A Nanocrystalline FeO Film Anode Prepared by Pulsed Laser Deposition for Lithium-Ion Batteries.

Nanocrystalline FeO thin films are deposited directly on the conduct substrates by pulsed laser deposition as anode materials for lithium-ion batteries. We demonstrate the well-designed FeO film electrodes are capable of excellent high-rate performance (510 mAh g at high current density of 15,000 mA g) and superior cycling stability (905 mAh g at 100 mA g after 200 cycles), which are among the best reported state-of-the-art FeO anode materials. The outstanding lithium storage performances of the as-synthesized nanocrystalline FeO film are attributed to the advanced nanostructured architecture, which not only provides fast kinetics by the shortened lithium-ion diffusion lengths but also prolongs cycling life by preventing nanosized FeO particle agglomeration. The electrochemical performance results suggest that this novel FeO thin film is a promising anode material for all-solid-state thin film batteries.