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<p>Spinel LiNi<sub>0.5</sub>Mn<sub>1.475</sub>Al<sub>0.025</sub>O<sub>4</sub> (LNMA) cathode materials doped with Mg, Zn and Cu were synthesized via the solid-state route. The thermal, structural, vibrational, and optical properties of LiNi<sub>0.5</sub>Mn<sub>1.475</sub>Al<sub>0.025</sub>O<sub>4</sub> (LNMA), LiNi<sub>0.45</sub>Mg<sub>0.05</sub>Mn<sub>1.475</sub>Al<sub>0.025</sub>O<sub>4</sub> (LNMA-Mg), LiNi<sub>0.45</sub>Zn<sub>0.05</sub>Mn<sub>1.475</sub>Al<sub>0.025</sub>O<sub>4</sub> (LNMA-Zn), and LiNi<sub>0.45</sub>Cu<sub>0.05</sub>Mn<sub>1.475</sub>Al<sub>0.025</sub>O<sub>4</sub> (LNMA-Cu) materials investigated. The X-ray diffraction (XRD) analysis revealed that all the prepared cathode materials exhibited a cubic spinel structure with disordered Fd-3&#xa0;m space group. Doping with Mg, Zn and Cu cations resulted in a more disordered cation distribution in the LNMA lattice, which may influence the electronic structure and optical properties of the materials. The average crystallite size was found in (44.32 to 47.68&#xa0;nm) and lattice parameters were 8.1554, 8.1409, 8.1580 and 8.1569&#xa0;Å for LNMA, LNMA-Mg, LNMA-Zn and LNMA-Cu. And Rietveld refinement of XRD data confirmed the high crystallinity of the investigated materials. Fourier-transform infrared (FTIR) and Raman spectroscopies identified absorption peaks associated with Mn–O and Ni–O bond vibrations, further supporting the cubic spinel structure with a minor P4<sub>3</sub>32 phase. All synthesized cathodes materials exhibited optical absorption in visible range, as evidenced by luminescence spectroscopy (PL) and Ultraviolet visible spectroscopy (Uv–Visible) spectra. The calculated optical bandgap energies were 1.85 ± 0.01, 1.83 ± 0.01, 1.78 ± 0.01 and 1.73 ± 0.01&#xa0;eV for LNMA, LNMA-Mg, LNMA-Zn and LNMA-Cu, respectively.</p>

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Investigation of thermal, structural, vibrational spectroscopic and optical properties of LiNi0.45M0.05Mn1.475Al0.025O4 (M = Mg, Zn, and Cu) cathode materials

  • 期刊论文

  • 发表日期：

    2026年1月9日

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  • Lulit Beyene,
  • Tekalign Basa,
  • Mahamed Kunta,
  • Belete Tilahun,
  • Baye Zinabe,
  • Ritesh Verma,
  • Mohd Hashim,
  • Neeta Raj Sharma,
  • Jiexi Wang,
  • Paulos Taddesse

摘要

Spinel LiNi0.5Mn1.475Al0.025O4 (LNMA) cathode materials doped with Mg, Zn and Cu were synthesized via the solid-state route. The thermal, structural, vibrational, and optical properties of LiNi0.5Mn1.475Al0.025O4 (LNMA), LiNi0.45Mg0.05Mn1.475Al0.025O4 (LNMA-Mg), LiNi0.45Zn0.05Mn1.475Al0.025O4 (LNMA-Zn), and LiNi0.45Cu0.05Mn1.475Al0.025O4 (LNMA-Cu) materials investigated. The X-ray diffraction (XRD) analysis revealed that all the prepared cathode materials exhibited a cubic spinel structure with disordered Fd-3 m space group. Doping with Mg, Zn and Cu cations resulted in a more disordered cation distribution in the LNMA lattice, which may influence the electronic structure and optical properties of the materials. The average crystallite size was found in (44.32 to 47.68 nm) and lattice parameters were 8.1554, 8.1409, 8.1580 and 8.1569 Å for LNMA, LNMA-Mg, LNMA-Zn and LNMA-Cu. And Rietveld refinement of XRD data confirmed the high crystallinity of the investigated materials. Fourier-transform infrared (FTIR) and Raman spectroscopies identified absorption peaks associated with Mn–O and Ni–O bond vibrations, further supporting the cubic spinel structure with a minor P4332 phase. All synthesized cathodes materials exhibited optical absorption in visible range, as evidenced by luminescence spectroscopy (PL) and Ultraviolet visible spectroscopy (Uv–Visible) spectra. The calculated optical bandgap energies were 1.85 ± 0.01, 1.83 ± 0.01, 1.78 ± 0.01 and 1.73 ± 0.01 eV for LNMA, LNMA-Mg, LNMA-Zn and LNMA-Cu, respectively.