LiCoMnO 4 materials have been synthesized via a hydrothermal approach followed by a post-annealing process. Pure phase of LiCoMnO 4 is unable to form under hydrothermal conditions; however, high quality of pure LiCoMnO 4 was achieved after annealing the hydrothermal products. The concentration of LiOH and the post-annealing temperature are the crucial factors to form LiCoMnO 4 . Without post-annealing process, the highest contents of LiCoMnO 4 in the hydrothermal products are less than 50% (e.g., in the presence of 1.2-1.35 M LiOH); in contrast, in the cases of 1.35-1.4 M LiOH, almost pure phase of LiCoMnO 4 has been achieved successfully after annealing the hydrothermal precursors at 750°C. The asprepared sample in the presence of 1.35 M LiOH, after annealed at 750°C, exhibits a capacity of 91.6 mAh g −1 .

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