Direct synthesis of oxygen-deficient Li2MnO3−x for high capacity lithium battery electrodes

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Abstract Oxygen-deficient Li 2 MnO 3− x (0  x 2 MnO 3 , using metal hydrides (CaH 2 and LiH) as reducing agents at reaction temperatures of 255–265 °C. The structure of the reduced phase determined by X-ray diffraction experiments has oxygen vacancies in the layered structure, causing slightly larger lattice parameters than the stoichiometric Li 2 MnO 3 . Reversible oxygen insertion and extraction from the deficient structure observed by the TG measurements suggests fast oxygen diffusion in the layered rock-salt structure. The oxygen-deficient phase shows extremely large 1st charge and discharge capacities of 388 and 305 mAh g −1 , respectively.

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