Fig. 2

Electrochemical cycling performance of NC and NCA measured in half-cell. a The first charge–discharge cycle at the voltage between 2.8 and 4.4 V. The red and green lines represent the plots of NC and NCA, respectively. The charge–discharge profiles of b NC, c NCA, from 10th to 100th cycles. d Discharge capacity evolution as a function of cycle numbers. Each red and green ring represents the capacity of NCA and NC collected from 1st to 100th cycle