MXene-Based Mixed Conductor Interphase for Dendrite-Free Flexible Al Organic Battery

Al batteries are promising post-Li battery technologies for large-scale energy storage applications owing to their low cost and high theoretical capacity. However, one of the challenges that hinder their development is the unsatisfactory plating/stripping of the Al metal anode. To circumvent this issue, an ultrathin MXene layer is constructed on the surface of Al by in situ chemical reactions at room temperature. The as-prepared flexible MXene film acts like armor to protect the Al-metal by its high ionic conductivity and high mechanical flexibility. The MXene endow the Al anode with a long cyclic life of more than 5000 h at ultrahigh current density of 50 mA cm^–2 for Al//Al batteries and a retention of 100% over 200 cycles for 355 Wh kg^–1 PTO//Al batteries. This work provides fresh insights into the formation and regulation of stable electrode–electrolyte interfaces as well as effective strategies for improving Al metal batteries.