Constructing All-Climate Hybrid Sodium Ion/Metal Batteries through Intersolvent Synergistic Effect
Yiwen Gao, Haifeng Tu, Jiangyan Xue, Yan Wang, Shiqi Zhang, Suwan Lu, Lingwang Liu, Keyang Peng, Guochao Sun, Guangye Wu, Peng Ding, Yi Yang, Zhicheng Wang, Jingjing Xu, Xiaodong Wu
Abstract
Rechargeable sodium ion batteries (SIBs) under extreme conditions are still limited by sluggish Na + transport/desolvation kinetics and unstable electrode/electrolyte interface, thus leading to rapid capacity decay and a short lifespan. Herein, electrolyte engineering is proposed via solvent–solvent hydrogen bonding interaction between dimethyl sulfite (DMS) and glutaronitrile (GN) solvents for wide-temperature SIBs. The formed hydrogen bonding between DMS and GN solvents not only enhances the antioxidative ability of DMS but also simultaneously promotes the formation of a loose solvation structure by distancing DMS from Na + ions, facilitating Na + transport/desolvation kinetics. The well-designed electrolyte exhibits wide-temperature application from −55 to 60 °C in NaNi 0.33 Fe 0.33 Mn 0.33 O 2 ||Na half cells, while the improved cycling stability with preactivated hard carbon anode is also obtained from −40 to 45 °C. This work sheds light on intersolvent synergistic effect for wide-temperature electrolyte design, specializing in regulating electrolyte thermodynamic and kinetic behavior.