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Li-riched layered-layered oxide compound High reversible specific capacity (>250 mAh/g);Integration and interconnection of LiMO2-like (rhombohedral) and Li2MnO3 (monoclinic) structures at atomic level;Li1.2Ni0.15Co0.1Mn0.55O2=0.5Li2MnO3·0.5LiNi0.375Co0.25Mn0.375O2 Activation of Li2MnO3 during the 1st charge process;Structure evolution from surface to bulk during cycle.