Electrochemical performance of nanocrystalline LiMPO 4 thin-films prepared by electrostatic spray deposition

Abstract

LiMPO 4 (M = Mn, Fe) and LiMn 0.4Fe 0.6PO 4 thin-films have been fabricated by electrostatic spray deposition (ESD) combined with sol–gel method, in which P 2O 5 was used as a phosphorous resource in Li–M–P–O alcohol precursor solution. Analyses of LiMPO 4 solid films using X-ray diffractometry (XRD) and scanning electron microscopy (SEM) demonstrated the formation of an olivine phase of space group Pmnb with nanocrystalline morphology. The prepared LiMPO 4 films were evaluated electrochemically by cyclic-voltammetry and charge/discharge measurements. The results showed that thin-film electrode of LiMn 0.4Fe 0.6PO 4 exhibited better electrochemical performance than that of pure LiFePO 4 and LiMnPO 4.