positive electrode active material and other additive materials. As the additive material of the positive electrode layer, a solid electrolyte (for example, an inorganic solid electrolyte, etc.), a conductive auxiliary material (for example, acetylene black, etc.), a binder for binding (for example, polyethylene oxide, polyvinylidene fluoride, etc.), etc. can be used. By mixing a solid electrolyte or the like in a positive electrode layer at a predetermined ratio, the ionic conductivity of the positive electrode layer can be improved.

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

[0043] The negative electrode layer may mainly be a layer 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 releasing and inserting metal ions (for example, Li ions, Mg ions, etc.) can be used. As the material of 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-fired carbon, etc.), alloy-based materials combined with a solid electrolyte, 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 ), metal (such as Zn) oxides, etc., can be used.

[0044] Incidentally, the negative electrode layer may be a composite layer composed of a composite of a negative electrode active material and other additive materials. As the additive material of the negative electrode layer, a solid electrolyte (for example, an inorganic solid electrolyte, etc.), a conductive auxiliary material (for example, acetylene black, etc.), a binder for binding (for example, polyethylene oxide, polyvinylidene fluoride, etc.), etc., can be used. By mixing a solid electrolyte, etc. in the negative electrode layer at a predetermined ratio, the ionic conductivity of the negative electrode layer can be improved. Incidentally, the thickness of the negative electrode layer is, for example, 5 to 300 μm.

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

[0046] In addition, as the first solid electrolyte material and the second solid electrolyte material, generally known solid electrolytes for batteries (solid electrolytes that conduct metal ions (e.g., Li ions, Mg ions, etc.)) can be used. As the solid electrolyte, generally known solid electrolytes (e.g., inorganic solid electrolytes, etc.) can be used. As the inorganic solid electrolyte, sulfide solid electrolytes, oxide solid electrolytes, etc. can be used. As the solid electrolyte, for example, lithium-containing sulfides (e.g., Li2S-P2S5 system, Li2S-SiS2 system, Li2S-B2S3 system, Li2S-GeS2 system, Li2S-SiS2-LiI system, Li2S-SiS2-Li3PO4 system, Li2S-Ge2S2 system, Li2S-GeS2-P2S5 system, Li2S-GeS2-ZnS system, etc.) can be used. Or, as the solid electrolyte, for example, lithium-containing metal oxides (e.g., Li2-SiO2, Li2-SiO2-P2O5, etc.), lithium-containing metal nitrides (e.g., Li x P y O 1-z N2 (where x, y, and z are arbitrary natural numbers), etc.), lithium phosphate (Li3PO4), lithium-containing transition metal oxides (e.g., lithium titanate, etc.), etc. can be used. As the solid electrolyte, only one of these materials may be used, or two or more of these materials may be combined and used.

[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 binder for binding (e.g., polyethylene oxide, polyvinylidene fluoride, etc.), etc.

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

[0049] Note that the first solid electrolyte material and the second solid electrolyte material may be different from each other. Thereby, for example, while using a solid electrolyte material with high heat dissipation as the second solid electrolyte material, a solid electrolyte material with high conductivity of metal ions can be used as the first solid electrolyte material.

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

[0051] According to the above configuration, the same solid electrolyte material can be included in the first region 310 and the second region 320. Thereby, the physical property values (for example, thermal expansion coefficient, etc.) of the first region 310 and the second region 320 can be made closer to each other. For this reason, the interface matching and adhesion at the contact portion between the first region 310 and the second region 320 can be further improved. That is, the generation of structural defects that inhibit heat transport between the first region 310 and the second region 320 can be further suppressed. Thereby, the heat generated in the central portion of the battery (for example, the heat generated in the first region 310 or 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 the outside of the battery) through the second region 320. Further, for example, when the material compositions of the first region 310 and the second region 320 are the same, the manufacturing process of the battery (for example, mixing of the mixture, coating of the mixture, etc.) can be made simpler.

[0052] Note that the first solid electrolyte material may be configured as particles. At this time, the first region 310 is a region containing the particles of the first solid electrolyte material. At this time, the first density is the density (that is, the packing density) of the particles of the first solid electrolyte material in the first region 3 10.

[0053] Note that the second solid electrolyte material may be configured as particles. At this time, the second region 320 is a region containing the particles of the second solid electrolyte material. At this time, the second density is the density (that is, the packing density) of the particles of the second solid electrolyte material in the second region 320.

[0054] Note that 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] Note that, as shown in FIG. 1, the second region 320 may be located only within 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 in Embodiment 1.

[0057] FIG. 2(a) is an x-z diagram (2A cross-sectional view) showing a schematic configuration of the battery 1100 in Embodiment 1.

[0058] FIG. 2(b) is an x-y diagram (top perspective view) showing a schematic configuration of the battery 1100 in Embodiment 1.

[0059] As shown in FIG. 2, the second region 320 may be located in both the region where the electrode layer 100 and the counter electrode layer 200 face each other and the region outside where the electrode layer 100 and the counter electrode layer 200 face each other. Thereby, the second region 320 can be arranged further away from the center of the battery. Therefore, the heat dissipation performance by the second region 320 can be further enhanced.

[0060] Note that 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 FIG. 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 in Embodiment 1.

[0062] FIG. 3(a) is an x-z diagram (3A cross-sectional view) showing a schematic configuration of the battery 1200 in Embodiment 1.

[0063] FIG. 3(b) is an x-y diagram (top perspective view) showing the schematic configuration of the battery 1200 in Embodiment 1.

[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. Thereby, the second region 320 can be arranged further away from the center of the battery. Therefore, the heat dissipation performance of the second region 320 can be further enhanced. Further, 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 responsible for the propagation of metal ions between the electrode layer 100 and the counter electrode layer 200 can be arranged with a larger area.

[0065] As described above, in the present disclosure, "the second region 320 is located on the outer peripheral side of the region where the electrode layer 100 and the counter electrode layer 200 face each other rather than the first region 310" includes the configurations shown in FIGS. 1 to 3 above (that is, 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" means, for example, when viewed from the stacking direction of the electrode layer 100 and the counter electrode layer 200 (that is, the z direction in the figure), a region where a part (or the entire region) of the main surface of the electrode layer 100 overlaps with a part (or the entire region) of the main surface of the counter electrode layer 200 (that is, the overlapping region).

[0067] In the present disclosure, the "configuration where the electrode layer 100 and the counter electrode layer 200 face each other" means, for example, a configuration in which another member (for example, a solid electrolyte layer 300, etc.) is arranged between the main surface of the electrode layer 100 and the main surface of the counter electrode layer 200 facing each other.

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

[0069] Alternatively, the second region 320 may be disposed at two or more of the ends of the solid electrolyte layer 300. For example, if the solid electrolyte layer 300 has a rectangular shape (e.g., a quadrilateral shape) as shown in FIGS. 1 to 3, the second region 320 may be disposed on two or more sides of the shape. Thereby, heat dissipation (as well as strength, environmental resistance, etc.) can be enhanced at two or more ends.

[0070] (Embodiment 2) Hereinafter, Embodiment 2 will be described. Descriptions overlapping with those of the above-described Embodiment 1 will be omitted as appropriate.

[0071] FIG. 4 is a diagram showing a schematic configuration of the battery 2000 in Embodiment 2.

[0072] FIG. 4(a) is an x-z diagram (cross-sectional view of 4A) showing a schematic configuration of the battery 2000 in Embodiment 2.

[0073] FIG. 4(b) is an x-y diagram (top perspective view) showing a schematic configuration of the battery 2000 in Embodiment 2.

[0074] The battery 2000 in Embodiment 2 further includes the following configuration in addition to the configuration of the battery 1000 in the above-described Embodiment 1.

[0075] That is, in the battery 2000 in Embodiment 2, the second region 320 is located surrounding the first region 310.

[0076] According to the above configuration, the density of the solid electrolyte material at the four outer edge portions (for example, all of the outer edge portions) of the solid electrolyte layer 300 can be increased. As a result, heat from the central portion of the solid electrolyte layer 300 is more likely to be propagated (diffused) to the outer edge portions of the solid electrolyte layer 300 close to their respective heat generating portions. Thereby, heat generated in the central portion of the battery (for example, heat generated in the first region 310 or 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).

