Abstract
Future electric aircraft will be enabled by technologies for safe and high specific energy batteries. Solid-state batteries with non-flammable solid electrolyte are much safer than conventional lithium ion batteries with organic solvent-based liquid electrolytes. Lithium-sulfur (Li-S) chemistry is among the highest specific energy storage platforms. Therefore, it has been suggested that the all-solid-state Li-S system is a top candidate for aviation batteries. However, the challenges start with all components of the battery cells, such as the non-conductive sulfur as the cathode active material, low conductivity and poor stability of the solid electrolyte, and the lithium–solid electrolyte interface roughened with battery reactions. In addition, even after successful development of the cell components, further challenges begin with the scale up of individual component for larger format pouch cells, such as preparing large area cathode and solid electrolyte films and non-conventional pouch fabrication processes. In this presentation, we discuss our recent progress regarding the entire all-solid-state Li-S battery system, from cell component optimization to scale-up fabrication for pouch cells. Performance metrics of these high specific energy cells will be presented and perspectives for future aviation batteries will be provided.
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