JP2012226862A - Monopolar solid state battery, laminate solid state battery, and mobile entity - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monopolar solid state battery which prevents short-circuiting by side current collectors.SOLUTION: A monopolar solid state battery is provided to achieve the above objective, which includes a cathode active material layer, a surface cathode current collector, an anode active material layer, a surface anode current collector, and a solid electrolyte layer. At least one side of the surface cathode current collector and the surface anode current collector is connected to side current collectors disposed in a lamination direction, characterized in that the side current collectors extend way up to the counter electrode sides across the solid electrolyte layer and are isolated from the counter electrodes by spaces formed between themselves and the counter electrodes, and that the side current collectors come in indented form.

Description

  The present invention relates to a monopolar solid battery that prevents a short circuit caused by a side current collector.

  With the rapid spread of information-related equipment and communication equipment such as personal computers, video cameras, and mobile phones in recent years, development of batteries that are used as power sources has been regarded as important. Also in the automobile industry and the like, development of high-power and high-capacity batteries for electric vehicles or hybrid vehicles is being promoted. Currently, lithium batteries are attracting attention among various batteries from the viewpoint of high energy density.

  Since lithium batteries currently on the market use an electrolyte containing a flammable organic solvent, it is possible to install safety devices that suppress the temperature rise during short circuits and to improve the structure and materials to prevent short circuits. Necessary. On the other hand, a lithium solid state battery in which the electrolyte solution is changed to a solid electrolyte layer to solidify the battery does not use a flammable organic solvent in the battery, so the safety device can be simplified, and the manufacturing cost and productivity can be simplified. It is considered excellent.

  A solid battery generally includes a positive electrode active material layer, a positive electrode current collector formed on the positive electrode active material layer, a negative electrode active material layer, and a negative electrode current collector formed on the negative electrode active material layer. And a solid electrolyte layer formed between the positive electrode active material layer and the negative electrode active material layer. For example, when the positive electrode current collector comes into contact with the negative electrode (negative electrode active material layer, negative electrode current collector), a short circuit occurs, and thus a device for preventing the short circuit is necessary. In FIG. 8 of Patent Document 1, in a monopolar solid battery, a short circuit is prevented by providing spaces on both side surfaces of the unit cell layer 19. In FIG. 9 of Patent Document 1, a short circuit is prevented by providing a seal portion 31 in the bipolar solid state battery.

  Further, Patent Document 2 discloses that a current collector is subjected to surface roughening to form a concavo-convex shape on a bipolar electrode current collector. Patent Document 3 discloses an active material layer including an active material layer substrate having a recess for holding an active material.

JP 2010-212092 A JP 2010-257893 A JP 2009-283451 A

  From the viewpoint of increasing the energy density, it is desirable to arrange the members constituting the battery as densely as possible. Therefore, development of a battery in which a current collector formed on an active material layer and a side current collector arranged in the stacking direction of the batteries is electrically connected is progressing. By using the side current collector, for example, when monopolar solid batteries are stacked and arranged, current collection on the side surface is facilitated. Furthermore, by disposing the side current collector in the stacking direction, unnecessary space can be reduced compared to the case where the side current collector is disposed obliquely.

  As described above, a battery having a side current collector has an advantage that it is easy to achieve high energy density, but on the other hand, the side current collector bends due to poor assembly, vibration, or the like. There may be a case where a short circuit occurs due to contact of the counter electrode (negative electrode) (for example, the side positive electrode current collector). This invention is made | formed in view of the said situation, and it aims at providing the monopolar type | mold solid battery which prevented the short circuit by a side surface electrical power collector.

