Dimensional Gradient Structure of CoSe 2 @CNTs–MXene Anode Assisted by Ether for High-Capacity, Stable Sodium Storage

Highlights Dimensional gradient structure of sheet–tube–dots was constructed with CoSe 2 @CNTs–MXene for fast ion and electron transportation. Density functional theory study discloses the electrochemical difference of CoSe 2 @CNTs–MXene in ether/ester electrolyte system. Phase transformation of CoSe 2 @CNTs–MXene was analyzed by in situ XRD. The full cell based on CoSe 2 @CNTs–MXene anode was also assembled.