Synthesis of LiFe1-2/3xCrxV1/3xPO4 compound using the solvothermal-microwave irradiation method

Abstract

This research was conducted to synthesize LiFe1-2/3xCrxV1/3xPO4 (x = 0; 0.01; 0.03; 0.05; 0.1) using the combination of solvothermal-microwave irradiation method and to analyze the characteristics of LiFe1-2/3xCrxV1/3xPO4 including their crystal structures, space groups, lattice parameters, and morphologies. Characterizations of LiFe1-2/3xCrxV1/3xPO4 (x = 0; 0.01; 0.03; 0.05; 0.1) were carried out using X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS) and Scanning Electron Microscope-Energy Dispersive X-Ray (SEM_EDX) Spectroscopy techniques. LiFe1-2/3xCrxV1/3xPO4 crystal structures were analyzed by refining the XRD data with U-Fit program. LiFe1-2/3xCrxV1/3xPO4 (x = 0; 0.01; 0.03; 0.05; 0.1) were successfully synthesized using solvothermal-microwave irradiation method. Based on the XRD analysis, the characterization shows that LiFe1-2/3xCrxV1/3xPO4 (x = 0; 0.01; 0.03; 0.05; 0.1) formed are types of crystalline which are not so pure. Crystal size analysis shows a decrease as mole x ratio increases. The crystal structure analysis obtains orthorhombic crystal with Pnma space group. The lattice parameter decreases along with the increasing mole ratio x. The oxidation states of Fe, P, O and Cr were found to be 2+/3+, 5+, 2+ and 3+, respectively as revealed by X-ray Photoelectron Spectroscopy. The results of SEM-EDX analysis shows that the addition of Cr-doping works as proven by the EDX result in LiFe0,967Cr0,05V0,0167PO4.