FeSe thin film has been successfully fabricated by pulsed laser ablation of mixed target of Fe and Se powder. The structural and electrochemical properties of the as-deposited thin films have been investigated by X-ray diffraction (XRD), the charge/discharge and cyclic voltammetry (CV) measurements. The thin film deposited at 200 ℃ was mainly composed of crystallized FeSe. In the range of 1.0～3.0 V, the reversible discharge capacities was 360.8 mAh•g^－1. After 100 cycles, the discharge capacity was 396.5 mAh• g^－1, indicating a stable cycle performance. Ex situ XRD results showed that FeSe could react with Li reversibly. Nanosized metal iron whose crystal size was more than 5 nm could also drive the decomposition of Li₂Se and reform FeSe after charging to 3.0 V. Owing to its high reversible capacity and good cycle ability, FeSe was demonstrated to be a promising cathode material for future rechargeable lithium batteries.

Key words: FeSe, pulsed laser deposition, thin film, electrochemistry