CTAB assisted Solution combustion synthesis of Li3V2(PO4)3/C cathode material: Effect of fuel-to-oxidant ratio and different carbon sources

The effects of fuel-to-oxidant ratio and different carbon sources on the electrochemical properties of Li3V2(PO4)3/C positive materials were studied. A solution combustion technique was applied to synthesize Li3V2(PO4)3/C samples by using two different fuel-to-oxidant ratios (φ0.5 and φ1). In this work, CTAB was used as a fuel and carbon source. Also, sucrose was used as an extra carbon source. The structural and electrochemical properties were analyzed by different characterization techniques. X-ray diffraction patterns show that the LVP/C (φ1) composites have the highest degree of crystallinity. The scanning electron microscopy (SEM) results indicate that, by increasing the ratio of fuel-to-oxidant to φ1, the microsphere morphology was obtained, which improve the electrochemical performance. According to electrochemical analysis, the samples with φ1 have better cyclic performance than others. The sample designated LVP/C (φ1) exhibits superior electrochemical performance with discharge capacity as high as 100.91 mAh g−1 at 0.1 C and 76 mAh g−1 at 10 C. During the 200th cycle, the LVP/C (φ1) composite maintains 73.93 mAhg−1 at 10 C charge and discharge rate. The current study provides a useful method for producing lithium metal phosphates by utilizing CTAB as fuel and selecting the right fuel-to-oxidant molar ratio to enhance conductivity and, consequently, electrochemical performance

CTAB assisted Solution combustion synthesis of Li3V2(PO4)3/C cathode material: Effect of fuel-to-oxidant ratio and different carbon sources Keywords:

Li3V2(PO4)3 , Lithium vanadium phosphate , Solution combustion , CTAB , fuel-to-oxidant.