Solid-state battery, electronic device, and method of manufacturing electronic device

Abstract

To achieve a solid-state battery having high versatility.SOLUTION: A solid-state battery 1 includes a battery body 1a, and three or more electrodes, for example, four electrodes of an electrode 60, an electrode 70, an electrode 80 and an electrode 90, which are provided on the battery body 1a and separated from each other. The battery body 1a has an electrolyte layer 50 and a plurality of electrode layers separated from each other by part of the electrolyte layer. The plurality of electrode layers are connected to the electrode 60, the electrode 70, the electrode 80 and the electrode 90, respectively. In the solid-state battery 1, any two electrodes among the electrode 60, the electrode 70, the electrode 80 and the electrode 90 can be selected as a positive electrode and a negative electrode, and battery voltage can be changed by the combination of selected two electrodes. Thus, one solid-state battery 1 can be used as a solid-state battery outputting different battery voltages, so that the types of mountable electronic devices can be increased and the versatility of the solid-state battery 1 can be enhanced.SELECTED DRAWING: Figure 13

Description

[Technical Field]

[0001] The present invention relates to a solid-state battery, an electronic device, and a method for manufacturing an electronic device. [Background technology]

[0002] Regarding solid-state batteries, a technology is known in which a solid electrolyte having a plate-shaped main body and a peripheral convex portion provided along the periphery of one surface thereof is used to increase strength by its shape. Furthermore, a technology is known in which a laminated structure is obtained in which a positive electrode or a negative electrode is disposed in the region surrounded by the peripheral convex portion of the solid electrolyte, and a technology is known in which the laminated structure is stacked so that the positive electrode and the negative electrode alternate.

[0003] Furthermore, with regard to a lithium ion secondary battery in which first and second electrode layers are alternately stacked with an electrolyte region interposed therebetween, a technology is known in which Li2MnO3 is used as the active material for the first and second electrode layers to obtain a non-polar lithium ion secondary battery in which it is not necessary to distinguish between a positive electrode and a negative electrode. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-152197 [Patent Document 2] Japanese Patent Application Laid-Open No. 2011-216235 Summary of the Invention [Problem to be solved by the invention]

[0005] In a solid-state battery having a battery body with a plurality of electrode layers and an electrolyte layer provided therebetween, two electrodes are provided: a positive electrode connected to an electrode layer functioning as a positive electrode layer, and a negative electrode connected to an electrode layer functioning as a negative electrode layer. The solid-state battery operates at a voltage (referred to as a "battery voltage") indicated by the potential difference between these two electrodes, i.e., the potential difference between the electrode layers (positive electrode layer and negative electrode layer) to which they are respectively connected.

[0006] When a solid-state battery is installed in an electronic device, a solid-state battery is selected that can supply the voltage required to operate the electronic device (called the "operating voltage") from two electrodes. Therefore, it has been necessary to prepare a solid-state battery with a different battery voltage for each electronic device with a different operating voltage. Therefore, conventional solid-state batteries have been limited in their use to supply a single operating voltage, which has sometimes limited the types of electronic devices that can be installed.

[0007] In one aspect, the present invention aims to realize a highly versatile solid-state battery. [Means for solving the problem]

[0008] In one embodiment, the battery includes a battery body having a plurality of electrode layers and an electrolyte layer provided between the plurality of electrode layers, and three or more electrodes provided in the battery body and connected to the plurality of electrode layers, the electrodes being separated from one another, and any two of the three or more electrodes can be selected as a positive electrode and a negative electrode. The battery is used as a battery for outputting a battery voltage indicated by the potential difference between the two selected electrodes to an electronic device that is connected to the two electrodes and operates at a predetermined operating voltage. A solid-state battery is provided.

[0009] In another aspect, an electronic device including an electronic device equipped with a solid-state battery, and a method for manufacturing such an electronic device are provided. [Effects of the Invention]

[0010] On the one hand, it will be possible to realize highly versatile solid-state batteries. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram (part 1) illustrating an example of a solid-state battery. [Figure 2] FIG. 2 is a diagram (part 2) illustrating an example of a solid-state battery. [Figure 3] FIG. 10 is a diagram (part 3) illustrating an example of a solid-state battery. [Figure 4] FIG. 10 is a diagram (part 4) illustrating an example of a solid-state battery. [Figure 5] FIG. 5 is a diagram (part 5) illustrating an example of a solid-state battery. [Figure 6] FIG. 6 is a diagram (part 6) illustrating an example of a solid-state battery. [Figure 7] FIG. 7 is a diagram (part 7) illustrating an example of a solid-state battery. [Figure 8] FIG. 8 is a diagram (part 8) illustrating an example of a solid-state battery. [Figure 9] FIG. 9 is a diagram (part 9) for explaining an example of a solid-state battery. [Figure 10] FIG. 1 is a diagram (part 1) illustrating an example of a method for manufacturing a solid-state battery. [Figure 11] FIG. 2 is a diagram (part 2) illustrating an example of a method for manufacturing a solid-state battery. [Figure 12] FIG. 10 is a diagram (part 3) for explaining an example of a method for manufacturing a solid-state battery. [Figure 13] FIG. 10 is a diagram illustrating an example of electrode selection. [Figure 14] FIG. 10 is a diagram illustrating a first modified example of a solid-state battery. [Figure 15] FIG. 10 is a diagram illustrating a second modified example of the solid-state battery. [Figure 16] 1A and 1B are diagrams illustrating an electronic device including an electronic device equipped with a solid-state battery. DETAILED DESCRIPTION OF THE INVENTION

[0012] Solid-state batteries, such as lithium-ion batteries, are known in which an electrolyte layer using an oxide solid electrolyte or a sulfide solid electrolyte is provided between a positive electrode layer containing a positive electrode active material and a negative electrode layer containing a negative electrode active material. Such solid-state batteries can be fabricated, for example, by stacking electrode layers (positive and negative electrode layers) and an electrolyte layer using a solid electrolyte, thermocompression bonding, and co-firing. Furthermore, by using an appropriate material, such as lithium manganese oxide (Li2MnO3) or iron silicide (FeSi2) as the active material for the electrode layer, a non-polar solid-state battery can be obtained in which the positive and negative electrode layers are indistinguishable before charging or charging / discharging. In solid-state batteries that utilize lithium ion conduction, lithium ions are transported from the positive electrode layer through the electrolyte layer to the negative electrode layer during charging, and from the negative electrode layer through the electrolyte layer to the positive electrode layer during discharging. This lithium ion conduction enables the charge / discharge operation of solid-state batteries. The parameters of the electrode layer that contribute to the performance of the manufactured solid-state battery include lithium ion conductivity and electronic conductivity, and the parameter of the electrolyte layer is lithium ion conductivity.

