PAni-coated LiFePO4 synthesized by a low temperature solvothermal method

Abstract

The composite LiFePO4/polyaniline was prepared by chemical synthesis to promote the intensification of the electrochemical properties for use as cathodes in lithium ion batteries. The X-ray diffraction (XRD) of LiFePO4 synthesized by solvothermal method were indexed to the orthorhombic structure, according to the JCPDS 40-1499. The spectra Raman and FTIR showed a high degree of ordering of LiFePO4 with interaction between LiFePO4 surface with structure conjugate of conducting polymers. The cyclic voltammogram of the composite synthesized chemically showed a significant reduction in the value of ΔEp (ΔEp = 0.20 V) when compared to LiFePO4 (ΔEp = 0.41 V), with lower charge transfer resistance values, indicating favoring electron transfer rate in the composite. Thus, the alternative synthesis route of the LiFePO4/PAni composite was easy to handle and allowed an increase in the electrochemical properties of the LiFePO4, compared to the traditional methods that require additional thermal treatments.