[0077] Also, according to the above configuration, the second region 320 with higher strength can cover the four outer edges (for example, all of the outer edges) of the first region 310. For this reason, breakage of the four outer edges of the first region 310 with relatively low strength (for example, collapse of the first solid electrolyte material, etc.) can be more suppressed by the second region 320. Therefore, the strength of the battery can be further improved. can be achieved.

[0078] Also, according to the above configuration, the second region 320 with 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 (for example, the outside air). Thereby, for example, ventilation of outside air (for example, air, moisture, etc.) to the four outer edges of the first region 310 can be blocked by the second region 320. For this reason, the environmental resistance of the battery can be further improved.

[0079] Note that, as shown in FIG. 4, the second region 320 may be located only within 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 the battery 2100 in Embodiment 2.

[0081] FIG. 5(a) is an x - z diagram (5A cross - sectional view) showing a schematic configuration of the battery 2100 in Embodiment 2.

[0082] FIG. 5(b) is an x-y diagram (top perspective view) showing the schematic configuration of the battery 2100 in Embodiment 2.

[0083] As shown in FIG. 5, the second region 320 may be located in both the region where the electrode layer 100 and the counter electrode layer 200 face each other and the region outside the region where the electrode layer 100 and the counter electrode layer 200 face each other. Thereby, the second region 320 can be arranged on all four sides of the battery and further away from the center of the battery. Therefore, the heat dissipation performance of the second region 320 can be further enhanced.

[0084] Note that the second region 320 may be a region that is 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 FIG. 5, the second region 320 may be a region that is in contact with both the electrode layer 100 and the counter electrode layer 200.

[0085] FIG. 6 is a diagram showing the schematic configuration of the battery 2200 in Embodiment 2.

[0086] FIG. 6(a) is an x-z diagram (cross-sectional view of 6A) showing the schematic configuration of the battery 2200 in Embodiment 2.

[0087] FIG. 6(b) is an x-y diagram (top perspective view) showing the schematic configuration of the battery 2200 in Embodiment 2.

[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. Thereby, the second region 320 can be arranged further away from the center of the battery. Therefore, the heat dissipation performance of the second region 320 can be further enhanced. 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 responsible for the propagation of metal ions between the electrode layer 100 and the counter electrode layer 200 can be arranged with a larger area.

[0089] As described above, in the present disclosure, "the second region 320 is positioned surrounding the first region 310" includes the configurations shown in FIGS. 4 to 6 above (i.e., the arrangement configuration of the second region 320). That is, "the second region 320 is positioned surrounding the first region 310" includes, for example, the meaning of "the second region 320 is arranged in contact with all ends of the first region 310". That is, for example, if the first region 310 has a rectangular shape (e.g., a quadrilateral shape) as shown in FIGS. 4 to 6, the second region 320 may be arranged in contact with all sides of the shape. For example, the outer peripheral side surface of the first region 310 may be joined to the inner peripheral side surface of the second region 32 0.

[0090] (Embodiment 3) Hereinafter, Embodiment 3 will be described. Descriptions overlapping with those of the above-described Embodiment 1 or 2 will be omitted as appropriate.

[0091] FIG. 7 is a diagram showing a schematic configuration of the battery 3000 in Embodiment 3.

[0092] FIG. 7(a) is an x - z diagram (7A cross-sectional view) showing a schematic configuration of the battery 3000 in Embodiment 3.

[0093] FIG. 7(b) is an x - y diagram (top perspective view) showing a schematic configuration of the battery 3000 in Embodiment 3.

[0094] The battery 3000 in Embodiment 3 further includes the following configuration in addition to the configuration of the battery 1000 in the above-described Embodiment 1.

[0095] That is, in the battery 3000 in Embodiment 3, the second region 320 is positioned in contact with an end portion (e.g., a side surface) of the electrode layer 100.

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

[0097] Also, according to the above configuration, the outer edge portion (for example, at least one end portion) of the electrode layer 100 can be covered by the second region 320 having higher strength. Therefore, breakage of the outer edge portion of the electrode layer 100 having relatively low strength (for example, detachment of the electrode material, etc.) can be more effectively suppressed by the second region 320. Thus, the strength of the battery can be further improved.

[0098] Also, according to the above configuration, the second region 320 having 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). Thereby, for example, ventilation of outside air (for example, air, moisture, etc.) to the outer edge portion of the electrode layer 100 can be blocked by the second region 320. Therefore, the environmental resistance of the battery can be further improved.

[0099] Note that, as shown in FIG. 7, the second region 320 may be disposed in contact with only one end portion of the electrode layer 100. For example, if the electrode layer 100 has a rectangular shape (for example, a quadrangular 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 end portions of the electrode layer 100. For example, if the electrode layer 100 has a rectangular shape (for example, a quadrangular shape) as shown in FIG. 7, the second region 320 may be disposed in contact with two or more sides of the shape. Thereby, heat dissipation (and strength, environmental resistance, etc.) can be enhanced at two or more end portions.

[0101] FIG. 8 is a diagram showing a schematic configuration of the battery 3100 in Embodiment 3.

[0102] FIG. 8(a) is an x-z diagram (8A cross-sectional view) showing a schematic configuration of the battery 3100 in Embodiment 3.

[0103] FIG. 8(b) is an x-y diagram (top perspective view) showing a schematic configuration of the battery 3100 in Embodiment 3.

[0104] As shown in FIG. 8, the second region 320 may be positioned surrounding the electrode layer 100.

[0105] According to the above configuration, the second region 320 with a high density of the solid electrolyte material can be arranged in contact with the outer edge portions (for example, all of the outer edge portions) on the four sides of the electrode layer 100. Thereby, heat from the electrode layer 100 is easily propagated (diffused) to the second region 320 close to each heat generation portion. As a result, heat generated in the central portion of the battery (that is, heat generated in the electrode layer 100) can be more easily dissipated to the surface of the solid electrolyte layer 300 (and the outside of the battery).

[0106] Also, according to the above configuration, the second region 320 with higher strength can cover the outer edge portions (for example, all of the outer edges) on the four sides of the electrode layer 100. Therefore, damage to the outer edge portions on the four sides of the electrode layer 100 with relatively low strength (for example, the collapse of the electrode material, etc.) can be more suppressed by the second region 320. Thus, the strength of the battery can be further improved.

[0107] Also, according to the above configuration, the second region 320 with a higher density of the solid electrolyte material can be interposed between the outer edge portions on the four sides of the electrode layer 100 and the outside of the battery (for example, the outside air). Thereby, for example, ventilation of the outside air (for example, air, moisture, etc.) to the outer edge portions on the four sides of the electrode layer 100 can be blocked by the second region 320. Therefore, the environmental resistance of the battery can be further improved.

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

[0109] FIG. 9(a) is an xz diagram (9A cross-sectional view) showing a schematic configuration of a battery 3200 in the third embodiment.

[0110] FIG. 9(b) is an xy diagram (top see-through view) showing a schematic configuration of a battery 3200 in the third embodiment.

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

[0112] That is, in the battery 3200 in the third embodiment, the second region 320 is located in contact with an end portion (for example, a 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 (e.g., 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 propagated (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] In addition, according to the above configuration, the second region 320 having a higher strength can be used to form the counter electrode layer 200. 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] Further, according to the above configuration, a second region 320 with 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 (for example, the outside air). Thereby, for example, the ventilation of the outside air (for example, air, moisture, etc.) to the outer edge portion of the counter electrode layer 200 can be blocked by the second region 320. Therefore, the environmental resistance of the battery can be further improved.

[0116] In addition, as shown in FIG. 9, the second region 320 may be disposed in contact with only one end portion of the counter electrode layer 200. For example, if the counter electrode layer 200 has a rectangular shape (for example, a quadrangular 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 end portions of the counter electrode layer 200. For example, if the counter electrode layer 200 has a rectangular shape (for example, a quadrangular shape) as shown in FIG. 9, the second region 320 may be disposed in contact with two or more sides of the shape. Thereby, the heat dissipation (and strength, environmental resistance, etc.) can be enhanced at two or more end portions.

[0118] FIG. 10 is a diagram showing a schematic configuration of a battery 3300 in Embodiment 3.

