WO2013084591A1

WO2013084591A1 - Air battery

Info

Publication number: WO2013084591A1
Application number: PCT/JP2012/076476
Authority: WO
Inventors: 宮澤　篤史; 友克姫野
Original assignee: 日産自動車株式会社
Priority date: 2011-12-05
Filing date: 2012-10-12
Publication date: 2013-06-13

Abstract

Conventional air batteries had room for improvement in relation to increasing conductivity in the in-plane direction (direction along the plane) in a positive electrode. Provided is an air battery (A), comprising a positive electrode (2) and a negative electrode (3) having an electrolyte layer (1) therebetween; wherein the positive electrode (2) comprises a base material layer (21) comprising a conductive porous material, and a conductive coating (23) having higher conductivity than the base material layer (21) and capable of being ventilated is provided on at least one main surface of the base material layer (21). As a result, the conductivity in the in-plane direction in the positive electrode (21) is increased and the resistance overvoltage is reduced.

Description

Air battery

The present invention relates to an air battery using oxygen as a positive electrode active material.

As a conventional air battery, for example, there is one described in Patent Document 1. In the air battery described in Patent Document 1, a positive electrode is composed of a positive electrode base material and a catalyst layer. The positive electrode base material uses a porous metal material having a large number of pores such as mesh, expanded metal, punching metal, and lath metal, and a metal powder is fixed to the surface of the porous metal material so that the entire surface is fine. Concavities and convexities are provided. And a positive electrode forms a catalyst layer so that a positive electrode base material may be embed | buried, and in this case, it forms so that a catalyst layer may bite into the fine unevenness | corrugation of a positive electrode base material. An electrical contact state is maintained.

JP 2002-151086 A

However, in the conventional air battery as described above, in the positive electrode, although the electrical contact state between the positive electrode substrate and the catalyst layer can be improved, the conductivity in the in-plane direction (direction along the surface) is increased. There was room for improvement. That is, in the positive electrode of the conventional air battery, considering the conductivity in the in-plane direction, electrons generated in the catalyst layer flow to the outside through the porous metal material constituting the positive electrode substrate. For this reason, in the catalyst layer, there is an internal resistance until reaching the porous metal material, particularly in the range of the pores of the porous metal material. The longer the distance to, the greater the internal resistance.

In recent years, research and development of air batteries used as a main power source or auxiliary power source for a moving body such as an automobile has been performed. In this case, an assembled battery is configured using a large number of air batteries. Considering the total area of the positive electrode at, the above-mentioned internal resistance cannot be ignored.

The present invention has been made in view of the above-described conventional situation, and it is an object of the present invention to provide an air battery that can increase resistance in the in-plane direction of the positive electrode and reduce resistance overvoltage. .

The air battery of the present invention includes a positive electrode and a negative electrode with an electrolyte layer interposed therebetween, and the positive electrode includes a base material layer made of a conductive porous material, and the base material layer is formed on at least one main surface of the base material layer. It has a configuration in which a conductive film having higher conductivity and ventilation is provided, and the above configuration is a means for solving the conventional problems.

In the above configuration, the conductive porous material constituting the base material layer is a microporous material using carbon paper or the like as a conductive filler, and a member having a large number of pores such as a mesh or punching metal ( It is different from the porous metal material referred to in the prior art. The conductive film can be formed by various surface treatments.

According to the air battery of the present invention, since the above configuration is adopted, the in-plane conductivity at the positive electrode can be increased and the resistance overvoltage can be reduced.

It is sectional drawing (A) and top view (B) explaining one Embodiment of the air battery of this invention. It is each a top view (A) (B) explaining two forms of a conductive film. It is a perspective view explaining an example of manufacture of a positive electrode member. It is a front view explaining the other example of manufacture of a positive electrode member. It is sectional drawing (A) (B) which shows two embodiment of a positive electrode, respectively. It is sectional drawing (A) (B) which shows two other embodiment of a positive electrode, respectively. It is sectional drawing (A) and plane explanatory drawing (B) which show other embodiment of a positive electrode.

Hereinafter, embodiments of an air battery of the present invention will be described in detail with reference to the drawings.
An air battery A shown in FIG. 1 has a rectangular plate shape, and an upper positive electrode 2 in FIG. (A) and a lower negative electrode 3 in FIG. I have. In addition, the air battery A in the illustrated example includes an outer frame member 4 that has electrical insulation and surrounds at least the positive electrode 2 and the outer periphery of the electrolyte layer 1.

