Suppression of Structural Fatigue by Doping in Spinel Electrode Probed by In Situ Bending Beam Method

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Chung, Kyung Yoon; Yoon, Won-Sub; Kim, Kwang-Bum; Yang, Xiao-Qing; Oh, Seung Mo
Issue Date
Electrochemical Society
J. Electrochem. Soc., 151, A484 (2004)
The onset of a Jahn-Teller effect at the surface of LiMn2O4 particles during cycling in the 4 V range was previously reported to
be one of the causes for the capacity fading. Furthermore, it has been reported that the Jahn-Teller effect in the 4 V range may be
suppressed by the substitution of the Mn ions by either Li or other transition metal ions. However, no direct evidence has yet been
reported. This study provides evidence for the onset of a Jahn-Teller effect in thin film 4 V LiMn2O4 and its suppression caused
by substituting the Mn ions with Co31 and Ni21 ions using in situ bending beam method ~BBM!. The deflectograms are measured
simultaneously with galvanostatic charge/discharge or cyclic voltammograms, and the onset of the Jahn-Teller effect is investigated
by means of the differential strain peak which is observed at around 3.90-3.95 V during cyclic voltammetry, and the slope
variation observed in the strain curves during galvanostatic charge/discharge. The suppression of the Jahn-Teller effect in the
doped spinel leads to the magnitude of the differential strain peak resulting from the Jahn-Teller effect being reduced in comparison
with the other two pairs of peaks, which correspond to the current peaks of the cyclic voltammogram.
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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