Open AccessPreparation and characterization of positive materials LiMn1-xFexPO4(0x<1) for lithium ion batteries
Author(s) -
彭薇,
岳敏,
梁奇,
胡社军,
侯贤华
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.038202
Subject(s) - electrochemistry , materials science , faraday efficiency , lithium (medication) , scanning electron microscope , cathode , battery (electricity) , lithium ion battery , ion , diffraction , chemical engineering , particle size , phase (matter) , electrode , particle (ecology) , analytical chemistry (journal) , composite material , chemistry , organic chemistry , thermodynamics , medicine , power (physics) , physics , oceanography , engineering , geology , optics , endocrinology
In this study, a series of phase-pure LiMn1-xFexPO4/C (x=0.2, 0.4, 0.6) cathode materials were successfully synthesized by solid-state method. The structure, particle size, surface morphology and electrochemical properties of these cathode active materials were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), electrochemical model cell and cyclic voltammograms (CV). The results indicated that the different atom ratio of Mn/Fe affected its electrochemical preformance. A lithium battery using LiMn0.6Fe0.4PO4 as the active materials of the positive electrode exhibits a high initial charge capacity and discharge capacity of 141.5 mAh g-1 and 125.7 mAh g-1, respectively, and the initial coulombic efficiency is 88.8. After 25 cycles, it retains 99.8% of the initial discharge capacity at 0.2C rate, showing perfect cyclic property.