  In order to achieve the above object, in the present invention, a positive electrode active material layer, a surface positive electrode current collector formed on the positive electrode active material layer, a negative electrode active material layer, and a negative electrode active material layer are formed. Monopolar solid battery having the surface negative electrode current collector and the positive electrode active material layer and the solid electrolyte layer formed between the negative electrode active material layer, the surface positive electrode current collector and the surface negative electrode At least one of the current collectors is connected to a side current collector arranged in the stacking direction, the side current collector exists beyond the solid electrolyte layer to the counter electrode side, and between the counter electrode Provided is a monopolar solid battery which is insulated from the counter electrode by a formed space, and the side current collector has an uneven shape.

  According to the present invention, since the side surface current collector has a concavo-convex shape, the strength against a force in a direction orthogonal to the stacking direction can be improved as compared with a flat plate current collector not having a concavo-convex shape. As a result, even if the side current collector is bent due to poor assembly or vibration, the side current collector (for example, the side positive current collector) can be prevented from coming into contact with the counter electrode (negative electrode) to cause a short circuit.

  In the said invention, it is preferable that the uneven | corrugated shape of the said side surface collector is a shape formed when the flat collector is bent. This is because such a concavo-convex shape can be easily created by, for example, pressing a flat plate current collector, and the strength against a force in a direction orthogonal to the stacking direction can be easily improved.

  In the said invention, it is preferable that the uneven | corrugated shape of the said side surface collector is a shape formed by arrange | positioning a reinforcing material on the surface of a flat collector. This is because such a concavo-convex shape can be easily created, for example, by sticking a reinforcing material to a flat plate current collector, and the strength against a force in a direction perpendicular to the stacking direction can be easily improved.

  In the said invention, it is preferable that the uneven | corrugated shaped convex part of the said side surface collector is formed along the said lamination direction.

  Further, in the present invention, a stacked solid battery in which two or more of the above-described monopolar solid batteries are stacked, and the adjacent monopolar solid batteries share the surface positive electrode current collector or the surface negative electrode current collector. And the laminated monopolar solid battery shares the side current collector, and the laminated solid battery is provided.

  According to the present invention, by using the above-described monopolar solid battery, the side current collector (for example, the side cathode current collector) is counter electrode (for example, the side cathode current collector) even if the side current collector is bent due to poor assembly or vibration. It is possible to prevent a short circuit from occurring due to contact with the negative electrode.

  Moreover, in this invention, the mobile body characterized by having the monopolar solid battery mentioned above or the laminated solid battery mentioned above is provided.

  According to the present invention, since the monopolar solid battery or the stacked solid battery described above is included, it is possible to provide a moving body that prevents a short circuit due to repeated starting and stopping.

  The monopolar solid battery of the present invention has an effect that a short circuit due to a side current collector can be prevented.

It is a schematic diagram which shows an example of the monopolar type solid battery of this invention. It is a schematic diagram which shows an example of a monopolar type | mold solid battery in case a side surface electrical power collector is a flat collector. It is a schematic plan view which illustrates the shape of the side current collector in the present invention. It is a schematic perspective view which shows the other example of the monopolar type | mold solid battery of this invention. It is a schematic plan view which illustrates the uneven | corrugated shape in this invention. It is a schematic plan view which illustrates the uneven | corrugated shape in this invention. It is a schematic sectional drawing which illustrates the monopolar type solid battery of the present invention. It is a schematic sectional drawing which shows an example of the laminated type solid battery of this invention.

  Hereinafter, the monopolar solid battery, the stacked solid battery, and the moving body of the present invention will be described in detail.

A. First, the monopolar solid battery of the present invention will be described. The monopolar solid battery of the present invention includes a positive electrode active material layer, a surface positive electrode current collector formed on the positive electrode active material layer, a negative electrode active material layer, and a surface negative electrode formed on the negative electrode active material layer. A monopolar solid battery having a current collector and a solid electrolyte layer formed between the positive electrode active material layer and the negative electrode active material layer, wherein the surface positive electrode current collector and the surface negative electrode current collector At least one is connected to a side current collector arranged in the stacking direction, the side current collector is present beyond the solid electrolyte layer to the counter electrode side, and a space formed between the counter electrode Thus, the side current collector is insulated from the counter electrode and has a concavo-convex shape.