[0119] FIG. 10(a) is an x - z diagram (cross - sectional view of 10A) showing a schematic configuration of the battery 3300 in Embodiment 3.

[0120] FIG. 10(b) is an x - y diagram (top perspective view) showing a schematic configuration of the battery 3300 in Embodiment 3.

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

[0122] According to the above configuration, a second region 320 with a high density of solid electrolyte material can be arranged in contact with the outer edge portions (for example, all of the outer edge portions) on the four sides of the counter electrode layer 200. As a result, heat from the counter electrode layer 200 is more likely to be propagated (diffused) to the second region 320 close to each heat generating portion. Thereby, heat generated in the central portion of the battery (that is, heat generated in the counter electrode layer 200) can be more easily dissipated to the surface of the solid electrolyte layer 300 (and the outside of the battery).

[0123] Also, according to the above configuration, the second region 320 with higher strength can cover the outer edge portions (for example, all of the outer edges) on the four sides of the counter electrode layer 200. Therefore, damage to the outer edge portions on the four sides of the counter electrode layer 200 with relatively low strength (for example, the collapse of the counter electrode material, etc.) can be more suppressed by the second region 320. Thus, the strength of the battery can be further improved.

[0124] Also, according to the above configuration, a second region 320 with a higher density of solid electrolyte material can be interposed between the outer edge portions on the four sides of the counter electrode layer 200 and the outside of the battery (for example, the outside air). Thereby, for example, ventilation of outside air (for example, air, moisture, etc.) to the outer edge portions on the four sides of the counter electrode layer 200 can be blocked by the second region 320. Therefore, the environmental resistance of the battery can be further improved. The environmental resistance can be further improved.

[0125] In the present disclosure, "the second region 320 is located surrounding the electrode layer 100 (or the counter electrode layer 200)" includes, for example, the meaning of "the second region 320 is arranged in contact with all of the ends 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 (for example, a square shape), the second region 320 may be arranged in contact with all sides of the shape.

[0126] Note that, as shown in FIGS. 7 to 10, the second region 320 may be located within the region where the electrode layer 100 and the counter electrode layer 200 face each other, or 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 the battery 3400 in Embodiment 3.

[0128] FIG. 11(a) is an x-z diagram (cross-sectional view of 11A) showing a schematic configuration of the battery 3400 in Embodiment 3.

[0129] FIG. 11(b) is an x-y diagram (top perspective view) showing a schematic configuration of the battery 3400 in Embodiment 3.

[0130] As shown in FIG. 11, the first region 310 may have the 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] At this time, the second region 320 may be located covering 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 made larger. As a result, heat from the central portion of the solid electrolyte layer 300 is likely to be propagated (diffused) to the outer edge portion of the solid electrolyte layer 300. Thereby, heat generated in the central portion of the battery (for example, heat generated in the first region 310 or 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 outside the battery).

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

[0135] FIG. 12 is a diagram showing a schematic configuration of the battery 3500 in Embodiment 3.

[0136] FIG. 12(a) is an x-z diagram (cross-sectional view of 12A) showing a schematic configuration of the battery 3500 in Embodiment 3.

[0137] FIG. 12(b) is an x-y diagram (top perspective view) showing a schematic configuration of the battery 3500 in Embodiment 3.

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

[0139] At this time, the second region 320 may be located 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 made larger. As a result, heat from the central portion of the solid electrolyte layer 300 is more likely to be propagated (diffused) to the outer edge portion of the solid electrolyte layer 300 close to each heat generating portion. Thereby, heat generated in the central portion of the battery (for example, heat generated in the first region 310 or 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 outside the battery).

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

[0142] (Embodiment 4) Hereinafter, Embodiment 4 will be described. Descriptions overlapping with any of the above-described Embodiments 1 to 3 will be omitted as appropriate.

[0143] FIG. 13 is a diagram showing a schematic configuration of the battery 4000 in Embodiment 4.

[0144] FIG. 13(a) is an x-z diagram (cross-sectional view of 13A) showing the schematic configuration of the battery 4000 in Embodiment 4.

[0145] FIG. 13(b) is an x-y diagram (top perspective view) showing the schematic configuration of the battery 4000 in Embodiment 4.

[0146] In addition to the configuration of the battery 1000 in Embodiment 1 described above, the battery 4000 in Embodiment 4 further includes the following configuration.

[0147] That is, the battery 4000 in Embodiment 4 further includes an electrode current collector 400 and a counter electrode current collector 500.

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

[0149] The counter electrode current collector 500 is a current collector 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 in contact with the electrode current collector 400 and the counter electrode current collector 500.

[0151] According to the above configuration, it is possible to suppress the electrode current collector 400 and the counter electrode current collector 500 from coming into contact and short-circuiting. That is, the second region 320 having a high solid electrolyte material density (i.e., high strength) can be made to act as a high-strength skeleton structure at 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). Thereby, the outer edge portions of the electrode current collector 400 and the counter electrode current collector 500 can be suppressed from being deformed or having structural defects by the second region 320. For this reason, for example, even in a battery that is large in area and thin in layer (for example, a battery designed to have high output and high capacity), or even in an all-solid-state battery without a separator, the second region 320 can suppress the electrode current collector 400 and the counter electrode current collector 500 from coming into contact and short-circuiting. Therefore, the deformation resistance and impact resistance of the battery can be further enhanced.

[0152] Note that, as shown in FIG. 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] Note that, as shown in FIG. 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. That is, the electrode layer 100 may be formed in a narrower range than the electrode current collector 400.

[0154] Note that, as shown in FIG. 13, the counter electrode current collector 500 may be electrically connected to the counter electrode layer 200 by being in direct contact with 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] Note that, as shown in FIG. 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. That is, the counter electrode layer 200 may be formed in a narrower range than the counter electrode current collector 500.

[0156] Note that, 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 therebetween in the region where the electrode current collector 400 and the counter electrode current collector 500 face each other.

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

[0158] In the present disclosure, the configuration in which the electrode current collector 400 and the counter electrode current collector 500 face each other includes, for example, the meaning of a configuration in which another member (for example, 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 that face each other.

[0159] Note that 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] As the positive electrode current collector, a metal film (for example, a metal foil) made of a metal material (for example, aluminum, copper, stainless steel, etc.), etc., can be used. Further, as the positive electrode current collector, a metal film made of an alloy containing these metal materials can be used. Further, as the positive electrode current collector, a film obtained by film-forming treatment (or laminated) of these metal materials on a film made of another different material can be used.

[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 (for example, a metal foil) made of a metal material (for example, nickel, copper, stainless steel, etc.), etc., can be used. Further, as the negative electrode current collector, a metal film made of an alloy containing these metal materials can be used. Further, as the negative electrode current collector, a film obtained by film-forming treatment (or laminated) of these metal materials on a film made of another different material can be used. with these can be used.

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

[0165] In addition, as shown in FIG. 13, the second region 320 may be disposed only at 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 square 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 at two or more 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 square shape) as shown in FIG. 13, the second region 320 may be disposed on two or more sides of the shape. Thereby, it is possible to suppress the electrode current collector 400 and the counter electrode current collector 500 from coming into contact with each other and short-circuiting at two or more ends.

[0167] FIG. 14 is a diagram showing a schematic configuration of the battery 4100 in Embodiment 4.

[0168] FIG. 14(a) is an x-z diagram (14A cross-sectional view) showing a schematic configuration of the battery 4100 in Embodiment 4.

[0169] FIG. 14(b) is an x-y diagram (top perspective view) showing a schematic configuration of the battery 4100 in Embodiment 4.

[0170] As shown in FIG. 14, the second region 320 may be located surrounding the first region 310, the electrode layer 100, and the counter electrode layer 200. At this time, the second region 320 surrounding the first region 310, the electrode layer 100, and the counter electrode layer 200 may be in contact with the electrode current collector 400 and the counter electrode current collector 500. Thereby, it is possible to suppress the electrode current collector 400 and the counter electrode current collector 500 from coming into contact with each other and short-circuiting at the positions around (e.g., the 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 the battery 4200 in Embodiment 4.

[0172] FIG. 15(a) is an x-z diagram (15A cross-sectional view) showing a schematic configuration of the battery 4200 in Embodiment 4.

