Air cell positive electrode

Abstract

The application provides an air cell positive electrode, comprising a positive electrode container, the positive electrode container comprising a positive electrode container cavity and a cavity opening in communication with the positive electrode container cavity; a waterproof air-permeable film sealing the cavity opening; a positive electrode body filled in the positive electrode container cavity, the positive electrode body being composed of a plurality of filamentous positive electrode sub-bodies; an electrolyte filled in the positive electrode container cavity and a positive electrode lead wire in communication with the positive electrode body. Compared with the prior art, the air cell positive electrode has the beneficial effects that the positive electrode is in the form of filaments and is distributed in the cavity, and in use, air is more easily dispersed in the cavity, and the raw material cost is further reduced while the effect is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery, in particular to an air battery positive electrode. BACKGROUND

[0002] The positive electrode structure is a very important component in air battery, which directly affects the working efficiency of the battery. The existing positive electrode is prepared by using porous structure material, and the existing research direction is to develop porous structure material.

[0003] However, when using porous material as catalyst in the positive electrode structure, simple filling is often used, which makes the gas in the positive electrode prepared by porous material cannot be fully dispersed, resulting in too low reaction rate, and its use is limited accordingly, and the development of new material costs too much. SUMMARY

[0004] To solve the above technical problems, the present application provides an air battery positive electrode.

[0005] The specific technical solutions are as follows:

[0006] An air battery positive electrode, which is different in that it comprises:

[0007] A positive electrode container comprising a positive electrode container cavity and a first cavity opening and a second cavity opening in communication with the positive electrode container cavity, the first cavity opening being closed by a closure comprising a waterproof air-permeable film, and gas entering the first cavity opening through the waterproof air-permeable film;

[0008] A positive electrode body filled in the positive electrode container cavity, the positive electrode body being composed of a plurality of filamentous positive electrode sub-bodies and being removable from the second cavity opening;

[0009] An electrolyte filled in the positive electrode container cavity;

[0010] And

[0011] A positive electrode lead in communication with the positive electrode body, one end of the positive electrode lead being placed outside the positive electrode container cavity;

[0012] Wherein, the air battery positive electrode uses oxygen and water as raw materials for reduction reaction.

[0013] Compared with the prior art, the present application has the advantages that the positive electrode body is in the form of filamentous distribution in the cavity, and in use, air is more easily dispersed in the cavity, while ensuring the effect, the raw material cost is further reduced.

[0014] Further, the positive electrode sub-bodies of the positive electrode body are separated from each other.

[0015] The beneficial effects of adopting the further technical solutions are that the gas passage is prevented from being blocked, and the diffusion of the reaction gas is more favorable.

[0016] Further, the waterproof and breathable membrane is made of polytetrafluoroethylene.

[0017] Further, the air cell anode further comprises a gas pump in communication with the waterproof and breathable membrane.

[0018] The beneficial effects of adopting the further technical solutions are that air enters the anode container cavity through the gas pump, which can further accelerate the diffusion of the gas and improve the reaction rate.

[0019] Further, the closure comprises a waterproof and breathable membrane arranged at the first cavity opening and a gas cavity arranged below the waterproof and breathable membrane, and the gas pump is connected with the gas cavity.

[0020] Further, the closure further comprises a closure body, the closure body is provided with a plurality of through holes, the waterproof and breathable membrane is arranged at the through holes, and the through holes and the gas pump are connected through a pipeline.

[0021] Further, the anode body comprises an electrically conductive base body and an electrode metal layer covering the outside of the electrically conductive base body, and the material of the electrode metal catalytic layer is Ag.

[0022] Further, the electrically conductive base body and the electrode metal layer further comprise a supported catalyst layer, the supported catalyst layer is made of graphitized activated carbon or graphene as a supported layer, and one or more of manganese dioxide, elemental nanosilver powder, perovskite cobalt oxide, or platinum is supported.

