Effects of Mg Ion Doping on the Electrochemical Performances and Structure of LiFePO4 /C

doi:10.3724/SP.J.1077.2007.00627

Abstract

Abstract:

Stoichiometric Mg doped LiFePO₄/C cathode material was synthesized through a templatesolid state reaction in an inert atmosphere using magnesium lactate as dopant and part of carbon source. Effects of Mg²⁺ doping on the electrochemical and physical performances of the cathode materials were investigated. At 1/3C discharge rate, the secondly reversible specific capacity of the Mg-doped LiFePO₄/C is nearly 20mAh/g higher than that of the undoped one. After 20 cycles, the capacity of the former is 162.1mAh/g, 22mAh/g higher than that of the latter. Impedance R ct of the Mg-doped material is 120Ω, while that of the undoped material is 180Ω. The tap density of Mg-doped material is
also improved by 0.229g·cm^-3 compared with undoped material.

Key words: magnesium lactate, LiFePO4/C, cathode material, doping

CLC Number:

TM912

YANG Shu-Ting,LIU Yu-Xia,YIN Yan-Hong,WANG Hui,CUI Cheng-Wei. Effects of Mg Ion Doping on the Electrochemical Performances and
Structure of LiFePO₄ /C[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2007.00627.

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Effects of Mg Ion Doping on the Electrochemical Performances and
Structure of LiFePO₄ /C

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