Effect of calcining temperature on the electrochemical performance of nanocrystalline LiMn_2O_4 powders prepared by polyethylene glycol (PEG-400) assisted Pechini process

摘要

Nanocrystalline LiMn_2O_4 powders were synthesized by Pechini process using metal nitrates/acetates as metal ion sources, citric acid and polyethylene glycol-400. Effect of calcining temperature on the electrochemical performance of nanocrystalline LiMn_2O_4 powders was investigated. Thermal decomposition of polymeric intermediate was investigated through DSC thermogram. FT-IR was used to identify the structural coordination of as prepared and calcined polymeric intermediate. The phase of the synthesized LiMn_2O_4 powder was confirmed by comparing the obtained XRD patterns with the JCPDS standard. CV and battery cyclic studies showed that the better electrochemical activity for LiMn_2O_4 compound, prepared at 750 deg C, with a discharge capacity of about 110 mAh g~(-1).