Polyol mediated synthesis and electrochemical performance of nanostructured LiMn₂O₄ cathodes

摘要

Nanoparticulate single phase LiMn2O4 spinel was prepared via polyol method and applied as a cathodein a lithium ion battery. The effects of calcination temperature (250 C 800 C) as well as of post- synthetic treatment by ball milling on the physiochemical and electrochemical properties of LiMn2O4were studied by means of powder XRD, SEM, cyclic voltammetry and charge/discharge cycling. Withincreasing calcination temperature, the electrochemical activity and discharge capacity increased. Themeasurements revealed that the electrochemical performance of LiMn2O4 can be further improved byball milling before calcination. Furthermore, the ball milling process allowed reducing the calcinationtemperature needed to obtain electrochemically active material.