Mo-doped Na3V2(PO4)(3)@C composites for high stable sodium ion battery cathode

NASICON-type Na3V2(PO4)(3) (NVP) with superior electrochemical performance has attracted enormous attention with the development of sodium ion batteries. The structural aggregation as well as poor conductivity of NVP hinder its application in high rate perforamance cathode with long stablity. In this paper, Na3V2-x Mo (x) (PO4)(3)@C was successfully prepared through two steps method, including sol-gel and solid state thermal reduction. The optimal doping amount of Mo was defined by experiment. When x was 0.15, the Na3V1.85Mo0.15(PO4)(3)@C sample has the best cycle performance and rate performance. The discharge capacity of Na3V1.85Mo0.15(PO4)(3)@C could reach 117.26 mA.h.g(-1) at 0.1 C. The discharge capacity retention was found to be 94.5% after 600 cycles at 5 C.