“…The cyclic performances of the Na 3 V 2 (PO 4 ) 3 /AC, Na 3 V 2 (PO 4 ) 3 /CNT and Na 3 V 2 (PO 4 ) 3 /graphite electrodes in 2.3 to 3.9 V at 5 C rate are demonstrated in Figure 3 c. The initial discharge capacity of Na 3 V 2 (PO 4 ) 3 /AC cathode is up to 100.6 mAh g −1 , closer to the theoretical capacity than the other two samples. [ 57 ] This is further testifi ed by the discharge profi le of Na 3 V 2 (PO 4 ) 3 /AC at the rate of 0.1 C as indicated in Figure S5. After 200 cycles, the capacities of Na 3 V 2 (PO 4 ) 3 /AC, Na 3 V 2 (PO 4 ) 3 /CNT and Na 3 V 2 (PO 4 ) 3 /graphite cathodes decrease to 97.0, 56.3 and 40.8 mAh g −1 , corresponding to the capacity retention of 96.4%, 65.3% and 65.1% of their initial capacity, respectively.…”