Novel NaSICON-type structure Iron/ Vanadium phosphate-based as cathode for Lithium-ion Batteries

NaSICON-type structure phosphates were widely investigated as cathode and anode candidates for high energy density lithium-ion batteries. Li3V2(PO4)3 reported with the
highest theoretical capacity of 197 mAh g−1. However, the material suffers from sluggish kinetics upon the extraction of the third Li+ ion due to the low electronic conductivity of
V2(PO4)3 framework. Therefore, the substitution of vanadium with eco-friendly and cheap iron was targeted for this work. Novel NaSICON-type structure phosphate Li3V2-xFex(PO4)3 (LVFP) was synthesized using one step reaction via sol-gel route. The electrochemical properties of the obtained material were enhanced by the optimization of the electrolyte and the voltage range. As shown in Fig. 1, this material delivers a reversible capacity of 150 mAh g-1 with 99% coulombic efficiency after 55 cycles. Furthermore, this
material was studied using 57Fe Mossbauer spectroscopy, Xray absorption spectroscopy and magnetic measurements. The findings of this study will be communicated during this
conference.