Hydrogen‐Bond‐Coupling Interfacial Microenvironment Enables Fast Charging of Sodium‐Ion Batteries Over a Wide Temperature Range

Abstract With the deepening global energy transition and expanding diversified application scenarios, developing sodium‐ion batteries with both fast‐charging capability and wide‐temperature adaptability has become urgent. However, the core challenge lies in constructing a stable cathode‐electrolyte interface (CEI). Traditional strategies overly rely on electrolyte formulation adjustments while neglecting intrinsic material surface engineering. This study innovatively proposes a hydrogen‐bond ‐coupling mechanism between surface hydroxyl groups on the cathode and electrolyte molecules, precisely tuning the interface microenvironment to synergistically resolve conflicts between high/low‐temperature interfacial failures. Specifically, hydrogen bonding induces preferential decomposition of fluoroethylene carbonate (FEC) to form a NaF‐rich CEI layer that suppresses parasitic reactions, and strengthened Na ⁺ ‐interface interactions significantly reduce ion diffusion energy barriers. Validated on the Na 3 V 2 (PO 4 ) 3 cathode, this strategy endows exceptional performance across an ultra‐wide temperature range: achieving 80% charging only takes 38.8 s at 60C at room temperature, retaining 84.17% capacity after 1600 cycles at 80 °C and 10C, and operating normally even at an extremely low temperature of −80 °C. This work breaks through conventional interface optimization paradigms, providing a universal new strategy for interface chemical design of high‐performance electrode materials.