| Electrochemical impedance spectroscopy, high-frequency resistance | For LiNO₃ 0.35 M and Li–NaNO₃ 0.1–0.25 M, the high-frequency resistance is similar, around 2.5–3 Ohms |
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| Electrochemical impedance spectroscopy, phase dependency to frequency | At high frequencies between 10² and 10⁴ Hz, the first phenomenon corresponds to the electrochemical double layer happening in parallel to the charge transfer. At low frequencies, the phase increases up to −30–35° for all three samples at 10 mHz, characteristic of the diffusion processes. The lithium-only containing electrolytes show an inflexion at ~100 mHz, while the mixed electrolyte Bode diagram shows no inflexion |
| Electrochemical impedance spectroscopy fitting, LiNO₃ 0.1 M and Li–NaNO₃ 0.1–0.25 M | Rd4 and τd4 increase from 3 to 12 Ω and 0.06 to 2 seconds, respectively |
Caroline Keller, Corentin Bourdiol, Emmanuel Billy. “Investigating sodium hindering during electrochemical lithium extraction with LiFePO₄ for Li-ion battery recycling.” ChemRxiv (). https://doi.org/10.26434/chemrxiv.15007737/v1
Values presented only in electrochemical plots or images were not transcribed. Textual X-ray diffraction and inductively coupled plasma optical emission spectroscopy results were not found in the main paper. The main paper refers to supporting information, but no separate supporting information file was found among the files available from the ChemRxiv record
| Electrochemical impedance spectroscopy fitting, Q2 | Q2 increases four times when the electrode is calendered |
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| Electrochemical impedance spectroscopy fitting, Rd4 and τ4 | Rd4 and τ4 decrease from 12 to 7 Ω and 2 to 0.9 s for 0t and 2t, respectively |