Long life exceeding 10 000 cycles for aluminum-ion batteries based on an FeTe 2 @GO composite as the cathode.

A nanocomposite consisting of iron telluride wrapped with graphene oxide (GO) was prepared via a hydrothermal method. As the cathode material for aluminum-ion batteries (AIBs), it exhibited a remarkable long-term cycle performance with a reversible capacity of 120.4 mA h g -1 at 1 A g -1 after 10 000 cycles, i.e. , a cyclability better than those of all other transition metal chalcogenides in AIBs reported to date. Furthermore, an energy storage mechanism, involving the intercalation and deintercalation of multiple ions (AlCl 4 - , Cl - and Al 3+ ), was elucidated. This study offers guidance for further development of transition metal tellurides for AIBs.