Issue 8, 2022

High energy density Na-metal batteries enabled by a tailored carbonate-based electrolyte

Abstract

High-voltage sodium metal batteries (SMBs) offer a viable way toward high energy densities. However, they synchronously place severe demands on the electrolyte for the notorious reactivity of Na-metal and the catalytic nature of aggressive high-voltage chemistries. Here, we fabricate a tailored carbonate-based electrolyte involving lithium difluorobis(oxalato) phosphate (LiDFBOP) as a multifunctional additive, where DFBOP− anions can generate stable and robust interphases on both the anode and cathode. Meanwhile, Li+-ions can take part in the solvation structure to regulate the electrolyte stability as well as resist dendritic deposition via electrostatic shielding. Such optimization effectively realizes high coulombic efficiency (98.6%) and prolonged life (2600 h) of Na plating/stripping together with the upgraded reversibility of the Na3V2(PO4)2F3 cathode. Moreover, the assembled 4.5 V Na||Na3V2(PO4)2F3 SMB achieves impressive cycling stability with 90% capacity retention after 220 cycles and a high energy density of 295 W h kg−1 with limited Na. The proposed electrolyte strategy can shed light on further optimization for high-energy sodium metal chemistries.

Graphical abstract: High energy density Na-metal batteries enabled by a tailored carbonate-based electrolyte

Supplementary files

Article information

Article type
Paper
Submitted
18 Apr 2022
Accepted
09 Jun 2022
First published
13 Jun 2022

Energy Environ. Sci., 2022,15, 3360-3368

High energy density Na-metal batteries enabled by a tailored carbonate-based electrolyte

J. Chen, Y. Peng, Y. Yin, M. Liu, Z. Fang, Y. Xie, B. Chen, Y. Cao, L. Xing, J. Huang, Y. Wang, X. Dong and Y. Xia, Energy Environ. Sci., 2022, 15, 3360 DOI: 10.1039/D2EE01257J

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