CN216719998U - Air electrode with double-layer diffusion layer - Google Patents
Air electrode with double-layer diffusion layer Download PDFInfo
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- CN216719998U CN216719998U CN202120532370.5U CN202120532370U CN216719998U CN 216719998 U CN216719998 U CN 216719998U CN 202120532370 U CN202120532370 U CN 202120532370U CN 216719998 U CN216719998 U CN 216719998U
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Abstract
The utility model discloses an air electrode with a double-layer diffusion layer, which sequentially comprises a polytetrafluoroethylene film layer, a polytetrafluoroethylene/conductive agent film layer and a metal mesh of a charging current collector from bottom to top. The air electrode with the double-layer diffusion layer has high hydrophobicity, can resist alkali liquor and has low interfacial resistance, so that the corresponding air electrode has a stable structure, can be used in a rechargeable zinc-air battery, can ensure the service life of the battery, stabilizes the cycle efficiency and can meet the use requirements of the increasingly developed rechargeable zinc-air battery.
Description
Technical Field
The utility model relates to an air electrode with a double-layer diffusion layer, and belongs to the technical field of new energy storage.
Background
Along with the rapid development of economy, the demand of people for various power sources is also increasing. Therefore, the development of high specific energy and clean and safe energy storage batteries is an important requirement for social development. The zinc-air battery has high specific energy density (the theoretical energy density is 1350 Wh/kg)-1) And the safety performance is good, and the material price is low, so the device has wide attention in the directions of large-scale energy storage, efficient electric energy conversion and the like. The rechargeable zinc-air battery has great application potential as a low-cost green sustainable energy source. The rechargeable zinc-air battery mainly comprises an air anode, a zinc cathode and electrolyte. The air electrode mainly comprises a diffusion layer, a catalyst layer and a current collector, and oxygen in the air is used as a positive electrode reaction active substance to respectively generate oxygen reduction and oxygen precipitation reactions in the charging and discharging processes. The air electrode layer needs to realize gas phase (oxygen) and liquid phase (electrolyte) conduction, and meets the three-phase (gas-liquid-solid) electrochemical reaction process. Therefore, the preparation of the air electrode is particularly important for the development of the chargeable and dischargeable zinc-air battery, wherein the air diffusion layer provides a diffusion channel for oxygen and plays a role of preventing liquid leakage, and the electrocatalyst is loaded on the surfaces of the diffusion layer and the current collector, so that the diffusion layer is connectedThe structure has a large influence on the redox reaction.
At present, the most widely used zinc-air battery diffusion layer is a membrane material prepared from polytetrafluoroethylene, and the membrane material is alkali-resistant and has better water resistance. However, polytetrafluoroethylene is not electrically conductive, and when an electrocatalyst is loaded on the surface thereof, polarization resistance is large, thereby affecting the cell performance. If the conductive material is added, the structure of the polytetrafluoroethylene membrane is damaged, and the water resistance of the diffusion layer is affected. Therefore, it is necessary to develop a diffusion layer with high hydrophobicity, alkali-resistant liquid, low interfacial resistance and corresponding air electrode to meet the growing use requirements of rechargeable zinc-air batteries.
Disclosure of Invention
The technical problem solved by the utility model is as follows: the diffusion layer of the existing air electrode can not simultaneously give consideration to high hydrophobicity and alkali-resistant liquid, and can ensure sufficient gas diffusion and passing and low interface resistance.
In order to solve the technical problem, the utility model provides an air electrode with a double-layer diffusion layer, which sequentially comprises a polytetrafluoroethylene film layer, a polytetrafluoroethylene/conductive agent film layer and a metal mesh serving as a current collector from bottom to top.
Preferably, the metal mesh is provided with a catalyst.
Preferably, the conductive agent in the polytetrafluoroethylene/conductive agent thin film layer includes at least one of acetylene black, carbon fiber, carbon nanotube, graphite, and graphene.
Preferably, the metal mesh is a nickel mesh.
Preferably, the thicknesses of the polytetrafluoroethylene film layer, the polytetrafluoroethylene/conductive agent film layer and the metal net are all 0.1-0.4 mm.
Compared with the prior art, the utility model has the following beneficial effects:
the air electrode with the double-layer diffusion layer has high hydrophobicity and good mechanical strength, can ensure sufficient oxygen to diffuse and pass, has the advantages of good conductivity, small resistance and the like of the diffusion layer, and has good application prospect in the related fields of electrocatalysis and secondary zinc-air batteries.
Drawings
FIG. 1 is a schematic structural diagram of an air electrode with a double-layered diffusion layer according to the present invention;
FIG. 2 is a scanning electron microscope topography of a double-layer diffusion layer in an air electrode with the double-layer diffusion layer according to the present invention, wherein A is a scanning electron microscope topography of a polytetrafluoroethylene/conductive agent thin film layer, and B is a scanning electron microscope topography of the polytetrafluoroethylene thin film layer;
fig. 3 is a graph showing the cycle charge and discharge performance of the air electrode having a double diffusion layer according to the present invention in a zinc-air secondary battery.