[0173] FIG. 15(b) is an x-y diagram (top perspective view) showing a schematic configuration of the battery 4200 in Embodiment 4.

[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] Also, as shown in FIG. 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 passing through the electrode layer 100 and the counter electrode layer 200 among the regions where the electrode current collector 400 and the counter electrode current collector 500 face each other. Thereby, it is possible to further suppress the electrode current collector 400 and the counter electrode current collector 500 from coming into contact with each other and short-circuiting at positions around (for example, four sides) 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 the battery 4300 in Embodiment 4.

[0177] FIG. 16(a) is an x-z diagram (16A cross-sectional view) showing a schematic configuration of the battery 4300 in Embodiment 4.

[0178] FIG. 16(b) is an x-y diagram (top perspective view) showing a schematic configuration of the battery 4300 in Embodiment 4.

[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] Further, 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 in which 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) is narrowed (that is, a battery in which the outer peripheral side surface is narrowed) can be configured. Thereby, the exposed area of the outer edge portion of the solid electrolyte layer 300 can be reduced. For this reason, for example, ventilation of outside air (for example, air, moisture, etc.) to the first region 310 can be more reliably blocked by the second region 320. In addition, the durability (for example, impact resistance) of the outer peripheral side surface of the battery can be further improved. For this reason, the environmental resistance of the battery can be further improved.

[0183] (Embodiment 5) Hereinafter, Embodiment 5 will be described. Descriptions overlapping with any of the above-described Embodiments 1 to 4 will be omitted as appropriate.

[0184] FIG. 17 is a diagram showing a schematic configuration of a battery 5000 in Embodiment 5.

[0185] FIG. 17(a) is an x-z diagram (cross-sectional view taken along line 17A) showing a schematic configuration of a battery 5000 in Embodiment 5.

[0186] FIG. 17(b) is an x-y diagram (top perspective view) showing a schematic configuration of a battery 5000 in Embodiment 5.

[0187] The battery 5000 in Embodiment 5 further includes the following configuration in addition to the configuration of the battery 1000 in the above-described Embodiment 1.

[0188] That is, in the battery 5000 in Embodiment 5, the formation range of the counter electrode layer 200 is larger than the formation range of the electrode layer 100.

[0189] At this time, the electrode layer 100 is positioned within the formation range of the counter electrode layer 200.

[0190] According to the above configuration, since the counter electrode layer 200 is formed with a larger area than the electrode layer 100, precipitation of metal (for example, lithium) in the counter electrode layer 200 can be suppressed. Therefore, a short circuit between the electrode layer 100 and the counter electrode layer 200 due to precipitation of metal can be prevented.

[0191] Note that 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 a narrower range 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 . At this time, the end portion may be arranged without facing the electrode layer 100.

[0192] FIG. 18 is a diagram showing a schematic configuration of the battery 5100 in Embodiment 5.

[0193] FIG. 18(a) is an x-z diagram (cross-sectional view of 18A) showing a schematic configuration of the battery 5100 in Embodiment 5.

[0194] FIG. 18(b) is an x-y diagram (top perspective view) showing a schematic configuration of the battery 5100 in Embodiment 5.

[0195] As shown in FIG. 18, the four end portions (for example, all end portions) of the counter electrode layer 200 may be arranged without facing the electrode layer 100. Thereby, precipitation of metal (for example, lithium) in the counter electrode layer 200 can be further suppressed. Therefore, a short circuit between the electrode layer 100 and the counter electrode layer 200 due to precipitation of metal can be more reliably prevented.

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

[0197] FIG. 19 is a diagram showing a schematic configuration of the battery 5200 in Embodiment 5.

[0198] FIG. 19(a) is an x-z diagram (cross-sectional view of 19A) showing a schematic configuration of the battery 5200 in Embodiment 5.

[0199] FIG. 19(b) is an x-y diagram (top perspective view) showing a schematic configuration of the battery 5200 in Embodiment 5.

[0200] As shown in FIG. 19, in a region where the electrode layer 100 is not located in the region facing the counter electrode layer 200 (for example, a region where the counter electrode layer 200 and the electrode current collector 400 face each other without the electrode layer 100 intervening therebetween), the first region 310 may be disposed. Thereby, 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 responsible for the propagation of metal ions between the electrode layer 100 and the counter electrode layer 200 can be disposed with a larger area. Thereby, the precipitation of metal (for example, lithium) in the counter electrode layer 200 can be more suppressed.

[0201] FIG. 20 is a diagram showing a schematic configuration of the battery 5300 in Embodiment 5.

[0202] FIG. 20(a) is an x-z diagram (cross-sectional view of 20A) showing a schematic configuration of the battery 5300 in Embodiment 5.

[0203] FIG. 20(b) is an x-y diagram (top perspective view) showing a schematic configuration of the battery 5300 in Embodiment 5.

[0204] As shown in FIG. 20, the second region 320 may be disposed only in a region where the electrode layer 100 is not located in the region facing the counter electrode layer 200 (for example, a region where the counter electrode layer 200 and the electrode current collector 400 face each other without the electrode layer 100 intervening therebetween). That is, in the region where the electrode current collector 400 and the counter electrode current collector 500 face each other, the second region 320 may not 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 intervening therebetween.

[0205] (Embodiment 6) Embodiment 6 is described below. Descriptions overlapping with any of the above-described Embodiments 1 to 5 are appropriately omitted.

[0206] FIG. 21 is a diagram showing a schematic configuration of a battery 6000 in Embodiment 6.

[0207] FIG. 21(a) is an x-z diagram (cross-sectional view of 21A) showing a schematic configuration of the battery 6000 in Embodiment 6.

[0208] FIG. 21(b) is an x-y diagram (top perspective view) showing a schematic configuration of the battery 6000 in Embodiment 6.

[0209] The battery 6000 in Embodiment 6 further includes the following configuration in addition to the configuration of the battery 1000 in the above-described Embodiment 1.

[0210] That is, in the battery 6000 in Embodiment 6, the solid electrolyte layer 300 has a third region 330.

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

[0212] The third region 330 is in contact with and 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 changed step by step. That is, the density of the solid electrolyte material can be increased step by step from the central portion to the outer edge portion of the solid electrolyte layer 300. 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 first region 310 and the third region 330 can be made smaller compared to the case where the first region 310 and the third region 330 are in direct contact. As a result, the physical property values (for example, the coefficient of thermal expansion, etc.) between the regions in contact with each other can be made closer to each other. For this reason, the interface matching and adhesion at the contact portions of the first region 310, the second region 320, and the third region 330 can be further improved. That is, the generation 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. Thereby, the heat generated in the central portion of the battery (for example, the heat generated in the first region 310 or the electrode layer 100 or the counter electrode layer 200) can be more easily dissipated to the surface of the third region 330 and the solid electrolyte layer 300 (and the outside of the battery) through the second region 320.

[0217] Also, according to the above configuration, 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 first region 310 and the third region 330 can be set larger. That is, the density of the third solid electrolyte material in the third region 330 can be made sufficiently large. Thereby, the third region 330 with a higher density of the solid electrolyte material can be arranged at the outer edge portion of the solid electrolyte layer 300. For this reason, the heat generated in the central portion of the battery can be more easily dissipated to the surface of the solid electrolyte layer 300 (and the outside of the battery) through the third region 330.

[0218] Note that the electrode layer 100 may contain an electrode active material.

[0219] Also, the counter electrode layer 200 may contain a counter electrode active material.

[0220] At this time, 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] Also, 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] Also, 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 densities of the electrode active material and the counter electrode active material are low (that is, a portion located more centrally in 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 having high heat dissipation properties can be arranged in a more central portion inside the battery. As a result, compared with a configuration having a heat dissipation member only at a position closer to the electrode layer 100 side (or only at a position closer to the counter electrode layer 200 side), heat generated in the central portion of the battery can be more easily propagated to the outer edge portion of the battery.

[0224] Note that the first region 310, the second region 320, and the third region 330 may be regions that do not contain the electrode active material and the 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 (that is, a portion located more centrally in 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 having high heat dissipation properties can be arranged in a more central portion inside the battery. As a result, compared with a configuration having a heat dissipation member only at a position closer to the electrode layer 100 side (or only at a position closer to the counter electrode layer 200 side), heat generated in the central portion of the battery can be more easily propagated to the outer edge portion of the battery.

