Abstract
Spinel LiNi0.5Mn1.5O4 and LiMn1.4Cr0.2Ni0.4O4 cathode materials have been successfully synthesized by the sol–gel method using citric acid as a chelating agent. The structure and electrochemical performance of these as-prepared powders have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and the galvanostatic charge–discharge test in detail. XRD results show that there is a small Li y Ni1-y O impurity peak placed close to the (4 0 0) line of the spinel LiNi0.5Mn1.5O4, and LiMn1.4Cr0.2Ni0.4O4 has high phase purity, and the powders are well crystallized. SEM indicates that LiMn1.4Cr0.2Ni0.4O4 has a slightly smaller particle size and a more regular morphological structure with narrow size distribution than those of LiNi0.5Mn1.5O4. Galvanostatic charge–discharge testing indicates that the initial discharge capacities of LiMn1.4Cr0.2Ni0.4O4 and LiNi0.5Mn1.5O4 cycled at 0.15 C are 129.6 and 130.2 mAh g−1, respectively, and the capacity losses compared to the initial value, after 50 cycles, are 2.09% and 5.68%, respectively. LiMn1.4Cr0.2Ni0.4O4 cathode has a higher electrode coulombic efficiency than that of the LiNi0.5Mn1.5O4 cathode, implying that Ni and Cr dual substitution is beneficial to the reversible intercalation and de-intercalation of Li+.
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The authors thank Prof. Xinguo Hu of Harbin Institute of Technology and Dr. Ying Wang of Institute of Chemistry, Chinese Academy of Sciences for their helpful discussion on the experimental techniques.
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Yi, TF., Li, CY., Zhu, YR. et al. Comparison of structure and electrochemical properties for 5 V LiNi0.5Mn1.5O4 and LiNi0.4Cr0.2Mn1.4O4 cathode materials. J Solid State Electrochem 13, 913–919 (2009). https://doi.org/10.1007/s10008-008-0628-x
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DOI: https://doi.org/10.1007/s10008-008-0628-x