Insights into the Mixed Oxide Thin Film Cathodes of LiCoO2, LiMn2O4 and TiO2 Deposited from Powder Target

Abstract

The present work describes the preparation of mixed oxide powder target of LiCoO2, LiMn2O4 and preparation of thin films. Electrochemical investigations have been carried out in the potential range 2.0–4.3 V with respect to Li. There after TiO2 mesoporous (2–50 nm) powder was also added to the above composition and deposited thin films. XRD, XPS and electrochemical characterisation have been carried out for thin film cathodes. The potential window as well as discharge capacity enhanced after TiO2 doping to the mixed oxide target of LiCoO2 and LiMn2O4. Electrochemical characterization have been carried out in potential range 1.4–4.5 V, delivered a discharge capacity of 137 μAh μm−1 cm−2. The deposited cathode thin films will be a good choice as electrodes for high voltage solid state batteries.