Solid-state battery and method for manufacturing solid-state battery
By configuring insulating material at the ends of the solid-state battery stack and setting a second insulating material, the problems of stacking misalignment and stress concentration are solved, thereby improving the stability and safety of the battery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HONDA MOTOR CO LTD
- Filing Date
- 2026-01-09
- Publication Date
- 2026-07-14
AI Technical Summary
Existing solid-state batteries are prone to problems such as stacking misalignment and stress concentration caused by electrode expansion and contraction during manufacturing and use.
An insulating material is disposed at the end of the solid-state battery stack. By covering the end of the insulating material in the orthogonal direction and setting a second insulating material in a specific area, the stacking displacement is prevented and stress concentration is alleviated.
It effectively prevents the stacking of the laminates from shifting and reduces stress concentration caused by electrode expansion and contraction, thereby improving the stability and safety of solid-state batteries.
Smart Images
Figure CN122393575A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to solid-state batteries and methods for manufacturing solid-state batteries. Background Technology
[0002] In recent years, research and development on secondary batteries that contribute to energy efficiency have been ongoing, aiming to make energy affordable, reliable, and accessible to a wide range of people, while ensuring sustainable and advanced energy sources. Solid-state batteries (solid-state secondary batteries), which utilize solid-state electrolytes, have attracted significant attention as secondary batteries.
[0003] Solid-state batteries have a laminate consisting of a positive electrode layer, a solid electrolyte layer, and a negative electrode layer. Within the laminate, there may be layers that extend further outward than other layers. Techniques for protecting the sides of such laminates using a coating layer made of resin or the like are known (see, for example, Patent Document 1).
[0004] Existing technical documents
[0005] Patent documents
[0006] Patent Document 1: Japanese Patent Application Publication No. 2019-121532 Summary of the Invention
[0007] [The problem the invention aims to solve]
[0008] Patent Document 1 discloses an all-solid-state battery having a resin layer covering at least the sides of the all-solid-state battery stack. However, if the resin coating is provided on the entire side of the stack, the expansion and contraction of the negative electrode due to the charging and discharging of the solid-state battery may cause stress concentration, particularly at the two ends of the electrode layer located in the stacking direction of the electrode stack. On the other hand, during the manufacturing of solid-state batteries, for example, when transporting the stack and storing it in an outer casing, stack misalignment may occur, thus requiring measures to prevent stack misalignment of the stack.
[0009] The present invention was made in view of the above circumstances, and aims to provide a solid-state battery that can prevent the stacking of the laminates from shifting and reduce stress concentration caused by the expansion and contraction of the electrodes.
[0010] [Technical means to solve the problem]
[0011] (1) The present invention relates to a solid-state battery comprising a stacked body consisting of a positive electrode layer, a solid electrolyte layer and a negative electrode layer, wherein an insulating material is disposed at the end of the positive electrode layer orthogonal to the stacking direction, and the end of the insulating material is located further outward than the end of the negative electrode layer in a first direction orthogonal to the stacking direction, and a second insulating material is provided covering a portion of the end of the insulating material in the first direction, wherein the second insulating material covers at least a portion of each end of the entire insulating material, and the end face of the stacked body where the second insulating material is disposed has a first region as the central portion of the stacking direction and a second region as the two ends of the stacking direction, wherein in the first region, when the total length of the stacked body in the stacking direction and the second direction orthogonal to the first direction is set to 100%, the second insulating material is disposed in a region of 90% or more.
[0012] (2) According to the solid-state battery of (1), the aforementioned second insulating material is configured to be interconnected at least at any point on one end face of the aforementioned laminate.
[0013] (3) In the solid-state battery according to (1) or (2), when the total length of the aforementioned laminate in the aforementioned stacking direction is set to 100%, the length of the aforementioned first region in the aforementioned stacking direction is more than 1% and less than 98%, and when the total length of the aforementioned laminate in the aforementioned stacking direction is set to 100%, the length of the aforementioned second region in the aforementioned stacking direction is more than 1% and less than 98%, and the aforementioned second insulating material is formed in the aforementioned second region as one or more strips.
[0014] (4) In any one of (1) to (3) the solid-state battery, the aforementioned second insulating material is disposed in an area of 50% or more and 100% or less of the aforementioned first region, and is disposed in an area of 51% or more and 99% or less of the aforementioned second region.
