Akademik Veri Yönetim Sistemi
Functional Materials Letters, cilt.18, sa.6, 2025 (SCI-Expanded, Scopus)
In this study, Ba-doped Li3OCl antiperovskite solid electrolytes and their hexagonal boron nitride (hBN)-reinforced composites were successfully synthesized via a hydrothermal method followed by rapid solidification. Liquid-phase exfoliated hBN nanosheets were incorporated at 2 wt.% and 5 wt.% to investigate their effects on the structure and ion transport properties. X-ray diffraction (XRD) analysis revealed a reduction in crystallinity and increased amorphous phase content in the re-melted and hBN-containing samples. Differential scanning calorimetry (DSC) showed a glass transition temperature (Tg) at ∼97∘C for the pure Ba-doped Li3OCl, which shifted to 107∘C upon hBN addition, indicating enhanced thermal stability. Morphological studies confirmed hBN-enhanced densification (82% theoretical density), reducing microporosity and improving interfacial stability. Electrochemical impedance spectroscopy (EIS) revealed that the ionic conductivity of Ba-doped Li3OCl demonstrated ionic conductivities of 0.28 mS/cm (40∘C) and 12 mS/cm (160∘C) for pure samples (Ea=0.32 eV), while 2 wt.% hBN composites achieved 0.77 mS/cm (40∘C) along with the same activation energy. 0.28 mS cm-1 at 40∘C, increasing to 12 mS cm-1 at 140∘C. However, 5 wt.% hBN led to high charge-transfer resistance (130 kω/cm2), underscoring the need for optimal hBN content (<5 wt.%) to balance densification and conductivity. These results demonstrate that a small amount of hBN reinforcement supports densification, improves thermal stability and enables single-step processing, making it a promising strategy for developing antiperovskite-based electrolytes for high-performance solid-state batteries.