Fig. 2: Nyquist plots of P2-NFMO-LV electrode upon the first cycle. | Communications Chemistry

Fig. 2: Nyquist plots of P2-NFMO-LV electrode upon the first cycle.

From: Role of the voltage window on the capacity retention of P2-Na2/3[Fe1/2Mn1/2]O2 cathode material for rechargeable sodium-ion batteries

Fig. 2: Nyquist plots of P2-NFMO-LV electrode upon the first cycle.

In the top panels, during first Na+ extraction: at 2.53 V (red point), 3.46 V (green hexagon), 3.69 V (blue square), 4.02 V (black rhombus), 4.15 V (navy triangle), and 4.25 V (pink pentagon) in the frequency range of a 100 kHz to 5 mHz and b 100 kHz to 1 Hz/50 mHz which is a zoom-in of the very low real impedance component. In the bottom panels, during first Na+ insertion: at 4.25 V (pink pentagon), 3.45 V (red hexagon), 2.64 V (blue point), 2.42 V (black square), 2.19 V (green triangle), 2.07 V (brown rhombus), and 1.50 V (orange square) in the frequency range of c 100 kHz to 5 mHz and d 100 kHz to 1 Hz/50 mHz which is a zoom-in of the very low real impedance component. The LF region is highlighted in blue.

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