  FIG. 1A is a schematic perspective view showing an example of the monopolar solid battery of the present invention, and FIG. 1B is a schematic cross-sectional view showing an example of the monopolar solid battery of the present invention. A monopolar solid battery 10 shown in FIGS. 1A and 1B includes a positive electrode active material layer 1, a surface positive electrode current collector 2 formed on the positive electrode active material layer 1, and a negative electrode active material layer 3. And a surface negative electrode current collector 4 formed on the negative electrode active material layer 3 and a solid electrolyte layer 5 formed between the positive electrode active material layer 1 and the negative electrode active material layer 3.

The surface positive electrode current collector 2 is electrically connected to the side surface positive electrode current collector 6a arranged in the battery stacking direction. The side positive electrode current collector 6a exists beyond the solid electrolyte layer 5 to the counter electrode (negative electrode) side, and is formed between the negative electrode (the negative electrode active material layer 3 and the surface negative electrode current collector 4). ₁ is insulated from the negative electrode. On the other hand, the surface negative electrode current collector 4 is electrically connected to the side surface negative electrode current collector 6b arranged in the stacking direction of the battery. The side negative electrode current collector 6b exists beyond the solid electrolyte layer 5 to the counter electrode (positive electrode) side, and is formed between the positive electrode (positive electrode active material layer 1, surface positive electrode current collector 2). ₂ is insulated from the positive electrode. In the monopolar type solid battery 10, the side positive electrode current collector 6a and the side negative electrode current collector 6b each have an uneven shape. As a result, the strength against the force 11 in the direction perpendicular to the stacking direction is improved as compared with a flat plate current collector that does not have an uneven shape.

  According to the present invention, since the side surface current collector has a concavo-convex shape, the strength against a force in a direction orthogonal to the stacking direction can be improved as compared with a flat plate current collector not having a concavo-convex shape. As a result, even if the side current collector is bent due to poor assembly or vibration, the side current collector (for example, the side positive current collector) can be prevented from coming into contact with the counter electrode (negative electrode) to cause a short circuit. For example, as shown in FIG. 2A, when the side current collector 6 is a flat plate current collector that does not have an uneven shape, the strength against a force in a direction orthogonal to the stacking direction is low. Therefore, as shown in FIG. 2B, when the force 11 in the direction orthogonal to the stacking direction is applied due to improper assembly or vibration, and the side current collector 6 bends, the side current collector 6 becomes counter electrode ( Contact with the positive electrode active material layer 1 and the surface positive electrode current collector 2) causes a short circuit. On the other hand, in the present invention, since the side surface current collector has a concavo-convex shape, the strength against a force in a direction orthogonal to the stacking direction is improved, and a short circuit can be prevented.

  Further, according to the present invention, by arranging the side current collectors in the stacking direction, the members constituting the battery can be arranged as densely as possible, and the energy density of the battery can be increased. Furthermore, in the present invention, a space is provided between the side current collector (for example, the side positive electrode current collector) and the counter electrode (negative electrode) to insulate both, but compared to the case of insulating using an insulating member. Thus, the number of parts can be reduced, and the cost can be reduced and the yield can be improved.

  Hereinafter, the monopolar solid battery of the present invention will be described separately for the configuration of the monopolar solid battery and the members of the monopolar solid battery.

1. Configuration of Monopolar Solid Battery The monopolar solid battery of the present invention has a side current collector disposed in the battery stacking direction. The battery stacking direction includes not only a strict direction (vertical direction) in which the battery members are stacked, but also a direction inclined within a range of ± 10 ° with respect to the direction.

  At least one of the surface positive electrode current collector and the surface negative electrode current collector is connected to the side surface current collector. That is, the surface positive electrode current collector may be connected to the side surface negative electrode current collector, and the surface negative electrode current collector may not be connected to the side surface negative electrode current collector. The surface positive electrode current collector may be connected to the side positive electrode current collector, and the surface positive electrode current collector and the surface negative electrode current collector may be connected to the side positive electrode current collector and the side negative electrode current collector, respectively. It may be connected. The surface current collector and the side current collector are preferably connected using, for example, a conductive adhesive.

