A Pyramidal Metal–Organic Frameworks‐Derived FeP@CoP Aluminium‐Ion Battery Cathode Displaying Low‐Temperature Tolerance and Fast Electron Transfer Kinetics

Abstract

AbstractAnhui Provincial Engineering Laboratory for Engineering appropriate cathode materials is significant for the development of high‐performance aluminum‐ion (Al‐ion) batteries. Here, a pyramidal metal–organic frameworks (MOFs)‐derived FeP@CoP composite was developed as cathode, which exhibits good stability and high capacity. FeP@CoP cathode maintains a high capacity of 168 mAh g−1 after 200 cycles, and displays a stable rate‐performance at both room and low temperatures of −10 °C. After three rounds of rate‐performance cycling, the FeP@CoP composite recovers 178.2 mAh g−1 at 0.3 A g−1. Moreover, density functional theory (DFT) calculations verify improved electron‐transfer kinetics with narrowed band gap and enhanced density of states. These findings inspire a broad set of studies on MOFs‐derived composites for high‐performance secondary batteries.