Abstract
This work presents an investigation on the effect of oxygen stoichiometry on the behavior of Li2MnO3 and related cathode materials using a thin film deposition technique. It is shown that pure Li2MnO3 and Li2MnO3-based Li-rich cathodes behave very differentlywhen prepared under similar oxygen partial pressure. Li-rich cathodes perform the best when deposited at low oxygen partial pressure while Li2MnO3requiresa moderate partial pressure for optimum capacity. This behavior is attributed to impurity formation in pure Li2MnO3 at low oxygen stoichiometry as well as stabilization of Li2MnO3 by the LiMO2 (M= Ni,Co,Mn)matrix in the case of the Li-rich cathodes.
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