Impact of the Cyclic-to-Linear Carbonate Ratio in EC-DEC-DMC Electrolytes on the Low-Temperature Performance of Sodium-Ion Batteries Comprising Metallic Sodium and Intercalation-Type Electrodes

Lutsenko, D.S.; Belova, E.V.; Zakharkin, M.V.; Drozhzhin, O.A.; Antipov, E.V.

Авторы: Lutsenko D.S., Belova E.V., Zakharkin M.V., Drozhzhin O.A., Antipov E.V.
Журнал: Journal of the Electrochemical Society
Том: 172
Номер: 11
Год издания: 2025
Издательство: Electrochemical Society, Inc.
Местоположение издательства: United States
Первая страница: 110543
DOI: 10.1149/1945-7111/ae1e36
Аннотация: The low-temperature properties of sodium-ion electrolytes based on 1 M NaPF6 solutions in EC-DEC-DMC (2:1:1 and 1:1:1 by volume) were studied. The data on phase transitions obtained from visual experiments and DSC studies were compared with the results of electrochemical experiments using steel (St), metallic sodium (Na), and NASICON-type active materials (NVP, NTP) electrodes. The specific conductivity of the “2:1:1” electrolyte, although initially slightly higher than that of the “1:1:1,” decreases sharply upon cooling and at −40 °C is ≈0.5 mS cm −1 vs ≈1.5 mS cm −1 for the “1:1:1.” However, the capacities of NVP-Na halfcells in both electrolytes are almost identical down to −40 °C. Studies of symmetrical cells showed that the main contributor to polarization loss is the sodium-electrolyte interface. Both electrolytes behave similarly with respect to metallic sodium. However, in the case of NVP-NVP cells, the charge transfer resistance in case of “1:1:1” electrolyte was lower on cooling than for the “2:1:1.” NVP-NTP full cells additionally demonstrated an advantage of the “1:1:1” system compared to “2:1:1” at low temperatures. At −40 °С, the cell with “1:1:1” electrolyte demonstrated retention of 75% of the room-temperature capacity, while in the case of “2:1:1” this value was slightly more than 50%.
Добавил в систему: Луценко Денис Сергеевич

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Impact of the Cyclic-to-Linear Carbonate Ratio in EC-DEC-DMC Electrolytes on the Low-Temperature Performance of Sodium-Ion Batteries Comprising Metallic Sodium and Intercalation-Type Electrodesстатья

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