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New electrode materials of layered oxides, NaNi0.4Fe0.2Mn0.4−xTixO2, have been synthesized as positive electrodes for sodium-ion batteries. The partial substitution of Mn with Ti increases the lattice spacing without changing the lattice structure. A Na//NaNi0.4Fe0.2Mn0.2Ti0.2O2 cell delivers a reversible capacity of 145 mA h g−1 with excellent long cycling performance.
Sun et al. (Tue,) studied this question.