Fig. 2

a CV curves at 50 mV s⁻¹, b GCD curves at 0.5 A g⁻¹, and c Nyquist plots in the frequency range of 100 kHz to 0.01 Hz for all prepared LCOs electrodes at different calcination temperatures and times. d Cycling stability of LCO-700-4 electrode at 100 mV s⁻¹ for 5000 cycles (insert shows the comparison of CV curves at 5th cycle, 2500th cycle, and 5000th cycle)