Growth of layered Li Ni0.5 Mn0.5 O2 thin films by pulsed laser deposition for application in microbatteries

Abstract

Li Ni0.5 Mn0.5 O2 films were prepared by pulsed laser deposition on stainless steel (SS) and Au substrates. The substrate was found to play an important role in determining the growth of films. Although similar x-ray diffraction spectra were observed for both types of substrates, Raman spectra exhibited different features. The charge-discharge behavior of the film on the SS substrate indicates a spinel structure while the charge-discharge behavior of the film on the Au substrate indicates a layered structure. The secondary ion mass spectrometry depth-profiling results indicate interdiffusion between the film and the substrate, which inhibits the formation of pure layered Li Ni0.5 Mn0.5 O2 phase. © 2008 American Institute of Physics.