Electrochemical Energy Storage Performance of Li2FeP2O7 Thin Film Electrodes for Lithium-ion Thin film batteries

Thin film of Li2FeP2O7 of thickness ~200 nm has been prepared using pulsed laser deposition (PLD) technique.Target for PLD was synthesized using solid-state method (ball milling) to prepare bulk polycrystalline Li2FeP2O7 compound.Grazing incident X-ray diffraction (GIXRD) was used to see the phase-purity and crystallinity of Li2FeP2O7 thin films.Thin film of Li2FeP2O7 cathode was made and the electrochemical activity of Li2FeP2O7 thin film delineates a highly efficient Li + intercalation as well as stable cycling behaviour at different current rates.Li2FeP2O7 deposited over stainless steel (SS) current collectors delivered capacity of 92 mA g - 1 (corresponding areal capacity: 37 mAh cm -2 ) at 5 A g -1 rate with 100 % Coulombic efficiency till 300 cycles.The primary aim of the current study is to aware the scientific community about the possibility of pyrophosphate based polyanionic materials for all solid state Li-ion thin film batteries.