Thin film of LiNi0.8Co0.2O2 (LNCO) has been prepared by Pulsed Laser Deposition (PLD) technique at various post annealing temperatures. XRD results of LNCO thin film deposited on both Pt and Si substrates reveal relatively good crystalline nature at 500 degrees C which is in good agreement with the electrochemical results. ICP-AES composition analysis indicates 10 to 5% Li loss in the post annealed (400-700 degrees C) LNCO/Pt thin films; however the as prepared LNCO/Pt films show 17% excess of Li which are comparable with the LNCO target results. SEM analysis indicates phase separation at 600 degrees C and porous nature at 700-800 degrees C for LNCO/Pt films. Cyclic voltammetry (CV) scans of LiNi0.8Co0.2O2 film post annealed at 500 degrees C show a pair of main cathodic and anodic peaks at 3.64 and 3.4 V, respectively with a narrow peak separation reveals good stability upon cycling. Whereas the LNCO films annealed at 600 degrees C and 700 degrees C indicate an additional anodic peak at lower potential besides a pair of major peaks which may be due to the phase separated morphology as evidenced from SEM analysis. Based on the structural and electrochemical results, a lithium-ion micro cell has been constructed with LNCO/Li3.4V0.6Si0.4O4(LVSO)/SnO configuration with the thickness of 1.535 mu m and its electrochemical properties have been studied. (C) 2008 Elsevier B.V. All rights reserved.