title: Local structure of vanadium in doped LiFePO4.
abstract: 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.
authors: Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
authors: Ting
authors: T
authors: Zhao
authors: Wei
authors: W
authors: Xu
authors: Qing
authors: Q
authors: Ye
authors: Jie
authors: J
authors: Cheng
authors: Haifeng
authors: H
authors: Zhao
authors: Ziyu
authors: Z
authors: Wu
authors: Dingguo
authors: D
authors: Xia
authors: Wangsheng
authors: W
authors: Chu