Facile Synthesis of Hierarchical CoSeO₃‧2H₂O Nanoflowers Assembled by Nanosheets as a Novel Anode Material for High-Performance Lithium-Ion Batteries

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⁺ storage performance, especially in terms of high discharge capacity. Herein, well-defined hierarchical CoSeO₃‧2H₂O 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 CoSeO₃‧2H₂O nanoflowers exhibit a considerably high discharge capacity of 1064.1 mAh g^-1 at a current density of 0.1 A g^-1. In addition, the obtained anode possesses good rate capability and cycling stability. Owing to the superior electrochemical properties, the CoSeO₃‧2H₂O nanoflowers would serve as promising anodic materials for high-performance LIBs.