[0015] (5) Furthermore, the present invention relates to a method for manufacturing a solid-state battery, which is a method for manufacturing a solid-state battery according to any one of (1) to (4), the method comprising: a lamination step, laminating the aforementioned positive electrode layer, the aforementioned solid electrolyte layer and the aforementioned negative electrode layer to obtain the aforementioned laminate; and a coating step, forming the aforementioned second insulating material on the end face of the aforementioned laminate in the aforementioned first direction; wherein the aforementioned coating step comprises the following steps: disposing a coating agent at the central portion of the end face of the aforementioned laminate in the aforementioned first direction; and extending the aforementioned coating agent.
[0016] (The effect of the invention)
[0017] According to the present invention, a solid-state battery can be provided that can prevent the stacking of the laminates from shifting and reduce stress concentration caused by the expansion and contraction of the electrodes. Attached Figure Description
[0018] Figure 1 This is a diagram of a solid-state battery according to a first embodiment, viewed from the side (first direction).
[0019] Figure 2 This is a diagram of a solid-state battery according to the first embodiment, viewed from the side (second direction).
[0020] Figure 3 This is a diagram of a solid-state battery according to a second embodiment, viewed from the side (first direction).
[0021] Figure 4 This is a diagram of a solid-state battery according to a third embodiment, viewed from the side (first direction).
[0022] Figure 5 A diagram showing other examples of solid-state batteries as viewed from the side (first direction).
[0023] Figure 6 A diagram showing other examples of solid-state batteries as viewed from the side (first direction).
[0024] Figure 7 This is a schematic diagram of one step of the manufacturing method of the solid-state battery of this embodiment, viewed from the side (second direction). Detailed Implementation
[0025] [First Implementation Method]
[0026] Solid-state batteries
[0027] like Figure 1 and Figure 2 As shown, the solid-state battery 1 of this embodiment has a laminate 10 composed of multiple layers, including a positive electrode layer, a solid electrolyte layer, and a negative electrode layer. Examples of solid-state batteries include lithium metal secondary batteries and lithium-ion secondary batteries, which use lithium metal as the negative electrode active material.
[0028] (Layered structure)
[0029] The laminate 10 has a laminated structure formed by stacking a positive electrode layer, a solid electrolyte layer, and a negative electrode layer in that order. Figure 2In the laminate 10, the laminate 10 has a structure formed by repeatedly stacking laminate 11 and laminate 12. Laminate 11 is configured to include a negative electrode layer and a solid electrolyte layer, and laminate 12 is configured to include a positive electrode layer. The positive electrode layer includes a positive current collector and a positive active material layer. The negative electrode layer includes a negative current collector and a negative active material layer. In addition to the above, the laminate 10 may also have, for example, an intermediate layer disposed between the electrolyte layer and the negative electrode layer. In the laminate 10, the stacking direction of each layer is the Y direction as shown in the figures.
[0030] The positive current collector 12a is configured to abut against the positive active material layer 12b, and has the function of collecting electricity from the positive active material layer 12b. The material of the positive current collector 12a is not particularly limited as long as it can collect electricity from the positive active material layer 12b. Examples of materials for the positive current collector 12a include aluminum, aluminum alloys, stainless steel, nickel, iron, and titanium, among which at least one element selected from the group consisting of aluminum, aluminum alloys, and stainless steel is preferred.
[0031] Examples of possible shapes for the positive current collector 12a include foil and plate shapes. Furthermore, the thickness of the positive current collector 12a is not particularly limited and can be the same as the thickness of the positive electrode used in ordinary solid-state batteries. For example, the thickness of the positive current collector 12a can be in the range of 0.1 μm or more and 1 mm or less.
[0032] The positive current collector 12a is roughly rectangular in shape when viewed from the stacking direction, with one side extending out and electrically connected to the positive electrode tab lead. That is, the direction in which the current collector extends ( Figure 1 The X direction in the figure is a direction orthogonal to either of the aforementioned sides of the rectangular positive current collector 12a.
