Title : Development of ultrafine grained Al Zn In alloy for high performance Al air battery anode
Aluminum-air battery with a high theoretical energy density is one of the strong candidates as alternative battery for electric vehicles because it is recyclable, environmentally friendly, inexpensive, and abundant. However, the limitations of aluminum-air battery are a high self-corrosion rate in alkaline solution, and its open-circuit potential is lost significantly during anodic polarization due to the presence of an oxide film on the surface. Alloying and grain refinement can improve those properties. This research will present the development of high-performance aluminum alloy anode by a reduction of grain size using equal channel angular pressing (ECAP) and additions of zinc and indium. The potentiodynamic polarization, electrochemical impedance spectroscopy, and self-corrosion test were carried out to study those effects in a 4 molar sodium hydroxide solution. The results showed that ultrafine-grained Al-Zn-In had higher utilization, capacity density, energy density, and voltage than coarse-grained Al-Zn-In and coarse-grained pure Al, respectively because the addition of zinc improved the stability of ion dissolution with the growth of corrosion product film of zinc. An addition of indium promoted electrochemical activities. Moreover, ECAP increased grain boundaries through grain size reduction, causing more negative potential and a uniformly corroded surface of the Al-Zn-In anode.
What will audience learn from your presentation?
- The audience will learn an innovative technology for the development of high-performance aluminum-air battery.
- The audience will realize the effect of grain size on anode performance.
- The audience will realize the effect of the addition of zinc and indium on enhanced anode performance.
- This presentation shows an alternative battery for use in electric vehicles in the future.