[0226] In addition, as the third solid electrolyte material, the above-described solid electrolytes that can be used as the first solid electrolyte material can be used.

[0227] Note that the first solid electrolyte material, the second solid electrolyte material, and the third solid electrolyte material may be different from each other. Thereby, for example, while using a solid electrolyte material with high heat dissipation as the second solid electrolyte material and the third solid electrolyte material, a solid electrolyte material with high metal ion conductivity can be used as the first solid electrolyte material.

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

[0229] According to the above configuration, the same solid electrolyte material can be included in the first region 310, the second region 320, and the third region 330. Thereby, the physical property values (for example, thermal expansion coefficient, etc.) of the first region 310, the second region 320, and the third region 330 can be made closer to each other. For this reason, the interface matching and adhesion at the contact portions of the first region 310, the second region 320, and the third region 330 can be further improved. That is, the generation 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. Thereby, the heat generated in the central portion of the battery (for example, the heat generated in the first region 310 or 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 the outside of the battery) via the second region 320 and the third region 330. Further, for example, when the material compositions of the first region 310, the second region 320, and the third region 330 are the same, the manufacturing process of the battery (for example, mixing of the mixture, coating of the mixture, etc.) can be made simpler. In addition, the third solid electrolyte material may be configured as particles. At this time, the third region 330 is a region containing the particles of the third solid electrolyte material. At this time, the third density is the density of the particles of the third solid electrolyte material in the third region 330.

[0230] In addition, the third solid electrolyte material may be composed of particles. At this time, the third region 330 is a region containing the particles of the third solid electrolyte material. At this time, the third density is the density of the particles of the third solid electrolyte material in the third region 330.

[0231] Note that, as shown in FIG. 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. Thereby, the third region 330 can be arranged further away from the center of the battery. Therefore, the heat dissipation performance by the third region 330 can be further enhanced.

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

[0233] Note that, as shown in FIG. 21, the third region 330 may be arranged 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 square shape) as shown in FIG. 21, the third region 330 may be arranged in contact with only one side of the shape.

[0234] Alternatively, the third region 330 may be arranged in contact with two or more 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 arranged in contact with two or more sides of the shape. Thereby, the heat dissipation performance (and strength, environmental resistance, etc.) can be enhanced at two or more ends.

[0235] FIG. 22 is a diagram showing a schematic configuration of the battery 6100 in Embodiment 6.

[0236] FIG. 22(a) is an x - z diagram (22A cross - sectional view) showing a schematic configuration of the battery 6100 in Embodiment 6.

[0237] FIG. 22(b) is an x - y diagram (top perspective view) showing a schematic configuration of the battery 6100 in Embodiment 6.

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

[0239] According to the above configuration, the density of the solid electrolyte material can be gradually increased from the central portion to the four outer edge portions (for example, all of the outer edge portions) of the solid electrolyte layer 300. That is, at the four outer edge portions (for example, all of the outer edge portions) of the solid electrolyte layer 300, the interface alignment and adhesion at the contact portions between the first region 310, the second region 320, and the third region 330 can be further improved. Thereby, heat generated in the central portion of the battery (for example, heat generated in the first region 310 or the electrode layer 100 or the counter electrode layer 200 ) can be more easily dissipated to the third region 330 and the surfaces of the four outer edge portions of the solid electrolyte layer 300 (and the outside of the battery) through the second region 320.

[0240] In the present disclosure, "the third region 330 is positioned surrounding the second region 320" includes, for example, the meaning of "the third region 330 is arranged in contact with all of the ends of the second region 320". That is, for example, if the outer contour shape of the second region 320 is a rectangular shape (for example, a quadrilateral shape) as shown in FIG. 22, the third region 330 may be arranged in contact with all sides of the 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 in Embodiment 6.

[0242] FIG. 23(a) is an x-z diagram (cross-sectional view of 23A) showing a schematic configuration of a battery 6200 in Embodiment 6.

[0243] FIG. 23(b) is an x-y diagram (top perspective view) showing a schematic configuration of a battery 6200 in Embodiment 6.

[0244] As shown in FIG. 23, the second region 320 may have a second overhanging 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] At this time, the third region 330 may be located covering 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 made larger. As a result, heat from the central portion of the solid electrolyte layer 300 is more likely to be propagated (diffused) to the outer edge portion of the solid electrolyte layer 300. Thereby, heat generated in the central portion of the battery (for example, heat generated in the first region 310 or 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).

[0248] FIG. 24 is a diagram showing a schematic configuration of the battery 6300 in Embodiment 6.

[0249] FIG. 24(a) is an x - z diagram (24A cross - sectional view) showing the schematic configuration of the battery 6300 in Embodiment 6.

[0250] FIG. 24(b) is an x - y diagram (top perspective view) showing the schematic configuration of the battery 6300 in Embodiment 6.

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

[0252] At this time, the third region 330 may be located covering 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 made larger. As a result, heat from the central portion of the solid electrolyte layer 300 is more likely to be propagated (diffused) to the outer edge portion of the solid electrolyte layer 300 near each heat generating portion. Thereby, heat generated in the central portion of the battery (for example, heat generated in the first region 310 or 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).

[0254] FIG. 25 is a diagram showing a schematic configuration of the battery 6400 in Embodiment 6.

[0255] FIG. 25(a) is an x-z diagram (cross-sectional view of 25A) showing a schematic configuration of the battery 6400 in Embodiment 6.

[0256] FIG. 25(b) is an x-y diagram (top perspective view) showing a schematic configuration of the battery 6400 in Embodiment 6.

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

[0260] Furthermore, the second region 320 that covers the first protruding portion 311 may have a second protruding 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] At this time, the third region 330 may be positioned so as to cover the second protruding portion 321.

[0263] According to the above configuration, 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 can be made larger. As a result, heat from the central portion of the solid electrolyte layer 300 is more likely to be propagated (diffused) to the outer edge portion of the solid electrolyte layer 300. Thus, heat generated in the central portion of the battery (for example, heat generated in the first region 310 or 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).

[0264] Note that the third region 330 may be positioned 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 with a high density of the solid electrolyte material can be arranged in contact with the outer edge portion (for example, at least one end portion) of the electrode layer 100. As a result, heat from the electrode layer 100 is more likely to be propagated (diffused) to the third region 330. Thus, heat generated in the central portion of the battery (that is, heat generated in the electrode layer 100) can be more easily dissipated to the surface of the solid electrolyte layer 300 (and to the outside of the battery).

[0266] Also, according to the above configuration, the outer edge portion (for example, at least one end portion) of the electrode layer 100 can be covered by the third region 330 with higher strength. Therefore, damage to the outer edge portion of the electrode layer 100 with relatively low strength (for example, the collapse of the electrode material, etc.) can be more suppressed by the third region 330. Accordingly, the strength of the battery can be further improved.

[0267] Also, according to the above configuration, the third region 330 with a higher density of the 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). This can block the ventilation of outside air (for example, air, moisture, etc.) to the outer edge portion of the electrode layer 100 by the third region 330. Therefore, the environmental resistance of the battery can be further improved.

[0268] Note that the third region 330 may be disposed in contact with only one end portion 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 end portions 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. Thereby, the heat dissipation property (and strength, environmental resistance, etc.) can be enhanced at two or more end portions.

[0270] Alternatively, the third region 330 may be positioned surrounding the electrode layer 100.

[0271] According to the above configuration, the third region 330 having a high density of the solid electrolyte material can be disposed in contact with the outer edge portions (e.g., all of the outer edge portions) on the four sides of the electrode layer 100. Thereby, the heat from the electrode layer 100 is easily propagated (diffused) to the third region 330 close to each heat generating portion. Thus, the heat generated in the central portion of the battery (i.e., the heat generated in the electrode layer 100) can be more easily dissipated to the surface of the solid electrolyte layer 300 (and the outside of the battery).

[0272] Further, according to the above configuration, the outer edge portions (e.g., all of the outer edges) on the four sides of the electrode layer 100 can be covered by the third region 330 having higher strength. Therefore, the breakage (e.g., the collapse of the electrode material, etc.) of the outer edge portions on the four sides of the electrode layer 100 having relatively low strength can be more suppressed by the third region 330. Thus, the strength of the battery can be further improved.

