Effect of Combination Model of MoTe 2 and MXene Layers on Sodium Ion Storage

Abstract The integration of different crystal planes between two‐dimensional (2D) materials results in various combinations, which always exert different effects on the electrochemical properties of materials. The metallic 1T′ phase of molybdenum telluride is a promising anode for sodium‐ion batteries (SIBs), but its rearrangement and restacking during charge/discharge process causes a decline in cycle. Herein, MX@MoTe 2 ‐P with MoTe 2 (002) planes parallel to MXene layers and MX@MoTe 2 ‐V with MoTe 2 (002) planes perpendicular to MXene layers are controllably constructed. Compared with MX@MoTe 2 ‐V, the new interface formed between MoTe 2 and MXene in MX@MoTe 2 ‐P has a stronger van der Waals interaction and larger contact area, helpful to store more sodium ions and contributing to its excellent structural stability and battery capacity. Although MX@MoTe 2 ‐V has a higher sodium adsorption energy than MX@MoTe 2 ‐P, the small interface area lowers the storage capacity and it further aggravates the collapse of the structure. When used as the anode for SIBs, MX@MoTe 2 ‐P offers excellent cycle stability and specific capacity. In particular, sodium‐ion full cell consisting of MX@MoTe 2 ‐P anode and Na 3 V 2 (PO 4 ) 3 cathode shows the excellent performance (147.2 mAh g −1 @1000 cycles at 5 A g −1 ) surpassing all the reported MoTe 2 ‐based materials. This work provides a guide for the manufacture of new electrode materials.