The side current collector in the present invention exists beyond the solid electrolyte layer to the counter electrode side and is insulated from the counter electrode by a space formed between the counter electrode. Here, the clearance between the side current collector and the end portion of the counter electrode and the W _1. Note that the end portion of the counter electrode refers to an end portion of a member closer to the side surface current collector among the current collector and the active material layer. On the other hand, the width of the active material layer of the counter electrode and W _2. For example, as shown in FIG. 1 (b), and side positive electrode current collector 6a, a counter electrode (negative electrode active material layer 3, the surface anode current collector 4) the clearance between the end portion of the W _1, the anode active material layer 3 Is W ₂ . W ₁ is preferably in the range of 2% to 20% and more preferably in the range of 5% to 10% with respect to W ₂ . In addition, the degree of bending that occurs in the side current collector varies depending on the material and thickness of the side current collector, but considering this deflection, the value of W ₁ is preferably 0.1 mm or more. More preferably, it is 1.0 mm or more.

  Moreover, as a material of the side surface collector in this invention, gold | metal | money, silver, palladium, copper, nickel, iron, SUS, aluminum, titanium, carbon etc. can be mentioned, for example, Gold is preferable. This is because it is hardly affected by the oxidation-reduction reaction. The side current collector is preferably formed using, for example, a flat plate current collector. The side current collector has an uneven shape. The concavo-convex shape of the side current collector is not particularly limited as long as the shape can improve the strength against the force in the direction orthogonal to the stacking direction as compared with the flat plate current collector having no concavo-convex shape. Absent.

  As an example of the uneven shape of the side current collector, as shown in FIG. 1A, a shape formed by bending the flat plate current collector (hereinafter, sometimes referred to as a first uneven shape) Can be mentioned. The first concavo-convex shape can be easily created by, for example, pressing a flat plate current collector, and the strength against a force in a direction orthogonal to the stacking direction can be easily improved. Examples of the first uneven shape include a shape in which rectangular convex portions and concave portions are alternately formed (FIG. 3A), and a shape in which triangular convex portions and concave portions are alternately formed (FIG. 3B). ), A shape in which curved convex portions and concave portions are alternately formed (FIG. 3C), and the like.

  Especially, it is preferable that a 1st uneven | corrugated shape is a shape which can be surface-contacted with a surface electrical power collector, and the shape like FIG. 3 (a) is specifically preferable. This is because current can be collected more efficiently. For example, as shown in FIG. 3A, the length of the portion where the side current collector 6 is in continuous surface contact with the surface current collector (not shown) is L, and the uneven shape of the side current collector 6 is When the included width is W and the thickness of the side current collector 6 (thickness of the flat plate current collector itself) is T, the value of L is preferably 1 mm or more, for example, 1 mm to 5 mm. More preferably within the range. The value of W is preferably in the range of 1 mm to 5 mm, for example, and more preferably in the range of 1 mm to 2 mm. The value of T is preferably in the range of 1 μm to 1000 μm, for example, and more preferably in the range of 10 μm to 50 μm.

  As another example of the uneven shape of the side current collector, as shown in FIG. 4, a shape formed by disposing the reinforcing material 8 on the surface of the flat plate current collector 7 (hereinafter, the second uneven shape). May be referred to). The second concavo-convex shape can be easily created, for example, by sticking a reinforcing material to a flat plate current collector, and the strength against a force in a direction orthogonal to the stacking direction can be easily improved. Examples of the reinforcing material include metals, resins, and inorganic materials.

