Rapid evaluation of charge/discharge properties for lithium manganese oxide particles at elevated temperatures |
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| Authors: | Kaoru Dokko Soichi Horikoshi Takashi Itoh Matsuhiko Nishizawa Takayuki Abe Minoru Umeda Isamu Uchida |
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| Institution: | (1) Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Aramaki-Aoba 07, Aoba-ku, Sendai 980-8579, Japan,;(2) Hydrogen Isotope Research Center, Toyama University, Gofuku 3190, Toyama 930-8555, Japan, |
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| Abstract: | A microelectrode technique was applied to investigate the electrochemical properties of LiMn2O4 particles at elevated temperatures. Cyclic voltammograms of LiMn2O4 were measured after the particles were exposed to the electrolytes. This technique results in rapid and precise evaluation
of the redox behavior of the materials. A significant capacity fading was observed in 1 M LiPF6/EC+PC electrolytic solution, which indicates that both LiMn2O4 and LiPF6 participate in the reaction to produce an inert material on the particle surface. Next, the capacity fading for two different
BET surface area particles were compared using 1 M LiPF6/EC+PC at 50 °C. The reaction was found not to be controlled by the surface area. Finally, a Li1.1Mn1.9O4 particle was employed. The fading in discharge was ca. 10% for 50 cycles even at 50 °C, which means that the partial substitution
of Mn in LiMn2O4 by Li substantially enhanced the capacity stability.
Electronic Publication |
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| Keywords: | Microelectrode technique Lithium manganese oxide spinel Charge/discharge properties Elevated temperature |
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