[0013] Incidentally, a solid-state battery is provided with two electrodes: a positive electrode connected to an electrode layer functioning as a positive electrode layer, and a negative electrode connected to an electrode layer functioning as a negative electrode layer. The battery voltage during operation of the solid-state battery is represented by the potential difference between these two electrodes, i.e., the potential difference between the electrode layers (positive electrode layer and negative electrode layer) to which they are respectively connected. Therefore, the battery voltage of a solid-state battery depends on the configuration of the electrode layers included therein (component materials such as active materials contained in the positive electrode layer and negative electrode layer).

[0014] Conventionally, when a solid-state battery is installed in an electronic device, a solid-state battery that can supply the operating voltage required for the electronic device from two electrodes is selected. Therefore, it was necessary to prepare a solid-state battery with a different battery voltage for each electronic device with a different operating voltage. Therefore, the use of conventional solid-state batteries was limited to supplying one type of operating voltage, which sometimes limited the types of electronic devices that could be installed.

[0015] Therefore, we will use the method described below to realize a highly versatile solid-state battery that is not limited to supplying a single operating voltage. [Solid battery] First, the configuration of the solid-state battery will be described.

[0016] 1 to 9 are diagrams illustrating an example of a solid-state battery. Here, FIG. 1(A) shows a schematic perspective view of a main part of an example of a battery body of a solid-state battery, and FIG. 1(B) shows a schematic perspective view of a main part of an example of a solid-state battery in which electrodes are provided on the battery body. FIG. 2(A) shows a schematic front view of a main part of an example of a battery body, and FIG. 2(B) shows a schematic front view of a main part of an example of a solid-state battery. FIG. 3(A) shows a schematic right side view of a main part of an example of a battery body, and FIG. 3(B) shows a schematic right side view of a main part of an example of a solid-state battery. FIG. 4(A) shows a schematic left side view of a main part of an example of a battery body, and FIG. 4(B) shows a schematic left side view of a main part of an example of a solid-state battery. FIG. 5(A) shows a schematic rear view of a main part of an example of a battery body, and FIG. 5(B) shows a schematic rear view of a main part of an example of a solid-state battery.

[0017] FIG. 6 is a schematic plan view of a main part of an example of a solid-state battery. FIG. 7(A) is a schematic cross-sectional view taken along line II in FIG. 6. FIG. 7(B) is a schematic cross-sectional view taken along line II-II in FIG. 6. FIG. 8(A) is a schematic cross-sectional view taken along line III-III in FIG. 6. FIG. 8(B) is a schematic cross-sectional view taken along line IV-IV in FIG. 6. FIG. 9(A) is a schematic cross-sectional view taken along line VV in FIG. 6. FIG. 9(B) is a schematic cross-sectional view taken along line VI-VI in FIG. 6.

[0018] The solid-state battery 1 is an example of a lithium-ion secondary battery. The solid-state battery 1 includes a battery body 1a as shown in FIG. 1(A), 2(A), 3(A), 4(A), and 5(A). The battery body 1a has a hexahedral shape such as a rectangular parallelepiped. The battery body 1a may also have a hexahedral shape such as a cube. The battery body 1a includes a plurality of electrode layers, such as electrode layer 10, electrode layer 20, electrode layer 30, and electrode layer 40. The battery body 1a further includes an electrolyte layer 50 provided to cover the electrode layer 10, electrode layer 20, electrode layer 30, and electrode layer 40 except for one side end surface of each of the electrode layers. A portion of the electrolyte layer 50 is provided between the electrode layer 10, electrode layer 20, electrode layer 30, and electrode layer 40.

[0019] 1(A) and 2(A), the battery body 1a is provided with four electrode layers 10 as the electrode layers 10. The four electrode layers 10 are provided so that one side end surface of each is exposed from the electrolyte layer 50 (surface 101 of the battery body 1a). Although the number of electrode layers 10 is not limited to four, for the sake of convenience of explanation, a case where the electrode layers 10 are four layers will be taken as an example here.

[0020] 1(A) and 3(A), the battery body 1a is provided with four electrode layers 20. The four electrode layers 20 are provided so that one side end surface of each is exposed from the electrolyte layer 50 (surface 102 of the battery body 1a). Although the number of electrode layers 20 is not limited to four, for the sake of convenience, a case where the electrode layers 20 are four layers will be taken as an example here.

[0021] 4(A), the battery body 1a is provided with three electrode layers 30. The three electrode layers 30 are provided so that one side end surface of each is exposed from the electrolyte layer 50 (surface 103 of the battery body 1a). Although the number of electrode layers 30 is not limited to three, for the sake of convenience, a case where the electrode layers 30 are three layers will be taken as an example here.

[0022] 5(A), the battery body 1a is provided with three electrode layers 40. The three electrode layers 40 are provided so that one side end surface of each is exposed from the electrolyte layer 50 (surface 104 of the battery body 1a). Although the number of electrode layers 40 is not limited to three, for the sake of convenience, a case where the electrode layers 40 have three layers will be taken as an example here.

[0023] In this way, in the battery body 1a, the electrode layer 10, the electrode layer 20, the electrode layer 30, and the electrode layer 40 are provided so that a portion of each is exposed from four different faces 101, 102, 103, and 104 of the hexahedron, respectively. The electrode layer 10, the electrode layer 20, the electrode layer 30, and the electrode layer 40 are separated from each other by portions of the electrolyte layer 50 provided therebetween.

[0024] As will be described later, the four electrode layers 20 and the three electrode layers 30 are provided such that the electrode layers 20 and the electrode layers 30 are alternately stacked with the electrolyte layer 50 interposed therebetween. The four electrode layers 10 are located in the same level as the four electrode layers 20, and are provided side by side with the electrolyte layer 50 interposed therebetween. The three electrode layers 40 are located in the same level as the three electrode layers 30, and are provided side by side with the electrolyte layer 50 interposed therebetween.

[0025] 1(B), 2(B), 3(B), 4(B), and 5(B), the solid-state battery 1 further includes a plurality of electrodes provided on the battery body 1a as described above, here, as an example, four electrodes 60, 70, 80, and 90. The four electrodes 60, 70, 80, and 90 are provided on four surfaces 101, 102, 103, and 104 of the hexahedral battery body 1a, to which portions of the electrode layer 10, electrode layer 20, electrode layer 30, and electrode layer 40 are respectively exposed.

[0026] 1(A) and 1(B) and 2(A) and 2(B), the electrode 60 is provided on a surface 101 of the battery body 1a where a portion of each of the four electrode layers 10 is exposed. The electrode 60 is connected to the four electrode layers 10. The electrode 60 is provided so as to contact the exposed portions of the four electrode layers 10 and the electrolyte layer 50 within the surface 101 where the four electrode layers 10 are exposed.