The electrolyte layer 1 stores an aqueous solution (electrolytic solution) or a non-aqueous solution mainly composed of potassium hydroxide (KOH) or chloride, and includes an appropriate member for storing the aqueous solution or the non-aqueous solution. There is.

The positive electrode 2 includes a base material layer 21 made of a conductive porous material and a liquid-tight ventilation layer 22 disposed on the surface of the positive electrode in a laminated state. The positive electrode 2 is provided with a conductive coating 23 that has higher conductivity and ventilation than the base material layer 21 on at least one main surface of the base material layer 21. A conductive coating 23 is provided on the main surface on the upper side.

Further, as shown in FIG. 1B, the positive electrode 2 includes contact members 24 serving as current collectors at both ends on the short side of the base material layer 21. The contact member 24 is interposed between the outer frame member 4 on the cross section shown in FIG. 1A, the inner end portion is in contact with the peripheral edge portion of the base material layer 21, and the outer end portion is on the positive electrode surface side. Is exposed.

In the positive electrode 2, the base material layer 21 is formed of a conductive porous material containing a catalyst. For example, inside the conductive porous material formed of a carbon material as a conductive filler and a binder resin, A catalyst such as manganese dioxide is supported.

The liquid-tight ventilation layer 22 is a member that has liquid-tightness (water-tightness) with respect to the electrolyte solution of the electrolyte layer 1 and has air-permeability with respect to oxygen. The liquid-tight ventilation layer 22 uses a water-repellent film such as a fluororesin so as to prevent the electrolytic solution from leaking to the outside. On the other hand, a large number of the liquid-tight ventilation layer 22 can supply oxygen to the base material layer 21. Have fine pores. Details of the conductive coating 23 will be described later.

The contact member 24 is made of metal, and for example, metal such as copper (Cu), stainless steel, and nickel (Ni) can be used. Also, other metals can be used if they are surface-treated so as to ensure corrosion resistance to the electrolytic solution. Further, the contact member 24 may be plated with gold (Au) or silver (Ag) on at least one of the contact surfaces in order to reduce the contact resistance with the base material layer 21 or the conductive coating 23. it can.

The negative electrode 3 includes a negative electrode member 31 and a negative electrode current collecting member 32 disposed on the negative electrode surface in a stacked state. In this negative electrode 3, the negative electrode member 31 is made of a material such as a pure metal such as lithium (Li), aluminum (Al), iron (Fe), zinc (Zn), and magnesium (Mg), or an alloy. .

The negative electrode current collecting member 32 is a conductive member made of a material capable of preventing the electrolyte solution of the electrolyte layer 1 from leaking to the outside. For example, stainless steel, copper (alloy), or a metal material has a corrosion resistance on the surface. For example, a plated metal.

The outer frame member 4 surrounds the outer periphery of the negative electrode member 31 of the negative electrode 3 in addition to the outer periphery of the electrolyte layer 1 and the positive electrode 2. For this reason, the negative electrode current collecting member 32 of the negative electrode 3 is provided so as to close the opening portion on the negative electrode side of the outer frame member 4.

The outer frame member 4 is preferably made of a resin having an electrolytic solution resistance such as polypropylene (PP) or engineering plastic (so-called engineering plastic), which can also reduce the weight. The outer frame member 4 can also be made of fiber reinforced plastic (FRP) in which a resin is compounded with reinforcing fibers such as carbon fibers and glass fibers in order to give mechanical strength.

The conductive coating 23 in the positive electrode 2 has a continuous shape in the in-plane direction (direction along the main surface) of the main surface of the base material layer 21. The shape of the conductive film 23 is not particularly limited, and may be regular or irregular, and can be provided on a part of the main surface of the base material layer 21 or on the entire main surface. Further, as in this embodiment, in the positive electrode 2, when the contact member 24 as a current collector is provided at the end of the base material layer 21, the conductive coating 23 is formed from the main surface of the base material layer 21. It is more desirable to form continuously in the range which reaches a current collection part (contact member 24).

That is, the conductive film 23 can be formed in a stripe shape as shown in FIG. 2 (A) or in a mesh shape as shown in FIG. 2 (B). In addition, when forming in stripe form, it forms in the direction from one current collection part (contact member 24) to the other current collection part, and is mutually parallel. At this time, the conductive film 23 can be ventilated mainly in a portion (exposed portion of the base material layer 21) that becomes an empty space of a stripe or a mesh.

