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http://dx.doi.org/10.5757/JKVS.2011.20.3.205

Fabrication of LiMn2O4 Thin-Film Rechargeable Batteries by Sol-Gel Method and Their Electrochemical Properties  

Lee, J.H. (Department of Physics, Konkuk University)
Kim, K.J. (Department of Physics, Konkuk University)
Publication Information
Journal of the Korean Vacuum Society / v.20, no.3, 2011 , pp. 205-210 More about this Journal
Abstract
Structural and electrochemical properties of spinel oxide $LiMn_2O_4$ thin films prepared by using a sol-gel method on Pt/Ti/$SiO_2$/Si substrates were investigated. When Li/Mn molar ratio of the film was smaller than 0.5, $Mn_2O_3$hase was found to coexist with $LiMn_2O_4$. Half-cell batteries fabricated using the $LiMn_2O_4$ films as the cathode were put into chargedischarge (C-D) cycles and the change in structural properties of the cathode after the cycles was examined by X-ray diffraction and Raman spectroscopy. As the C-D cycle number increases, the discharge capacity of pure $LiMn_2O_4$ battery gradually decreases, being reduced to 72% of the initial capacity at 300 cycles. Such capacity fading is attributable to the decrease in the number of $Li^+$ ions that return to the tetrahedral sites of the spinel structure during the discharge step and the resultant increase in $Mn^{4+}$ density in the film. Also, $Mn_2O_3$ phase gradually appeared in the film as the cycle number increases.
Keywords
$LiMn_2O_4$ Sol-gel, Oxide, Thin film, Rechargeable battery, Structural properties;
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