Journal
ELECTROCHEMICAL AND SOLID STATE LETTERS
Volume 7, Issue 1, Pages A1-A4Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.1625591
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Electrodes based on the layered compounds Li-x[Mn1-yLiy]O-2, y less than or equal to 0.2, have been charged in the electrolyte, 1 m LiPF6 in ethylene carbonate/diethyl carbonate (1:2 v/v). Initially Li+ removal is accompanied by oxidation of Mn3+ to Mn4+. Once all Mn is in the 4+ oxidation state further Li+ removal occurs by two unconventional mechanisms, one involving oxidation of O2- with subsequent O loss (effective removal of Li2O) and the other electrolyte oxidation generating H+ which exchanges for Li+ in the electrode. Although both mechanisms appear to occur at 30 and 55degreesC, the former dominates at both temperatures in contrast to Li2MnO3. (C) 2003 The Electrochemical Society.
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