In addition, the conductive film 23 includes, as a conductive component, gold (Au), silver (Ag), copper (Cu), nickel (Ni), palladium (Pd), chromium (Cr), and carbon (C). One or more is the main component. The conductive film 23 can be formed by any one of surface treatments among plating, sputtering and coating. At this time, the conductive coating 23 can be ventilated by forming the base layer 21 made of a conductive porous material so thin as not to block the pores. In particular, when the conductive coating 23 is formed by plating, the conductive coating 23 is formed by energizing the base material layer 21. Therefore, the conductive coating 23 is formed with the pores of the base material layer 21 being opened. Can do.

In the air battery A, as shown by the arrows in FIG. 1, electrons generated on the reaction surface flow toward the current collectors (contact members 24) at both ends. Therefore, since the conductive film 23 needs to be arranged along the direction of electron flow, a linear shape as shown in FIG. 2A is desirable. However, when control is difficult, it is meandered or bent randomly. However, it can also have a shape that matches the flow of electrons as an apparent direction.

FIG. 3 is a diagram for explaining an example of manufacturing the base material layer 21. In this production example, a resin film substrate 50 through which the material of the base material layer 21 does not pass is used. The base 50 is made of a non-conductive resin or glass in consideration of the plating process to be performed later. Next, a conductive porous material is applied on the substrate 50 and dried to form the base material layer 21. Thereafter, a conductive film 23 is formed on the surface of the base material layer 21 by plating, and finally the base material layer 21 having the conductive film 23 is separated from the substrate 50.

It should be noted that the relationship between the pore diameter of the conductive porous material forming the base material layer 21 and the plating solution entering therein can be calculated from an equation relating to the capillary phenomenon. At this time, it is desirable to perform plating on the surface as close to the surface layer as possible so that the inside of the pores can be plated or the physical properties of the base material layer 21 do not change because the pore diameter becomes small. For this reason, it is preferable to control the surface tension of the plating solution in consideration of the pore distribution of the base material layer 21. Moreover, in order not to block the pores, it is preferable to increase the viscosity of the plating solution. For example, it can be adjusted by adding a thickener to the plating solution.

FIG. 4 is a diagram for explaining another example of manufacturing the base material layer 21. In this production example, two sheet-like base material layers 21 and 21 wound around a pair of

rolls

51 and 51 are used, and these are passed through a plating tank 52 and taken up by a pair of winding

rollers

53 and 53. Thus, the conductive film (23) is continuously formed on the base material layers 21 and 21.

Thus, by plating the two sheet-like base material layers 21 on top of each other, it is possible to perform the plating process simultaneously on the outer surfaces of each other. As for the plating treatment, the thickness can be controlled by the current (voltage), temperature, and feed rate of the base material layer 21, and the viscosity of the plating solution is controlled as described above to prevent entry into the pores. Can be implemented. Also, the conductive film 23 can be similarly formed by sputtering. In this case, the thickness can be controlled by bias voltage, temperature, processing time, and the like.

In the air battery A having the above-described configuration, the conductive film 23 is provided on the base material layer 21 in the positive electrode 2, thereby improving the in-plane conductivity of the base material layer 21 itself. Conductivity can be increased and resistance overvoltage can be reduced. Therefore, it is possible to improve the power generation performance corresponding to the resistance overvoltage. In addition, since the air battery A employs the conductive coating 23 formed by the surface treatment, a current collecting member as a separate part is unnecessary, and the substrate layer 21 can be reduced in thickness and weight. Since a large contact area between the conductive film 23 and the conductive film 23 is obtained, the current collection efficiency is improved.

Furthermore, since the air battery A has the conductive film 23 formed in a continuous shape in the in-plane direction, the resistance overvoltage in the positive electrode 2 is further reduced, and the conductive film 23 is collected from the main surface of the base material layer 21. Since it was continuously formed in the range up to the portion (contact member 24), it is possible to further improve the current collection performance.

Further, the conductive coating 23 can naturally be formed over the entire main surface of the base material layer 21, but by forming a shape having a void as shown in FIG. The material of the conductive coating 23 can be saved to the minimum necessary while ensuring sufficient conductivity and air permeability, and can contribute to reduction in manufacturing cost.

