Structural Changes in Li[sub x]Mn[sub 2]O[sub 4] at 3.7 V Induced by Voltage Excursions below 3.0 V

The peak observed in the cyclic voltammogram of was investigated using the in situ bending beam method and synchrotron X-ray diffraction (XRD). The cyclic voltammogram (CV) at different cutoff voltages revealed the peak during the anodic scan only when the sample was subjected to the range. The differential strain curves obtained simultaneously with the CV indicated the presence of tensile strain in the vicinity of suggesting sample volume contractions due to a phase transformation. Synchrotron XRD confirmed that the material underwent a tetragonal to cubic phase transformation.