Research on Improving the Electrochemical Performance of LiMn2O4 via Cr-Doping

: Cr was doped into LiMn₂O₄ compound in this study through the traditional solid-state reaction route. The pattern of X-ray diffraction (XRD) revealed that the structure of LiMn₂O₄ had not changed, and scanning electron microscopy (SEM) exhibited that all samples possessed similar morphology. It was seen that all the samples presented more than 100 mAh/g capacity under different discharge current rates. Because partial Mn3+ was replaced by Cr3+, the LiMn2-xCrxO₄ revealed excellent cycling stability. Electrochemical result demonstrated that the optimal content of Cr-doping was 0.02, which had an initial discharged capacity of 133.9 mAh/g at 1C rate. These results suggest a new method for enhancing cycle stability of LiMn₂O₄ materials.