Ti 3 C 2 T x MXene Decorated MoS 2 Quantum Dot as Efficient Anode Material for Wide Temperature Na‐Ion Batteries

ABSTRACT Designing wide‐temperature sodium‐ion full cells (SIFCs) remains a critical challenge due to sluggish ion transport at low‐temperature conditions and parasitic reactions at elevated temperatures. Herein, we report a sodium‐ion full cell constructed with a MoS 2 quantum dot (QD)–Ti 3 C 2 T x composite as anode, Na 3 V 2 (PO 4 ) 3 (NVP) as cathode and 1 M NaClO 4 as electrolyte, which achieves high performance and exceptional wide‐temperature tolerance. MoS 2 QDs minimize lattice strain and suppress pulverization, while the conductive Ti 3 C 2 T x framework ensures structural stability and fast charge transfer. As a result, the anode delivers a high initial capacity of 630 mAh g −1 at 0.1 A g −1 with 92% coulombic efficiency and retains 432 mAh g −1 after long‐term cycling, in half cell configuration. When integrated into a full cell, the device demonstrates remarkable durability with 87% capacity retention after 500 cycles. Temperature‐dependent measurements reveal stable operation across −30 °C to 60 °C, with enhanced capacity at elevated temperature due to improved Na‐ion diffusion and reliable performance even at −30 °C. These results highlight MoS 2 QD_ Ti 3 C 2 T x as a structurally resilient anode material enabling robust wide‐temperature sodium‐ion full cells, offering a practical route for grid‐scale and industrial energy storage applications.