Fig. 4: Electrochemical energy storage performance of Na||P2-NaMNNb and Na||P2-NaMN coin cells at various temperatures.
From: Niobium-doped layered cathode material for high-power and low-temperature sodium-ion batteries
a The rate performance comparison of Na||P2-NaMNNb and Na||P2-NaMN at 25 °C. b Charge and discharge curves of Na||P2-NaMNNb at various rates at 25 °C. c The rate performance comparison of Na||P2-NaMNNb and Na||P2-NaMN at −40 °C. d Charge and discharge curves of Na||P2-NaMNNb at various rates at −40 °C. e Charge and discharge curves of Na||P2-NaMNNb coin cells at various cycle numbers at −40 °C and 368 mA g−1. f EIS curves of P2-NaMNNb and P2-NaMN at 25 °C and −40 °C. g Long-term cycling stability at rates of 92 and 368 mA g−1 at −40 °C.
