Rechargeable Aluminum-Ion Battery Based on MoS₂ Microsphere Cathode

In recent years, a rechargeable aluminum-ion battery based on ionic liquid electrolyte is being extensively explored due to three-electron electrochemical reactions, rich resources, and safety. Herein, a rechargeable Al-ion battery composed of MoS₂ microsphere cathode, aluminum anode, and ionic liquid electrolyte has been fabricated for the first time. It can be found that Al³⁺ intercalates into the MoS₂ during the electrochemical reaction, whereas the storage mechanisms of the electrode material interface and internal are quite different. This result is confirmed by ex situ X-ray photoelectron spectroscopy and X-ray diffraction etching techniques. Meanwhile, this aluminum-ion battery also shows excellent electrochemical performance, such as a discharge specific capacity of 253.6 mA h g^–1 at a current density of 20 mA g^–1 and a discharge capacity of 66.7 mA h g^–1 at a current density of 40 mA g^–1 after 100 cycles. This will lay a solid foundation for the commercialization of aluminum-ion batteries