Novel Electrolytes for Use in Li-Air Batteries for NASA Electric Aircraft

Abstract

Li-Air batteries are a unique fit for electric aircraft due to their high theoretical energy densities and their potential to leverage on-board oxygen systems. The electrolyte and cathode are the limiting factors for advancing this technology. We are investigating novel "electrolyte and cathode engineering" concepts to enable Li-Air batteries with high practical energy densities, rechargeability and safety. New stable electrolytes and cathodes are being designed and fabricated for Li-Air batteries. An array of various electrolytes were screened and analyzed using NMR and DEMS analysis techniques to understand the fundamental decomposition mechanisms at the cathode surface and within the porous polymer separator. (NMR) spectroscopy has yielded mechanistic insight into decomposition pathway, which is vital to the development of future stable electrolyte candidates. Thus far, five new electrolytes have been screened with 2 showing promising results