[0273] Moreover, according to the above configuration, a third region 330 with a higher density of the solid electrolyte material can be interposed between the outer edge portions on the four sides of the electrode layer 100 and the outside of the battery (for example, the outside air). Thereby, for example, the ventilation of the outside air (for example, air, moisture, etc.) to the outer edge portions on the four sides of the electrode layer 100 can be blocked by the third region 330. Therefore, the environmental resistance of the battery can be further improved.

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

[0275] According to the above configuration, a third region 330 with a high density of the solid electrolyte material can be arranged in contact with the outer edge portion (for example, at least one end portion) of the counter electrode layer 200. Thereby, the heat from the counter electrode layer 200 is more likely to be propagated (diffused) to the third region 330. Thereby, the heat generated in the central portion of the battery (that is, the heat generated in the counter electrode layer 200) can be more easily dissipated to the surface of the solid electrolyte layer 300 (and the outside of the battery).

[0276] Moreover, according to the above configuration, the outer edge portion (for example, at least one end portion) of the counter electrode layer 200 can be covered by the third region 330 with higher strength. Therefore, the breakage of the outer edge portion of the counter electrode layer 200 with relatively weak strength (for example, the collapse of the counter electrode material, etc.) can be more suppressed by the third region 330. Therefore, the strength of the battery can be further improved.

[0277] Moreover, according to the above configuration, between 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 with a higher density of the solid electrolyte material can be interposed. Thereby, for example, the ventilation of the outside air (for example, air, moisture, etc.) to the outer edge portion of the counter electrode layer 200 can be blocked by the third region 330. Therefore, the environmental resistance of the battery can be further improved.

[0278] Note that the third region 330 may be arranged 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 arranged in contact with only one side of the shape.

[0279] Alternatively, the third region 330 may be arranged in contact with two or more 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 arranged in contact with two or more sides of the shape. Thereby, the heat dissipation (and strength, environmental resistance, etc.) can be enhanced at two or more ends.

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

[0281] According to the above configuration, the third region 330 with a high density of the solid electrolyte material can be arranged in contact with the outer edge portions (e.g., all of the outer edge portions) on all four sides of the counter electrode layer 200. Thereby, the heat from the counter electrode layer 200 is easily propagated (diffused) to the third region 330 close to each heat generating portion. Thus, the heat generated in the central portion of the battery (i.e., the heat generated in the counter electrode layer 200) can be more easily dissipated to the surface of the solid electrolyte layer 300 (and the outside of the battery).

[0282] Also, according to the above configuration, the outer edge portions (e.g., all of the outer edges) on all four sides of the counter electrode layer 200 can be covered by the third region 330 with higher strength. Therefore, the breakage of the outer edge portions on all four sides of the counter electrode layer 200 with relatively low strength (e.g., the collapse of the counter electrode material, etc.) can be more suppressed by the third region 330. Thus, the strength of the battery can be further improved.

[0283] Further, according to the above configuration, a third region 330 with a higher solid electrolyte material density can be interposed between the outer edge portions on the four sides of the counter electrode layer 200 and the outside of the battery (for example, the outside air). Thereby, for example, the ventilation of the outside air (for example, air, moisture, etc.) to the outer edge portions on the four sides of the counter electrode layer 200 can be blocked by the third region 330. Therefore, the environmental resistance of the battery can be further improved.

[0284] In the present disclosure, "the third region 330 is located surrounding the electrode layer 100 (or the counter electrode layer 200)" includes, for example, the meaning of "the third region 330 is arranged in contact with all of the ends 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 (for example, a square shape), the third region 330 may be arranged in contact with all sides of the shape.

[0285] FIG. 26 is a diagram showing a schematic configuration of a battery 6500 in Embodiment 6.

[0286] FIG. 26(a) is an x-z diagram (cross-sectional view of 26A) showing a schematic configuration of the battery 6500 in Embodiment 6.

[0287] FIG. 26(b) is an x-y diagram (top perspective view) showing a schematic configuration of the battery 6500 in Embodiment 6.

[0288] As shown in FIG. 26, the formation range of the counter electrode layer 200 may be larger than the formation range of the electrode layer 100. It may be larger.

[0289] At this time, the electrode layer 100 may be located within the formation range of the counter electrode layer 200.

[0290] Further, the second region 320 may be located in contact with the end of the electrode layer 100.

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

[0292] According to the above configuration, since the counter electrode layer 200 is formed with a larger area than the electrode layer 100, precipitation of metal (for example, lithium) in the counter electrode layer 200 can be suppressed. Therefore, a short circuit between the electrode layer 100 and the counter electrode layer 200 due to metal precipitation can be prevented.

[0293] Also, according to the above configuration, while forming the counter electrode layer 200 with a larger area than the electrode layer 100 (that is, while reducing the risk of short circuit due to metal precipitation), a third region 330 with a high density of 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.

[0294] Also, according to the above configuration, while forming the counter electrode layer 200 with a larger area than the electrode layer 100 (that is, while reducing the risk of short circuit due to metal precipitation), a second region 320 with a high density of solid electrolyte material can be disposed in contact with the outer edge portion (for example, at least one end portion) of the electrode layer 100.

[0295] FIG. 27 is a diagram showing a schematic configuration of a battery 6600 in Embodiment 6.

[0296] FIG. 27(a) is an x - z diagram (cross - sectional view of 27A) showing a schematic configuration of the battery 6600 in Embodiment 6.

[0297] FIG. 27(b) is an x - y diagram (top perspective view) showing a schematic configuration of the battery 6600 in Embodiment 6.

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

[0299] At this time, the third region 330 may be located surrounding the counter electrode layer 200.

[0300] According to the above configuration, while forming the counter electrode layer 200 with a larger area than the electrode layer 100 (that is, while reducing the risk of short circuit due to metal deposition), the third region 330 with a high density of solid electrolyte material can be disposed in contact with the four outer edge portions (for example, all of the outer edge portions) of the counter electrode layer 200.

[0301] Also, according to the above configuration, while forming the counter electrode layer 200 with a larger area than the electrode layer 100 (that is, while reducing the risk of short circuit due to metal deposition), the second region 320 with a high density of solid electrolyte material can be disposed in contact with the four outer edge portions (for example, all of the outer edge portions) of the electrode layer 100.

[0302] FIG. 28 is a diagram showing a schematic configuration of the battery 6700 in Embodiment 6.

[0303] FIG. 28 is an x-z diagram (cross-sectional view of 28A) showing a schematic configuration of the battery 6700 in Embodiment 6.

[0304] FIG. 28 is an x-y diagram (top perspective view) showing a schematic configuration of the battery 6700 in Embodiment 6.

[0305] As shown in FIG. 28, the first region 310 may be located surrounding the electrode layer 100. That is, the second region 320 may be located without contacting the electrode layer 100. Thereby, 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 responsible for the propagation of metal ions between the electrode layer 100 and the counter electrode layer 200 can be disposed with a larger area. Thereby, the precipitation of metal (for example, lithium) in the counter electrode layer 200 can be more suppressed.

[0306] (Embodiment 7) Hereinafter, Embodiment 7 will be described. Descriptions overlapping with any of the above-described Embodiments 1 to 6 will be omitted as appropriate.

[0307] FIG. 29 is a diagram showing a schematic configuration of the battery 7000 in Embodiment 7.

[0308] FIG. 29 is an x-z diagram (cross-sectional view taken along line 29A) showing a schematic configuration of the battery 7000 in Embodiment 7.

[0309] FIG. 29 is an x-y diagram (top perspective view) showing a schematic configuration of the battery 7000 in Embodiment 7.

[0310] The battery 7000 in Embodiment 7 further includes the following configuration in addition to the configuration of the battery 6000 in Embodiment 6 described above.

[0311] That is, the battery 7000 in Embodiment 7 further includes an electrode current collector 400 and a counter electrode current collector 500.

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

[0313] The counter electrode current collector 500 is a current collector 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 in contact with the electrode current collector 400 and the counter electrode current collector 500.

