Abstract
Sodium-metal batteries are an appealing, sustainable, low-cost alternative to lithium metal batteries due to the high abundance and theoretical specific capacity (1,165 mA h g−1) of sodium. However, the poor compatibility of the electrolyte with the cathode and anode leads to unstable electrode–electrolyte interphases. Here we introduce the concept of using a salt as a diluent, which enables the use of a single non-flammable solvent, such as trimethyl phosphate. By using sodium nitrate (NaNO3) salt as a model diluent, we report a 1.1 M NaFSI–NaNO3–trimethyl phosphate electrolyte that forms a stable interface with sodium-metal anode. In addition, the formation of robust cathode–electrolyte interphases on Na(Ni0.3Fe0.4Mn0.3)O2 cathode facilitates smooth phase transitions, thus leading to stable cycle life with a capacity retention of 80% over 500 cycles at C/5 rate in Na||Na(Ni0.3Fe0.4Mn0.3)O2 cells. The work demonstrates a promising approach towards the development of safe, low-cost, sustainable high-performance sodium-metal batteries.
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Acknowledgements
This work was supported by the US Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering under award number DE-SC0005397.
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J.H., A.B. and A.M. conceived the idea. J.H. performed electrolyte formulations, collected electrochemical data and wrote the paper. A.B. performed the FTIR, NMR and pouch cell experiments. J.O. and L.S. performed the Synchrotron-based operando ED–XRD and corresponding analysis. J.L. provided the NFM cathode. W.S. performed theoretical calculations. A.M. supervised the project and edited the paper. All authors discussed the results and reviewed the paper.
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J.H., A.B. and A.M. declare that this work has been filed as International Patent Application number PCT/US2023/029298. All other authors declare no competing interests.
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Nature Energy thanks Michel Armand and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
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Supplementary Figs. 1–30, Tables 1–5 and discussion.
Supplementary Video 1
The carbonate electrolyte easily catches fire.
Supplementary Video 2
The conventional LHCE easily catches fire.
Supplementary Video 3
TMP acts as an effective fire extinguisher, scavenging the active hydrogen radicals and preventing the combustion chain reaction, so the NaFSI–NaNO3–TMP electrolyte shows impressive non-flammability.
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He, J., Bhargav, A., Su, L. et al. Tuning the solvation structure with salts for stable sodium-metal batteries. Nat Energy 9, 446–456 (2024). https://doi.org/10.1038/s41560-024-01469-y
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DOI: https://doi.org/10.1038/s41560-024-01469-y
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