[0033] The positive electrode active material layer 12b is a layer containing at least a positive electrode active material. The positive electrode active material contained in the positive electrode active material layer 12b can be any material used in the positive electrode active material layer 12b of a common secondary battery; there are no particular limitations. Examples of positive electrode active materials, for example, in lithium-ion batteries, include lithium-containing layered active materials, spinel-type active materials, olivine-type active materials, etc. Specific examples of positive electrode active materials include lithium cobalt oxide (LiCoO2), lithium nickel oxide (LiNiO2), and LiNi... p Mn q Co r O2(p+q+r=1), LiNi p Al q Co r O2(p+q+r=1), lithium manganese oxide (LiMn2O4), and Li 1+x Mn 2-x-y M yLi-Mn spinel represented by O4 (x+y=2, M is at least one selected from Al, Mg, Co, Fe, Ni and Zn), lithium titanate (an oxide containing Li and Ti), lithium metal phosphate (LiMPO4, M is at least one selected from Fe, Mn, Co and Ni), etc.
[0034] To improve lithium-ion conductivity, the positive electrode active material layer 12b may optionally contain a solid electrolyte as described later. Furthermore, the positive electrode active material layer 12b may optionally contain a binder, conductive additives, etc.
[0035] The thickness of the positive electrode active material layer 12b is not particularly limited and can be appropriately set according to the required battery performance. For example, the thickness of the positive electrode layer can be in the range of 0.1 μm or more and 1 mm or less.
[0036] An insulating material 12c is provided at the end of the positive electrode layer that is orthogonal to the stacking direction. By placing the insulating material 12c at the end of the positive electrode layer, when the negative electrode current collector tabs extending from the negative electrode current collectors 11a of each individual structure are brought together and electrically connected to the tab leads, the bending of the negative electrode current collector tabs can prevent the negative electrode current collector tabs from contacting the positive terminal, thereby suppressing short circuits. In addition, it can suppress the generation of cracks caused by volume changes due to repeated charging and discharging, and can also suppress short circuits caused by cracks.
[0037] The insulating material 12c can be placed at the end of the positive electrode layer, and its shape is not limited. The size of the insulating material 12c is also not particularly limited, as long as it abuts against part or all of the end face of the positive electrode layer.
[0038] The material used for insulating material 12c is not particularly limited as long as it exhibits insulating properties; it can be any insulator other than a semiconductor or conductor. The material for insulating material 12c can be appropriately selected based on the properties to be added, for example, insulating resins.
[0039] like Figure 2 As shown, the end of the insulating material 12c is in a direction orthogonal to the lamination direction (first direction: Figure 2 In the Z direction (as shown), it is positioned further outward than the ends of the negative electrode layer and the solid electrolyte layer.
[0040] A solid electrolyte layer is disposed between the positive electrode layer and the negative electrode layer. The solid electrolyte layer contains a solid electrolyte. As a solid electrolyte, it only needs to possess ion conductivity and insulation properties, and is not particularly limited. Examples of solid electrolytes include: sulfide solid electrolyte materials, oxide solid electrolyte materials, halide solid electrolytes, inorganic solid electrolytes such as those containing lithium salts, polymer-based solid electrolytes such as polyethylene oxide, and gel-based solid electrolytes containing lithium salts or lithium-ion conductive ionic liquids. Among these, sulfide solid electrolyte materials are preferred from the perspective of good high conductivity of lithium ions and good structural formability or interfacial bonding achieved through pressing. The solid electrolyte layer may optionally contain a binder.
[0041] The negative electrode current collector 11a is configured to contact the negative electrode active material layer and has the function of collecting electricity from the negative electrode active material layer. As for the material of the negative electrode current collector 11a, it is not particularly limited as long as it can collect electricity from the negative electrode active material layer. Examples include: metals containing at least one metallic element selected from the group consisting of silver, palladium, gold, platinum, aluminum, copper and nickel, alloys such as stainless steel, or non-metals such as carbon (C).
[0042] The shape of the negative electrode current collector 11a is not particularly limited, and examples include foil, plate, mesh, non-woven fabric, foam, etc. In addition, in order to improve the adhesion with the negative electrode layer, a carbon layer or the like can be disposed on the surface of the negative electrode current collector 11a, or its surface can be roughened.
[0043] The thickness of the negative current collector 11a is not particularly limited and can be the same as that of the negative electrode used in ordinary secondary batteries. For example, the thickness of the negative current collector 11a can be in the range of 0.1 μm or more and 1 mm or less.
