Sodium‐Ion Battery with a Wide Operation‐Temperature Range from −70 to 100 °C
Zhi Li, Yu Zhang, Jianhua Zhang, Yongjie Cao, Jiawei Chen, Haimei Liu, Yonggang Wang
Abstract
Abstract Sodium‐ion batteries (SIBs), as one of the potential candidates for grid‐scale energy storage systems, are required to tackle extreme weather conditions. However, the all‐weather SIBs with a wide operation‐temperature range are rarely reported. Herein, we propose a wide‐temperature range SIB, which involves a carbon‐coated Na 4 Fe 3 (PO 4 ) 2 P 2 O 7 (NFPP@C) cathode, a bismuth (Bi) anode, and a diglyme‐based electrolyte. We demonstrate that solvated Na + can be directly stored by the Bi anode via an alloying reaction without the de‐solvent process. Furthermore, the NFPP@C cathode exhibits a high Na + diffusion coefficient at low temperature. As a result, the Bi//NFPP@C battery exhibits perfect low‐temperature behavior. Even at −70 °C, this battery still delivers 70.19 % of the room‐temperature capacity. Furthermore, benefitting from the high boiling point of the electrolyte, this battery also works well at a high temperature of up to 100 °C. These results are encouraging for the further exploration of wide‐temperature range SIBs.