Further, the air battery A has gold (Au), silver (Ag), copper (Cu), nickel (Ni), palladium (Pd), chromium (Cr), and carbon (C) as conductive components of the conductive film 23. Since one or more of them are the main components, good conductive performance can be obtained while maintaining the corrosion resistance inside the battery.

Further, since the air battery A is formed by any one surface treatment of plating, sputtering, and coating, the conductive coating 23 can be formed relatively inexpensively and with high accuracy, and the manufacturing cost can be reduced. Reduction can also be realized.

Furthermore, since a plurality of air batteries A can be directly connected in series to form an assembled battery, it is very suitable as a power source for a moving body such as an automobile, and improves the power generation performance of the assembled battery. Can do. Moreover, since the air battery A comprises the battery outer peripheral part by the outer frame member 4 which has electrical insulation, the positional relationship which a positive electrode terminal (contact member 24) and a negative electrode terminal (negative electrode current collection member 32) conflict. It becomes a safe structure that is difficult to short circuit. In a structure in which one electrode also serves as a battery exterior portion as in a known button battery, the distance between the positive electrode terminal and the negative electrode terminal is very short.

5 to 7 are diagrams for explaining other embodiments of the air battery according to the present invention. Note that the same components as those of the previous embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

The air battery A shown in FIG. 5 (A) has a structure in which, in the positive electrode 2, a conductive coating 23 is provided on the main surface outside the positive electrode of the base material layer 21 made of a conductive porous material. 5B has a structure in which a conductive coating 23 is provided on the main surface of the base material layer 21 of the positive electrode 2 on the electrolyte layer 1 side.

The air battery A shown in FIG. 6A has a structure in which the positive electrode 2 has a liquid-tight ventilation layer 22 on the outer surface of the positive electrode, and a conductive film 23 is provided on the main surface of the base material layer 21 on the electrolyte layer 1 side. . Further, in the air battery A shown in FIG. 6B, the positive electrode 2 has the liquid-tight air-permeable layer 22 as in the embodiment shown in FIG. In this structure, a conductive film 23 is provided on the surface.

As shown in FIGS. 5 and 6, the basic structure of the air battery A of the present invention is that the positive electrode 2 includes a base material layer 21 made of a conductive porous material containing a catalyst, most of which is mainly carbon. It is formed with the material which was made. And the air battery A of this invention provides the base material by providing the highly conductive conductive film 23 in the at least one main surface of the base material layer 21 according to the structure and the electrical property of a conductive porous material. The electrical conductivity of the layer 21 is increased to reduce the apparent electrical resistance and improve the power generation performance.

Further, since the air battery A uses a potassium hydroxide (KOH) aqueous solution for the electrolyte layer 1, as shown in FIGS. 1 and 6, a water-repellent film (liquid-tight ventilation layer 22) is formed on the outermost part of the positive electrode 2. To prevent leakage of the aqueous solution.

Furthermore, the air battery A may arrange another layer outside the liquid-tight air-permeable layer 22 depending on the purpose. In the air battery A shown in FIG. 7A, the positive electrode 2 includes the base material layer 21 and the liquid-tight ventilation layer 22, and the main surface of the base material layer 21 on the electrolyte layer 1 side has high conductivity. A coating 23 is provided, and an opening 41 as another layer is provided outside the liquid-tight ventilation layer 22.

The opening body 41 is formed by regularly arranging a large number of openings, and a metal or resin net, expanded metal, punching metal, or the like can be used. For example, when the plurality of air batteries A are connected in series, the opening 41 protects the liquid-tight ventilation layer 22 and forms an air flow path between the adjacent air batteries A.

Here, in the air battery A provided with the above-described opening body 41, as a more preferable embodiment, the area of the conductive film 23 is not less than the actual area excluding the opening of the opening body 41. At this time, as illustrated in FIG. 2, the air battery A forms the conductive film 23 over the entire main surface of the base material layer 21, and then calculates the area of the conductive film 23 and the actual area of the opening 41. It is desirable to satisfy the relationship. The shape of the conductive film 23 is not particularly limited.

In the air battery A described above, the apparent area of the conductive coating 23 becomes larger than the aperture ratio of the opening 41, and the rate at which the base material layer 21 and the conductive coating 23 are compressed by the opening 41 is increased. . As a result, the air battery A has a portion in the positive electrode 2 to which a load is applied by the opening 41, and can increase the adhesion between the base material layer 21 and the conductive coating 23 to reduce the electrical resistance. The effect of preventing the conductive film 23 from being peeled off due to the difference in the coefficient of thermal expansion from the material layer 21 can also be obtained. In addition, the mechanical strength of the positive electrode 2 is improved by the opening 41, and the mechanical strength of the air battery A is also improved.