[0027] 1(A) and 1(B) and 3(A) and 3(B), the electrode 70 is provided on a surface 102 of the battery body 1a where a portion of each of the four electrode layers 20 is exposed. The electrode 70 is connected to the four electrode layers 20. The electrode 70 is provided so as to contact the exposed portions of the four electrode layers 20 and the electrolyte layer 50 within the surface 102 where the four electrode layers 20 are exposed.

[0028] 4(A) and 4(B), the electrode 80 is provided on a surface 103 of the battery body 1a where a portion of each of the three electrode layers 30 is exposed. The electrode 80 is connected to the three electrode layers 30. The electrode 80 is provided so as to contact the exposed portions of the three electrode layers 30 and the electrolyte layer 50 within the surface 103 where the three electrode layers 30 are exposed.

[0029] 5(A) and 5(B), the electrode 90 is provided on a surface 104 of the battery body 1a where a portion of each of the three electrode layers 40 is exposed. The electrode 90 is connected to the three electrode layers 40. The electrode 90 is provided so as to contact the exposed portions of the three electrode layers 40 and the electrolyte layer 50 within the surface 104 where the three electrode layers 40 are exposed.

[0030] The four electrodes 60, 70, 80, and 90 are provided separately from one another. That is, the four electrodes 60, 70, 80, and 90 are provided independently from one another so as not to come into contact with one another and be electrically connected.

[0031] In this example, electrodes 60, 70, 80, and 90 are provided on surfaces 101, 102, 103, and 104, respectively, where portions of electrode layer 10, electrode layer 20, electrode layer 30, and electrode layer 40 are exposed. However, the present invention is not limited to this, and the four electrodes 60, 70, 80, and 90 may be provided so as to partially extend into other surfaces, as long as they are separated from one another.

[0032] As shown in FIG. 1(B), the solid-state battery 1 further includes a marker 200 provided on the battery body 1a. The marker 200 is provided at a position off the center of gravity of a surface 105 on which the four electrodes 60, 70, 80, and 90 are not provided. The marker 200 is used to identify the four electrodes 60, 70, 80, and 90 provided on the surface of the battery body 1a, or to identify the electrode layers 10, 20, 30, and 40 provided inside the battery body 1a and connected to the electrodes 60, 70, 80, and 90, respectively.

[0033] Note that the surface 106 side of the example of the battery body 1a shown in FIG. 1(A) can have the same configuration as the surface 105 side of FIG. 1(A), and the surface 106 side of the example of the solid state battery 1 shown in FIG. 1(B) can have the same configuration as the surface 105 side of FIG. 1(B) except that a marker 200 is provided on the surface 105 side, so they are not shown here.

[0034] The above-described solid-state battery 1 and its battery body 1a will be further described. As shown in FIG. 6, the solid-state battery 1 has a configuration in which a marker 200 is provided on surface 105 of the battery main body 1a, and electrodes 60, 70, 80, and 90 are provided on surfaces 101, 102, 103, and 104 of the battery main body 1a, respectively.

[0035] 7(A), four electrode layers 10 are provided on the end (interior) of the battery body 1a on the side of the surface 101 on which the electrode 60 is provided. The four electrode layers 10 are stacked while being separated from each other by parts of the electrolyte layer 50.

[0036] 7(B), three electrode layers 40 are provided on the end (interior) of the battery body 1a on the side of the surface 104 on which the electrode 90 is provided. The three electrode layers 40 are stacked while being separated from each other by parts of the electrolyte layer 50.

[0037] As shown in FIG. 8(A), the end (interior) of the battery body 1a on the side of the surface 102 on which the electrode 70 is provided is provided with four electrode layers 10 on the surface 101 side, three electrode layers 40 on the surface 104 side, and four electrode layers 20 located therebetween. The four electrode layers 20 are stacked while being separated from each other by a portion of the electrolyte layer 50. The four electrode layers 20 are separated from the four electrode layers 10 and the three electrode layers 40 by a portion of the electrolyte layer 50. The four electrode layers 20 are provided alongside the four electrode layers 10 in the same layer as the four electrode layers 10. The three electrode layers 40 are provided in a layer corresponding to the portion of the electrolyte layer 50 between the four electrode layers 20 (and the four electrode layers 10).

[0038] As shown in FIG. 8(B), the end (interior) of the battery body 1a on the side of the surface 103 on which the electrode 80 is provided is provided with four electrode layers 10 on the surface 101 side, three electrode layers 40 on the surface 104 side, and three electrode layers 30 located therebetween. The three electrode layers 30 are stacked while being separated from each other by a portion of the electrolyte layer 50. The three electrode layers 30 are separated from the four electrode layers 10 and the three electrode layers 40 by a portion of the electrolyte layer 50. The three electrode layers 30 are provided alongside the three electrode layers 40 in the same layer as the three electrode layers 40. The three electrode layers 30 (and the three electrode layers 40) are provided in layers corresponding to the portions of the electrolyte layer 50 between the four electrode layers 10.

[0039] As shown in Figures 9(A) and 9(B), the four electrode layers 20 and the three electrode layers 30 are arranged so that in the region inside (for example, the central portion) of the battery body 1a from the end portion, the electrode layers 20 and the electrode layers 30 are alternately stacked with a part of the electrolyte layer 50 interposed therebetween.

[0040] One side end face of the four-layer electrode layer 20 is exposed on surface 102 of the battery body 1a, and the other side end face is not exposed from the battery body 1a, and an electrode 70 is connected to the one side end face exposed on surface 102. One side end face of the three-layer electrode layer 30 is exposed on surface 103 of the battery body 1a opposite surface 102, and the other side end face is not exposed from the battery body 1a, and an electrode 80 is connected to the one side end face exposed on surface 103.

[0041] One side end face of the four-layer electrode layer 10 is exposed on surface 101 of the battery body 1a, and the other side end face is not exposed from the battery body 1a, and an electrode 60 is connected to the one side end face exposed on surface 101. One side end face of the three-layer electrode layer 40 is exposed on surface 104 of the battery body 1a opposite surface 101, and the other side end face is not exposed from the battery body 1a, and an electrode 90 is connected to the one side end face exposed on surface 104.

[0042] Thus, in the solid-state battery 1, the electrode layers 10, 20, 30, and 40 connected to the electrodes 60, 70, 80, and 90, respectively, are arranged as shown in Figures 7(A), 7(B), 8(A), 8(B), 9(A), and 9(B). The electrode layers 10, 20, 30, and 40 are separated from one another by portions of the electrolyte layer 50.

[0043] In the solid-state battery 1, of the electrode layers 10, 20, 30, and 40 connected to the electrodes 60, 70, 80, and 90, respectively, the electrode layers connected to different electrodes function as a positive electrode layer and a negative electrode layer. The electrodes connected to the electrode layers functioning as a positive electrode layer and a negative electrode layer function as a positive electrode and a negative electrode.

