Structural and Electrochemical Properties of the High Ni Content Spinel LiNiMnO4

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2021
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American English
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This work presents a contribution to the study of a new Ni-rich spinel cathode material, LiNiMnO4, for Li-ion batteries operating in the 5-V region. The LiNiMnO4 compound was synthesized by a sol-gel method assisted by ethylene diamine tetra-acetic acid (EDTA) as a chelator. Structural analyses carried out by Rietveld refinements and Raman spectroscopy, selected area electron diffraction (SAED) and X-ray photoelectron (XPS) spectroscopy reveal that the product is a composite (LNM@NMO), including non-stoichiometric LiNiMnO4-δ spinel and a secondary Ni6MnO8 cubic phase. Cyclic voltammetry and galvanostatic charge-discharge profiles show similar features to those of LiNi0.5Mn1.5O4 bare. A comparison of the electrochemical performances of 4-V spinel LiMn2O4 and 5-V spinel LiNi0.5Mn1.5O4 with those of LNM@NMO composite demonstrates the long-term cycling stability of this new Ni-rich spinel cathode. Due to the presence of the secondary phase, the LNM@NMO electrode exhibits an initial specific capacity as low as 57 mAh g−1 but shows an excellent electrochemical stability at 1C rate for 1000 cycles with a capacity decay of 2.7 × 10−3 mAh g−1 per cycle.

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Li, T., Chang, K., Hashem, A. M., Abdel-Ghany, A. E., El-Tawil, R. S., Wang, H., El-Mounayri, H., Tovar, A., Zhu, L., & Julien, C. M. (2021). Structural and Electrochemical Properties of the High Ni Content Spinel LiNiMnO4. Electrochem, 2(1), Article 1. https://doi.org/10.3390/electrochem2010009
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2673-3293
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Electrochem
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