| Summary: | As novel anodic materials for lithium-ion batteries (LIBs), transitional metal selenites can transform into metal oxide/selenide heterostructures in the first cycle, which helps to enhance the Li<sup>+</sup> storage performance, especially in terms of high discharge capacity. Herein, well-defined hierarchical CoSeO<sub>3</sub>‧2H<sub>2</sub>O nanoflowers assembled using 10 nm-thick nanosheets are successfully synthesized via a facile one-step hydrothermal method. When used as anodic materials for LIBs, the CoSeO<sub>3</sub>‧2H<sub>2</sub>O nanoflowers exhibit a considerably high discharge capacity of 1064.1 mAh g<sup>−1</sup> at a current density of 0.1 A g<sup>−1</sup>. In addition, the obtained anode possesses good rate capability and cycling stability. Owing to the superior electrochemical properties, the CoSeO<sub>3</sub>‧2H<sub>2</sub>O nanoflowers would serve as promising anodic materials for high-performance LIBs.
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