Probing the Self-Discharge Current in LiMn 2 O 4 , LiCoO 2 and Li(NiMnCo) 1/3 O 2 Cathodes

We combined open-circuit voltage (OCV) measurements at equilibrium at the ambient temperatures and during thermal aging of Li/LiMO half-cells (M=transition metal) in 60-75ºC temperatures range and electrochemical entropymetry to indirectly determine the self-discharge current in the cells at the cor...

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Bibliographic Details
Published in:ECS transactions 2006-07, Vol.1 (26), p.151-159
Main Authors: Yazami, Rachid, Ozawa, Yasunori
Format: Article
Language:English
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Summary:We combined open-circuit voltage (OCV) measurements at equilibrium at the ambient temperatures and during thermal aging of Li/LiMO half-cells (M=transition metal) in 60-75ºC temperatures range and electrochemical entropymetry to indirectly determine the self-discharge current in the cells at the corresponding aging temperature. Comparison of normalized currents show highest self-discharge rates in LiMn2O4 and lowest in Li(NiMnCo1/3O2, LiCoO2 being intermediary. The results are discussed in terms of lithium re- intercalation induced phase transitions associated with electrolyte oxidation together with the phases intrinsic stability and their reactivity with the electrolyte.
ISSN:1938-5862
1938-6737
DOI:10.1149/1.2209365