[0044] For example, in the solid-state battery 1, one of the electrode layers 20 and 30 connected to the electrode 70 and the electrode 80, respectively, functions as a positive electrode layer and the other as a negative electrode layer, and one of the electrodes 70 and 80 functions as a positive electrode and the other as a negative electrode.

[0045] For example, in the solid-state battery 1, one of the electrode layers 10 and 40 connected to the electrode 60 and the electrode 90, respectively, functions as a positive electrode layer and the other as a negative electrode layer, and one of the electrodes 60 and 90 functions as a positive electrode and the other as a negative electrode.

[0046] For example, in the solid-state battery 1, one of the electrode layers 10 and 20 connected to the electrode 60 and the electrode 70, respectively, functions as a positive electrode layer and the other as a negative electrode layer, and one of the electrodes 60 and 70 functions as a positive electrode and the other as a negative electrode.

[0047] For example, in the solid-state battery 1, one of the electrode layers 10 and 30 connected to the electrode 60 and the electrode 80, respectively, functions as a positive electrode layer and the other as a negative electrode layer, and one of the electrodes 60 and 80 functions as a positive electrode and the other as a negative electrode.

[0048] For example, in the solid-state battery 1, one of the electrode layers 20 and 40 connected to the electrode 70 and the electrode 90, respectively, functions as a positive electrode layer and the other as a negative electrode layer, and one of the electrodes 70 and 90 functions as a positive electrode and the other as a negative electrode.

[0049] For example, in the solid-state battery 1, one of the electrode layers 30 and 40 connected to the electrode 80 and the electrode 90, respectively, functions as a positive electrode layer and the other as a negative electrode layer, and one of the electrodes 80 and 90 functions as a positive electrode and the other as a negative electrode.

[0050] The materials of the electrode layer 10, the electrode layer 20, the electrode layer 30, and the electrode layer 40 are set so that the layers connected to two electrodes selected as a positive electrode and a negative electrode from the electrodes 60, 70, 80, and 90, respectively, function as a positive electrode layer and a negative electrode layer. For example, the types of active materials contained in the electrode layer 10, the electrode layer 20, the electrode layer 30, and the electrode layer 40 are set.

[0051] Here, examples of the material of the electrolyte layer 50 of the battery body 1a in the solid state battery 1, the material of the electrode layer 10, the electrode layer 20, the electrode layer 30, and the electrode layer 40, and the material of the electrode 60, the electrode 70, the electrode 80, and the electrode 90 will be described.

[0052] The electrolyte layer 50 of the battery body 1a in the solid-state battery 1 contains a solid electrolyte. The solid electrolyte of the electrolyte layer 50 is an oxide solid electrolyte, a sulfide solid electrolyte, or the like. For example, the solid electrolyte of the electrolyte layer 50 is Li, which is a type of NASICON-type oxide solid electrolyte. 1.5 Al 0.5 Ge 1.5 (PO4)3 (hereinafter referred to as "LAGP") is used. LAGP is also known as aluminum-substituted lithium germanium phosphate, etc. The solid electrolyte of the electrolyte layer 50 may be amorphous LAGP (hereinafter referred to as "LAGPg") or crystalline LAGP (hereinafter referred to as "LAGPc"), or both LAGPg and LAGPc may be used.

[0053] The electrode layer 10, the electrode layer 20, the electrode layer 30, and the electrode layer 40 of the battery body 1a in the solid state battery 1 each contain an active material, a solid electrolyte, and a conductive additive. The type of active material is determined depending on whether the electrode layer 10, the electrode layer 20, the electrode layer 30, and the electrode layer 40 are to be positive electrode layers, negative electrode layers, or non-polar electrode layers.

[0054] When the electrode layer 10, the electrode layer 20, the electrode layer 30, and the electrode layer 40 are used as positive electrode layers, they contain a positive electrode active material as an active material. For example, lithium cobalt pyrophosphate (Li2CoP2O7, referred to as "LCPO") is used as the positive electrode active material. Other examples of the positive electrode active material include lithium cobalt phosphate (LiCoPO4), lithium vanadium phosphate (Li3V2(PO4)3, referred to as "LVP"), lithium cobalt oxide (LiCoO2) and its substituted type (LiNi 0.8 Co 0.15 Al 0.05 O2, LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2), lithium nickel manganese oxide (LiNi 0.5 Mn 1.5 O4), lithium iron phosphate (LiFePO4), etc. may also be used.

[0055] When the electrode layer 10, the electrode layer 20, the electrode layer 30, and the electrode layer 40 are used as negative electrode layers, they contain a negative electrode active material as the active material. For example, anatase titanium oxide (TiO2) is used as the negative electrode active material. Other examples of the negative electrode active material include niobium pentoxide (Nb2O5), tungsten oxide (WO2), and lithium titanate (Li4Ti5O 12 ), a type of NASICON-type oxide solid electrolyte, Li 1.3 Al 0.3 Ti 1.7 (PO4)3 (referred to as "LATP"), LVP, nickel silicide (NiSi2), iron silicide (FeSi2), etc. may be used.

[0056] When the electrode layer 10, the electrode layer 20, the electrode layer 30, and the electrode layer 40 are non-polar electrode layers, they contain lithium manganese oxide (Li2MnO3), iron silicide, or the like as active materials. For example, iron silicide is a material that can function both as a negative electrode active material and as a conductive additive. When an electrode layer containing iron silicide is changed into a negative electrode layer (fixed as a negative electrode layer) upon the start of charging or charge / discharge, the iron silicide functions as a negative electrode active material. When an electrode layer containing iron silicide is changed into a positive electrode layer (fixed as a positive electrode layer) upon the start of charging or charge / discharge, the iron silicide functions as a conductive additive.

[0057] Each of the electrode layer 10, the electrode layer 20, the electrode layer 30, and the electrode layer 40 may contain one type of material or two or more types of materials as the active material. An oxide solid electrolyte, for example, LAGP, is used as the solid electrolyte of electrode layer 10, electrode layer 20, electrode layer 30, and electrode layer 40. LAGPg or LAGPc may be used as the solid electrolyte, or both LAGPg and LAGPc may be used.

[0058] The conductive additive for the electrode layer 10, the electrode layer 20, the electrode layer 30, and the electrode layer 40 may be, for example, a carbon material such as carbon nanofiber, carbon black, graphite, graphene, or carbon nanotube. Alternatively, the conductive additive may be, for example, an electrically conductive material such as iron silicide.

