Abstract
Carbonate electrolytes have excellent chemical stability and high salt solubility, which is ideally practical choice for achieving high energy density sodium (Na) metal battery at room temperature. However, their application at ultra-low temperature (-40 oC) is adversely affected by the instability of solid electrolyte interphase (SEI) formed by electrolyte decomposition and the difficulty of desolvation. Here, we designed a novel low-temperature carbonate electrolyte by molecular engineering on solvation structure. The calculations show that ethylene sulfate (ES) inhibits solvent decomposition and reduces the sodium ion desolvation energy. In addition, experimental results demonstrate that ES promotes the forming of more inorganic substances on the Na surface, which inhibits dendrite growth and increases ionic conductivity. At -40 oC, the Na||Na symmetric battery exhibits a stable cycle of 1500 hours, and the Na||Na3V2(PO4)3 (NVP) battery achieves 88.2% capacity retention after 200 cycles. Our work provides a new way to develop high energy density sodium metal battery under extreme low temperature environment.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
