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<p>Polymer electrolytes in lithium batteries typically suffer from low ionic conductivity and unstable interactions with lithium metal, limiting their applicability in high-energy-density systems. To address these challenges, a novel nanoporous filler (Li-IL@CuBTC) was synthesized by encapsulating a lithium-containing ion-conductive liquid within the CuBTC metal–organic framework (MOF), and this filler was incorporated into a polyethylene oxide (PEO) matrix to form a composite polymer electrolyte. The multifunctional filler enhances ion transport, suppresses PEO crystallinity, and improves electrolyte stability. Consequently, the composite polymer electrolyte has a broad electrochemical stability window (5.9&#xa0;V), strong ionic conductivity (1.2 × 10⁻<sup>4</sup> S cm⁻¹ at room temperature), and a high lithium-ion transference number (0.69), along with excellent compatibility with lithium metal. In LFP/PLLC/Li full cells operated at 60&#xa0;°C, the electrolyte delivers outstanding cycling stability, maintaining reversible capacities of 160.5 mAh g⁻¹ after 200 cycles at 0.2&#xa0;C and 151.5 mAh g⁻¹ after 250 cycles at 0.2&#xa0;C and 2&#xa0;C respectively. This study demonstrates an effective strategy for improving composite polymer electrolytes, offering promising potential for safe, durable, and high-energy-density energy storage systems.</p>

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Li-IL@CuBTC-enhanced PEO composite polymer electrolytes for solid-state lithium batteries

  • 期刊论文

  • 发表日期：

    2026年7月4日

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  • Sung Hoon Kim,
  • Neema Cyril Karima,
  • Kelvin Jenerali Nyamtara,
  • Minkyeong Kim,
  • Younghyun Cho,
  • Young-Woo Lee,
  • Jaehan Lee,
  • Yun-Seok Jun,
  • Wook Ahn

摘要

Polymer electrolytes in lithium batteries typically suffer from low ionic conductivity and unstable interactions with lithium metal, limiting their applicability in high-energy-density systems. To address these challenges, a novel nanoporous filler (Li-IL@CuBTC) was synthesized by encapsulating a lithium-containing ion-conductive liquid within the CuBTC metal–organic framework (MOF), and this filler was incorporated into a polyethylene oxide (PEO) matrix to form a composite polymer electrolyte. The multifunctional filler enhances ion transport, suppresses PEO crystallinity, and improves electrolyte stability. Consequently, the composite polymer electrolyte has a broad electrochemical stability window (5.9 V), strong ionic conductivity (1.2 × 10⁻4 S cm⁻¹ at room temperature), and a high lithium-ion transference number (0.69), along with excellent compatibility with lithium metal. In LFP/PLLC/Li full cells operated at 60 °C, the electrolyte delivers outstanding cycling stability, maintaining reversible capacities of 160.5 mAh g⁻¹ after 200 cycles at 0.2 C and 151.5 mAh g⁻¹ after 250 cycles at 0.2 C and 2 C respectively. This study demonstrates an effective strategy for improving composite polymer electrolytes, offering promising potential for safe, durable, and high-energy-density energy storage systems.