FePO 4 as an anode material to obtain high-performance sodium-based dual-ion batteries.

Herein, the FePO4 material was for the first time proposed to serve as an anode electrode, as an intercalation sodium host, to obtain novel sodium-based dual-ion batteries. And the full cell can present a highly reversible capacity of 120 mA h g-1 in the range of 2-4.2 V and exhibits an excellent initial coulombic efficiency of 99.5%.