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<p>Polymer electrolytes offer improved safety and stability over liquid electrolytes by eliminating leakage, making them highly promising for energy storage applications. However, their practical use in high-performance devices is still limited by relatively low ionic conductivity. Among the fabricated systems, the Poly(acrylonitrile-co-methyl methacrylate) P(AN-co-MMA)/Lithium bis(trifluoromethanesulfonic)imide (LiTFSI)/Niobium pentoxide Nb<sub>2</sub>O<sub>5</sub> (20 wt%) membrane demonstrates superior physicochemical and electrochemical performance, attributed to its synergistically optimized structural characteristics. The membrane exhibits high porosity (~ 62%) and remarkable electrolyte uptake (~ 249%), thereby promoting efficient ionic transport pathways. The reduced degree of crystallinity (~ 49%) together with enhanced thermal stability significantly contributes to the high room-temperature ionic conductivity of 3.90 × 10<sup>–4</sup> S cm<sup>−1</sup>. Additionally, the membrane possesses excellent mechanical integrity, delivering a tensile strength of 8.5&#xa0;MPa and an elongation at break of 38%. Furthermore, the electrolyte membrane exhibits a favorable Li⁺ transference number (0.58), a wide electrochemical stability window of 4.6&#xa0;V, and a low activation energy of 0.30&#xa0;eV. Overall, the synergistic combination of high conductivity, excellent electrolyte affinity, and stable electrochemical performance highlights its strong potential for next-generation energy storage systems.</p>

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Nb2O5-enhanced P(AN-co-MMA)/LiTFSI composite polymer electrolytes: improved ionic conductivity and electrochemical properties for energy storage

  • 期刊论文

  • 发表日期：

    2026年5月27日

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  • S. P. Vijayachamundeeswari,
  • Mohan Jagan

摘要

Polymer electrolytes offer improved safety and stability over liquid electrolytes by eliminating leakage, making them highly promising for energy storage applications. However, their practical use in high-performance devices is still limited by relatively low ionic conductivity. Among the fabricated systems, the Poly(acrylonitrile-co-methyl methacrylate) P(AN-co-MMA)/Lithium bis(trifluoromethanesulfonic)imide (LiTFSI)/Niobium pentoxide Nb2O5 (20 wt%) membrane demonstrates superior physicochemical and electrochemical performance, attributed to its synergistically optimized structural characteristics. The membrane exhibits high porosity (~ 62%) and remarkable electrolyte uptake (~ 249%), thereby promoting efficient ionic transport pathways. The reduced degree of crystallinity (~ 49%) together with enhanced thermal stability significantly contributes to the high room-temperature ionic conductivity of 3.90 × 10–4 S cm−1. Additionally, the membrane possesses excellent mechanical integrity, delivering a tensile strength of 8.5 MPa and an elongation at break of 38%. Furthermore, the electrolyte membrane exhibits a favorable Li⁺ transference number (0.58), a wide electrochemical stability window of 4.6 V, and a low activation energy of 0.30 eV. Overall, the synergistic combination of high conductivity, excellent electrolyte affinity, and stable electrochemical performance highlights its strong potential for next-generation energy storage systems.