Space‐Confined MoS 2 in Gradient‐Structured Carbon Spheres for Ultra‐Stable Sodium‐Ion Storage

Abstract Rational design of electrode architectures that simultaneously facilitate rapid ion diffusion and ensure structural stability remains a critical challenge for sodium ion batteries (SIBs). To address this, a novel gradient pore‐directed confinement strategy to construct MoS 2 nanosheets within a 3D ordered mesoporous carbon matrix (MoS 2 @MC) is developed. This unique architecture guides the uniform growth of MoS 2 , establishing continuous conductive networks for efficient electron transfer, creating graded ion‐diffusion channels for reduced energy barriers, and providing robust mechanical buffers to mitigate volume expansion. As a result, the optimized MoS 2 @MC‐3‐II delivers outstanding cycling stability (290.4 mAh g −1 after 2500 cycles at 5 A g −1 ) and high‐rate capability. The in‐situ X‐ray diffraction (XRD), ex‐situ X‐ray photoelectron spectroscopy (XPS), and high‐resolution transmission electron microscopy (HRTEM) analyses reveal a reversible conversion mechanism of MoS 2 @MC. Furthermore, Na 3 V 2 (PO 4 ) 3 //MoS 2 @MC‐3‐II coin‐type full cells show stable cycling performance, demonstrating the practical viability of this strategy for advanced SIBs.