فهرست نشریات علمی دسترسی آزاد ایران

In this study, the spinel compound LiMn2O4 was manufactured as the cathode active material for Li-ion batteries via the sol–gel process. The field-emission scanning electron microscope (FESEM) was employed for an evaluative analysis of the external surface morphology of the synthesized material. The crystal structure of the spinel material was confirmed using X-ray diffractometry (XRD). The XRD graph exhibited no signs of impurity peaks, confirming a singular crystal structure phase. As per the Scherrer equation, the crystal size was estimated at 31.98 nm. The energy-dispersive X-ray spectroscopy (EDX) spectra for the equipped sample showed the existence of manganese and oxygen, and the concentrations were very close to the elemental composition used. Electrochemical attributes were investigated through galvanostatic charge–discharge (GCD) cycling and cyclic voltammetry (CV) in a voltage range of 2.5 to 4.8 V. The LiMn2O4sample displayed a charge capacity of 116.5 mAhg-1 and a discharge capacity of 114.3 mAhg-1. The Coulombic efficiency exhibited by this electrode was 98.1%. After 100 cycles, the capacity retention was as high as 75.8%. The electrochemical impedance spectroscopy (EIS) measurements of the LiMn2O4 electrode, including the electrolyte bulk resistance (Rs), charge transfer resistance (Rct), and Warburg Impedance (Wo), were 13.3 ohms, 118.7 ohms, and 0.61 ohms, respectively.