An Electrochemical Study of Sb/Acetylene Black Composite as Anode for Sodium-Ion Batteries

Sb/acetylene black (Sb/AB) composite was firstly applied as anode for sodium-ion batteries (SIBs). A great electrochemical performance of the composite was obtained when utilizing this composite for SIBs. It was found that the charge capacity can reach 473 mAh g−1 in the 70th cycle at a current density of 100 mA g−1, and we also note that the capacity contributed by Sb was about 624 mAh g−1, which is very close to its theoretical sodium storage capacity (660 mAh g−1 corresponding to a formula of Na3Sb), demonstrating the full utilization of Sb. It is interesting to see that even at a high current density of 1600 mA g−1, the capacity can still reach 281 mAh g−1.