Detailed Description
In order to make the utility model more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the air electrode with a double-layer diffusion layer has a structure that a polytetrafluoroethylene film layer, a polytetrafluoroethylene/conductive agent film layer and a nickel mesh current collector are sequentially arranged from bottom to top; the polytetrafluoroethylene film layer and the polytetrafluoroethylene/conductive agent film layer form a double-layer diffusion layer, the polytetrafluoroethylene/conductive agent film layer is a film made of polytetrafluoroethylene and any one conductive agent, and the conductive agent comprises any one or mixture of acetylene black, carbon fibers, carbon nanotubes, graphite and graphene.
FIG. 2 is a scanning electron microscope topography of a double-layer diffusion layer, which is characterized by a microstructure of the double-layer diffusion layer using a field emission electron microscope. Under a high power electron microscope, the polytetrafluoroethylene/conductive agent thin film layer close to the catalyst side has a large porosity as shown in fig. 2A, so that the conductive agent therein can be ensured to exert a good conductive effect, and the polytetrafluoroethylene thin film layer close to the air side has a low porosity as shown in fig. 2B, so that good water resistance can be ensured.
And (3) performance testing:
the air electrode with a single-layer polytetrafluoroethylene film diffusion layer is used as a comparison to test the application of the air electrode with a double-layer diffusion layer in a zinc-air secondary batteryElectrochemical performance, measured at constant current, with a charging current density of 5mA cm-2And charging for 5min, then performing a discharge test at the same current density for 5min, and performing a cyclic charge-discharge test under the condition to obtain a cyclic charge-discharge performance curve, wherein the cyclic charge-discharge performance curve of the air electrode with the double-layer diffusion layer is shown in fig. 3, the charging voltage of the first circle of the corresponding battery is about 2.27V, the discharging voltage is about 1.23V, the energy efficiency of the first circle is 54.2%, the stable charge-discharge is kept for 5000 circles, and the energy efficiency of the last circle can still reach 44.5%. Tests show that the first circle of charging voltage of the air electrode with the single-layer polytetrafluoroethylene film diffusion layer corresponding to the air electrode reaches 2.01V, the discharging voltage is about 1.09V, the first circle of energy efficiency is 54.2%, but the charging and discharging cycle only reaches 717 circles, and the last circle of energy efficiency is reduced to 38.2%. The air electrode with the double-layer diffusion layer of the utility model thus exhibits better stability and electrochemical performance. The air electrode with the double-layer diffusion layer has high hydrophobicity, high mechanical strength and good stability, and can ensure sufficient oxygen to diffuse and pass, so that the air electrode can be applied to a zinc-air secondary battery, and the performance and the cycle operation life of the zinc-air battery can be effectively improved.
While the utility model has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model.
Claims (5)
1. The air electrode with the double-layer diffusion layer is characterized by sequentially comprising a polytetrafluoroethylene film layer, a polytetrafluoroethylene/conductive agent film layer and a metal mesh serving as a current collector from bottom to top.
2. The air electrode having a double-layered diffusion layer according to claim 1, wherein the metal mesh is provided with a catalyst.
3. The air electrode having a double-layered diffusion layer according to claim 1, wherein the conductive agent in the polytetrafluoroethylene/conductive agent thin film layer is one of acetylene black, carbon fiber, carbon nanotube, graphite, and graphene.
4. The air electrode having a double-layered diffusion layer according to claim 1, wherein the metal mesh is a nickel mesh.
5. The air electrode with the double-layer diffusion layer according to claim 1, wherein the polytetrafluoroethylene film layer, the polytetrafluoroethylene/conductive agent film layer and the metal mesh are all 0.1-0.4 mm thick.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120532370.5U CN216719998U (en) | 2021-03-15 | 2021-03-15 | Air electrode with double-layer diffusion layer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120532370.5U CN216719998U (en) | 2021-03-15 | 2021-03-15 | Air electrode with double-layer diffusion layer |
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| CN216719998U true CN216719998U (en) | 2022-06-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112952109A (en) * | 2021-03-15 | 2021-06-11 | 上海簇睿低碳能源技术有限公司 | Air electrode with double-layer diffusion layer and preparation method and application thereof |
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2021
- 2021-03-15 CN CN202120532370.5U patent/CN216719998U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112952109A (en) * | 2021-03-15 | 2021-06-11 | 上海簇睿低碳能源技术有限公司 | Air electrode with double-layer diffusion layer and preparation method and application thereof |
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| TR01 | Transfer of patent right |
Effective date of registration: 20221010 Address after: 201600 room 506, 5th floor, building 11, 300 Dingyuan Road, Songjiang District, Shanghai Patentee after: Shanghai cluster Rui Low Carbon Energy Technology Co.,Ltd. Patentee after: Shanghai lanze Energy Technology Co.,Ltd. Address before: 201600 room 506, 5th floor, building 11, 300 Dingyuan Road, Songjiang District, Shanghai Patentee before: Shanghai cluster Rui Low Carbon Energy Technology Co.,Ltd. Patentee before: SHANGHAI ADVANCED Research Institute CHINESE ACADEMY OF SCIENCES |
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| TR01 | Transfer of patent right |