Synthesis and Electrochemical Characteristics of Cathode Materials Li_3V_(2-2x/3)Mn_x(PO_4)_3/C

Composite cathode material Li3V(2-2x/3)Mnx(PO4)3/C(x=0,0.03,0.06,0.09,0.12) was obtained from chemical reduction and lithiation method by using V2O5,NH4H2PO4,Li2CO3,and(CH3COO)2Mn·4H2O as raw materials and glucose and ascorbic acid as reductant and carbon source.The structure and electrochemical performances of Li3V(2-2x/3)Mnx(PO4)3/C was characterized by XRD,SEM,and galvanostatic charge /discharge.The results of electrochemical measurements showed that Mn-doping can improve the electrochemical performance in significant measure.When x=0.09,the electrochemical performance was better than that of others and its initial discharge capacity was 131 mAh/g at 0.2 C.There was only 4.02% capacity fade observed after 50 cycles.