Lithium hexaoxo antimonate as an anode for lithium-ion battery

The aims of this study were to synthesize lithium hexaoxo antimonate (Li7SbO6) by a solid-state method with thermal treatment at 700 degrees C in a stream of dry oxygen and to investigate its electrochemical properties as an anode in lithiumion coin cells. X-ray powder diffraction analyses confirm a rhombohedral crystal structure with lattice parameters of a = b = 0 center dot 5411 nm and c = 1 center dot 5030 nm. Li7SbO6 is electrochemically active with lithium intercalation and deintercalation potentials of approximate to 0 center dot 8 and 1 center dot 0 V against Li/Li+, respectively. While the initial reversible capacity is low (66 mA h g(-1) at 0 center dot 05 mA cm(-2)), an excellent rate performance with no significant fading has been observed up to 100 continuous cycles. Even at very high rates of 5 mA cm(-2) (37 C) and 10 mA cm(-2) (106 C), 51% and 48% of capacity is retained, with nearly 100% Coulombic efficiency demonstrating the potential of this material for high-rate applications.