  In addition, the direction in which the uneven shape of the side surface current collector is formed is a direction that can improve the strength against the force in the direction perpendicular to the stacking direction as compared with the flat plate current collector having no uneven shape. There is no particular limitation. Here, FIGS. 5 and 6 are schematic plan views illustrating the first uneven shape and the second uneven shape, respectively. As shown in FIGS. 5A and 6A, it is preferable that the concavo-convex convex portions of the side current collector 6 are formed along the stacking direction. This is because the strength against a force in a direction orthogonal to the stacking direction can be further improved. Here, “formed along the stacking direction” means not only when the battery members are formed in a strict direction (vertical direction) but also ± 10 ° with respect to the direction. The case where it is formed in a tilted direction within the range is also included. On the other hand, as shown in FIG. 5B and FIG. 6B, the concavo-convex convex portion of the side current collector 6 has a predetermined angle (an angle greater than ± 10 °) with respect to the stacking direction. It may be formed. Moreover, as shown in FIG.6 (c), the reinforcing material 8 may be formed in mesh shape.

  In the present invention, as shown in FIG. 7A, the active material layer (for example, the positive electrode active material layer 1) has a space between the side surface current collector (for example, the side surface positive electrode current collector 6a). As shown in FIG. 7B, the active material layer (for example, the positive electrode active material layer 1) is formed so as to be in contact with the side surface current collector (for example, the side surface positive electrode current collector 6a). The latter is more preferable. This is because the space between the active material layer and the side current collector can achieve higher energy density. Furthermore, in this case, the side surface current collector has an advantage that current can be collected directly from the active material layer. Further, as shown in FIG. 7C, between the active material layer (for example, the positive electrode active material layer 1) and the side surface current collector (for example, the side surface positive electrode current collector 6a), and the surface current collector (for example, the surface) The adhesive layer 9 is preferably formed on at least one of the positive electrode current collector 2) and the side surface current collector (for example, the side surface positive electrode current collector 6a). This is because misalignment and assembly failure can be suppressed. The adhesive layer 9 is preferably formed using a conductive adhesive. Examples of the conductive adhesive include those containing metal fine particles and an adhesive resin. Examples of the adhesive resin include an epoxy resin and a silicon resin.

2. Next, members of the monopolar solid battery of the present invention will be described. The monopolar solid battery of the present invention has at least a side current collector, a positive electrode active material layer, a surface positive electrode current collector, a negative electrode active material layer, a surface negative electrode current collector, and a solid electrolyte layer.

(1) Side current collector The material, thickness, and the like of the side current collector are the same as those described above, and are not described here.

(2) Positive electrode active material layer The positive electrode active material layer in the present invention is a layer containing at least a positive electrode active material. The positive electrode active material layer may contain at least one of a conductive material, a binder, and a solid electrolyte material in addition to the positive electrode active material.

The positive electrode active material in the present invention is not particularly limited, and a general positive electrode active material can be used. As such a positive electrode active material, for example, when the monopolar solid battery of the present invention is a lithium solid battery, LiCoO ₂ , LiNiO ₂ , LiCo _1/3 Ni _1/3 Mn _1/3 O ₂ , LiVO ₂ , LiCrO layered positive electrode active material _{2 such, LiMn 2 O 4, Li (} Ni 0.25 Mn 0.75) 2 O 4, LiCoMnO 4, Li 2 NiMn 3 spinel positive electrode active material such O _8, LiCoPO _4, LiMnPO 4 An olivine-type positive electrode active material such as LiFePO ₄ , a NASICON-type positive electrode active material such as Li ₃ V ₂ P ₃ O _{12, and the} like.

The shape of the positive electrode active material is preferably particulate, for example. The average particle diameter (D ₅₀ ) of the positive electrode active material is, for example, preferably in the range of 1 nm to 100 μm, and more preferably in the range of 10 nm to 30 μm. The content of the positive electrode active material in the positive electrode active material layer is preferably higher from the viewpoint of capacity, for example, in the range of 60 wt% to 99 wt%, particularly in the range of 70 wt% to 95 wt%. Is preferred.