[0059] The materials of the electrode layer 10, the electrode layer 20, the electrode layer 30, and the electrode layer 40 are set so that the layers connected to two electrodes selected as a positive electrode and a negative electrode from the electrodes 60, 70, 80, and 90, respectively, function as a positive electrode layer and a negative electrode layer. That is, the materials of the electrode layer 10, the electrode layer 20, the electrode layer 30, and the electrode layer 40 are set so that a predetermined potential difference is obtained between the layers connected to two electrodes selected as a positive electrode and a negative electrode from the electrodes 60, 70, 80, and 90.

[0060] For example, one of the electrode layers 20 and 30 may contain a positive electrode active material and the other may contain a negative electrode active material to form a positive electrode layer and a negative electrode layer, and one of the electrode layers 10 and 40 may contain a positive electrode active material and the other may contain a negative electrode active material to form a positive electrode layer and a negative electrode layer, or both the electrode layers 10 and 40 may be non-polar electrode layers.

[0061] For example, one of the electrode layers 10 and 40 may contain a positive electrode active material and the other may contain a negative electrode active material to form a positive electrode layer and a negative electrode layer, and one of the electrode layers 20 and 30 may contain a positive electrode active material and the other may contain a negative electrode active material to form a positive electrode layer and a negative electrode layer, or both the electrode layers 20 and 30 may be non-polar electrode layers.

[0062] For example, one of the electrode layers 10 and 20 may contain a positive electrode active material and the other may contain a negative electrode active material to form a positive electrode layer and a negative electrode layer, and one of the electrode layers 30 and 40 may contain a positive electrode active material and the other may contain a negative electrode active material to form a positive electrode layer and a negative electrode layer, or both the electrode layers 30 and 40 may be non-polar electrode layers.

[0063] For example, one of the electrode layers 10 and 30 may contain a positive electrode active material and the other may contain a negative electrode active material to form a positive electrode layer and a negative electrode layer, and one of the electrode layers 20 and 40 may contain a positive electrode active material and the other may contain a negative electrode active material to form a positive electrode layer and a negative electrode layer, or both the electrode layers 20 and 40 may be non-polar electrode layers.

[0064] For example, one of the electrode layers 30 and 40 may contain a positive electrode active material and the other may contain a negative electrode active material to form a positive electrode layer and a negative electrode layer, and one of the electrode layers 10 and 20 may contain a positive electrode active material and the other may contain a negative electrode active material to form a positive electrode layer and a negative electrode layer, or both the electrode layers 10 and 20 may be non-polar electrode layers.

[0065] The materials of the electrode layer 10, the electrode layer 20, the electrode layer 30, and the electrode layer 40 are set so that when they are connected to two electrodes selected as a positive electrode and a negative electrode from the electrodes 60, 70, 80, and 90, respectively, they exhibit a predetermined potential difference and function as a positive electrode layer and a negative electrode layer.

[0066] Various conductive materials are used for the electrodes 60, 70, 80, and 90 of the solid-state battery 1. For example, the electrodes 60, 70, 80, and 90 may be made of a dried and hardened conductive paste containing a metal, or a metal deposited by sputtering or vapor deposition. The metals used for the electrodes 60, 70, 80, and 90 may include silver (Ag), platinum (Pt), palladium (Pd), gold (Au), copper (Cu), and the like. The electrodes 60, 70, 80, and 90 may be made of the same material or different materials. The electrodes 60, 70, 80, and 90 are provided independently and separated from one another, i.e., not electrically connected to one another.

[0067] [Solid-state battery manufacturing method] Next, a method for manufacturing the solid state battery 1 will be described. In manufacturing the solid state battery 1, for example, an electrolyte sheet, an electrode layer paste, and an embedding layer paste are prepared.

[0068] For example, to form an electrolyte sheet, a paste containing a solid electrolyte, a binder, a plasticizer, a dispersant, and a diluent is used, and the paste is coated and dried, for example, using a sheet forming machine such as a doctor blade, and then dried to prepare an electrolyte sheet.

[0069] The electrode layer paste is prepared containing an active material, a solid electrolyte, a conductive additive, a binder, a plasticizer, a dispersant, and a diluent. The electrode layer paste is prepared containing material components such as the active material to be used for the electrode layer 10, the electrode layer 20, the electrode layer 30, and the electrode layer 40. The solid electrolyte used in the electrode layer paste may be the same as or different from the solid electrolyte used in the electrolyte sheet.

[0070] The buried layer paste contains a solid electrolyte, a binder, a plasticizer, a dispersant, and a diluent. The solid electrolyte of the buried layer paste may be the same as or different from the solid electrolyte used in the electrolyte sheet.

[0071] The prepared electrolyte sheet, electrode layer paste, and buried layer paste are used to manufacture the solid state battery 1. 10 to 12 are diagrams illustrating an example of a manufacturing method for a solid-state battery. FIG. 10(A) shows a cross-sectional view of a main part of an example of a first electrode layer forming process, FIG. 10(B) shows a cross-sectional view of a main part of an example of a first buried layer forming process, FIG. 10(C) shows a cross-sectional view of a main part of an example of a second electrode layer forming process, and FIG. 10(D) shows a cross-sectional view of a main part of an example of a second buried layer forming process. FIG. 11(A) shows a cross-sectional view of a main part of an example of an electrode layer part stacking process, and FIG. 11(B) shows a cross-sectional view of a main part of an example of a cutting process. FIG. 12(A) shows a cross-sectional view of a main part of an example of a firing process, and FIG. 12(B) shows a cross-sectional view of a main part of an example of an electrode forming process.

[0072] As shown in Fig. 10(A), an electrode layer paste containing material components for the electrode layer 10 and an electrode layer paste containing material components for the electrode layer 20 are applied to predetermined regions of the electrolyte sheet 50a using a screen printing method and dried to form the electrode layer 10 and the electrode layer 20. After the electrode layer 10 and the electrode layer 20 are formed, as shown in Fig. 10(B), a burying layer paste is applied around them and dried to form the burying layer 50b. This forms the electrode layer part 2 shown in Fig. 10(B).

[0073] Similarly, as shown in Fig. 10(C), an electrode layer paste containing material components for the electrode layer 30 and an electrode layer paste containing material components for the electrode layer 40 are applied to predetermined regions of the electrolyte sheet 50a using a screen printing method and dried to form the electrode layer 30 and the electrode layer 40. After the electrode layer 30 and the electrode layer 40 are formed, as shown in Fig. 10(D), a burying layer paste is applied around them and dried to form the burying layer 50b. This forms the electrode layer part 3 shown in Fig. 10(D).

