Novel Insight into Rechargeable Aluminum Batteries with Promising Selenium Sulfide@Carbon Nanofibers Cathode.

Due to the unique electronic structure of aluminum ions (Al ) with strong Coulombic interaction and complex bonding situation (simultaneously covalent/ionic bonds), traditional electrodes, mismatching with the bonding orbital of Al , usually exhibit slow kinetic process with inferior rechargeable aluminum batteries (RABs) performance. Herein, to break the confinement of the interaction mismatch between Al and the electrode, a previously unexplored Se S -based cathode with sufficient valence electronic energy overlap with Al and easily accessible structure is potentially developed. Through this new strategy, Se S encapsulated in multichannel carbon nanofibers with free-standing structure exhibits a high capacity of 606 mAh g at 50 mA g , high rate-capacity (211 mAh g at 2.0 A g ), robust stability (187 mAh g at 0.5 A g after 3,000 cycles), and enhanced flexibility. Simultaneously, in/ex-situ characterizations also reveal the unexplored mechanism of Se S in RABs.