Ultrahigh?Rate and Ultralong?Duration Sodium Storage Enabled by Sodiation?Driven Reconfiguration

Despite their variable valence and favorable sodiation/desodiation potential, vanadium sulfides (VSx) used as anode materials of sodium-ion batteries (SIBs) have been held back by capacity decline low cycling capability, associated with the structure distortion volume expansion pulverization. This study reports an accessible process to tackle these challenges via fabricating a 3D-VSx for SIBs ultrahigh-rate ultralong-duration stable sodium storage. The sodiation-driven reactivation micro-nano activates reconfiguration effect, effectively maintaining structural integrity. Interestingly, mechanical degradation over sodiation can be controlled fine-tuning operating voltage. self-reconfigured open nanostructures large void space not only withstand repetitive changes mitigate damaging stresses, but also in turn construct self-optimized shortened ion diffusion pathway. Moreover, excites many active sites optimizes solid-electrolyte interface, thereby delivering reversible 961.4 mA h g?1 after 1500 cycles at high rate 2 A g?1. work provides new insight into rational design electrodes toward long-lived through reconfiguration.