Li2MnO3 loses oxygen, reversibly, on heating above ∼600 °C. By 1100 °C, 1% of the oxygen has been lost, giving a stoichiometry of Li2MnO2.97. Depending on the synthesis conditions, materials with a range of oxygen contents may be produced. Associated with the variable oxygen content, partial reduction of Mn4+ to Mn3+ occurs, as demonstrated by a direct correlation between electrochemical capacity, when used as a cathode in a rechargeable Li test cell, and oxygen content.
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Pasero et al. (2004) studied this question.
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