JPWO2020075512A1 - Thread battery - Google Patents

Abstract

The thread battery of the present invention is a thread battery having a first end portion and a second end portion facing each other in the longitudinal direction, and from the first end portion to the second end portion, the first end portion is reached. A first current collector to be arranged, a filamentous first electrode extending in the longitudinal direction, a filamentous solid electrolyte extending in the longitudinal direction, a filamentous second electrode extending in the longitudinal direction, and a second electrode arranged at the second end portion. 2 The current collectors are connected in this order.

Description

The present invention relates to a thread battery.

In recent years, as electronic devices have become smaller and thinner, there has been a demand for a battery having a shape that easily follows the shape of a storage space as a battery as a power source.
Examples of the shape that easily follows the shape of the storage space include a thread-type battery as described in Patent Document 1. Patent Document 1 describes an internal electrode composed of an internal current collector and a negative electrode material coated on the peripheral surface of the internal current collector, an electrolyte installed outside the internal electrode, and a peripheral surface of the electrolyte. Further, a thread-type battery that can be deformed into various shapes is disclosed, which comprises a positive electrode material, an external current collector provided on the peripheral surface of the positive electrode material, and a protective coating portion.

Japanese Patent No. 4971139

However, Patent Document 1 does not disclose any specific method for drawing a current from a thread-type battery to the outside. Since the required voltage differs for each electronic device, a plurality of batteries mounted on the electronic device are usually used in combination so as to have an appropriate voltage. However, in the thread-type battery described in Patent Document 1, not only a method of drawing a current to the outside but also a method of connecting the batteries to each other is unknown. Therefore, there is a problem that the voltage design when a plurality of batteries are used in combination cannot be freely performed.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a threaded battery which can easily draw a current to the outside and has a high degree of freedom in voltage design.

The thread battery of the present invention is a thread battery having a first end portion and a second end portion facing each other in the longitudinal direction, and from the first end portion to the second end portion, the first end portion is reached. A first current collector to be arranged, a filamentous first electrode extending in the longitudinal direction, a filamentous solid electrolyte extending in the longitudinal direction, a filamentous second electrode extending in the longitudinal direction, and a second electrode arranged at the second end portion. 2 The current collectors are connected in this order.

According to the present invention, it is possible to provide a thread battery which can easily draw a current to the outside and has a high degree of freedom in voltage design.

FIG. 1 is a perspective view schematically showing an example of the thread battery of the present invention. 2 (a) to 2 (c) are perspective views showing an example of a method of joining the first electrode and the solid electrolyte. FIG. 3 is a perspective view schematically showing an example of a thread battery provided with an insulating film.

Hereinafter, the thread battery of the present invention will be described.
However, the present invention is not limited to the following embodiments, and can be appropriately modified and applied without changing the gist of the present invention. It should be noted that a combination of two or more of the individual desirable configurations described below is also the present invention.

The threaded battery of the present invention has a first end and a second end facing each other in the longitudinal direction. The thread battery of the present invention has a first current collector arranged at the first end, a thread-like first electrode extending in the longitudinal direction, and a thread-like thread extending in the longitudinal direction from the first end to the second end. A solid electrolyte, a thread-like second electrode extending in the longitudinal direction, and a second current collector arranged at the second end are connected in this order.

In the thread battery of the present invention, since the first current collector and the second current collector are arranged at both ends of the battery, it is easy to connect a conductor to each current collector to draw a current. Further, by arranging a plurality of thread batteries of the present invention and connecting them in series or in parallel, the voltage design can be freely performed.

For example, a battery having an arbitrary shape can be configured by arranging a plurality of the thread batteries of the present invention in an array on a base material having a predetermined shape. At this time, if the first electrode and the second electrode do not come into contact with each other, a short circuit does not occur even if the adjacent thread batteries come into contact with each other. Further, the thread battery of the present invention may be used by bundling a plurality of the thread batteries in the same direction.

An example of the configuration of the thread battery of the present invention will be described with reference to FIG.
FIG. 1 is a perspective view schematically showing an example of the thread battery of the present invention.
The thread battery 1 shown in FIG. 1 has a first end portion 1a and a second end portion 1b facing in the longitudinal direction (direction indicated by the double-headed arrow L in FIG. 1). The thread battery 1 includes a first electrode 10, a second electrode 20, a solid electrolyte 30, a first current collector 70, and a second current collector 90.
The first electrode 10, the second electrode 20, and the solid electrolyte 30 are thread-like extending in the longitudinal direction, respectively, and the first current collector 70 and the first electrode are directed from the first end 1a to the second end 1b, respectively. 10, the solid electrolyte 30, the second electrode 20, and the second current collector 90 are connected in this order.
The first current collector 70 is arranged at the first end 1a, and the second current collector 90 is arranged at the second end 1b.
The end face of the solid electrolyte 30 on the first end 1a side is joined to the first electrode 10, and the end face of the solid electrolyte 30 on the second end 1b side is joined to the second electrode 20.

