Rechargeable Aluminum-Ion Battery Based on MoS 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 MoS microsphere cathode, aluminum anode, and ionic liquid electrolyte has been fabricated for the first time. It can be found that Al intercalates into the MoS 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 at a current density of 20 mA g and a discharge capacity of 66.7 mA h g at a current density of 40 mA g after 100 cycles. This will lay a solid foundation for the commercialization of aluminum-ion batteries.