Moreover, as for air battery A provided with said opening body 41, as a more preferable embodiment, the conductive film 23 shall be arrange | positioned with the period, phase, and direction different from the arrangement | sequence of the opening in the opening body 41. Can do. That is, since the shape of the conductive coating 23 is not particularly limited, the conductive coating 23 is disposed so as to partially overlap the opening 41. Specifically, as shown in an example in FIG. 7B, when the opening 41 has a net shape in which wires are combined vertically and horizontally, the conductive film 23 is arranged in an oblique stripe shape.

In the air battery A described above, when the opening 41 faces the conductive coating 23, even if the conductive coating 23 is not processed in an indefinite shape, the period, phase, and direction are shifted with respect to the arrangement of the openings. By forming the coating 23 in a minimum amount, current collecting properties can be ensured. In the air battery A, a portion to which a load is applied by the opening 41 in the positive electrode 2 is increased, and the adhesion between the base material layer 21 and the conductive coating 23 can be increased to reduce the electrical resistance. As described above, the effect of preventing peeling of the conductive film 23 is also obtained.

空気 Furthermore, the air battery A of the present invention can also be provided with a conductive opening 41 in contact with the conductive coating 23 of the base material layer 21 on the positive electrode 2. In this case, the distribution of the conductive film 23 is made denser than the distribution of the openings of the opening 41. Specifically, as shown in FIG. 7B, when the stripe-shaped conductive film 23 and the net-like opening 41 are employed, the conductive film 23 has a size larger than that of the opening of the opening 41. Increase the width or decrease the pitch.

In the air battery A, electrons generated in the base material layer 21 flow in the in-plane direction from the conductive film 23 through the opening 41. At this time, in the base material layer 21, high conductivity is ensured by the conductive coating 23 as described above. For example, when considering the range of the opening of the opening 41, the internal resistance between the conductive coating 23 and the opening 41 is reached. Is extremely small, electrons flow favorably in the in-plane direction from the conductive film 23 through the opening 41. As a result, the air battery A has higher conductivity in the in-plane direction of the positive electrode 2.

Since the air battery of the present invention described in each of the above embodiments has a certain relationship between the thickness and coverage of the conductive coating 23 and the electrical resistance in the in-plane direction of the base material layer 21, based on the relationship, The reduction in electrical resistance and the gas permeability of the base material layer 21 are made compatible. In general, since a metal-air battery does not generate electricity at a high output, the amount of necessary oxygen is limited. Therefore, the material of the base material layer 21 does not have to be a conductive porous material having a porosity of more than 80% as in a gas diffusion layer used in a polymer electrolyte fuel cell. Any conductive porous material having a porosity of about 20% may be used. As a result, it was found that the air battery of the present invention can be used even when the coverage of the conductive film 23 is 80 to 95%. Specific examples are described in the following examples.

As a base material layer made of a conductive porous material, a sheet-like sample having 70 wt% carbon, 30 wt% polytetrafluoroethylene (PTFE), a porosity of 65%, and a thickness of 100 μm was used. While this sample was used as a comparative example before the surface treatment, Ag plating treatment was performed on the same sample to form plating layers (conductive films) having different thicknesses, and these were designated as Examples 1 to 5.

In Example 1, a plating layer having a thickness of 1 nm was formed as a conductive film on one entire surface of a sheet-like sample. In Example 2, a plating layer having a thickness of 5 nm was formed as a conductive film on the entire surface of one side of the sheet-like sample. In Example 3, a plating layer having a thickness of 1 μm was formed as a conductive film on the entire surface of one side of a sheet-like sample. In Example 4, a plating layer having a thickness of 5 μm was formed as a conductive coating on the entire surface of one side of the sheet-like sample. In Example 5, a plating layer having a width of 1 mm and a thickness of 5 nm was disposed at an interval of 4 mm as a conductive film on one side of the sheet-like sample.

Here, the thickness of the plating layer (conductive film) was measured by XRF. Moreover, since it is difficult to measure the film thickness of 1 nm, it was controlled by the processing time. About Example 5, the striped plating layer was formed by arrange | positioning masking by previously arrange | positioning a sealing material with weak adhesiveness in a non-plating site | part, and performing a plating process after that.

