Synthesis and Electrochemical Properties of Doped Tin Fe2(MoO4)3 as Cathode Material for Sodium-Ion Batteries

Fe 2-x Sn x (MoO 4 ) 3 samples were successfully synthesized by wet chemical route. The analytical results of X-ray diffractions indicated that the additions of tin have not destroyed the lattice structure of Fe 2-x Sn x (MoO 4 ) 3 , but increased the units cell volume. Fe 2-x Sn x (MoO 4 ) 3 can be exhibited higher discharge /charge capacities and better cycle-stability than the pristine one. At room temperature, the initial discharge capacity of Fe 1.95 Sn 0.05 (MoO 4 ) 3 is 83.12 mAh g -1 at a discharge rate of 0.5 C and remains 78.81 after 50 cycles. The improved electrochemical properties can be explaining with the presence of tin in the lattice of Fe 2 (MoO 4 ) 3 by improved the structure stability and electrical conductivity.