<p>Sodium-ion batteries (SIBs) have been regarded as promising alternatives for large-scale energy storage, yet their practical application has been hindered by sluggish Na⁺ kinetics and the intrinsic limitations of MoS₂ anodes, such as low conductivity and severe volume variation. Herein, a MoS₂ heterostructure composite was synthesized via a one-step hydrothermal method, in which graphene oxide (GO) was uniformly anchored with ultrafine MoS₂-SnS₂ quantum dots (MoS₂-SnS₂@GO). By this architecture, a robust three-dimensional conductive framework was established, providing abundant active sites, shortened ion/electron transport pathways, and enhanced structural stability. As a result, an initial discharge capacity of 1087.9 mAh·g⁻¹ was achieved, and a reversible capacity of 304.8 mAh·g⁻¹ was retained after 1000 cycles at 1 A·g⁻¹. Even at 10 A·g⁻¹, 114.6 mAh·g⁻¹ was maintained, and the capacity could recover when the current returned to 0.1 A·g⁻¹, demonstrating excellent rate reversibility. Significantly reduced charge-transfer resistance and accelerated Na⁺ diffusion were observed. Density functional theory (DFT) calculations further revealed a narrowed bandgap and a lowered Na⁺ migration barrier (from 0.26 to 0.19&#xa0;eV), along with a built-in electric field across the heterointerface that promoted directional charge transport. This study highlights a feasible quantum-dot-enabled interface engineering strategy for achieving high-rate and durable SIB anodes.</p> Graphical abstract <p></p>