Large-Scale Production of V₆O₁₃ Cathode Materials Assisted by Thermal Gravimetric Analysis-Infrared Spectroscopy...

Area of Science:

• Materials Science
• Electrochemistry
• Analytical Chemistry

Background:

• Vanadium oxide (V₆O₁₃) is a promising cathode material for energy storage applications.
• Current fabrication methods may result in impurities affecting performance.
• In situ thermal gravimetric analysis-infrared spectroscopy (TGA-IR) offers advanced characterization capabilities.

Purpose of the Study:

• To optimize the kilogram-scale fabrication of V₆O₁₃ cathode materials.
• To identify and mitigate impurities in V₆O₁₃ during synthesis.
• To evaluate the electrochemical performance of synthesized V₆O₁₃.

Main Methods:

• In situ TGA-IR technology for real-time analysis during material synthesis.
• Scanning electron microscopy (SEM) for morphological characterization.
• X-ray diffraction (XRD) for structural analysis.
• X-ray photoelectron spectroscopy (XPS) for surface composition analysis.
• Electrochemical testing at 125 °C.

Main Results:

• In situ TGA-IR successfully identified ammonium metavanadate residue in commercial V₆O₁₃, consistent with XPS findings.
• V₆O₁₃ samples fabricated at 500 °C exhibited improved purity.
• Test cells using V₆O₁₃ prepared at 500 °C showed up to a 10% increase in initial specific capacity compared to commercial V₆O₁₃ at 125 °C.

Conclusions:

• In situ TGA-IR is an effective tool for monitoring and improving V₆O₁₃ synthesis.
• Optimized fabrication conditions lead to enhanced electrochemical performance of V₆O₁₃ cathode materials.
• The developed method facilitates kilogram-scale production of high-performance V₆O₁₃ for energy storage.