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Ethylene Carbonate-based Concentrated Electrolyte Composed of Asymmetric Amide Anion for Rechargeable Sodium-ion Batteries (Supporting Information)

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posted on 2024-07-08, 05:51 authored by Yoshiki YOKOYAMA, Reita FURUI, Shiro SEKI
The phase behavior, Na+ coordination structure, Na+ conduction and transport properties, and battery performance of liquid electrolytes comprising sodium (fluorosulfonyl) (trifluoromethylsulfonyl) amide (NaFTA) and ethylene carbonate (EC) are investigated. A highly concentrated electrolyte with a molar ratio of EC/NaFTA = 1.5 is shown to exhibit a stable liquid state at room temperature. It is revealed that Na+ in the concentrated electrolyte coordinates—not only with EC but also with anions—to satisfy stable coordination numbers. From this specific coordination structure, dynamic ligand exchange of Na+ is shown to be enhanced, and [Na | NaFTA+1.5EC | Na0.44MnO2] cells are shown to achieve stable cycling performance by constant charge-discharge tests at 303 K.

Funding

Development of sodium ion batteries free of resource constraints

Japan Science and Technology Agency

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Corresponding author email address

shiro-seki@cc.kogakuin.ac.jp

Copyright

© 2024 The Author(s).

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