[0315] According to the above configuration, it is possible to suppress the electrode current collector 400 and the counter electrode current collector 500 from coming into contact with each other and short-circuiting. That is, the third region 330 having a high solid electrolyte material density (i.e., high strength) can be made to act as a high-strength skeleton structure at 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). Thereby, the third region 330 can suppress the outer edge portions of the electrode current collector 400 and the counter electrode current collector 500 from being deformed or having structural defects, respectively. For this reason, for example, even in a battery that is large in area and thin in layer (for example, a battery designed to have high output and high capacity), or even in an all-solid-state battery without a separator, the third region 330 can suppress the electrode current collector 400 and the counter electrode current collector 500 from coming into contact with each other and short-circuiting. Therefore, the deformation resistance and impact resistance of the battery can be further enhanced.

[0316] Note that 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 passing through the electrode layer 100 and the counter electrode layer 200, among the regions where the electrode current collector 400 and the counter electrode current collector 500 face each other.

[0317] Note that the third region 330 may be disposed only at 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 only on one side of the shape.

[0318] Alternatively, the third region 330 may be disposed at two or more 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 quadrilateral shape), the third region 330 may be disposed on two or more sides of the shape. Thereby, it is possible to suppress the electrode current collector 400 and the counter electrode current collector 500 from coming into contact and short-circuiting at two or more ends.

[0319] Alternatively, the third region 330 may be located surrounding the second region 320, the electrode layer 100, and the counter electrode layer 200. At this time, the third region 330 surrounding the second region 320, the electrode layer 100, and the counter electrode layer 200 may be in contact with the electrode current collector 400 and the counter electrode current collector 500. Thereby, it is possible to suppress the electrode current collector 400 and the counter electrode current collector 500 from coming into contact and short-circuiting at positions around the laminate of the second region 320, the electrode layer 100, and the counter electrode layer 200 (e.g., all around).

[0320] Note that the third region 330 may be disposed over 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 therebetween, among the regions where the electrode current collector 400 and the counter electrode current collector 500 face each other. Thereby, it is possible to further suppress the electrode current collector 400 and the counter electrode current collector 500 from coming into contact with each other and short-circuiting at positions around (e.g., on all four sides) the laminate 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 the battery 7100 in Embodiment 7.

[0322] FIG. 30 is an x-z diagram (cross-sectional view taken along line 30A) showing a schematic configuration of the battery 7100 in Embodiment 7.

[0323] FIG. 30 is an x-y diagram (top perspective view) showing a schematic configuration of the battery 7100 in Embodiment 7.

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

[0325] At this time, 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] Also, 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] Also, 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, a battery in which 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) is narrowed (that is, a battery in which the outer peripheral side surface is narrowed) can be configured. Thereby, the exposed area of the outer edge portion of the solid electrolyte layer 300 can be reduced. For this reason, for example, ventilation of outside air (for example, air, moisture, etc.) to the first region 310 can be more reliably blocked by the second region 320 and the third region 330. This can be achieved. In addition, the durability (for example, impact resistance) of the outer peripheral side surface of the battery can be further improved. For this reason, the environmental resistance of the battery can be further improved.

[0330] In addition, in Embodiments 1 to 7, a part (or all) of the side surface of the battery may be covered with an insulating material (for example, a sealing material). Thereby, the battery can be more firmly sealed. At this time, the sealing material may be, for example, a moisture-proof laminate sheet. Thereby, it is possible to prevent the battery from deteriorating due to moisture by the sealing material. Further, the battery may be enclosed in a sealing case. As the sealing case, generally known battery cases (for example, laminate bags, metal cans, resin cases, etc.) can be used.

[0331] In addition, the battery in Embodiments 1 to 7 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 outside the upper and lower surfaces (or side surfaces) of the battery. One of the external electrodes may be connected to, for example, a current collector (for example, the electrode current collector 400) located at one end of the battery. At this time, the other of the external electrodes may be connected to, for example, a current collector (for example, the counter electrode current collector 500) located at the other end of the battery. Thereby, discharging to a load connected to the pair of external electrodes and charging the battery by a charging device connected to the pair of external electrodes become possible.

[0332] In addition, the configurations described in each of the above Embodiments 1 to 7 may be combined with each other as appropriate.

[0333] [Method for manufacturing a battery] An example of the method for manufacturing a battery in Embodiments 1 to 7 will be described below.

[0334] First, pastes used for printing and forming the first region 310, the second region 320, the positive electrode layer, and the negative electrode layer are prepared. Note that the pastes for the first region 310 and the second region 320 may be made from the same solid electrolyte material or different solid electrolyte materials. As the solid electrolyte raw material used in the composition components of the first region 310, the second region 320, the positive electrode layer, and the negative electrode layer, glass powder of a Li2S-P2S5-based sulfide having a mean particle diameter of about 10 μm and mainly composed of triclinic crystals is prepared. As this compacted powder, one having high ionic conductivity (for example, 2 to 3×10 -3 S / cm) can be used. For forming the first region 310 and the second region 320, a solid electrolyte paste is prepared by adding an organic binder and a solvent to the above-described glass powder and mixing and dispersing them. As the positive electrode active material, powder of a Li·Ni·Co·Al composite oxide (LiNi 0.8 Co 0.15 Al 0.05 O2) having a mean particle diameter of about 5 μm and a layered structure is used. A positive electrode layer paste composed of a composition containing this active material and the above-described glass powder is similarly prepared. Further, as the negative electrode active material, powder of natural graphite having a mean particle diameter of about 10 μm is used. A negative electrode layer paste composed of a composition containing this active material and the above-described glass powder is similarly prepared.

[0335] Next, a copper foil having a thickness of about 30 μm, which is used as the positive electrode current collector and the negative electrode current collector, is prepared. By the screen printing method, the paste for the positive electrode layer and the paste for the negative electrode layer are printed on one surface of each copper foil in a predetermined shape and with a thickness of about 50 to 100 μm, respectively. These are dried at 80 to 130 °C to have a thickness of 30 to 60 μm. Thereby, current collectors (copper foils) on which a printed body serving as the positive electrode layer and a printed body serving as the negative electrode layer are respectively formed are obtained.

[0336] Next, on the surface of the current collector on which the printed body that becomes the positive electrode layer and the printed body that becomes the negative electrode layer are respectively formed, using a metal mask, the above-mentioned solid electrolyte paste is printed with a thickness of about 100 μm. Then, these are dried at 80 to 130°C.

[0337] Next, the solid electrolyte layer on the positive electrode layer side and the solid electrolyte layer on the negative electrode layer side are laminated so as to face each other and housed in a rectangular outer die type. Next, an elastic body sheet (70 μm thick) having a modulus of elasticity of about 5×10 6 Pa is inserted between the pressure die punch. Then, by pressing this at a pressure of 300 MPa while heating to 50°C for 90 seconds, a laminate is obtained.

[0338] Note that as the solid electrolyte material, the positive electrode active material, and the negative electrode active material, materials that satisfy the mutual relationship of the Young's modulus (longitudinal elastic modulus) of "solid electrolyte material (20 GPa) < positive electrode active material and negative electrode active material (150 GPa)" can be used. Here, the Young's modulus of a general sulfide-based solid electrolyte is 10 to 30 GPa. Also, metals and oxides have a Young's modulus of 100 to 300 GPa.

[0339] Also, as the dry films of the pastes for the solid electrolyte layer, the positive electrode layer, and the negative electrode layer, those that satisfy the relationship of "solid electrolyte (about 30%) > positive electrode active material and negative electrode active material (about 10%)" in the compression rate before and after pressing during lamination can be used. The compression characteristics of the paste printed body can be controlled by the manufacturing process (for example, design of the binder or solvent, drying method, etc.). Here, since pressure deformation also occurs with the Young's modulus of the sulfide-based solid electrolyte, by using the sulfide-based solid electrolyte, the compression rate can be easily increased.

[0340] By using a raw material that satisfies the relationship of elastic characteristics or compression characteristics as described above and integrally pressurizing it by the method described above, a laminate satisfying the relationship of "second density (relative density 90%) > first density (relative density 82%)" can be obtained. Here, the relative density means the ratio to the theoretical density. In the case of the above-mentioned sulfide-based glass powder, the density (theoretical value) calculated from the unit cell of the crystal structure is 2.0 g / cm 3 is. On the other hand, the density and conductivity of the first region 310 are 1.64 g / cm 3 when it is, 2.2×10 -3 S / cm. Also, the density and conductivity of the second region 320 are 1.8 g / cm 3 when it is, 2.5×10 -3 S / cm. The density inside the battery can be confirmed by cross-sectional observation using, for example, SEM. Also, the conductivity can be evaluated by a fine property evaluation instrument such as a microprobe.