  The material for the conductive material is not particularly limited as long as it has desired electronic conductivity, and examples thereof include a carbon material. Furthermore, specific examples of the carbon material include acetylene black, ketjen black, carbon black, coke, carbon fiber, and graphite. The material of the binder is not particularly limited as long as it is chemically and electrically stable. For example, fluorine-based materials such as polyvinylidene fluoride (PVDF) and polytetrafluoroethylene (PTFE) are used. Examples thereof include a binder and a rubber-based binder such as styrene butadiene rubber. The solid electrolyte material will be described later in “(6) Solid electrolyte layer”.

  The thickness of the positive electrode active material layer varies greatly depending on the configuration of the battery. For example, the thickness is preferably in the range of 0.1 μm to 1000 μm, and more preferably in the range of 10 μm to 50 μm.

(3) Surface positive electrode current collector The surface positive electrode current collector in the present invention is formed on the surface of the positive electrode active material layer on the side opposite to the solid electrolyte layer. The material for the surface positive electrode current collector is not particularly limited as long as it has electronic conductivity, and examples thereof include SUS, aluminum, nickel, iron, titanium, and carbon.

(4) Negative electrode active material layer The negative electrode active material layer in the present invention is a layer containing at least a negative electrode active material. The negative electrode active material layer may contain at least one of a conductive material, a binder, and a solid electrolyte material in addition to the negative electrode active material.

  Examples of the negative electrode active material in the present invention include a metal active material and a carbon active material. Examples of the metal active material include In, Al, Si, and Sn. On the other hand, examples of the carbon active material include graphite such as mesocarbon microbeads (MCMB) and highly oriented graphite (HOPG), and amorphous carbon such as hard carbon and soft carbon.

The shape of the negative electrode active material is preferably particulate, for example. The average particle diameter (D ₅₀ ) of the negative electrode active material is, for example, preferably in the range of 1 nm to 100 μm, and more preferably in the range of 10 nm to 30 μm. The content of the negative electrode active material in the negative electrode active material layer is preferably larger from the viewpoint of capacity, for example, in the range of 60 wt% to 99 wt%, particularly in the range of 70 wt% to 95 wt%. Is preferred. In addition, since it is the same as that of the content described in the positive electrode active material layer mentioned above about a electrically conductive material, a binder, and a solid electrolyte material, description here is abbreviate | omitted.

  The thickness of the negative electrode active material layer varies greatly depending on the configuration of the battery. For example, the thickness is preferably in the range of 0.1 μm to 1000 μm, and more preferably in the range of 10 μm to 50 μm.

(5) Surface negative electrode current collector The surface negative electrode current collector in the present invention is formed on the surface of the negative electrode active material layer on the side opposite to the solid electrolyte layer. The material for the surface negative electrode current collector is not particularly limited as long as it has electronic conductivity, and examples thereof include SUS, copper, nickel, and carbon.

(6) Solid electrolyte layer The solid electrolyte layer in the present invention is a layer containing a solid electrolyte material. Examples of the solid electrolyte material include a sulfide solid electrolyte material and an oxide solid electrolyte material. The sulfide solid electrolyte material is preferable in that it has a higher ion conductivity than the oxide solid electrolyte material, and the oxide solid electrolyte material has higher chemical stability than the sulfide solid electrolyte material. This is preferable.

