High-Performance Solid-State Li Metal Batteries Based on a Solid Polymer Electrolyte

Abstract

Over the past decades, lithium-ion batteries (LIBs) have garnered considerable attention, emerging as the foremost commercial battery technology. Widely employed in portable electronics, electric vehicles, and energy storage stations, LIBs face challenges including safety concerns and low energy densities, prompting extensive research into next-generation battery technologies. Solid-state batteries are recognized as one of the most promising alternatives to conventional LIBs. Polymer-based solid-state electrolytes have garnered extensive attention for their softness and flexibility, offering relief from interface issues between electrodes and separators in contrast to inorganic solid electrolytes. Nonetheless, their drawbacks, including limited Li+ conductivity or narrow electrochemical windows (< 4 V), constrain their potential applications. This presentation introduces a novel solid-state electrolyte (SSE) derived from a new polymer developed by Piersica Inc. (www.piersica.com), tailored for use in all-solid-state lithium metal batteries. The SSE exhibits remarkable conductivity (0.2 mS/cm) at room temperature and exceptional oxidized stability (approximately 4.9 V). When integrated into a solid cathode and lithium metal anode configuration, without the addition of any liquid electrolyte, the resulting solid-state pouch cell (~40 mAh) demonstrates over 90% of theoretical capacity, superior rate performance, and long-term stability (85% retention after 200 cycles) at room temperature. The polymer from Piersica Inc. holds considerable promise for advancing the development and performance of solid-state batteries.