Electrochemical Properties Of Limn2o4 Prepared By Solid-State Combustion Synthesis Using Oxalic Acid As A Fuel

Spinel LiMn2O4 of the Fd3m space group was prepared via solid-state combustion synthesis using oxalic acid as a fuel. Its phase structure and microstructure were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM). The electrochemical performance of material was investigated by galvanostatic charge/discharge, cyclic voltammetry (CV) and electrochemical impedance spectra (EIS). The XRD patterns indicate that samples containing oxalic acid are single-crystalline phase of LiMn2O4. SEM images show that samples containing oxalic acid are composed of spherical-like particles whereas the sample without oxalic acid is composed of agglomerated clusters. At 0.2 C, galvanostatic charge/discharge experiments demonstrate that the discharge capacity of samples increases with an increase in oxalic acid content up to 5 wt% and it decreases at an oxalic acid content of >= 10 wt%. The specimen containing 5 wt% oxalic acid possesses the highest initial discharge capacity. CV and EIS results further confirm that this sample has the best electrochemical activity.