Electrochemical Properties of MnF_2 Films Fabricated by Pulsed Laser Deposition

Nanostructured MnF2 thin films were fabricated by using pulsed laser deposition on stainless steel substrate at room temperature.The reversible discharge capacities of MnF2 thin film electrode in the ranges from 350mAh/g to 530mAh/g was achieved during the first 50 cycles at the current of 2μA/cm2 from cyclic voltammograms curves of Li/MnF2 cell.Reduction and oxidation peaks at 0.5V and 1.0V were detected which indicated the reversible formation and decomposition of reaction of MnF2.The structure and morphology of the as-deposited films were characterized by X-ray diffraction and scan electronic microscopy.The electrochemical reaction of MnF2 thin film electrode was investigated by the high-resolution transmission electron microscope and selected-area electron diffraction measurements.The results demonstrated that nanosized manganese particles formed in initial discharge process could reversible drive the decomposition and formation of LiF.The low polarization and high capacity of MnF2 thin film show that it is a promising lithium-storage materials for future rechargeable lithium batteries.