[0044] The negative electrode active material layer is a layer containing negative electrode active materials that accept and accept lithium ions and electrons. The negative electrode active material contained in the negative electrode layer can be any material used in the negative electrode layer of a common secondary battery; there are no particular limitations. Examples of negative electrode active materials include: silicon-based active materials such as silicon and silicon alloys; carbon-based active materials such as graphite and hard carbon; various oxide-based active materials such as lithium titanate; and lithium-based active materials such as lithium metal and lithium alloys. One of the above materials can be used alone, or two or more can be used in combination.
[0045] To improve ionic conductivity, the negative electrode active material layer may optionally contain the aforementioned solid electrolyte. Furthermore, the negative electrode layer may optionally contain a binder or conductive additive. Materials used in conventional secondary batteries can be employed as these materials.
[0046] The thickness of the negative electrode layer is not particularly limited and can be appropriately set according to the required battery performance. For example, the thickness of the negative electrode layer can be in the range of 0.1 μm or more and 1 mm or less.
[0047] The solid-state battery 1 may have an intermediate layer. For example, when the solid-state battery 1 is a lithium metal battery that uses lithium metal or lithium alloy as the negative electrode active material, the intermediate layer may be a layer that has both electronic and ionic conductivity, and may be disposed between the solid electrolyte layer and the negative electrode layer.
[0048] (Second insulating material)
[0049] At the end of the laminate 10 in a first direction orthogonal to the stacking direction (Y direction in each figure), a second insulating material 21 and a second insulating material 22 are disposed. The first direction is preferably a direction orthogonal to both the stacking direction and the current collector extension direction (X direction in each figure) (Z direction in each figure), because this facilitates the formation of the second insulating material 21 and the second insulating material 22. The first direction can also be the current collector extension direction. The second insulating material 21 and the second insulating material 22 are configured to cover the end face of the laminate 10 in the first direction with the insulating material 12c, thus protecting the protruding end face of the insulating material 12c. Furthermore, during the manufacturing process of the solid-state battery 1, when the laminate 10 is transported, etc., it is possible to suppress stacking shift of each layer. Additionally, in Figure 1 and Figure 2 The diagram illustrates a configuration where a second insulating material 21 and a second insulating material 22 are disposed at one end in the first direction, but it is preferable that the second insulating material 21 and the second insulating material 22 are also disposed at the other end in the first direction.
[0050] The second insulating material 21 and the second insulating material 22 are insulating layers, for example, made of resin material. Figure 1 As shown, the second insulating material 21 and the second insulating material 22 are layers covering a portion of the end face of the laminate 10 in a first direction. The end face of the laminate 10 in the first direction is divided into a first region B and second regions A1 and A2. In this specification, these regions are defined as regions where the second insulating material 21 and the second insulating material 22 can be disposed, respectively. The second insulating material 21 is disposed in the first region B. The second insulating material 22 is disposed in the second regions A1 and A2. The first region B is the central portion of the end face in the lamination direction. The second regions A1 and A2 are the two ends of the end face in the lamination direction (…). Figure 1 (The upper and lower parts of the middle).
[0051] When the total length of the laminated body 10 in the lamination direction is set to 100%, the length of the first region B in the lamination direction is preferably 1% or more and 98% or less, or it may be 5% or more and 90% or less. When the total length of the laminated body 10 in the lamination direction is set to 100%, the lengths of the second region A1 and the second region A2 in the lamination direction are preferably 1% or more and 98% or less, or it may be 5% or more and 90% or less.
[0052] The second insulating material 21 and the second insulating material 22 cover at least a portion of the end of all insulating material 12c on one of the aforementioned end faces. Furthermore, the second insulating material 21 and the second insulating material 22 are preferably connected to each other at least at one location, forming a continuous structure. Therefore, since the end of all insulating material 12c is held by the second insulating material 21 and the second insulating material 22, lamination shift of the laminate 10 can be reliably suppressed.
[0053] The second insulating material 21 is interconnected with the second insulating material 22 and is formed as one or more strip-shaped layers along the general stacking direction. Compared to the case where the second insulating material 21 is formed on the entire surface of the second region A1 and the second region A2, by forming the strip-shaped second insulating material 21 in a portion of the second region A1 and the second region A2, it is possible to suppress excessive stress concentration in the second region A1 and the second region A2 during the expansion and contraction of the negative electrode during the charging and discharging of the solid-state battery 1, which could lead to the cracking of the solid electrolyte layer. The second insulating material 21 is a layer whose main purpose is to prevent the stacking of the laminate 10 from shifting during the manufacturing of the solid-state battery 1. Therefore, the second insulating material 21 needs to have strength sufficient to prevent cracking during manufacturing, but it can crack during the expansion and contraction of the negative electrode during the charging and discharging of the solid-state battery 1. The cracking of the second insulating material 21 can more effectively suppress the aforementioned stress concentration.
