MOF‐derived Core‐Shell CoP@NC@TiO<sub>2</sub> Composite as a High‐Performance Anode Material for Li‐ion Batteries
Kai Chen, Huinan Guo, Weiqin Li, Yijing Wang
Abstract
Abstract Transition‐metal phosphides have been regarded as promising anode materials for high‐energy lithium‐ion batteries (LIBs) due to their high capacity and low cost. However, the mechanical pulverization and resultant capacity fade critically limit their further development. Here, we have designed an innovative core‐shell CoP@NC@TiO 2 composite with an exotic rhombic dodecahedral morphology derived from ZIF‐67 precursor, which combines both advantages from TiO 2 with excellent cycling stability and CoP with high capacity. The additional MOF‐derived N‐doped carbon framework is considered to improve the electrical conductivity and accommodate the volume expansion of CoP particles. Moreover, the outer TiO 2 shell can also buffer the mechanical stress and maintain the integrity of composite. With the unique structure, the core‐shell CoP@NC@TiO 2 composite material exhibits excellent electrochemical performance with a considerable discharge specific capacity of 706.3 mAh g −1 at a current density of 100 mA g −1 after 200 cycles and outstanding rate capacity. Hence, our work demonstrates that this core‐shell structure strategy combined with MOF‐derived carbon framework could provide a practical pathway towards enhanced electrode materials for energy storage and conversion.