As a comparison method, a sheet made of a conductive porous material having a length and width of 50 mm and a thickness of 50 μm was prepared, and the electrical resistance in the direction of the two sides was measured on the assumption that current was collected on two opposite sides. . Moreover, in order to confirm whether the porosity was not impaired remarkably by the plating layer, the ventilation | gas_flow test by a Gurley measurement was implemented. In Gurley measurement, the sample was placed on a 300-mesh wire net and measured in order to maintain the shape of the sheet-like sample (positive electrode member).

(Measurement method of electrical resistance)
The resistivity of the sample was measured by a four-probe method according to JIS-K7194. That is, the resistance is calculated by applying a constant current from the two outer sides of the four electrodes and measuring the voltage with the two inner electrodes. In this example, Lorester GP (manufactured by Mitsubishi Chemical) was used in accordance with this evaluation method. The resistance value was measured by applying a measurement probe to the surface not plated. Table 1 shows in-plane resistance values in Examples 1 to 5 and Comparative Examples.

As is apparent from Table 1, in Example 1 where the thickness of the plating layer is 1 nm as compared with the comparative example, the resistance reduction is confirmed, and in Examples 2 to 5 where the thickness of the plating layer is 5 nm or more A remarkable resistance reduction was confirmed. In addition, when the thickness of the plating layer is 1 μm or more, it has been clarified that the effect of reducing the resistance is small because a sufficient conductive path is secured.

In Example 5 in which the plating layer was formed in a stripe shape, measurement was performed by applying a probe to the length direction of the stripe. Even when the thickness of the plating layer was a stripe shape of 5 nm, sufficient resistance reduction was confirmed. That is, even if the thickness of the plating layer is thin, the effect can be obtained only by selecting the formation of the plating layer in the electron flow direction, and the plating amount can be minimized. Next, Table 2 shows the aeration test result by Gurley measurement.

As is clear from Table 2, it was confirmed that the numerical values of Examples 1, 2, and 5 were not significantly different from those of the comparative example having no plating layer, and sufficient air permeability was obtained. In Examples 3 and 4, it was confirmed that air permeability was sufficiently ensured although a slight increase in the numerical value was observed. That is, it has been found that the air permeability can be appropriately controlled by the air permeability of the conductive porous material (base material layer) itself regardless of the thickness of the plating layer.

In the air battery of the present invention, the conductive film is formed on the base material layer made of a conductive porous material according to the above-described embodiment, thereby improving both in-plane conductivity and reducing resistance and gas permeability. It has been confirmed that it can be realized, and on top of that, it has been made thinner and lighter.

The configuration of the air battery according to the present invention is not limited to the above-described embodiments. For example, the air battery may have a polygonal shape or a circular shape other than the rectangular plate shape, and does not depart from the gist of the present invention. The details of the configuration can be changed as appropriate.

A Air battery 1 Electrolyte layer 2 Positive electrode 3 Negative electrode 21 Base material layer 23 Conductive coating 24 Contact member (current collector)
41 Opening body

Claims

Provided with a positive electrode and a negative electrode with an electrolyte layer in between,
The positive electrode includes a base material layer made of a conductive porous material, and at least one main surface of the base material layer is provided with a conductive film that has higher conductivity than the base material layer and can be ventilated. Features an air battery.
2. The air battery according to claim 1, wherein the conductive film has a continuous shape in the in-plane direction of the main surface of the base material layer.
The positive electrode has a current collector at an end of the base material layer;
The air battery according to claim 2, wherein the conductive film is continuously formed in a range from the main surface of the base material layer to the current collector.
The air battery according to any one of claims 1 to 3, wherein the base material layer comprises a catalyst supported on a conductive porous material formed of a carbon material and a binder resin.
On the outer surface side of the positive electrode, provided with an opening formed by arranging a large number of openings,
The air battery according to any one of claims 1 to 4, wherein an area of the conductive film is equal to or larger than an actual area excluding an opening of the opening.
6. The air battery according to claim 5, wherein the conductive film is arranged with a period, a phase and a direction different from the arrangement of the openings in the opening.
The conductive coating has one or more of gold (Au), silver (Ag), copper (Cu), nickel (Ni), palladium (Pd), chromium (Cr) and carbon (C) as a conductive component. The air battery according to any one of claims 1 to 6, characterized by comprising as a main component.
The air battery according to any one of claims 1 to 7, wherein the conductive film is formed by any one of plating, sputtering and coating.