Journal of Inorganic Materials >
Effects of Mg Ion Doping on the Electrochemical Performances and
Structure of LiFePO4 /C
Received date: 2006-08-18
Revised date: 2006-10-23
Online published: 2007-07-20
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
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, 2007
, 22(4)
: 627
-630
.
DOI: 10.3724/SP.J.1077.2007.00627
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