Ultrathin MoS1.68Se0.32 Alloy Nanoflakes: An Intercalation-Type Positive Electrode Material for Rechargeable Aluminum-Ion Battery

Rechargeable aluminum-ion battery (RAIB), as a promising candidate for the next-generation energy storage system, engages considerable attention because of a high theoretical specific capacity, abundant elemental source, and low cost. Nevertheless, limited applicable positive electrode material with highly reversible aluminum storage ability has been a major barrier in the pursuit of better RAIB. Herein, we prepared ultrathin MoS1.68Se0.32 alloy nanoflakes with few-layer (single layer) thickness for the positive electrode of RAIB. The electrochemical performances demonstrate the feasibility of reversible Al3+ intercalation in ultrathin MoS1.68Se0.32 showing good properties. The DFT calculations shed light on the possible Al3+ intercalation sites in MoS1.68Se0.32, where the interlayer energy barriers are lowest.