[0054] In this embodiment, the second insulating material 22 is a strip-shaped layer extending along the lamination direction. The width (length in the X direction) of the strip-shaped second insulating material 22 is preferably 0.1 times or more and 100 times or less, more preferably 1 times or more and 50 times or less, the thickness (length in the lamination direction) of the positive electrode layer (laminated structure 12). In this embodiment, three copies of the second insulating material 22 are formed in each of the second region A1 and the second region A2. The number of second insulating materials 22 is not particularly limited.
[0055] From the perspective of preventing lamination misalignment, the second insulating material 22 is preferably uniformly distributed to a certain extent. For example, it is preferable to form at least one from the center of one end face of the laminate 10 toward the left and right sides of the second region A1 and the second region A2.
[0056] The second insulating material 22 is preferably configured to occupy an area of 5% or more and 99% or less in both the second region A1 and the second region A2. This ensures that each electrode group and the solid electrolyte layer, among other layers, are adequately fixed. Furthermore, the area is more preferably 5% or more and 50% or less. This effectively fixes each layer while minimizing weight and cost increases.
[0057] The second insulating material 21 is primarily intended to suppress lamination shift of the laminate 10 and alleviate external stress by interconnecting with the second insulating material 22, thereby protecting the aforementioned end faces of the laminate 10. From the perspective of preventing lamination shift, the second insulating material 21 is preferably a continuously continuous layer; however, it may contain voids or air bubbles to the extent that the aforementioned stress-relieving effect is sufficiently achieved. In this embodiment, the second insulating material 21 is disposed in the central portion of the first region B, covering the upper to lower ends of the laminate 10 in the lamination direction within the first region B. Furthermore, the second insulating material 21 covers the central portion of the laminate 10 in the current collector extension direction, but does not cover the two ends. That is, since the second insulating material 21 completely covers the area near the central portion of the first region B, it is preferable to alleviate external stress.
[0058] In the first region B, when the total length of the laminate 10 in the stacking direction (Y direction) and the second direction (X direction) orthogonal to the first direction (Z direction) is set to 100%, the second insulating material 21 is disposed in more than 90% of the region. Furthermore, the second insulating material 21 is preferably disposed at least in the central portion of the first region B in the direction orthogonal to the stacking direction (X direction in each figure). This allows for a relatively uniform distribution of external stress. From the perspective of preferably obtaining the above-mentioned effect, when the current collector of one end face extends in the direction ( Figure 1 When the length in the X direction is set to 100%, the second insulating material 21 is preferably disposed at least at a position from the center of one of the aforementioned end faces to the left and right 40%.
[0059] The second insulating material 21 is preferably configured to occupy an area of 50% or more and 100% or less of the first region B. From the perspective of obtaining the above-mentioned effect, the area is more preferably 51% or more and 75% or less.
[0060] The thickness of the second insulating material 21 and the second insulating material 22 is not particularly limited, but is preferably 50 μm or more and 20 mm or less.
[0061] exist Figure 2In the illustration, the second insulating material 21 and the second insulating material 22 are configured to abut against the end of the insulating material 12c in a first direction, and not to intrude into the ends of other electrode layers (e.g., negative electrode layers) located further inward than the aforementioned end, or into the space adjacent to the laminated surface. However, the second insulating material 21 and the second insulating material 22 may also intrude into the aforementioned space.
[0062] The second insulating material 21 and the second insulating material 22 can be formed, for example, by applying a resin composition and curing it. As such a resin composition, a UV-curable type, a thermosetting type, or the like can be appropriately selected.
[0063] The laminate 10 and the second insulating materials 21 and 22 are housed within an outer casing. The outer casing is, for example, composed of a laminated film. The laminated film is a film having a metal layer and a resin layer, and the laminate 10 and the second insulating materials 21 and 22 are encased within one or more sheets of film. With the laminated film encasing the laminate 10 and the second insulating materials 21 and 22, a portion of their surfaces abut and fuse together to form a sealing portion. The sealing portion is, for example, located approximately at the center of the laminate 10 in the lamination direction.