[0074] After the electrode layer parts 2 and 3 are formed, they are alternately stacked, and an electrolyte sheet 50a is stacked on the top layer, and these are thermocompression bonded to form a stack 4 as shown in Fig. 11(A). When forming the stack 4, the electrode layer parts 2 and 3 are formed in advance and alternately stacked so that the electrode layers 20 and 30 are in a positional relationship (Fig. 9(A)) in which the electrode layers 20 and 30 partially overlap with the electrolyte sheet 50a interposed therebetween. Furthermore, the electrode layer parts 2 and 3 are formed in advance and alternately stacked so that the electrode layers 10, 20, 30, and 40 are in a positional relationship in which the electrode layers 10, 20, 30, and 40 overlap with the electrolyte sheet 50a and embedded layer 50b interposed therebetween, respectively.

[0075] After the laminate 4 is formed, as shown in Fig. 11(B), the laminate 4 is cut using a cutting machine to form individual pieces 4a. The electrode layer 10 is exposed on one cut surface of each of the individual pieces 4a obtained by this cutting, and the electrode layer 40 is exposed on the other cut surface. Although not shown in Fig. 11(B), the electrode layer 20 is exposed on another cut surface of each of the individual pieces 4a obtained by cutting (toward the depth of the paper in Fig. 11(B)), and the electrode layer 30 is exposed on another cut surface (toward the viewer in Fig. 11(B)) (Fig. 9(A)).

[0076] After cutting the laminate 4, the resulting pieces 4a are subjected to a heat treatment for degreasing and firing, as shown in FIG. 12(A). In the heat treatment, degreasing is performed, for example, in an oxygen-containing atmosphere at a predetermined temperature and time. In the heat treatment, sintering is performed, for example, in a nitrogen-containing atmosphere at a predetermined temperature and time. The heat treatment degreases the electrode layers 10, 20, 30, and 40 and sinters the solid electrolytes in each layer. Furthermore, the electrolyte sheet 50a and the buried layer 50b are degreased and sintered, and the electrolyte sheet 50a and the buried layer 50b are integrated to form the electrolyte layer 50. This results in the formation of a battery body 1a as shown in FIG. 12(A).

[0077] As shown in Fig. 12(A), in the battery body 1a, one side end face of the electrode layer 10 is exposed on a surface 101, and one side end face of the electrode layer 40 is exposed on a surface 104. Although not shown in Fig. 12(A), in the battery body 1a, one side end face of the electrode layer 20 is exposed on another surface 102 (toward the depth of the paper in Fig. 12(A)), and one side end face of the electrode layer 30 is exposed on another surface 103 (toward the viewer in Fig. 12(A)) (Fig. 9(A)).

[0078] After the battery body 1a is formed, as shown in FIG. 12(B), an electrode 60 connected to the electrode layer 10 is formed on a surface 101 of the battery body 1a where the electrode layer 10 is exposed, and an electrode 90 connected to the electrode layer 40 is formed on a surface 104 where the electrode layer 40 is exposed. Although not shown in FIG. 12(B), an electrode 70 connected to the electrode layer 20 is formed on a surface 102 of the battery body 1a where the electrode layer 20 is exposed (the far side of the paper in FIG. 12(B)), and an electrode 80 connected to the electrode layer 30 is formed on a surface 103 where the electrode layer 30 is exposed (the near side of the paper in FIG. 12(B)) (FIG. 9(A)). For example, the electrodes 60, 70, 80, and 90 are formed by applying a conductive paste or depositing a metal on the surface of the battery body 1a.

[0079] Through the steps described above, the solid state battery 1 is formed. [How to use solid-state batteries] Next, a method of using the solid-state battery 1 will be described.

[0080] In the solid-state battery 1, the materials of the electrode layer 10, the electrode layer 20, the electrode layer 30, and the electrode layer 40 are set in advance so that a predetermined potential difference is obtained by a combination of two selected from the electrode layer 10, the electrode layer 20, the electrode layer 30, and the electrode layer 40. For example, the materials are set in advance so that a predetermined potential difference is obtained by a combination of two selected electrode layers, such as when the electrode layer 20 is used as the positive electrode layer and the electrode layer 30 is used as the negative electrode layer, a potential difference of 3 V is obtained, and when the electrode layer 10 is used as the positive electrode layer and the electrode layer 40 is used as the negative electrode layer, a potential difference of 2 V is obtained.

[0081] This makes it possible to change the battery voltage of the solid-state battery 1 by selecting which of the electrode layers 10, 20, 30, and 40 is the positive electrode layer and which is the negative electrode layer. In other words, it is possible to achieve two or more battery voltages with one solid-state battery 1.

[0082] Which of the electrode layers 10, 20, 30, and 40 will be the positive electrode layer and which will be the negative electrode layer can be determined by selecting two electrodes from the electrodes 60, 70, 80, and 90 that will be connected to them, respectively.

[0083] Fig. 13 is a diagram for explaining an example of electrode selection, in which Fig. 13(A) to Fig. 13(C) each show a schematic plan view of the main part of an example of a solid-state battery. For example, when the electrode layer 20 is a positive electrode layer and the electrode layer 30 is a negative electrode layer, as shown in FIG. 13(A), the electrodes 70 and 80 connected to the electrode layer 20 and the electrode layer 30, respectively, are selected as the positive electrode and the negative electrode, respectively.

[0084] For example, when the electrode layer 10 is a positive electrode layer and the electrode layer 40 is a negative electrode layer, as shown in FIG. 13(B), the electrodes 60 and 90 connected to the electrode layer 10 and the electrode layer 40, respectively, are selected as the positive electrode and the negative electrode, respectively.

[0085] For example, when the electrode layer 20 is a positive electrode layer and the electrode layer 40 is a negative electrode layer, as shown in FIG. 13(C), the electrodes 70 and 90 connected to the electrode layer 20 and the electrode layer 40, respectively, are selected as the positive electrode and the negative electrode, respectively.

[0086] The combination of two electrodes selectable as the positive and negative electrodes from the electrodes 60, 70, 80, and 90 is not limited to the examples shown in FIGS. 13(A) to 13(C). In the solid-state battery 1, two electrodes are selected from the electrodes 60, 70, 80, and 90 according to the examples shown in FIGS. 13(A) to 13(C), depending on which of the electrode layers 10, 20, 30, and 40 is to be the positive electrode layer and which is to be the negative electrode layer. The battery voltage of the solid-state battery 1 is set by selecting two electrodes from the electrodes 60, 70, 80, and 90 as the positive and negative electrodes. The battery voltage of the solid-state battery 1 can be changed by changing the combination of two electrodes selected as the positive and negative electrodes from the electrodes 60, 70, 80, and 90.

