Abstract
LiNi 0.5Mn 1.5O 4 was prepared by a spray drying and post-annealing process. The re-annealing treatment in O 2 could not only decrease the Mn 3+ content, but also increased the reversible capacity and significantly improve the rate capability compared to the untreated material. Moreover, the cyclic performance of the LiNi 0.5Mn 1.5O 4 depends on both the cycling rate and operating temperature, which was ascribed to the difference between the phase transition rates between cubic I ↔ cubic II and cubic II ↔ cubic III.
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