Fig. 3: Electrochemical characterizations of the P2-NaMNNb and P2-NaMN cathode active material at various temperatures.
From: Niobium-doped layered cathode material for high-power and low-temperature sodium-ion batteries
a CV curves of P2-NaMNNb and P2-NaMN at a scan rate of 0.2 mV s−1 at 25 °C. b CV curves of P2-NaMNNb and P2-NaMN at a scan rate of 0.2 mV s−1 at −40 °C. c GITT curves of P2-NaMNNb at 25 °C and −40 °C. d The corresponding sodium ion diffusion coefficient (DNa+) of P2-NaMNNb calculated from GITT formula at 25 °C and −40 °C.
