Topotactic phase transformation of lithiated spinel to layered LiMn 0.5 Ni 0.5 O ₂ : the interaction of 3-D and 2-D Li-ion diffusion

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Newly discovered cubic Li-excess spinel (LxS) structured LiMn 0.5 Ni 0.5 O 2 cathode shows unique temperature-dependent topotactic phase transformation between 400–900 °C, affecting Li ion diffusion pathways and electrochemical performance.