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The structural and electrochemical characterizations of o-LiMnO2 synthesized by one-step hydrothermal process

M. CİHAD KÜÇÜKARSLAN1,2,* , ÖZLEM DUYAR COŞKUN1

Affiliation

  1. Hacettepe University, Department of Physics Engineering, Thin Film Preparation and Characterization Laboratory, Beytepe, Ankara 06800, Turkey
  2. Hacettepe University, Institute of Science, Department of Physics Engineering, Beytepe, Ankara 06800, Turkey

Abstract

Lithium-ion batteries have been widely researched for academic and industrial applications owing to their high energy density, safety, versatility, and long life in recent years. The cathode material plays a crucial role in determining the energy density, voltage, and overall battery performance. Among cathode materials, o-LiMnO₂ has a higher energy density and operating voltage than its counterparts in other phases and structures. Herein, we successfully synthesized o-LiMnO2 without impurities or secondary phase formation by controlling the temperature of hydrothermal synthesis. We have investigated the surface morphology of the synthesized LiMnO₂ nanoparticles using SEM method. The structural properties obtained using XRD and XPS. These results demonstrate that temperature plays a critical role in determining the phase purity and crystallinity of the sample. The purest orthorhombic structure of the LiMnO₂ nanoparticles was observed for the sample synthesized at 200°C for 14 h. LiMnO2 based electrode (LiMnO2:CB:PVA (80:11:9)) were coated onto an ITO/glass substrate using the Dr. Blade method. Then, the electrochemical properties of electrode were investigated using the three-electrode method. The highest amounts of intercalated and deintercalated charge densities were obtained for the purest orthorhombic LiMnO₂ phase. This simple and efficient synthesis method are a promising approach for future studies of o-LiMnO₂, as it has improved structural stability and electrochemical properties compared to other LiMnO₂ polymorphs, making it a potential candidate for use in high-performance lithium-ion batteries..

Keywords

Cathode, Orthorhombic LiMnO2, Hydrothermal synthesis, Electrochemical properties.

Submitted at: June 4, 2025
Accepted at: Feb. 4, 2026

Citation

M. CİHAD KÜÇÜKARSLAN, ÖZLEM DUYAR COŞKUN, The structural and electrochemical characterizations of o-LiMnO2 synthesized by one-step hydrothermal process, Journal of Optoelectronics and Advanced Materials Vol. 28, Iss. 1-2, pp. 86-93 (2026)