Towards High Power High Energy Aqueous Sodium-Ion Batteries: The NaTi_2(PO)4)_3/Na_(0.44)MnO_2 System

摘要

Concerns over global energy supply have spurred intensive research on energy storage technologies to enable electric vehicles and an electric grid that can utilize renewable energy sources such as wind and solar.Recently, several emerging aqueous energy storage technologies have been demonstrated that feature low cost, high rate capability, and durability. The potential for use in large-scale grid application has revived focus on these systems.Here, we demonstrate ultrafast rate capability (>100C current rates) and superior high-rate cycling stability (>1500 cycles) in aqueous NaTi_2(PO_4)_3/Na_(0.44)MnO_2 (NTP/NMO) cells, an electrochemical couple which has the highest specific and volumetric energy amongst reported aqueous Na-ion systems to date.