Electrochemical properties of novel calcium stannate anode for lithium ion batteries
(1. College of Chemistry and Chemical Engineering, Jishou University,
Jishou 416000, China;
2. School of Chemistry and Chemical Engineering, Central South University,
Changsha 410083, China)
Jishou 416000, China;
2. School of Chemistry and Chemical Engineering, Central South University,
Changsha 410083, China)
Abstract: CaSnO3 with the perovskite structure was prepared by wet-chemical route and the electrochemical properties as anode material for lithium ion batteries were studied. The results show that the uniform nano-crystallites (about 200nm) of CaSnO3 are obtained and a reversible capacity of 460mA•h•g-1 (0-1.0V, 0.1C) with good cycling stability is delivered (the capacity loss per cycle is only 0.09%).The observed capacity involved in the first discharge and the reversible capacity during subsequent charge-discharge cycles shows that the electrochemical process in CaSnO3 is similar to other Sn-based oxide materials, namely, an initial structural reduction with Sn-metal formation followed by reversible Li-Sn alloy formation. Both the attainable capacity and its retention on charge-discharge cycling are better than the previously reported best-performing bulk Sn-oxide or ATCO materials, which indicates that the perovskite structure and Ca-ion may play a beneficial role.
Key words: lithium ion batteries; CaSnO3; wet chemical route; anode