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Improved electrochemical performance of Li-excessive LiMn2O4 cathode for secondary batteries

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Abstract

Li-excessive Li1+xMn2-xO4-δ (x = 0, 0.05 and 0.1) thin films were prepared by a sol-gel method where the gel deposit on Pt/Ti/SiO2/Si substrate was annealed at 700 °C for 6 h in air. The physical properties of the samples were characterized by X-ray diffraction (XRD) and Raman spectroscopy. The electrochemical properties of the thin-film Li1+xMn2-xO4-δ cathodes were investigated by cyclic voltammetry and galvanostatic cycling test. As a result of XRD analysis, all samples showed a spinel structure without any secondary phase, and the lattice parameter of the Li-excessive samples was reduced compared to the pristine LiMn2O4. The observed high-energy shift of the Raman-active A1g mode for the Li-excessive samples compared to the pristine LiMn2O4 supports the reduction of the lattice parameter. The electrochemical data revealed that the Li-excessive cathodes exhibited better cycling stability than the pristine LiMn2O4 in the 3.5−4.5 V range. The Li1.1Mn1.9O4-δ cathode showed a capacity retention of about 51.1% after 700 cycles for the secondary battery, which is about 26% higher than that of the pristine LiMn2O4.

Graphical Abstract

Highlights

  • The Li1+xMn2-xO4-δ (x = 0, 0.05, and 0.1) thin films were prepared by sol-gel and spin coating technique.

  • The XRD and Raman analysis confirmed the reduction of the lattice parameter.

  • Cyclic Voltammetry results show that Li1.1Mn1.9O4-δ cathode exhibits a larger diffusion coefficient (\({D}_{{Li}}\)) compared to pristine LiMn2O4.

  • The Li-excessive cathodes exhibited better capacity retention than the pristine LiMn2O4 cathode.

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Acknowledgements

This work was supported by Konkuk University, Seoul, South Korea.

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  1. Department of Physics, Konkuk University, Seoul, 05029, South Korea

    Jongho Park & Kwang Joo Kim

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  1. Jongho Park
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Park, J., Kim, K.J. Improved electrochemical performance of Li-excessive LiMn2O4 cathode for secondary batteries. J Sol-Gel Sci Technol (2024). https://doi.org/10.1007/s10971-024-06403-y

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