[0023] The beneficial effects of adopting the further technical solutions are that the catalyst layer is used to accelerate the reaction rate, and the filamentous structure is used to make the catalyst have a large specific surface area in the anode reaction system, so that the specific surface area of the anode body is large, i.e., the larger the surface area of the catalyst, the more solid-liquid-gas three-phase interfaces are formed, and the more oxygen and water are reduced to OH - ions.

[0024] Further, the anode body is in a curved filamentous structure.

[0025] The beneficial effects of adopting the further technical solutions are that the surface area of the catalyst can be further increased.

[0026] Further, the air cell anode further comprises a CO 2- absorption device in communication with the waterproof and breathable membrane.

[0027] The beneficial effect of adopting the further technical scheme is that the carbon dioxide removal container is arranged to prevent carbon dioxide from entering the positive electrolyte to generate carbonate ions, which will affect the efficiency of the catalyst and cause the catalyst to be poisoned.

[0028] Further, the CO 2- The absorption device is internally provided with an alkaline substance.

[0029] Further, the gas pump is connected to the CO 2- The absorption device is connected to the positive container.

[0030] Further, the gas pump is connected to the driving power source.

[0031] Further, the driving power source includes an external power source.

[0032] Further, the driving power source is an external power source and an air cell including the positive electrode.

[0033] Further, the air cell positive electrode further includes a current collecting metal frame, which is arranged in the positive container cavity and connected between the positive electrode lead-out wire and the positive electrode body.

[0034] The beneficial effect of adopting the further technical scheme is that the current collecting metal frame is arranged to guide the electrons out, which can accelerate the conduction rate.

[0035] Further, the material of the current collecting metal frame is Cu. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 A sectional view of a positive electrode of an air cell according to Embodiment 1;

[0037] Figure 2 A structural view of a positive electrode of an air cell according to Embodiment 1;

[0038] Figure 3 A structural view of a positive container according to Embodiment 1;

[0039] Figure 4 A Figure 3 A bottom view of a positive container cavity;

[0040] Figure 5 A structural view of a positive container according to Embodiment 1;

[0041] Figure 6 A Figure 5 A bottom view of a closure;

[0042] Figure 7 A structural view of a positive electrode of an air cell according to Embodiment 1;

[0043] Figure 8Figure 2 is a structural diagram of the positive electrode;

[0044] Wherein, the positive electrode-A, negative electrode-B, positive electrode container-1, positive electrode container cavity-101, the first cavity-1011, the second cavity-1012, gas pump-2, CO2 absorption device-3, external power supply-4, alkaline substances-301, start switch-5, positive electrode body-6, positive electrode-601, electrolyte-7, positive electrode lead-8, collector metal frame-9, closure-10, waterproof breathable membrane-1001, gas cavity-1002, closure body-1003, through hole-10031, air pipe-1004, current sensor-11. DETAILED DESCRIPTION

[0045] The principles and features of the present application are described below in conjunction with the accompanying drawings, which are only used to explain the present application and not intended to limit the scope of the present application.

[0046] Example 1

[0047] The present embodiment provides a kind of air cell positive electrode A, as shown in Figure 1 ,

[0048] Including: positive electrode container 1, positive electrode container 1 includes positive electrode container cavity 101 and the first cavity 1011 and the second cavity 1012 of communication with positive electrode container cavity 101, the first cavity 1011 is closed using closure 10 including waterproof breathable membrane 1001, gas enters the first cavity 1011 from waterproof breathable membrane, positive electrode container cavity 101 is filled with electrolyte 7, in the present embodiment, the material of waterproof breathable membrane 1001 is prepared using polytetrafluoroethylene material.Filled in positive electrode container cavity 101 positive electrode body 6, positive electrode body 6 is made of several positive electrode sub-body 601 of filament, the structure of each positive electrode sub-body can be consistent from the second cavity 1012, positive electrode body 6 is communicated with positive electrode lead 8, and one end of positive electrode lead 8 is placed outside positive electrode container cavity 101;

[0049] In the present embodiment, the positive electrode A can be reduced with oxygen as raw material, and the specific reaction formula is as shown in formula I, under the premise of meeting the basic reaction, the positive electrode material and electrolyte raw material are not limited, and are known components in the art, in the present embodiment, the electrolyte can be lye (NaOH, KOH).