[0064] The solid-state battery 1 may also have configurations other than those described above, such as having tab leads electrically connected to the current collector. Furthermore, multiple solid-state batteries 1 can be modularly configured into a solid-state battery module. In this case, surface pressure can be applied to the laminate 10 using restraining members such as fastening rods and cushioning material. Additionally, a cooling device for cooling the solid-state battery 1 may be provided.
[0065] <Solid-state battery manufacturing method>
[0066] The solid-state battery manufacturing method of this embodiment includes: a lamination step of laminating a positive electrode layer, a solid electrolyte layer and a negative electrode layer to obtain a laminate 10; and a coating step of forming a second insulating material on the end face of the laminate 10 in the first direction.
[0067] The lamination step includes forming an electrode layer and an electrolyte layer. The steps for forming the electrode layer and electrolyte layer are not particularly limited, and known steps can be used. Examples of methods for forming the electrode layer include: coating a slurry containing an electrode active material onto a current collector and then drying it. Examples of methods for forming the electrolyte layer include: coating a slurry containing a solid electrolyte onto a substrate and then drying it. By laminating the electrode layer and electrolyte layer obtained above, and forming an insulating material at the periphery of the positive current collector, a laminate 10 is obtained. The lamination step may also include pressing the laminate 10 to integrate it.
[0068] The coating step involves forming a second insulating material 21 and a second insulating material 22 at the ends of the laminate 10 obtained by the above-described lamination step in the first direction. In the coating step, firstly, the laminate 10 is arranged such that the first direction on the side where the second insulating material 21 and the second insulating material 22 are formed is perpendicular to the first direction. Next, a coating agent (resin composition) for forming the second insulating material is filled into a known coating apparatus such as a dispensing machine, and the coating agent is applied from the coating apparatus to the ends of the laminate 10 in the first direction.
[0069] like Figure 7 As shown, the coating step preferably includes the following steps: spraying a coating agent 20, etc., for forming the second insulating material 21 from the coating apparatus and placing it on the central portion (first region B) of the end face; and extending the placed coating agent 20 along the end face. As described above, when the total length of the laminate 10 in the second direction of the first region B is set to 100%, the second insulating material 21 only needs to cover more than 90% of the area, and does not need to completely cover the first region B. Therefore, by adopting the above steps, the coating step can be simplified. As for the specific method of extending the coating agent 20, there is no particular limitation, and it can be done along... Figure 7 Apply force in the direction of the arrow shown to stretch (spread) the coating 20, or leave the coating 20 to spread naturally.
[0070] The coating step includes the following steps: forming a second insulating material 22 before and after the step of forming the second insulating material 21. The step of forming the second insulating material 22 is not particularly limited; for example, a coating apparatus that applies a coating agent 20 to a predetermined width may be used to apply a strip of the second insulating material 22 while moving the coating apparatus or the laminate 10. At this time, the second insulating material 22 is formed in such a way that it covers at least a portion of the ends of the entire insulating material 12c and is interconnected with the second insulating material 21.
[0071] Next, solid-state batteries according to other embodiments of the present invention will be described. Hereinafter, for configurations identical to those of the first embodiment, the same reference numerals will be used in the accompanying drawings, and descriptions may sometimes be omitted.
[0072] [Second Implementation]
[0073] like Figure 3 As shown, the solid-state battery 1a of this embodiment has a second insulating material 22a. The solid-state battery 1a, except for the above-described configuration, is the same as the solid-state battery 1. In this embodiment, a portion of the second insulating material 22a is formed in a direction inclined relative to the stacking direction. Therefore, the same effects as in the first embodiment can be obtained, and more preferably, the resistance to current collector extension direction (…) can be suppressed. Figure 3 Stack offset (in the X direction).
[0074] [Third Implementation Method]
[0075] like Figure 3 As shown, the solid-state battery 1b of this embodiment has a second insulating material 21b. The solid-state battery 1b, except for the above-described configuration, is the same as the solid-state battery 1. In this embodiment, the second insulating material 21b partially has voids. As a result, the Young's modulus of the second insulating material 21b in the lamination direction decreases. Therefore, with the above configuration, the same effect as in the first embodiment can be obtained: during the expansion and contraction of the negative electrode during charging and discharging of the solid-state battery 1b, the second insulating material 21b more easily follows, thus further suppressing cracking of the solid electrolyte layer.
