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A spinel-type Li 4 Mn 5 O 12 precursor was synthesized by solid-phase reaction using inexpensive manganese and lithium salts as raw materials, where the two-step calcination procedure (at 543K for 2h and 673K for 24h) was adopted. The synthesized Li 4 Mn 5 O 12 precursor was characterized using X-ray powder diffraction, scanning electron microscope,...