[0087] In this way, in the solid-state battery 1, by changing the combination of two electrodes selected as the positive electrode and the negative electrode from the electrode 60, the electrode 70, the electrode 80, and the electrode 90, one solid-state battery 1 can be used as a solid-state battery that outputs different battery voltages. Therefore, in the solid-state battery 1, two electrodes can be selected from the electrode 60, the electrode 70, the electrode 80, and the electrode 90 based on the operating voltage of an electronic device in which the solid-state battery 1 is mounted, and the battery voltage can be set. When the solid-state battery 1 is mounted in another electronic device with a different operating voltage, a different combination of two electrodes can be selected from the electrode 60, the electrode 70, the electrode 80, and the electrode 90 based on the operating voltage, and a different battery voltage can be set.

[0088] The above-described solid state battery 1 can increase the types of electronic devices that can be installed, and improve the versatility of the solid state battery 1, compared to conventional solid state batteries that only have one battery voltage. [Modification of solid-state battery] In the above description, the solid state battery 1 having four electrodes, ie, the electrode 60, the electrode 70, the electrode 80, and the electrode 90, is taken as an example, but the number of electrodes of the solid state battery 1 is not limited to four.

[0089] Fig. 14 is a diagram illustrating a first modified example of a solid-state battery. Fig. 14(A) is a schematic perspective view of a main part of a battery body of a solid-state battery according to the first modified example, and Fig. 14(B) is a schematic perspective view of a main part of the first modified example of a solid-state battery in which electrodes are provided on the battery body.

[0090] The battery body 1Aa shown in FIG. 14(A) has a configuration in which, for example, a portion of the electrode layer 20 is exposed from the surface 105 (top surface). For example, the electrode layer 20 partially exposed from the surface 105 has a configuration in which its side end surface is not exposed from the surface 102. The battery body 1Aa differs from the battery body 1a (FIG. 1(A)) in having such a configuration. The battery body 1Aa shown in FIG. 14(A) can be obtained by alternately stacking electrode layer parts 2 and electrode layer parts 3 in the process shown in FIG. 11(A) above, stacking an electrolyte sheet 50a having an opening 50c communicating with the electrode layer 20 on the top layer, cutting the sheet, and then heat-treating the sheet. Alternatively, the battery body 1Aa can be obtained by applying and drying an embedding layer paste to the top layer so that the opening 50c communicating with the electrode layer 20 is formed, cutting the sheet, and then heat-treating the sheet.

[0091] The solid-state battery 1A shown in FIG. 14(B) has a configuration in which an electrode 100 is provided on a surface 105 of a battery body 1Aa as shown in FIG. 14(A). The solid-state battery 1A differs from the above-described solid-state battery 1 (FIG. 1(B)) in that it has such a configuration. The electrode 100 of the solid-state battery 1A is connected to an electrode layer 20 that is partially exposed from the surface 105 of the battery body 1Aa. As with the above-described solid-state battery 1, an electrode 60, an electrode 70, an electrode 80, and an electrode 90 are provided on surfaces 101, 102, 103, and 104 of the battery body 1Aa of the solid-state battery 1A, respectively. For example, the electrode layer 20 that is partially exposed from the surface 105 is configured not to be connected to the electrode 70 provided on the surface 102.

[0092] In the solid-state battery 1A, five electrodes 60, 70, 80, 90, and 100 are provided on the surface of the battery body 1Aa, and are connected to the electrode layer 10, the electrode layer 20, the electrode layer 30, and the electrode layer 40. In the solid-state battery 1A, two electrodes are selected from the electrodes 60, 70, 80, 90, and 100 depending on which of the electrode layers 10, 20, 30, and 40 is to be the positive electrode layer and which is to be the negative electrode layer. The battery voltage of the solid-state battery 1A is set by selecting two electrodes from the electrodes 60, 70, 80, 90, and 100 as the positive electrode and the negative electrode. The battery voltage of the solid-state battery 1A can be changed by changing the combination of two electrodes selected as the positive electrode and the negative electrode from the electrodes 60, 70, 80, 90, and 100.

[0093] In the solid state battery 1A, the number of electrodes 100 is increased compared to the solid state battery 1, and therefore the number of combinations of two electrodes that can be selected as the positive electrode and the negative electrode increases. This allows the solid state battery 1A to be set to a wider range of battery voltages. Therefore, a more versatile solid state battery 1A is realized.

[0094] Here, an example is shown in which five electrodes 60, 70, 80, 90, and 100 are provided on a hexahedral battery body 1Aa, but six electrodes may also be provided on a hexahedral battery body.

[0095] Fig. 15 is a diagram illustrating a second modified example of the solid state battery, which is a perspective view of a main part of the second modified example of the solid state battery in which electrodes are provided on the battery body. 15 has a battery body 1Ba in which an opening is provided on a surface 106 (bottom surface) of the battery body 1Aa shown in Figures 14(A) and 14(B) opposite to the surface 105 on which the electrode 100 is provided, exposing a part of the electrode layer 20, as on the surface 105 side, and an electrode 110 connected to the electrode layer 20 is further provided on the surface 106. For example, the electrode layer 20 partially exposed from the surface 106 is configured so that its side end surface is not exposed from the surface 102, and is not connected to the electrode 70 provided on the surface 102.

[0096] As with the solid state battery 1A, the surfaces 101, 102, 103, 104, and 105 of the battery body 1Ba of the solid state battery 1B are provided with electrodes 60, 70, 80, 90, and 100, respectively. In the solid state battery 1B, an electrode 110 is also provided on the surface 106 of the battery body 1Ba. This results in a solid state battery 1B having a total of six electrodes. The solid state battery 1B having six electrodes further increases the number of combinations of two electrodes that can be selected as the positive electrode and the negative electrode, making it possible to set an even wider range of battery voltages. Therefore, a more versatile solid state battery 1B is realized.

[0097] Here, an example has been shown in which the electrode 100 provided on the surface 105 of the battery body 1Aa or the electrode 110 provided on the surface 106 of the battery body 1Ba is connected to the electrode layer 20, but these electrodes 100 and 110 do not necessarily have to be connected to the electrode layer 20. For example, the stacking order or number of stacked layers of the electrode layer parts 2 and 3 may be changed so that they are connected to the electrode layer 30. Alternatively, the electrode layer connected to the electrode 100 provided on the surface 105 of the battery body 1Aa or the electrode 110 provided on the surface 106 of the battery body 1Ba may be an electrode layer containing a material component (e.g., an active material) different from those of the electrode layer 10, the electrode layer 20, the electrode layer 30, and the electrode layer 40.

[0098] In the above description, the solid-state battery 1 (FIG. 1(B) etc.) having four electrodes, the solid-state battery 1A (FIG. 14(B)) having five electrodes, and the solid-state battery 1B (FIG. 15) having six electrodes have been shown as examples, but it is also possible to obtain a solid-state battery having three electrodes. For example, by omitting the electrode layer 40 and the electrode 90 connected thereto in the solid-state battery 1, a solid-state battery having three electrodes, namely, the electrode 60, the electrode 70, and the electrode 80, can be obtained. In addition to the electrode layer 40 and the electrode 90, a solid-state battery having three electrodes can also be obtained by omitting any of the electrode layer 10 and the electrode 60, the electrode layer 20 and the electrode 70, or the electrode layer 30 and the electrode 80 in the solid-state battery 1.

