Interfacial Coupling FeSe2/MoS2 Heterostructure as a Promising Cathode for Aluminum-Ion Batteries

The affordable and high-capacity aluminum-ion batteries (AIBs) are potential candidates for energy-storage systems. Nevertheless, traditional transition-metal chalcogenide (TMC) cathodes encounter severe capacity decay and sluggish reaction kinetics, impeding the development of AIBs. Herein, we have prepared the heterostructured FeSe2/MoS2 nanoflowers as the cathodes for AIBs. The construction of the built-in electric field in the interface of two phases plays an important role in realizing rapid charge transport, stable structure, and increased reversible capacity. As a result, the heterostructured FeSe2/MoS2 nanoflowers cathodes deliver an outstanding discharge capacity of 222 mAh g–1 at 0.5 A g–1 and an excellent cycling stability of 116 mAh g–1 over 140 cycles at 1.0 A g–1. These works provide a versatile strategy for further boosting the electrochemical performance of AIBs.