A part of the first current collector 70 and the second current collector 90 may be arranged so as to wrap around the outer peripheral surface of the thread battery 1.
However, the first current collector 70 is in a range that does not come into contact with the second electrode 20, and the second current collector 90 is in a range that does not come into contact with the first electrode 10.
When the first current collector 70 and the second current collector 90 are arranged so as to wrap around the outer peripheral surface of the thread battery 1, the contact area between the first current collector 70 and the first electrode 10 and the second The contact area between the current collector 90 and the second electrode 20 becomes large, and the internal resistance decreases. Further, when the first current collector 70 and the second current collector 90 are arranged so as to wrap around the outer peripheral surface of the thread battery 1, the peel strength of the current collector is improved.

In the thread cell of the present invention, the method of joining the electrode and the solid electrolyte is not particularly limited, and the end face of the solid electrolyte and the end face of the electrode may be temporarily fixed with a resin adhesive and then heat-treated to join. , The electrode and the solid electrolyte may be twisted and bonded, or both may be combined.

A method of twisting the electrode and the solid electrolyte will be described with reference to FIGS. 2 (a) and 2 (c).
2 (a) to 2 (c) are perspective views showing an example of a method of joining the first electrode and the solid electrolyte.
In FIG. 2A, the first electrode 10 and the solid electrolyte 30 are joined by spirally winding the solid electrolyte 30 around the first electrode 10.
In FIG. 2B, the first electrode 10 and the solid electrolyte 30 are joined by spirally winding the first electrode 10 around the solid electrolyte 30.
In FIG. 2C, the first electrode 10 and the solid electrolyte 30 are bonded to each other by twisting the first electrode 10 and the solid electrolyte 30 together.
Although the method of joining the first electrode 10 and the solid electrolyte 30 has been described in FIGS. 2 (a) and 2 (c), the method of joining the second electrode 20 and the solid electrolyte 30 is also shown in FIG. A method similar to the method shown in (a) to 2 (c) can be used.

In the thread battery of the present invention, at least a part of the outer peripheral surface may be covered with an insulating film made of an insulating material.
The outer peripheral surface of the thread battery means the outer peripheral surface of the first electrode, the outer peripheral surface of the second electrode, and the outer peripheral surface of the solid electrolyte.
When at least a part of the outer peripheral surface is covered with an insulating film made of an insulating material, it is possible to prevent the first electrode, the second electrode and the solid electrolyte from being damaged or short-circuited by an external impact or vibration. ..
Further, it is preferable that the outer peripheral surface of the joint portion between the first electrode and the solid electrolyte and the outer peripheral surface of the joint portion between the second electrode and the solid electrolyte are covered with an insulating film. When the outer peripheral surface of the joint portion between the first electrode and the solid electrolyte and the outer peripheral surface of the joint portion between the second electrode and the solid electrolyte are covered with an insulating film, the insulating film causes the first electrode and the solid electrolyte to be connected to each other. The joint strength of the joint portion and the joint portion between the second electrode and the solid electrolyte becomes stronger.

FIG. 3 is a perspective view schematically showing an example of a thread battery provided with an insulating film.
The thread battery 3 shown in FIG. 3 corresponds to an insulating film 100 made of an insulating material provided on the outer peripheral surface of the thread battery 1 shown in FIG.
In the thread battery 3, in addition to the outer peripheral surface of the joint portion between the first electrode 10 and the solid electrolyte 30 and the outer peripheral surface of the joint portion between the second electrode 20 and the solid electrolyte 30, parts other than the joint portion are also included. Each is covered with an insulating film 100.

The thread battery of the present invention preferably has flexibility.
When the thread battery has flexibility, it is easy to follow the shape of the accommodation space.
In the present specification, it is determined that the thread battery has flexibility when it is not destroyed even if it is deformed until the radius of curvature becomes 50 mm.
When the thread battery is arranged along the inner peripheral surface of the ring having an inner diameter of 100 mm, if the thread battery is not destroyed, it is not destroyed even if it is deformed until the radius of curvature becomes 50 mm, that is, it has flexibility. Judge.

