Open AccessVanadium Substitution of LiFePO4 Cathode Materials To Enhance the Capacity of LiFePO4-Based Lithium-Ion Batteries
Author(s) -
ChingYu Chiang,
Hui-Chia Su,
Pin-Jiun Wu,
HengJui Liu,
Chih−Wei Hu,
Neeraj Sharma,
Vanessa K. Peterson,
Han-Wei Hsieh,
Yu-Fang Lin,
WuChing Chou,
ChihHao Lee,
JyhFu Lee,
BorYuan Shew
Publication year - 2012
Publication title -
the journal of physical chemistry c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.401
H-Index - 289
eISSN - 1932-7455
pISSN - 1932-7447
DOI - 10.1021/jp307047w
Subject(s) - vanadium , lithium (medication) , materials science , cathode , powder diffraction , conductivity , lithium vanadium phosphate battery , neutron diffraction , diffraction , ion , lithium iron phosphate , chemical engineering , crystal structure , inorganic chemistry , crystallography , chemistry , electrode , anode , electrochemistry , metallurgy , organic chemistry , medicine , engineering , endocrinology , physics , optics
The mechanism of enhancing the capacity of the LiFePO(4) cathodes in lithium ion batteries by the addition of a small amount of vanadium, which locate on the lithium site and induce lithium vacancies in the crystal structure, is reported in this article. As a result, the capacity increases from 138 mAh/g found for pristine LiFePO(4) to 155 mAh/g for the V-added compound, and the conductivity increases from 4.75 x 10(-4) S/cm for the LiFePO(4) without V addition to 1.9 x 10(-2) S/cm for the V-added compound. A possible model to facilitate the enhancement of conductivity and capacity is described with evidence supported by X-ray powder diffraction, X-ray absorption spectroscopy, and neutron powder diffraction data. © 2012, American Chemical Society
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