(Li0.5La0.5)TiO3 (LLTO) film electrolytes for use in a lithium rechargeable microbattery were prepared on a Pt collector using pulsed laser deposition (PLD) at various deposition temperatures. As-grown 360 nm thick LLTO films prepared at 400-600degreesC showed an amorphous phase and an ionic conductivity of similar to2.0 x 10(-5) Scm(-1) at room temperature. A lithium metal anode in contact with the amorphous LLTO films had no influence on the electronic conductivity of the LLTO solid-electrolyte, contrary to crystalline films. The retention capacity of the LLTO/100 nm thick LiCoO2/Pt cells during 100 cycles in a 1 M LiClO4 liquid electrolyte in propylene carbonate (PC) was similar to82.2% and the cells exhibited an increase of similar to30% compared with that for LiCoO2/Pt cells. The LLTO/LiCoO2/Pt cells had excellent rechargeability characteristies of similar to63% up to 300 cycles. (C) 2004 The Electrochemical Society.