CTAB assisted Solution combustion synthesis of Li۳V۲(PO۴)۳/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 Li۳V۲(PO۴)۳/C positive materials were studied. A solution combustion technique was applied to synthesize Li۳V۲(PO۴)۳/C samples by using two different fuel-to-oxidant ratios (φ۰.۵ and φ۱). 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 (φ۱) composites have the highest degree of crystallinity. The scanning electron microscopy (SEM) results indicate that, by increasing the ratio of fuel-to-oxidant to φ۱, the microsphere morphology was obtained, which improve the electrochemical performance. According to electrochemical analysis, the samples with φ۱ have better cyclic performance than others. The sample designated LVP/C (φ۱) exhibits superior electrochemical performance with discharge capacity as high as ۱۰۰.۹۱ mAh g−۱ at ۰.۱ C and ۷۶ mAh g−۱ at ۱۰ C. During the ۲۰۰th cycle, the LVP/C (φ۱) composite maintains ۷۳.۹۳ mAhg−۱ at ۱۰ 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

کلیدواژه ها:

Li۳V۲(PO۴)۳ ، Lithium vanadium phosphate ، Solution combustion ، CTAB ، fuel-to-oxidant.