https://scholars.lib.ntu.edu.tw/handle/123456789/66345
Title: | Luminescence in some lithiated transition metal oxide cathodes | Authors: | Kalyani, P. Jagannathan, R. Gopukumar, S. Lu, Chung-Hsin |
Keywords: | Bode plot; Cathodes; Electrochemical fading; Luminescence; Photo-induced impedance | Issue Date: | 2002 | Journal Volume: | 109 | Journal Issue: | 2 | Start page/Pages: | 301-307 | Source: | Journal of Power Sources | Abstract: | Lithiated transition metal oxides such as LiNiVO4, Li2MnO3 and Li0.4WO3 used as cathode materials in high density lithium-ion batteries, show intense optical absorption followed by fluorescence in the region of 2-4 eV. These optical transitions can tentatively be assigned to either transition metal to oxygen charge transfer type or Jahn-Teller type local distortion. For fluorescing samples (LiNiVO4, Li2MnO3 and Li0.4WO4), photo-induced impedance (Bode plot) data show significant enhancement in impedance under low frequency range (∼10 Hz). However, more important cathode materials such as LiCoO2 and LiMn2O4 do not show either fluorescence or photo-induced impedance enhancement. The presence or absence of an optical transition in the cathode system may give some clues on the tendency for electrochemical fading. © 2002 Elsevier Science B.V. All rights reserved. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/92082 | DOI: | 10.1016/S0378-7753(02)00057-5 | SDG/Keyword: | Cathodes; Charge transfer; Electric impedance; Electrochemistry; Frequencies; Light absorption; Lithium compounds; Luminescence; Electrochemical fading; Lithium batteries |
Appears in Collections: | 化學工程學系 |
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