Open AccessLocal structure of vanadium in doped LiFePO 4
Author(s) -
Zhao Ting,
Xu Wei,
Ye Qing,
Cheng Jie,
Zhao Haifeng,
Wu Ziyu,
Xia Dingguo,
Chu Wangsheng
Publication year - 2010
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049510025434
Subject(s) - vanadium , doping , crystal structure , materials science , dopant , oxidation state , inorganic chemistry , crystallography , chemistry , metal , metallurgy , optoelectronics
LiFePO 4 composites with 5 at.% vanadium doping are prepared by solid state reactions. X‐ray absorption fine‐structure spectroscopy is used as a novel technique to identify vanadium sites. Both experimental analyses and theoretical simulations show that vanadium does not enter into the LiFePO 4 crystal lattice. When the vanadium concentration is lower then 1 at.%, the dopant remains insoluble. Thus, a single‐phase vanadium‐doped LiFePO 4 cannot be formed and the improved electrochemical properties of vanadium‐doped LiFePO 4 previously reported cannot be associated with crystal structure changes of the LiFePO 4 via vanadium doping.