The electrochemical and structural properties of spinel phases in the Li-Mn-O system are discussed as insertion electrodes for rechargeable lithium batteries. The performance of button-type cells containing electrodes from the Li20 9 yMnOz system, e.g., the stoichiometric spinel Li4Mn5012 (y = 2.5) and the defect spinel Li2Mn,O9 (y = 4.0), is highlighted and compared with a cell containing a standard LiMn204 spinel electrode.

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