Fig. 5From: Carbon- and Binder-Free NiCo2O4 Nanoneedle Array Electrode for Sodium-Ion Batteries: Electrochemical Performance and Insight into Sodium Storage ReactionComparison of a rate capability and b cycle performance (at 50 mA g−1) of NCO-NNA in Li and Na half-cells. The result for NCO-P was also presented in b Back to article page