The diameter of the thread battery of the present invention is not particularly limited, but is preferably 0.005 mm or more and 3 mm or less.
When the diameter of the thread battery is 0.005 mm or more and 3 mm or less, the thread battery has sufficient flexibility and easily follows the shape of the accommodation space.
If the diameter of the thread battery is less than 0.005 mm, the diameter of the thread battery is too small to obtain a sufficient capacity. In addition, the internal resistance of the thread battery may become too large. On the other hand, if the diameter of the thread battery exceeds 3 mm, the flexibility of the thread battery may decrease.
The diameter of the thread battery was measured from the cross-sectional shape of the cross section perpendicular to the longitudinal direction of the thread battery at three locations (9 locations in total) randomly selected from the first electrode, the second electrode, and the solid electrolyte. , Can be obtained by taking the average value. The part where the first electrode and the solid electrolyte are twisted and joined, and the part where the second electrode and the solid electrolyte are twisted and joined are not selected when determining the diameter.
However, when the cross-sectional shape of the thread battery is not circular, the diameter of the circle corresponding to the projected area obtained from the cross-sectional area is defined as the cross-sectional diameter.
When the insulating film is formed, the thickness of the insulating film is also included in the diameter of the thread battery.

The diameters of the first electrode, the solid electrolyte, and the second electrode may be the same or different.

The length of the threaded battery of the present invention in the longitudinal direction is not particularly limited, but is preferably 1 mm or more.

The lengths of the first electrode, the solid electrolyte, and the second electrode in the longitudinal direction are not particularly limited, but may be the same or different from each other.

In the thread battery of the present invention, the ratio of diameter to length is not particularly limited, but [(length) / (diameter)] is preferably 5 or more.

In the thread battery of the present invention, the cross-sectional shape of the cross section perpendicular to the longitudinal direction is not limited to a circle, and may be an elliptical shape or a polygonal shape.

In the thread battery of the present invention, one of the first electrode and the second electrode serves as a positive electrode, and the other serves as a negative electrode. Hereinafter, an example in which the first electrode is the positive electrode and the second electrode is the negative electrode will be described.

[First electrode]
The first electrode has a filamentous shape extending in the longitudinal direction, and is composed of a sintered body containing positive electrode active material particles.
Examples of the material constituting the positive electrode active material particles include a lithium-containing phosphoric acid compound having a pearcon-type structure, a lithium-containing phosphoric acid compound having an olivine-type structure, a lithium-containing layered oxide, and a lithium-containing oxide having a spinel-type structure. Oxides such as.
Specific examples of the lithium-containing phosphoric acid compound having a Nashikon-type structure preferably used include Li ₃ V ₂ (PO ₄ ) ₃ . Specific examples of the lithium-containing phosphoric acid compound having an olivine-type structure preferably used include LiFePO ₄ , LiCoPO ₄ , LiMnPO _{4, and the} like. Specific examples of the lithium-containing layered oxide preferably used include LiCoO ₂ , LiCo _1/3 Ni _1/3 Mn _1/3 O _{2, and the} like. Specific examples of the lithium-containing oxide having a spinel-type structure preferably used include LiMn ₂ O ₄ , LiNi _0.5 Mn _1.5 O _{4, and the} like.
Only one of these positive electrode active material particles may be used, or a plurality of types may be mixed and used.
Of these, Li ₃ V ₂ (PO ₄ ) ₃ is particularly preferred.

The first electrode may contain solid electrolyte particles and conductive particles in addition to the positive electrode active material particles.
Examples of the material constituting the solid electrolyte particles include oxides constituting the solid electrolyte described later.
The solid electrolyte particles are preferably the same as the oxides constituting the solid electrolyte described later.
When the first electrode contains solid electrolyte particles and the solid electrolyte particles are the same as the oxides constituting the solid electrolyte, the bonding between the first electrode and the solid electrolyte becomes strong, and the response speed and the machine Improves target strength.
Examples of the conductive particles include particles composed of a metal such as Ag, Au, Pt, Pd, a compound having carbon and electron conductivity, or a mixture thereof. Further, these conductive substances may be contained in the first electrode in a state of being coated on the surface of the positive electrode active material particles.

The length of the first electrode in the longitudinal direction is not particularly limited, but the length is preferably such that the ratio of the volume of the first electrode to the total volume of the thread battery is 20% by volume or more and less than 80% by volume. ..

