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Abstract <p>The phase transformations and crystalline phases precipitated in powders of quenched glasses similar in composition to Li–aegirine (LiFeSi<sub>2</sub>O<sub>6</sub>) subjected to heat treatment in the temperature range of 600–1000°C, are studied by differential scaning calorimetry (DSC) and X-ray diffraction analysis (XRD). The formation of a low-temperature metastable hexagonal lithium–iron silicate crystalline phase with a β-quartz structure is demonstrated for the first time. The conditions for obtaining this phase and the electrochemical properties of the developed material are discussed. In the first charge–discharge cycle, the cell containing a crystalline phase with a β-quartz structure as the anode has a specific capacity of ~400&#xa0;mAh/g, which is more than one-and-a-half times higher than this value for the monoclinic modification of Li–aegirine.</p>

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New Glass-Ceramic of Li–Aegirine Composition Based on β-Quartz Solid Solution and Its Electrochemical Properties

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • V. V. Rusan,
  • I. P. Alekseeva,
  • O. S. Dymshits,
  • D. V. Shemchuk,
  • S. S. Pashin,
  • D. V. Agafonov,
  • L. S. Polyakova,
  • E. V. Sentsova

摘要

Abstract

The phase transformations and crystalline phases precipitated in powders of quenched glasses similar in composition to Li–aegirine (LiFeSi2O6) subjected to heat treatment in the temperature range of 600–1000°C, are studied by differential scaning calorimetry (DSC) and X-ray diffraction analysis (XRD). The formation of a low-temperature metastable hexagonal lithium–iron silicate crystalline phase with a β-quartz structure is demonstrated for the first time. The conditions for obtaining this phase and the electrochemical properties of the developed material are discussed. In the first charge–discharge cycle, the cell containing a crystalline phase with a β-quartz structure as the anode has a specific capacity of ~400 mAh/g, which is more than one-and-a-half times higher than this value for the monoclinic modification of Li–aegirine.