Fe2(MoO4)3/Nanosilver Composite as a Cathode for Sodium-Ion Batteries

The precursor of Fe2(MoO4)3 has been synthesized by precipitation method, which is used to prepare high-capacity cathode material Fe2(MoO4)3/nanosilver composite for sodium-ion batteries. The silver modifying does not affect the monoclinic structure of Fe2(MoO4)3 but improves its kinetics in terms of discharge capacity and rate capability. AC impedance measurements show that the Ag modification decreases the charge transfer resistance of Fe2(MoO4)3/nanosilver composite cathodes. Electrochemical studies confirm that the Fe2(MoO4)3/nanosilver composite exhibits capacity of 90 mAhg−1, and retains 84.5 % of capacity even after 50 cycles.