NASICON-PEO (Polyethylene Oxide) Polymer-in-Ceramic Composite Electrolytes: Thermal, Structural and Electrical Properties
DOI:
https://doi.org/10.48048/tis.2025.9672Keywords:
Composite electrolyte, NASICON (LSPO), Polymer electrolyte, PEO-LiTFSI electrochemical impedance spectroscopy (EIS), Thermal stability, Bulk conductivityAbstract
A composite electrolyte consisting of sodium super ionic conductor (NASICON) LiSn2P3O12 (LSPO) and a polymer electrolyte (80:20 polyethylene oxide (PEO) with LiTFSI salt) was prepared using the solution casting method. The thermal stability of the composite was assessed, revealing a second-stage decomposition temperature range between 375 and 462 °C, with a glass transition temperature (Tg) of 28 °C. X-ray diffraction (XRD) analysis indicated low crystallinity in PEO-LiTFSI, with no significant structural changes, despite the emergence of a new peak at 20.7 °C. Electrochemical impedance spectroscopy (EIS) was used to investigate the electrical properties at seven different temperatures (30, 40, 50, 60, 70, 80 and 90 °C), with the highest bulk conductivity of 6.2825×10−5 S/cm observed at 50 °C. The results demonstrate that the addition of LSPO ceramic electrolyte and temperature significantly influence the thermal, structural, and electrical properties of the composite electrolyte.
HIGHLIGHTS
- This article focused on composite electrolyte consisting of NASICON, LiSn2P3O12 (LSPO) and a polymer
electrolyte (80:20 PEO with LiTFSI salt) prepared using the solution casting method.
- The thermal and structural properties of the material indicate good thermal stability and a predominantly crystalline structure, which are favourable characteristics for solid-state electrolyte applications.
- Electrochemical studies found the highest ionic conductivity of 6.2825 × 10⁻⁵ S/cm at 50 °C, highlighting the role of LSPO and temperature on electrolyte performance.
- These findings suggest that the LSPO–PEO composite electrolyte is a promising candidate for solid-state sodium-ion battery applications due to its enhanced thermal and electrochemical properties.
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