Approaching High‐Performance Lithium Storage Materials by Constructing Hierarchical CoNiO2@CeO2 Nanosheets

In this work, the hierarchical CoNiO 2 @CeO 2 nanosheet composites were successfully prepared by a one‐step hydrothermal process with a subsequent annealing process for the first time. The CeO 2 nanoparticles successfully deposit on the surface of CoNiO 2 nanosheet, and benefit the improvement of electrical contact between CoNiO 2 and CeO 2 . CeO 2 modification improve the reversibility of insertion/extraction of Li‐ions and electrochemical reaction activity, and promotes the transport of Li‐ions. Benefited of the unique architecture and component, the CoNiO 2 @CeO 2 nanosheet composites show high‐reversible capacities, excellent cycling stability and good rate capability. The CoNiO 2 @CeO 2 (5.0 wt%) shows a charge/discharge capacity of 867.1/843.2 mAh g −1 after 600 cycles at 1 A g −1 , but the pristine CoNiO 2 @CeO 2 nanosheet only delivers a charge/discharge capacity of 516.9/517.6 mAh g −1 after 500 cycles. The first‐principles calculation reveals that valid interfaces between CeO 2 and NiCoO 2 can be formed, and the formation process of the interfaces is exothermic. The strong interfacial interaction resulting in an excellent structure stability and thus a cycling stability of the CoNiO 2 @CeO 2 material. This work provides an effective strategy to develop high‐performance anode materials for advanced a lithium‐ion battery, and the CoNiO 2 @CeO 2 nanosheet shows a sizeable potential as an anode material for next generation of high‐energy Li‐ion batteries.