The phase transition of chromium substituted lithium manganese spinel oxide, LiCr y Mn2−y O4 was investigated by low-temperature powder X-ray diffractometry (XRD), differential scanning calorimetry (DSC), and electrical resistivity measurements. The sample prepared at 820°C resulted in lowering the transition temperature T t with Cr composition y, whereas T t of the sample prepared at 750°C remained constant for 0≤y≤0.17 in LiCr y Mn2−y O4. This would be caused by a difference in distribution of the substituted Cr3+ ion in octahedral site depending on the preparation temperature. The phase transition was suppressed with increasing the amount of Cr content.