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Abstract
In this work, the characterization of novel electrolytes based on the combination of propylene carbonate(PC)solvent with sodium bis(fluorosulfonyl)imide(NaFSI)and sodium difluoro(oxalato)borate(NaDFOB), as well as their application in sodium-ion batteries(SIBs) is presented. The results show that dual-salt electrolytes have a wide electrochemical stability window, excellent transport properties, and mostly suppress anodic dissolution. When combined with P2-Na2/3Al1/9Fe1/9Mn2/3Ni1/9O2(P2-AFMNO) cathode electrode for SIBs operating at 4.3V vs Na+/Na, they enable high performance and stability. XPS investigation revealed that this performance is related to the formation of a thin and homogeneous cathode electrolyte interphase (CEI) at the electrode surface.
Published Version
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