High-Efficiency Sodium-Ion Battery Based on NASICON Electrodes with High Power and Long Lifespan

Sodium-ion batteries hold great promise for grid energy storage owing to their competitive cost advantages. However, challenges remain in the development of suitable electrode materials to enable long lifespan and high power. Herein, we report the scalable synthesis of porous Na 3 V 2 (PO 4 ) 3 and NaTi 2 (PO 4 ) 3 materials together with their electrochemical performance, especially in terms of high rate cycling stability. The NaTi 2 (PO 4 ) 3 //Na 3 V 2 (PO 4 ) 3 cells exhibit not only high power (85 mAh g –1 at 2.4 A g –1 based on cathode), ultralong cycle life (capacity retention of 94% over 5000 cycles), and good energy efficiency (80%), but also simple manufacturability and safety due to the high thermal stability of the phosphate-based cathode and anode materials.