[0050] The reaction formula carried out in the positive electrode is:

[0051]

[0052] Formula I

[0053] To reduce subsequent assembly procedures, OH -The anion exchange membrane 1013 is installed at the second cavity port 1012. The anion exchange membrane 1013 can also be assembled for subsequent use.

[0054] To further increase the diffusion rate of gas in the positive electrode container cavity 101, such as Figures 2-6 As shown, air pump 2 is an electric air pump, started by a drive power supply. It can be powered entirely by an external power supply, or it can be a combination of an external power supply and an internal power supply. In this embodiment, the internal power supply containing the negative electrode B and the positive electrode A in this embodiment, together with the external power supply 4, are used as the drive power supply for air pump 2. In this embodiment, the lithium battery is used as the external power supply 4, and its specific connection method is as follows:

[0055] The air pump 2 is connected to the external power supply 4 and the battery containing the positive electrode of this embodiment. A start switch 5 is set in the connection path with the external power supply, and a current sensor 11 is set in the connection path with the battery containing the positive electrode A of this embodiment. The current sensor 11 is connected to the start switch 5. The power required by the air pump 2 is much less than the power supply of the battery containing the positive electrode of this embodiment.

[0056] Among them, the negative electrode B is made of metal and together with the positive electrode A, they form an electrochemical reaction.

[0057] In this embodiment, the reaction occurring at the negative electrode B is as follows:

[0058] Al-3e→Al 3+

[0059] Al 3+ +4OH - →AlO2 - +2H2O;

[0060] Based on the above reaction mechanism, the negative electrode structure and negative electrode electrolyte are conventional choices in this field.

[0061] like Figures 3-4 As shown, in this embodiment, an air pump 2 is used to pressurize gas into the positive electrode container cavity 101. Specifically, the sealing member 10 is composed of a gas cavity 1002 and a waterproof and breathable membrane 1001. The waterproof and breathable membrane seals the entire cavity opening. The gas cavity is placed below the waterproof and breathable membrane. The outer layer of the gas cavity 1002 is provided with through holes (not shown in the figure). The air pump 2 is connected to the gas cavity 1002.

[0062] Or, such as Figures 5-6 As shown, the sealing component 10 is composed of a sealing component body 1003 and a waterproof and breathable membrane 1001. The sealing component body has several through holes 10031, and the waterproof and breathable membrane is located at the through holes. The through holes 10031 are connected to the air pump 2 by a vent pipe 1004.

[0063] In this embodiment, the positive electrode sub-body 601 is not adhered as much as possible to ensure the dispersion of the reaction gas in the positive electrode container cavity. In order to improve the reaction speed, the positive electrode sub-body 601 is provided with a three-layer structure, as shown in Figure 8 , from inside to outside, including a conductive base body 6011, a catalyst-loaded layer 6012, and an electrode metal catalytic layer 6013. More specifically, the conductive base body is made of high-conductivity material, the electrode metal catalytic layer is mainly made of Ag material, and the catalyst-loaded layer is made of graphitized activated carbon as the supporting material, and loaded with MnO2, elemental nano-silver powder, and other materials.

[0064] In order to further increase the loading surface area of the catalyst and the electrode metal catalyst, in this embodiment, the positive electrode sub-body 601 can be a curved wire structure.

[0065] As shown in Figure 7 , in this embodiment, the gas inlet end of the gas pump 2 is connected to the CO2 absorption device 3, which is internally provided with an alkaline substance 301 (NaOH, KOH, etc.). The gas entering the positive electrode container cavity 101 for reaction is first removed of CO2 to avoid entering the electrolyte to generate carbonate and cause catalyst poisoning.

[0066] In order to further accelerate the conduction speed, in this embodiment, a current collecting metal frame 9 is arranged in the positive electrode container cavity 101, and the positive electrode lead 8 is connected to the current collecting metal frame 9. Further, the current collecting metal frame 9 is made of Cu material.

