LiFePO4 thin films have been prepared by pulsed laser deposition method on titanium substrates. The influence of the deposition parameters, e.g. substrate temperature, ambient argon pressure, and post-annealing on the crystallinity and morphology of as-deposited thin films are investigated. Well-crystallized pure olivine-phase is obtained under optimized deposition condition (20-30 Pa, 500 degrees C). It shows a high electrochemical activity (83% theoretical capacity) at low current density (0.33 mu A cm(-2), 1/20 C) and elevated testing temperature (45 degrees C). Moderate post-annealing treatment can enhance the utilization of the films further. The deposition of the film at a too high temperature or post-annealing for too long time could introduce Fe impurities, i.e., Li3Fe2(PO4)(3) and Fe-4(P2O7)(3), which can be easily detected by extending the electrochemical test voltage down to 2.5 V. (C) 2009 Elsevier Ltd. All rights reserved.