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Sol-gel synthesis of aliovalent vanadium-doped LiNi0.5Mn 1.5O4 cathodes with excellent performance at high temperatures

Cited 43 time in Web of Science Cited 42 time in Scopus
Authors
Kim, Min Chul; Nam, Kyung-Wan; Hu, Enyuan; Yang, Xiao-Qing; Kim, Hyungsub; Kang, Kisuk; Aravindan, Vanchiappan; Kim, Woo-Seong; Lee, Yun-Sung
Issue Date
2014-03
Citation
ChemSusChem, Vol.7 No.3, pp.829-834
Keywords
batterieselectrochemistryhigh-voltage cathodelithiumsol-gel
Abstract
Extraordinary performance at elevated temperature is achieved for high-voltage spinel-phase LiNi0.5Mn1.5O4 cathodes prepared using an adipic-acid-assisted sol-gel technique and doped with vanadium. V-substitution in the Li sites (Wykoff position 8a) is confirmed by VK-edge X-ray absorption spectroscopy and Rietveld refinement (Li0.995V0.005Ni0.5Mn1.5O4). V-doped LiNi0.5Mn1.5O4 delivered a reversible capacity of approximately 130 and 142mAhg(-1) at ambient and elevated temperature conditions, respectively. Furthermore, the Li0.995V0.005Ni0.5Mn1.5O4 phase rendered approximately 94% and 84% of initial capacity compared to approximately 85% and 3% for the LiNi0.5Mn1.5O4 phase after 100 cycles in ambient and elevated temperature conditions, respectively. The enhancements are mainly because of the suppression of Mn dissolution and unwanted side reaction with electrolyte counterpart, and to the increase in conductivity, improving the electrochemical profiles for the V-doped phase.
ISSN
1864-5631
URI
http://hdl.handle.net/10371/165100
DOI
https://doi.org/10.1002/cssc.201301037
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
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