Luminescence in some lithiated transition metal oxide cathodes
Resource
Journal of Power Sources 109 (2): 301-307
Journal
Journal of Power Sources
Journal Volume
109
Journal Issue
2
Pages
301-307
Date Issued
2002
Date
2002
Author(s)
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.
Subjects
Bode plot; Cathodes; Electrochemical fading; Luminescence; Photo-induced impedance
SDGs
Other Subjects
Cathodes; Charge transfer; Electric impedance; Electrochemistry; Frequencies; Light absorption; Lithium compounds; Luminescence; Electrochemical fading; Lithium batteries
Type
journal article
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