Liquid-Free Lithium-Oxygen Battery

Monday, 25 May 2015: 15:00
Continental Room A (Hilton Chicago)
M. Balaish (The Grand Technion Energy Program (GTEP), Technion), E. Peled (Tel Aviv University), D. Golodnitsky (School of Chemistry, Tel Aviv University), and Y. Ein-Eli (The Grand Technion Energy Program (GTEP), Technion, Materials Science and Engineering, Technion)
Non-aqueous Li-O2 batteries are considered as most advanced power sources, albeit they are facing numerous challenges concerning almost each cell component. Herein, we diverge from the conventional and traditional liquid-based non-aqueous Li-O2 batteries to a solid polymer electrolyte (SPE) Li-O2 system, operated at a temperature higher than the melting point of the polymer electrolyte, where useful and most applicable conductivity values are easily achieved. The proposed SPE-based Li-O2 cell is compared to glyme-based Li-O2 cells through potentiodynamic and galvanostatic studies, showing higher cell discharge voltage by 80mV and most significantly, a charge voltage lower by ∼400mV. The solid state battery demonstrated a comparable discharge specific capacity to glyme-based Li-O2 cells when discharged at the same current density. The discharge products were identified as lithium peroxide by XRD analysis and FT-IR combined with quantitative 1H and qualitative 13C NMR spectroscopies identified lower molecular PEO as the main degradation products, as well as in-chain ester and formates in negligible amounts. The results shown here demonstrate that safer PEO-based Li-O2 battery is highly advantageous and can potentially replace liquid-based cells contingent upon further investigation. While safety is a prime concern in Li-metal based battery, it is of greater challenge once a viable Li-O2 battery development is being considered. A polymer-based system, which is liquid electrolyte-free, seems to be another and important step towards resolving this issue.

* Balaish, M., Peled, E., Golodnitsky, D. and Ein-Eli, Y. (2014), Liquid-Free Lithium–Oxygen Batteries. Angew. Chem. Int. Ed.. doi: 10.1002/anie.201408008