[Second electrode]
The second electrode has a filamentous shape extending in the longitudinal direction, and is composed of a sintered body containing negative electrode active material particles.
As an example of the material constituting the negative electrode active material particles, for example, MO _X (M is at least one selected from the group consisting of Ti, Si, Sn, Cr, Fe, Nb, V and Mo. _{Li Y} MO _X (M is at least one selected from the group consisting of Ti, Si, Sn, Cr, Fe, Nb, V and Mo), which is a compound represented by 9 ≦ X ≦ 3.0). .9 ≤ X ≤ 3.0, 2.0 ≤ Y ≤ 4.0), graphite-lithium compound, lithium alloy, lithium-containing phosphoric acid compound having a niobium-type structure, lithium having an olivine-type structure. Examples include a contained phosphoric acid compound and a lithium-containing oxide having a spinel-type structure, and examples thereof include a compound represented by _{MO X , a compound represented by Li Y} MO _X , a lithium-containing phosphoric acid compound having a pearcon type structure, and an olivine type. It is preferably an oxide such as a lithium-containing phosphoric acid compound having a structure or a lithium-containing oxide having a spinel-type structure.
The _{compound represented by MO X} may have a part of oxygen substituted with P or Si, or may contain Li. Specific examples of the lithium alloy preferably used include Li-Al and the like. Specific examples of the lithium-containing phosphoric acid compound having a Nashikon-type structure preferably used include Li ₃ V ₂ (PO ₄ ) ₃ and Li ₃ Fe ₂ (PO ₄ ) ₃ . Specific examples of the lithium-containing oxide having a spinel-type structure preferably used include Li ₄ Ti ₅ O ₁₂ . Only one of these negative electrode active material particles may be used, or a plurality of types may be mixed and used.
Of these, Li ₃ V ₂ (PO ₄ ) ₃ is particularly preferred.

The second electrode may contain solid electrolyte particles and conductive particles in addition to the negative electrode active material particles.
Examples of the material constituting the solid electrolyte particles include oxides constituting the solid electrolyte described later.
The solid electrolyte particles are preferably the same as the oxides constituting the solid electrolyte described later.
When the second electrode contains solid electrolyte particles and the solid electrolyte particles are the same as the oxides constituting the solid electrolyte, the bonding between the second electrode and the solid electrolyte becomes strong, and the response speed and the machine Improves target strength.
Preferred examples of the conductive particles include particles composed of a metal such as Ag, Au, Pt, Pd, a compound having carbon and electron conductivity, or a mixture thereof. Further, these conductive substances may be contained in the second electrode in a state of being coated on the surface of the negative electrode active material particles or the like.

In this specification, the oxide does not include sulfide oxide.

The length of the second electrode in the longitudinal direction is not particularly limited, but the length is preferably such that the ratio of the volume of the second electrode to the total volume of the thread battery is 20% by volume or more and less than 80% by volume. ..

[Solid electrolyte]
The solid electrolyte is in the form of threads extending in the longitudinal direction.
Examples of the solid electrolyte include oxides such as lithium-containing phosphoric acid compounds having a pearcon-type structure.
The preferred lithium-containing phosphoric acid compound having a NASICON-type structure _{used, Li x M y (PO 4} ) 3 (0.9 ≦ x ≦ 1.9,1.9 ≦ y ≦ 2.1, M is, Ti , At least one selected from the group consisting of Ge, Al, Ga and Zr).
As the lithium-containing phosphoric acid compound, Li _1.2 Al _0.2 Ti _1.8 (PO ₄ ) ₃ is preferable.
Lithium-containing phosphoric acid compounds having two or more types of Nasicon-type structures having different compositions may be mixed and used.

