Mn2+ Intercalated V2C MXene for Enhanced Sodium Ion Battery

Mn 2+ intercalation strategy to optimize the sodium storage performance of V 2 C MXene was studied. The intercalated Mn 2+ not only enlarged the interlayer spacing of V 2 C MXene but also formed a V-O-Mn covalent bond, which was beneficial to stabilize the structure of V 2 C and inhibit the structural collapse caused by volume change during Na + decalation or intercalation. As a result, the intercalated V 2 C MXene (V 2 C@Mn) electrode showed a high specific capacity of 425 mAhg -1 at the current density of 0.05 Ag -1 , and 70% retention after 1200 cycles. This result clearly suggests that cations intercalated MXene has a great prospect in Na + storage.