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Sn doped ZnFe2O4 samples were prepared by co-precipitation method. It is found that with the increase of Sn content, the phase structure of the prepared samples transformed from single-phase spinel ZnFe2O4 to two-phase ZnFe2O4/SnO2 composite and the particle size of samples decreased; The Sn doped ZnFe2O4 (with Sn/Fe ratio of 0.05) exhibited the best lithium storage performance among the four samples. For example, after 300 cycles at 1000 mA g−1, the Sn doped ZnFe2O4 (with Sn/Fe ratio of 0.05) delivered a reversible capacity of 1163 mA h g−1, much higher than that (715 mA h g−1) of the undoped ZnFe2O4. [ABSTRACT FROM AUTHOR]

The influence of Sn doping on the geometric and electronic structures of V2O5 were investigated by the plane-wave pseudopotential technique based on density functional theory (DFT) with LDA/CA-PZ functional. After Sn doping, the unit cell volume of V2O5 increases slightly and the system changes from intrinsic semiconductor to n-type semiconductor. In the Sn doped V2O5, the V-O bonds show a significant covalent bond character, while the Sn-O bonds exhibits mainly ionic bond character; the V = O bonds from the vanadium and terminal oxygen have the strongest bond strength among all the V-O bonds in the system; in addition, the bond strength of the terminal/apical V-O bonds adjacent to Sn atom weakens obviously. [ABSTRACT FROM AUTHOR]

The influence of Sn doping on the geometric and electronic structures of V2O5 were investigated by the plane-wave pseudopotential technique based on density functional theory (DFT) with LDA/CA-PZ functional. After Sn doping, the unit cell volume of V2O5 increases slightly and the system changes from intrinsic semiconductor to n-type semiconductor. In the Sn doped V2O5, the V-O bonds show a significant covalent bond character, while the Sn-O bonds exhibits mainly ionic bond character; the V = O bonds from the vanadium and terminal oxygen have the strongest bond strength among all the V-O bonds in the system; in addition, the bond strength of the terminal/apical V-O bonds adjacent to Sn atom weakens obviously. [ABSTRACT FROM AUTHOR]