A preferred composition of the solid electrolyte is, for example, a vitrifiable composition represented by Li _{1 + x} Al _x Ge _2-x (PO ₄ ) ₃ [eg, Li _1.5 Al _0.5 Ge _1.5 (PO ₄ )). ₃ , Li _1.2 Al _0.2 Ge _{1.8 (} PO ₄ ) ₃ etc.], Li _{1 + x} Al _x Ge _{2- xy} (PO ₄ ) ₃ vitrifiable composition [for example, Li _1.5 Al _0.5 Ge _1.0 Ti _0.5 (PO ₄ ) ₃ , Li _1.2 Al _0.2 Ge _1.3 Ti _0.5 (PO ₄ ) ₃ etc.], AlPO ₄ , SiO _At least one selected from the group consisting of 2 and B ₂ O _{3 and Li 1 + x} Al _x Ge _2-x (PO ₄ ) ₃ or Li _{1 + x} Al _x Ge _{2- xy} (PO ₄ ) ₃ and Mixture of Li _{1 + x} Al _x Ge _2-x (PO ₄ ) ₃ and Li _{1 + x} Al _x Ge _{2- xy} (PO ₄ ) ₃ mixture, Li _{1 + x} Al _x Ge _2-x (PO ₄ ) ₃ Or Li _{1 + x} Al _x Ge _{2- xy} (PO ₄ ) ₃ in which a part of Li is replaced with Na, Co, Mn or Ni [For example, Li in which a part of Li is replaced with Na _{1. 1} Na _0.1 Al _0.2 Ge _1.3 Ti _0.5 (PO ₄ ) ₃ and Li _1.4 Na _0.1 Al _0.5 Ge _1.0 Ti _0.5 (PO ₄ ) ₃ etc.] , Li _{1 + x} Al _x Ge _2-x (PO ₄ ) ₃ or Li _{1 + x} Al _x Ge _{2- xy} (PO ₄ ) ₃ with a part of Ge replaced by Zr, Fe or V [for example, Li _1.2 Al _0.2 Ge _1.7 Zr _0.1 (PO ₄ ) ₃ , Li _1.5 Al _0.5 Ge _1.0 Ti _0.4 Zr _{0. 1} (PO ₄ ) ₃ etc.] and the like, and two or more of these may be mixed and used.

In addition to the lithium-containing phosphoric acid compound having a pearcon-type structure, the solid electrolyte may further contain an oxide solid electrolyte having a perovskite-type structure or an oxide solid electrolyte having a garnet-type or garnet-type similar structure. Specific examples of the oxide solid electrolyte having a perovskite type structure include La _0.55 Li _0.35 TiO ₃ , and specific examples of the garnet type or garnet type similar structure of the oxide solid electrolyte include, for example. Examples thereof include _{Li 7} La ₃ Zr ₂ O _12.

In the thread battery of the present invention, it is preferable that the first electrode, the second electrode and the solid electrolyte all contain oxides.
When the first electrode, the second electrode and the solid electrolyte all contain oxides, it becomes easy to form a sintered body. Further, even if the sintered body containing an oxide is fractured by applying stress, continuous fracture starting from each fractured fragment is unlikely to occur, so that the sintered body is less likely to shatter and short circuit is prevented, and the battery function is maintained.

In the thread battery of the present invention, it is preferable that at least one of the first electrode and the second electrode contains the same oxide as the solid electrolyte, and both the first electrode and the second electrode have the same oxide as the solid electrolyte. It is more preferable to contain. In particular, at least one of the first electrode and the second electrode preferably contains a lithium-containing phosphoric acid compound such as _{Li 1.2} Al _0.2 Ti _1.8 (PO ₄ ) _{3, preferably the first electrode and the second electrode.} It is more preferable that both of the second electrodes contain the lithium-containing phosphoric acid compound.
An electrode containing the same oxide as the solid electrolyte has a strong bond with the solid electrolyte, so that the response speed and the mechanical strength are improved.

In the threaded battery of the present invention, it is preferable that the first electrode, the second electrode and the solid electrolyte are substantially free of sulfides and sulfide oxides.

When the first electrode contains the same oxide as the solid electrolyte, the content thereof is preferably 30% by weight or more and 70% by weight or less.
If the content of the oxide in the first electrode is less than 30% by weight, the bonding strength between the first electrode and the solid electrolyte may not be sufficiently improved. On the other hand, if the content exceeds 70% by weight, the proportion of the positive electrode active material particles in the first electrode decreases, so that the energy density may decrease.
The content of oxide in the first electrode can be measured by composition analysis such as inductively coupled plasma (ICP) emission spectroscopic analysis. Further, simply, data analysis such as powder X-ray diffraction (XRD) can be used.

When the second electrode contains the same oxide as the solid electrolyte, the content thereof is preferably 30% by weight or more and 70% by weight or less.
If the content of the oxide in the second electrode is less than 30% by weight, the bonding strength between the second electrode and the solid electrolyte may not be sufficiently improved. On the other hand, if the content exceeds 70% by weight, the proportion of the negative electrode active material particles in the second electrode decreases, so that the energy density may decrease.
The content of oxides in the second electrode can be measured in the same manner as in the first electrode.

The length of the solid electrolyte in the longitudinal direction is not particularly limited, but the length is preferably such that the ratio of the volume of the solid electrolyte to the total volume of the thread battery is 30% by volume or less.