[0341] Note that test samples with the same relative density can be created to evaluate the conductivity. Here, the first region 310 is the battery operating part. 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, the higher the conductivity of the first region 310, the more desirable. On the other hand, the second region 320 (and the third region 330) is a region with relatively little involvement in ion exchange. Therefore, the relationship "conductivity of the first region 310 < conductivity of the second region 320" may be satisfied. At this time, the effective thermal conductivity changes similarly corresponding to the density or conductivity due to the increase in the effective area and the conductive carriers which are also thermal conduction carriers. Therefore, the relationship between the density and the conductivity is reflected in the thermal conductivity. Thus, when the relationship "conductivity of the first region 310 < conductivity of the second region 320" is satisfied, the same relative relationship is also satisfied for the thermal conductivity. Note that the effective conductivity and the thermoelectric conductivity increase corresponding to the increase in density (furthermore, generally, the strength also increases). In particular, sulfide-based solid electrolytes have a higher elastic modulus and pressure sinterability than general inorganic substances. Therefore, even from the compact powder, by increasing its packing rate (i.e., density) by pressure or heating, it is possible to widely improve the density, conductivity, and strength together.

[0342] Note that when forming the first region 310 from the compact powder, the relative density may be controlled to be equal to or higher than the percolation threshold at which the conductivity rises sharply with respect to the relative density. That is, the first density may be a density equal to or higher than the percolation threshold. Thereby, an appropriate height of conductivity can be obtained according to the powder. Above the percolation threshold, the conductivity with respect to the density increase improves gently. Therefore, for the compatibility between the operation of the battery and the density relationship in the solid electrolyte layer 300, a relative density equal to or higher than the percolation threshold is suitable. Note that in the case of the above-mentioned sulfide-based glass powder, the percolation threshold obtained from the pressure dependence of the density and the conductivity was at a relative density of about 70%. On the other hand, the first region 310 and the second region 320 were formed with relative densities of 82% and 90% respectively. Note that test samples with the same relative density can be created to evaluate the conductivity. Here, the first region 310 is the battery operating part. 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, the higher the conductivity of the first region 310, the more desirable. On the other hand, the second region 320 (and the third region 330) is a region with relatively little involvement in ion exchange. Therefore, the relationship "conductivity of the first region 310 < conductivity of the second region 320" may be satisfied. At this time, the effective thermal conductivity changes similarly corresponding to the density or conductivity due to the increase in the effective area and the conductive carriers which are also thermal conduction carriers. Therefore, the relationship between the density and the conductivity is reflected in the thermal conductivity. Thus, when the relationship "conductivity of the first region 310 < conductivity of the second region 320" is satisfied, the same relative relationship is also satisfied for the thermal conductivity. Note that the effective conductivity and the thermoelectric conductivity increase corresponding to the increase in density (furthermore, generally, the strength also increases). In particular, sulfide-based solid electrolytes have a higher elastic modulus and pressure sinterability than general inorganic substances. Therefore, even from the compact powder, by increasing its packing rate (i.e., density) by pressure or heating, it is possible to widely improve the density, conductivity, and strength together.

[0343] When the pressure-compacted bodies in the positive electrode layer, negative electrode layer, and solid electrolyte layer are pressurized, the compressibility of the solid electrolyte layer may be greater than that of the positive electrode layer and the negative electrode layer. As can be seen from the above-mentioned Young's modulus and compression characteristics, the positive electrode layer and the negative electrode layer are hard layers that are difficult to compress. In contrast, the second region 320 is soft and easily compressible. Therefore, when the elastic body inserted between the mold and the laminate compresses while deforming under pressure, the second region 320 is selectively compressed more than the positive electrode layer or the negative electrode layer. In contrast, in the first region 310, since the positive electrode layer and the negative electrode layer exist above and below the pressure application axis, the pressure is absorbed and lost. Therefore, the attenuated pressure is transmitted to the second region 320. For this reason, the second region 320 inevitably has a lower density value than the first region 310. In this way, the density relationship of "second density > first density" is satisfied.

[0344] In addition, in the above manufacturing method, the density difference between the first density and the second density can be increased by means such as significantly setting the difference in the relationship of the Young's modulus or compressibility of the constituent materials, or softening (or thickening) the hardness of the elastic body sheet. At this time, a configuration in which the thickness of the second region 320 is thinner than the thickness of the first region 310 can be realized.

[0345] In addition, 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. Thereby, a battery having a third region 330 can be manufactured by the above manufacturing method.

[0346] In addition, the density relationship of each region in the solid electrolyte layer can be realized not only by an example of the above manufacturing method but also by the following manufacturing method.

[0347] That is, as the paste for forming the second region 320 (or the third region 330), a paste having a higher density of the solid electrolyte material than the first region 310 (for example, a paste having a higher solid content ratio) may be prepared. At this time, by adjusting the amounts of the solid electrolyte material and other contained materials (for example, binder, etc.) contained in the paste, the density of each paste can be adjusted. These pastes having different densities may be respectively printed and formed on the surface of the current collector. Then, a laminate (battery) may be produced by pressing with a general parallel plate rigid body.

[0348] Alternatively, after printing and drying each paste, a method of selectively pressing the second region 320 (or the third region 330) more strongly than the first region 310 may be used. For example, a lamination pressing method using a mold with unevenness may be used.

[0349] Alternatively, after coating a high-density green sheet for the second region 320 (or the third region 330), the portion to be the first region 310 may be punched out by a punching process. Then, a method of filling (or printing) the paste for forming the first region 310 into the recess formed thereby may be used.

[0350] In addition, in the above manufacturing method, by adjusting the formation positions of the first region 310, the second region 320, and the third region 330, each of the batteries shown in the above-described Embodiments 1 to 7 can be produced.

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, etc.) used in various electronic devices or automobiles.

Explanation of Signs

[0352] 100 Electrode layer 200 Counter electrode layer 300 Solid electrolyte layer 310 First region 311 First protruding part 320 Second area 321 Second protruding 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 Batteries

Claims

1. An electrode layer, A counter electrode layer that is the counter electrode of the electrode layer, A solid electrolyte layer located between the electrode layer and the counter electrode layer, An electrode current collector electrically connected to the electrode layer, A counter electrode current collector electrically connected to the counter electrode layer, Comprising, 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 within the region where the electrode layer and the counter electrode layer face each other, The second region is located in contact with the first region on the outer peripheral side of the region where the electrode layer and the counter electrode layer face each other with respect to the first region, Taking the density of the first solid electrolyte material in the first region as the first density, Taking the density of the second solid electrolyte material in the second region as the second density, The second density is higher than the first density, The second region is located between the electrode current collector and the counter electrode current collector in contact with the electrode current collector and the counter electrode current collector, Battery.

2. Taking the distance between the electrode current collector and the counter electrode current collector at the position where the first region is disposed as the first distance, Taking the distance between the electrode current collector and the counter electrode current collector at the position where the second region is disposed as the second distance, The second distance is smaller than the first distance, The battery according to claim 1.

3. The solid electrolyte layer has a third region containing a third solid electrolyte material, The third region is located in contact with the second region, The second region is located between the first region and the third region, Taking the density of the third solid electrolyte material in the third region as the third density, The third density is higher than the second density, The battery according to claim 1.

4. The third region is located between the electrode current collector and the counter electrode current collector in contact with the electrode current collector and the counter electrode current collector, The battery according to claim 3.

5. Taking the distance between the electrode current collector and the counter electrode current collector at the position where the first region is disposed as the first distance, Taking the distance between the electrode current collector and the counter electrode current collector at the position where the second region is disposed as the second distance, Taking the distance between the electrode current collector and the counter electrode current collector at the position where the third region is disposed as the third distance, The second distance is smaller than the first distance, The third distance is smaller than the second distance, The battery according to claim 4.

Images