[0067] The use method of the air cell positive electrode of this embodiment is as follows: connect the external power supply 4 to the gas pump 2 passage, so that the gas passes through the gas cavity 1002 and enters the positive electrode container cavity 101. The oxygen in the air is dispersed into the electrolyte 7 for positive electrode reaction. When the current sensor 11 senses that the current reaches a predetermined value, the starting switch is turned off, and the power supply is connected to the gas pump 2.

[0068] The above devices are all existing equipment and can be purchased on the market.

[0069] Comparative Example 1

[0070] The catalyst-loaded layer made of the same material as in Example 1 is coated with Ag of the same thickness as in Example 1 on the surface and directly filled into the positive electrode container as shown in Figure 1 . The volume of the entire catalyst is 1 dm 3 , and the electrolyte in the container and the connected negative electrode are the same as in Example 1.

[0071] Example 3

[0072] The positive electrode as shown in Figure 1 , the positive electrode as shown in Figure 2 , and the positive electrode as shown in Figure 3The positive electrode and the electrode of the comparative example 1 were subjected to discharge voltage test, wherein, compared with Figure 1 the negative electrode of the structure of the comparative example 1 Figure 2 and the negative electrode of the structure of the comparative example 1 Figure 7 The catalyst volume in the above positive electrode structure was 1 dm 3 , and the rest conditions were consistent, the discharge voltage and the peak power after 7 days of continuous use were counted.

[0073] The test results are shown in Table 1.

[0074] Table 1 Discharge voltage test results

[0075]

[0076] As can be seen from Table 1, compared with the comparative example 1, the discharge voltage of the positive electrode with the wire as the main body in the example 1 is obviously higher than that of the ordinary filled positive electrode structure battery.

[0077] At the same time, the research team of the applicant further increases the diffusion rate of the gas by using the air pump, which is also crucial for further improving the discharge voltage.

[0078] And using the CO2 absorption device to absorb CO2 in the air can prevent catalyst poisoning, further improve the catalytic efficiency, and also promote the improvement of the discharge voltage.

[0079] The above only describes the preferred embodiments of the present application, and does not limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An air cell cathode, characterized by comprising: The air cell positive electrode comprises: a positive electrode container comprising a positive electrode container cavity and a first cavity opening and a second cavity opening in communication with the positive electrode container cavity, the first cavity opening being closed by a closure comprising a waterproof gas permeable film through which gas enters the first cavity opening; a positive electrode body filled in the positive electrode container cavity, the positive electrode body being composed of a plurality of filamentous positive electrode sub-bodies and being extractable from the second cavity opening; an electrolyte filled in the positive electrode container cavity; and a positive electrode lead in communication with the positive electrode body, one end of the positive electrode lead being placed outside the positive electrode container cavity; wherein the positive electrode sub-bodies of the positive electrode body are separated from each other; the air cell positive electrode further comprises a gas pump connected to the waterproof gas permeable film. The air cell positive electrode further comprises a CO2 absorption device in communication with the waterproof gas permeable film.

2. The air cell cathode according to claim 1, wherein The gas pump is connected between the CO2 absorption device and the positive electrode container.

3. The air cell cathode according to claim 2, wherein The positive electrode sub-body comprises an electrically conductive base and an electrode metal catalytic layer covering the electrically conductive base.

4. The air cell cathode according to any one of claims 1 to 3, characterized by The electrically conductive base and the electrode metal catalytic layer further comprise a supported catalyst layer, the supported catalyst layer being supported by graphitized activated carbon or graphene, and supporting one or more of manganese dioxide, elemental nanosilver powder, perovskite cobalt oxide or platinum.

5. The air cell cathode according to claim 4, wherein The gas pump is connected to a driving power source.

6. The air cell cathode according to claim 1, wherein The material of the electrode metal catalytic layer is Ag.

7. The air cell cathode according to claim 4, wherein The air cell positive electrode further comprises a current collecting metal frame, the current collecting metal frame being inside the positive electrode container cavity and connected between the positive electrode lead and the positive electrode body.

8. The air cell cathode according to claim 1, wherein The material of the current collecting metal frame is Cu.

9. The air cell cathode according to claim 8, wherein ​

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