Examples of the oxide solid electrolyte material used for the lithium solid state battery include a compound having a NASICON type structure. As an example of a compound having a NASICON type structure, a compound represented by the general formula Li _{1 + x} Al _x Ge _2-x (PO ₄ ) ₃ (0 ≦ x ≦ 2) can be given. In the above general formula, the range of x may be 0 or more, more preferably greater than 0, and more preferably 0.3 or more. On the other hand, the range of x should just be 2 or less, and it is preferable that it is 1.7 or less especially, and it is more preferable that it is 1 or less. Among these, in the present invention, the solid electrolyte material is _preferably Li _1.5 Al _0.5 Ge _1.5 (PO ₄ ) ₃ . Another example of the compound having a NASICON structure is a compound represented by the general formula Li _{1 + x} Al _x Ti _2-x (PO ₄ ) ₃ (0 ≦ x ≦ 2). In the above general formula, the range of x may be 0 or more, more preferably greater than 0, and more preferably 0.3 or more. On the other hand, the range of x should just be 2 or less, and it is preferable that it is 1.7 or less especially, and it is more preferable that it is 1 or less. Among these, in the present invention, the solid electrolyte material is _preferably Li _1.5 Al _0.5 Ti _1.5 (PO ₄ ) ₃ . Other examples of the oxide solid electrolyte material include LiLaTiO (for example, Li _0.34 La _0.51 TiO ₃ ), LiPON (for example, Li _2.9 PO _3.3 N _0.46 ), LiLaZrO ( for _example, mention may be made of _{Li 7 La 3 Zr 2 O 12} ) or the like.

Examples of the sulfide solid electrolyte material used in the lithium solid state battery include Li ₂ S—P ₂ S ₅ , Li ₂ S—P ₂ S ₅ —LiI, Li ₂ S—P ₂ S ₅ —Li ₂ O, Li _{2 S-P 2 S 5 -Li} 2 O-LiI, Li 2 S-SiS 2, Li 2 S-SiS 2 -LiI, Li 2 S-SiS 2 -LiBr, Li 2 S-SiS 2 -LiCl, Li 2 _{S-SiS 2 -B 2 S 3} -LiI, Li 2 S-SiS 2 -P 2 S 5 -LiI, Li 2 S-B 2 S 3, Li 2 S-P 2 S 5 -Z m S n ( provided that , M, and n are positive numbers. Z is any of Ge, Zn, and Ga.), Li ₂ S—GeS ₂ , Li ₂ S—SiS ₂ —Li ₃ PO ₄ , Li ₂ S—SiS ₂ —Li _x MO _y (where, x, y is the number of positive .M is, P, S , Mention may be made of Ge, B, Al, Ga, any of an In.) And the like. The description of “Li ₂ S—P ₂ S ₅ ” means a sulfide solid electrolyte material using a raw material composition containing Li ₂ S and P ₂ S _5, and the same applies to other descriptions. is there.

The shape of the solid electrolyte material is preferably particulate, for example. The average particle diameter (D ₅₀ ) of the solid electrolyte material is, for example, preferably in the range of 1 nm to 100 μm, and more preferably in the range of 10 nm to 30 μm. The content of the solid electrolyte material in the solid electrolyte layer is, for example, preferably 60% by weight or more, more preferably 70% by weight or more, and particularly preferably 80% by weight or more. The solid electrolyte layer may contain a binder or may be composed only of a solid electrolyte material.

  The thickness of the solid electrolyte layer varies greatly depending on the configuration of the battery. For example, the thickness of the solid electrolyte layer may be within a range of 0.1 μm to 1000 μm, particularly within a range of 0.1 μm to 300 μm, and particularly within a range of 10 μm to 30 μm. preferable.

(7) Monopolar Solid Battery As examples of the monopolar solid battery of the present invention, a lithium solid battery, a sodium solid battery, a magnesium solid battery, a calcium solid battery, and the like can be given. Among these, a lithium solid battery is preferable. Furthermore, the monopolar solid battery of the present invention may be a primary battery or a secondary battery, and among these, a secondary battery is preferable. This is because it can be repeatedly charged and discharged and is useful, for example, as a vehicle battery. Moreover, the manufacturing method of a monopolar type solid battery is not specifically limited, It is the same as the manufacturing method in a general battery.

B. Next, the stacked solid battery of the present invention will be described. The laminated solid battery of the present invention is a laminated solid battery in which two or more of the above-described monopolar solid batteries are laminated, and the adjacent monopolar solid batteries are the surface positive electrode current collector or the surface negative electrode current collector. The monopolar solid batteries stacked and shared share the side current collector.

