|Author||Kalyani, P. ♦ Jagannathan, R. ♦ Gopukumar, S. ♦ Lu, C. H.|
|Source||CSIR-Central Electrochemical Research Institute|
|Subject Domain (in DDC)||Natural sciences & mathematics ♦ Chemistry & allied sciences ♦ Physical chemistry|
|Subject Keyword||Electrochemical Materials Science|
|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, Li2 MnO3 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.|
|Education Level||UG and PG|
|Learning Resource Type||Article|
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