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• W2093670759 endingPage "1992" @default.
• W2093670759 startingPage "1984" @default.
• W2093670759 abstract "Lithium intercalation compounds based on lithium manganese oxides are of great importance as positive electrodes for rechargeable lithium batteries. It is widely accepted that Li+ may be extracted (deintercalated) from such lithium manganese oxides accompanied by oxidation of Mn up to a maximum oxidation state of +4. However, it has been suggested recently that further Li+ removal may be possible. Among the mechanisms that have been proposed to charge balance the removal of Li+ are Mn oxidation beyond +4 or loss of O2-. To investigate this phenomenon we have selected Li2MnO3, a layered compound Li[Li1/3Mn2/3]O2 with a ready supply of mobile Li+ ions but with all Mn already in the +4 oxidation state. We show that a substantial quantity of Li (at least 1.39 Li) may be removed. At 55 °C this occurs exclusively by oxidation of the nonaqueous electrolyte, thus generating H+ which exchange one-for-one with Li+ to form Li2-xHxMnO3. The presence of H+ between the oxide layers results in a change of the layer stacking from O3 to P3, the latter being more stable for O−H−O bonding. At 30 °C initial Li removal is accompanied by oxygen loss (effective removal of Li2O) but further Li+ removal involves the same proton exchange mechanism as observed at 55 °C. The reaction is partially reversible. On extended cycling the material converts to spinel." @default.
• W2093670759 created "2016-06-24" @default.
• W2093670759 creator A5056496930 @default.
• W2093670759 creator A5070781175 @default.
• W2093670759 date "2003-04-05" @default.
• W2093670759 modified "2023-10-16" @default.
• W2093670759 title "Mechanism of Electrochemical Activity in Li₂MnO₃" @default.
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• W2093670759 doi "https://doi.org/10.1021/cm030047u" @default.
• W2093670759 hasPublicationYear "2003" @default.
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