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Preparation of Mn-doped LiFePO_4 and Studies on Its Electrochemical Behavior

ZHANG Jing,YE Yi-bin,LAI Heng(College of Physics and Energy,Fujian Normal University,Fuzhou 350117,China)  
This paper concentrates on the preparation of the LiFe0.9Mn0.1PO4/C through a simple method,with the Fe(OH)3 as iron source,the C4H6MnO4·4H2O as manganese source and the C12H22O11as reducing agent and carbon sources.The influence of doped manganese on the structure and morphological performances of the LiFe0.9Mn0.1PO4/C composites were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM).At the same time,we also investigated the change of electrochemical characterization of the LiFe0.9Mn0.1PO4/C through charge/discharge experiments at different rate,electrochemical impedance spectroscopy(EIS) and cyclic voltammetry.Result shows that:(1)The obvious change of the structure of LiFePO4 olivine-type is not observed with a small amount of doped Mn2+;(2) Compared with LiFePO4,the main advantages of the LiFe0.9Mn0.1PO4/C are larger charging and discharging capacity,better electrochemical reversibility,better structure stability,and more excellent conductivity performance,etc.
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