Investigation of degradation effects in NASICON Materials for Aqueous Sodium Batteries
Jurgis Pilipavicius
Center for Physical Sciences and Technology, Vilnius, Lithuania
Aqueous sodium batteries offer a promising alternative to organic lithium-ion technology for stationary energy storage due to material abundance, lower manufacturing costs, and improved safety and sustainability. Key materials include open framework structures like Prussian blue analogues and Sodium SuperIonic Conductors (NASICONs), enabling efficient sodium intercalation and deintercalation. This study examines NASICON materials such as NaTi2(PO4)3 (NTP) and Na3V2(PO4)3 (NVP). Our results indicate NTP suffers from rapid capacity decay due to pH increase from oxygen reduction reactions. NVP, although prone to dissolution in aqueous media, shows improved stability when vanadium is partially substituted with titanium. We developed strategies to mitigate degradation, including atomic layer deposition, electrolyte composition engineering, and material structure optimization.