  FIG. 8 is a schematic cross-sectional view showing an example of the stacked solid battery of the present invention. The stacked solid battery 20 shown in FIG. 8 is a battery in which two or more monopolar solid batteries 10 are stacked, and the adjacent monopolar solid battery 10 is connected to the surface positive electrode current collector 2 or the surface negative electrode current collector 4. The shared and stacked monopolar solid battery 10 shares the side current collectors 6a and 6b.

  According to the present invention, by using the above-described monopolar solid battery, the side current collector (for example, the side cathode current collector) is counter electrode (for example, the side cathode current collector) even if the side current collector is bent due to poor assembly or vibration. It is possible to prevent a short circuit from occurring due to contact with the negative electrode. The number of monopolar solid batteries to be stacked is not particularly limited, but is, for example, in the range of 2 to 1000, and preferably in the range of 10 to 1000.

C. Next, the moving body of the present invention will be described. The moving body of the present invention is characterized by having the above-described monopolar solid battery or the above-described stacked solid battery.

  According to the present invention, since the monopolar solid battery or the stacked solid battery described above is included, it is possible to provide a moving body that prevents a short circuit due to repeated starting and stopping. In addition, for example, when using a flat plate current collector, it is necessary to increase the thickness of the flat plate current collector in order to achieve the same strength as the uneven side current collector. There is a problem that is difficult. On the other hand, since the mobile body of the present invention uses a monopolar solid battery using a concavo-convex side current collector, the weight can be reduced and the fuel efficiency of the mobile body can be improved. it can.

  The mobile body of the present invention is not particularly limited as long as it has the above-described monopolar solid battery or stacked solid battery and is movable, and examples thereof include vehicles. Examples of the vehicle include four-wheeled vehicles such as hybrid vehicles and electric vehicles, and two-wheeled vehicles such as motorcycles.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

DESCRIPTION OF SYMBOLS 1 ... Positive electrode active material layer 2 ... Surface positive electrode current collector 3 ... Negative electrode active material layer 4 ... Surface negative electrode current collector 5 ... Solid electrolyte layer 6 ... Side surface current collector 6a ... Side surface positive electrode current collector 6b ... Side surface negative electrode current collector Body 7 ... Flat current collector 8 ... Reinforcing material 9 ... Adhesive layer 10 ... Monopolar solid battery 20 ... Stacked solid battery

Claims (6)

A positive electrode active material layer, a surface positive electrode current collector formed on the positive electrode active material layer, a negative electrode active material layer, a surface negative electrode current collector formed on the negative electrode active material layer, and the positive electrode active material A monopolar solid battery having a layer and a solid electrolyte layer formed between the negative electrode active material layer,
At least one of the surface positive electrode current collector and the surface negative electrode current collector is connected to a side surface current collector disposed in the stacking direction,
The side current collector exists beyond the solid electrolyte layer to the counter electrode side, and is insulated from the counter electrode by a space formed between the counter electrode,
The monopolar solid battery, wherein the side current collector has an uneven shape.   2. The monopolar solid battery according to claim 1, wherein the uneven shape of the side surface current collector is a shape formed by bending a flat plate current collector. 3.   2. The monopolar solid battery according to claim 1, wherein the uneven shape of the side surface current collector is a shape formed by disposing a reinforcing material on a surface of the flat plate current collector.   The monopolar solid battery according to any one of claims 1 to 3, wherein the concavo-convex convex portion of the side current collector is formed along the stacking direction. A stacked solid battery in which two or more monopolar solid batteries according to any one of claims 1 to 4 are stacked,
The adjacent monopolar solid batteries share the surface positive electrode current collector or the surface negative electrode current collector,
The laminated solid battery, wherein the laminated monopolar solid battery shares the side current collector.   A moving body comprising the monopolar solid battery according to any one of claims 1 to 4 or the stacked solid battery according to claim 5.

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