[0076] [Other Examples]
[0077] Figure 5 This is a diagram illustrating another example of a solid-state battery 2. (See diagram for example.) Figure 5 As shown, the solid-state battery 2 has a second insulating material 21c. The solid-state battery 2, except for the above-described configuration, is the same as the solid-state battery 1. The second insulating material 21c is not connected to the second insulating material 22 formed in the second region A2. Furthermore, a portion of the insulating material 12c is not covered by the second insulating material 21c and the second insulating material 22. In this example, the portion of the insulating material 12c that is not fixed during the handling of the laminate 10 may experience lamination shift.
[0078] Figure 6 This is a diagram illustrating another example of a solid-state battery 2a. (See diagram for example.) Figure 6 As shown, the solid-state battery 2a has a second insulating material 21d. The solid-state battery 2a, except for the above-described configuration, is the same as the solid-state battery 1. The second insulating material 21d is not connected to the second insulating material 22 formed in portions of the second region A1 and the second region A2. Furthermore, the second insulating material 21d is offset to the right of the first region B. In this case, some of the insulating material 12c may experience lamination shift, and due to the skewness caused by the stress applied to the end face of the laminate 10, the function of protecting the end face of the laminate 10 may be insufficient.
[0079] Figure Labels
[0080] 1, 1a, 1b, Solid-state batteries
[0081] 10-layer stack
[0082] 11. Layered structure
[0083] 12 Positive Electrode Layer
[0084] 12a Positive current collector
[0085] 12b Positive electrode active material layer
[0086] 12c insulator
[0087] 20 Coating Agent
[0088] 21, 21b, 21c, 22, 22a Second insulating material
[0089] Areas A1 and A2
[0090] B. First Area
[0091] X Second Direction
[0092] Y stacking direction
[0093] Z is the first direction.
Claims
1. A solid-state battery comprising a stacked body consisting of a positive electrode layer, a solid electrolyte layer, and a negative electrode layer. An insulating material is disposed at the end of the aforementioned positive electrode layer that is orthogonal to the stacking direction. In the first direction orthogonal to the aforementioned stacking direction, the end of the aforementioned insulating material is located further outward than the end of the aforementioned negative electrode layer. A second insulating material having a portion of the end in the first direction covering the aforementioned insulating material. The aforementioned second insulating material covers at least a portion of each end of the aforementioned insulating material. The end face of the aforementioned laminate containing the aforementioned second insulating material has: a first region serving as the central portion in the aforementioned lamination direction, and second regions serving as the two ends in the aforementioned lamination direction. In the aforementioned first region, when the total length of the aforementioned laminate in the aforementioned stacking direction and the second direction orthogonal to the aforementioned first direction is set to 100%, the aforementioned second insulating material is disposed in a region of 90% or more.
2. The solid-state battery according to claim 1, wherein, The aforementioned second insulating material is configured to be interconnected at least at any point on one end face of the aforementioned laminate.
3. The solid-state battery according to claim 1 or 2, wherein, When the total length of the aforementioned laminated body in the aforementioned lamination direction is set to 100%, the length of the aforementioned first region in the aforementioned lamination direction is more than 1% and less than 98%. When the total length of the aforementioned laminated body in the aforementioned lamination direction is set to 100%, the length of the aforementioned second region in the aforementioned lamination direction is more than 1% and less than 98%. The aforementioned second insulating material is formed in one or more strips in the aforementioned second region.
4. The solid-state battery according to claim 1 or 2, wherein, The aforementioned second insulating material is disposed in an area of 50% or more and 100% or less of the aforementioned first region, and in an area of 51% or more and 99% or less of the aforementioned second region.
5. A method for manufacturing a solid-state battery, as described in claim 1, comprising: The lamination step involves laminating the aforementioned positive electrode layer, the aforementioned solid electrolyte layer, and the aforementioned negative electrode layer to obtain the aforementioned laminated body; as well as, In the coating step, the aforementioned second insulating material is formed on the end face of the aforementioned laminate in the aforementioned first direction; The aforementioned coating step includes the following steps: applying a coating agent to the central portion of the end face of the aforementioned laminate in the aforementioned first direction; and extending the aforementioned coating agent.