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Research on Improving the Electrochemical Performance of LiMn₂O₄ via Cr-Doping
Jianbing Jiang1, Wei Li1, Haojie Deng1
1College of Packaging and Material Engineering, Hunan University of Technology, Zhuzhou, 412007, China.
Abstract:
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-CrO₄ 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.
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