[Current collector]
The first current collector and the second current collector will be described.
When the first electrode is a positive electrode, the first current collector is a positive electrode current collector, and when the second electrode is a negative electrode, the second current collector is a negative electrode current collector.

The positive electrode current collector and the negative electrode current collector are not particularly limited as long as they have electron conductivity. The positive electrode current collector and the negative electrode current collector can be made of, for example, carbon, an oxide having high electron conductivity, a composite oxide, a metal, or the like. For example, it can be composed of Pt, Au, Ag, Al, Cu, stainless steel, ITO (indium tin oxide) and the like.
Ni or Al is preferable as the material constituting the positive electrode current collector. On the other hand, Cu is preferable as the material constituting the negative electrode current collector.

[Insulating film]
The material constituting the insulating film may be an insulating material, and examples thereof include glass, ceramics, and an insulating resin.
As the glass, for example, at least two kinds selected from the group consisting of _{quartz glass (SiO 2} ), SiO ₂ , PbO, B ₂ O ₃ , MgO, ZnO, Bi ₂ O ₃ , Na ₂ O and Al ₂ O ₃ Examples include composite oxide-based glass that combines the above.
Examples of ceramics include alumina, cordylite, mullite, steatite, and forsterite.
Examples of the insulating resin include thermoplastic resins such as polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyvinyl acetate, thermoplastic polyurethane, and Teflon (registered trademark), phenol resin, epoxy resin, melamine resin, urea resin, and non-resisting resin. Examples thereof include thermosetting resins such as saturated polyester resins, alkyd resins, polyurethanes and thermosetting polyimides, and photocurable resins.
The thickness of the insulating film is not particularly limited, but is preferably 0.005 mm or more and 1 mm or less.

[Production method]
The method for producing the thread battery of the present invention is not particularly limited.
In the thread battery 1 shown in FIG. 1, for example, a thread-like solid electrolyte, a thread-like first electrode, and a thread-like second electrode are prepared, and the first electrode is arranged on one end surface of the solid electrolyte in the longitudinal direction. , The second electrode is placed on the other end face of the solid electrolyte in the longitudinal direction, and the first current collector is placed on the end face of the first electrode that is not in contact with the solid electrolyte, and the solid electrolyte of the second electrode is placed. It can be obtained by arranging the second current collector on the end face on the side not in contact with. Further, an insulating film made of an insulating material may be formed on the outer peripheral surface of the obtained thread battery.

The thread battery of the present invention can be manufactured by the above procedure.

Examples of the method for obtaining the filamentous solid electrolyte include a method in which a mixed liquid containing a material constituting the solid electrolyte, an organic binder and a dispersion medium is spun and fired.
Further, the material constituting the solid electrolyte may be processed into a thread shape in a molten state.

Examples of the method for obtaining the filamentous first electrode include a method of spinning and firing a mixed liquid containing a material constituting the first electrode, an organic binder, and a dispersion medium.
Further, the material constituting the first electrode may be processed into a thread shape in a molten state.
Examples of the method for forming the first current collector on one end surface of the first electrode include laser processing, sputtering, plating, and the like.

Examples of the method for obtaining the filamentous second electrode include a method in which a mixed liquid containing a material constituting the second electrode, an organic binder and a dispersion medium is spun and fired.
Further, the material constituting the second electrode may be processed into a thread shape in a molten state.
Examples of the method for forming the second current collector on one end surface of the second electrode include laser processing, sputtering, plating, and the like.

Examples of a method for forming an insulating film made of an insulating material on the outer peripheral surface of the obtained thread battery include a dipping method and a coating method.

1, 3 Thread battery 1a 1st end 1b 2nd end 10 1st electrode 20 2nd electrode 30 Solid electrolyte 70 1st current collector 90 2nd current collector 100 Insulation film

Claims (3)

A threaded battery having a first end and a second end facing each other in the longitudinal direction.
From the first end to the second end, a first current collector arranged at the first end, a thread-like first electrode extending in the longitudinal direction, a thread-like solid electrolyte extending in the longitudinal direction, and a longitudinal direction. A thread battery characterized in that a thread-like second electrode extending in a direction and a second current collector arranged at the second end are connected in this order. The thread battery according to claim 1, wherein the first electrode, the second electrode, and the solid electrolyte all contain oxides. The thread battery according to claim 2, wherein at least one of the first electrode and the second electrode contains the same oxide as the solid electrolyte.

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