The zinc-air battery holds great promise for the electric vehicle as a low cost, high energy density, safe and ecological battery. The primary zinc-air battery is commercial and mechanically rechargeable alternatives have been demonstrated on a large scale on electric vehicles. However, only the electrically rechargeable zinc-air battery really meets the requirements of the EV. The poor cycling stability of the air electrode has been the main limitation in development of the secondary zinc-air battery. In this configuration, the air electrode is used both as oxygen reduction electrode and an oxygen evolution electrode. Unfortunately, the two functions are very different and require different electrode morphologies and catalysts. An alternative concept has been demonstrated in which the two functions of the oxygen electrode are electrically decoupled in a bi-electrode configuration, which enables each half-electrode to be optimised for their function. The optimised air electrode has an open porous structure which behaves as a 3D electrode. It is composed of a carbon powder which is shaped into a porous electrode using a hydrophobic polymer such as PTFE. A second oxygen evolution electrode is added to the traditional oxygen reduction electrode in the shape of a thin metal grid. To preserve the porous electrode, the oxygen evolution electrode is electrically decoupled during the charge with a simple electronic circuit. This concept has been demonstrated in full cells and has been shown to be stable for more than 1000 hrs to date (the cells are still running). It proves to be a simple and cheap solution for rechargeable metal-air cells which does not compromise its energy density.
Development of an electrically rechargeable zinc air battery for electric vehicles
Entwicklung einer elektrisch wiederaufladbaren Zink-Luft-Batterie für Elektrofahrzeuge
2009
4 Seiten, 6 Bilder, 7 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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