A High‐Crystalline NaV1.25Ti0.75O4 Anode for Wide‐Temperature Sodium‐Ion Battery

Abstract Sodium‐ion batteries with abundant and low‐cost sodium resources is a promising alternative to Li‐ion batteries in large‐scale energy applications. While the anode materials, due to their insufficient cycling life and insecure voltage, could not still satisfy the market demands, especially in the wide‐temperature fields, here, a high‐crystallinity anode material with post‐spinel structure, namely NaV 1.25 Ti 0.75 O 4 , which always maintains excellent electrochemical performance at the widely variable temperatures, is reported. The results indicate that this anode delivers a high‐safety and ultrastable room‐temperature performance (i.e., an average output voltage of 0.7 V vs Na + /Na and the ultralong cycling life over 10 000 cycles) and good wide‐temperature performance (below 9% capacity variation at 60 and −20 °C compared to that at 25 °C). These excellent achievements could benefit from the long durability and stability of 1D channels and superfast ion diffusion in a temperature‐dependent range. This finding provides a promising strategy to construct the safe and stable full‐cell prototypes and promotes the wide‐temperature application of sodium‐ion batteries.