[0099] [Electronic equipment] An electronic device is realized in which the solid-state battery 1 or the like as described above is mounted on the electronic device, and the electronic device operates with power supplied from the solid-state battery 1 or the like.

[0100] FIG. 16 is a diagram illustrating an electronic device including an electronic device equipped with a solid-state battery. 16, a solid-state battery 1 (FIG. 1(B), etc.) including four electrodes 60, 70, 80, and 90 is mounted on an electronic device 300. Here, the operating voltage of the electronic device 300 is assumed to be P.

[0101] When the solid-state battery 1 is mounted on an electronic device 300 having such an operating voltage P, two electrodes to be the positive and negative electrodes are selected from the electrodes 60, 70, 80, and 90 of the solid-state battery 1 based on the operating voltage P of the electronic device 300. That is, two electrodes capable of outputting a battery voltage that can operate the electronic device 300 having the operating voltage P are selected, in other words, two electrodes connected to two electrode layers among the electrode layer 10, electrode layer 20, electrode layer 30, and electrode layer 40 that exhibit a potential difference that allows the battery voltage to be obtained are selected.

[0102] For example, when the electrode layer 20 of the solid-state battery 1 is a positive electrode layer and the electrode layer 30 is a negative electrode layer, the potential difference between the electrode layer 20 and the electrode layer 30 is a potential difference that provides a battery voltage that can operate the electronic device 300 at an operating voltage P. If the electrode layer 20 and the electrode layer 30 are thus two electrode layers that exhibit a potential difference that provides a battery voltage that can operate the electronic device 300 at an operating voltage P, then the two electrodes 70 and 80 connected thereto are selected as the positive electrode and the negative electrode, respectively, as shown in FIG.

[0103] In this way, the solid-state battery 1, in which two predetermined electrodes from the electrode 60, the electrode 70, the electrode 80, and the electrode 90 (electrodes 70 and 80 in the example of FIG. 16) are selected as the positive electrode and the negative electrode based on the operating voltage P of the electronic device 300, is mounted on the electronic device 300, for example, after charging or after charge / discharge. Then, the selected two electrodes of the solid-state battery 1 (electrodes 70 and 80 in the example of FIG. 16) are connected to the positive electrode terminal 310 and the negative electrode terminal 320 of the electronic device 300, respectively. In this way, an electronic device 400 is realized, which includes the electronic device 300 that operates at the operating voltage P and the solid-state battery 1 that is mounted on the electronic device 300 and supplies power to it.

[0104] When the solid-state battery 1 is mounted in another electronic device with a different operating voltage, a different combination of two electrodes is selected based on the operating voltage, in which two electrode layers exhibit a potential difference that provides a corresponding battery voltage. Then, for example, after charging or charging / discharging, the solid-state battery 1 is mounted in the other electronic device, and the selected two electrodes are connected to the positive and negative terminals of the electronic device, respectively. This realizes another electronic device.

[0105] The solid-state battery 1 can achieve multiple battery voltages by changing the combination of the two electrodes selected as the positive and negative electrodes, and can be installed in multiple types of electronic devices with different operating voltages. Therefore, the solid-state battery 1 is more versatile than conventional solid-state batteries that only have one battery voltage.

[0106] Although the solid-state battery 1 has been described as an example in FIG. 16, the solid-state battery 1A, the solid-state battery 1B, and the like having other configurations can be similarly mounted in a plurality of types of electronic devices by setting or changing the combination of two electrodes selected as the positive electrode and the negative electrode based on the operating voltage of the electronic device in which the battery is mounted.

[0107] In the above description, an example has been shown in which the electrode layers 10 and 20 each have four layers, and the electrode layers 30 and 40 each have three layers, but as mentioned above, these numbers of layers are not limited. The electrode layers 10, 20, 30, and 40 can each have one layer or two or more layers. [Explanation of symbols]

[0108] 1,1A,1B solid state battery 1a, 1Aa, 1Ba battery body 2,3 Electrode layer parts 4 Laminate 4a piece 10,20,30,40 electrode layer 50 electrolyte layer 50a electrolyte sheet 50b Buried layer 50c opening 60,70,80,90,100,110 electrode 101,102,103,104,105,106 sides 200 markers 300 Electronic Devices 310 Positive terminal 320 Negative terminal 400 Electronic equipment

Claims

1. a battery body having a plurality of electrode layers and an electrolyte layer provided between the plurality of electrode layers; three or more electrodes that are separated from one another and are provided in the battery body and connected to the plurality of electrode layers; Including, Any two of the three or more electrodes can be selected as a positive electrode and a negative electrode, A solid-state battery characterized in that it is used as a battery for outputting a battery voltage indicated by the potential difference between the two selected electrodes to an electronic device connected to the two electrodes and operated at a predetermined operating voltage.

2. 2. The solid-state battery according to claim 1, wherein different combinations of the two electrodes selected exhibit different voltages.

3. 3. The solid-state battery according to claim 1, wherein one or more of the plurality of electrode layers are connected to each of the three or more electrodes.

4. The battery body has a hexahedral shape, 4. The solid-state battery according to claim 1, wherein the three or more electrodes are provided on three or more surfaces of the battery body.

5. 5. The solid-state battery according to claim 1, wherein the electrode layers connected to the selected two electrodes from among the plurality of electrode layers contain different types of active materials.

6. 5. The solid-state battery according to claim 1, wherein the electrode layers connected to the selected two electrodes from among the plurality of electrode layers contain the same type of active material.

7. a battery body having a plurality of electrode layers and an electrolyte layer provided between the plurality of electrode layers; three or more electrodes that are separated from one another and are provided in the battery body and connected to the plurality of electrode layers; Including, a solid-state battery in which any two of the three or more electrodes can be selected as a positive electrode and a negative electrode; an electronic device in which the solid-state battery having the two selected electrodes is mounted; Including, The electronic device is characterized in that the two electrodes of the solid-state battery are selected based on the operating voltage of the electronic device in which it is installed.

8. a battery body having a plurality of electrode layers and an electrolyte layer provided between the plurality of electrode layers; three or more electrodes that are separated from one another and are provided in the battery body and connected to the plurality of electrode layers; Including, preparing a solid-state battery in which any two of the three or more electrodes can be selected as a positive electrode and a negative electrode; selecting the two electrodes based on an operating voltage of an electronic device in which the solid-state battery is installed; mounting the solid-state battery with the two selected electrodes on the electronic device; A method for manufacturing an electronic device, comprising:

Images