A new high-voltage calcium intercalation host for ultra-stable and high-power calcium rechargeable batteries

Abstract Rechargeable calcium batteries have attracted increasing attention as promising multivalent ion battery systems due to the high abundance of calcium. However, the development has been hampered by the lack of suitable cathodes to accommodate the large and divalent Ca 2+ ions at a high redox potential with sufficiently fast ionic conduction. Herein, we report a new intercalation host which presents 500 cycles with a capacity retention of 90% and a remarkable power capability at ~3.2 V (vs. Ca/Ca 2+ ) in a calcium battery. The cathode material derived from Na 0.5 VPO 4.8 F 0.7 is demonstrated to reversibly accommodate a large amount of Ca 2+ ions, forming a series of Ca x Na 0.5 VPO 4.8 F 0.7 (0 < x < 0.5) phases without any noticeable structural degradation. The robust framework enables one of the smallest volume changes (1.4%) and the lowest diffusion barriers for Ca 2+ among the…