Fig. 1: Electrolyte design strategy. Illustration of solvent distributions in the electrolyte during the battery charging process. | Nature Communications

Fig. 1: Electrolyte design strategy. Illustration of solvent distributions in the electrolyte during the battery charging process.

From: Directing selective solvent presentations at electrochemical interfaces to enable initially anode-free sodium metal batteries

Fig. 1

The cation solvation shells are enriched in 2-MeTHF, which results in the generation of a stable Na|electrolyte interface under reductive conditions. Meanwhile, THF is weakly bonded to cations and accumulates on the positive electrode to prevent oxidation. The developed 1.8 M NaPF6 in THF/2-MeTHF electrolyte promotes the formation of a selective solvent presentation at different electrochemical interfaces, collectively enhancing the reversibility and calendar life of the initially anode-free Na metal batteries.

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