The performance of LiMn2O4/graphite battery after storing at high temperature

Spinel LiMn₂O₄ was synthesized by a solid-state method. 204468-size battery was fabricated and stored at high temperature. Structure and morphology of the LiMn₂O₄ cathode were observed by XRD and SEM technique, respectively. EDS was used to analyze the surface component of carbon anode. The discharge capacity fading is increasing with the time, but the cyclic performance is improved after storing. The LiMn₂O₄ retained its structure. But the intensity of all LiMn₂O₄ diffraction peaks is weakened. The carbon also retained its structure. But the Mn is detected from the carbon electrode when the battery is stored for 96 h. Cyclic voltammogram curves results show that the resistance and polarization of LiMn₂O₄/electrolyte is increased after storage.