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<p>To address the safety and performance challenges of lithium-ion batteries, particularly the risk of thermal runaway and inefficient ion transport, we developed a hydroxyethyl cellulose (HEC)/nonwoven fabric (NWF) composite membrane with high mechanical strength and a vertically aligned porous structure. The membrane integrates the mechanical robustness of biodegradable HEC with the thermal and chemical stability of the NWF substrate. Vertically aligned pores were formed via ethanol-induced phase separation under vacuum, facilitating rapid ion transport. Mercury porosimetry analysis confirmed an increased porosity (69.6%) with a well-defined pore size distribution. The membrane demonstrated a high ethanol flux (2659 ± 88 L/m<sup>2</sup>·h), low Gurley value (26.0 ± 13.3&#xa0;s/100&#xa0;mL), an ultra-hydrophilic contact angle of 19.8 ± 6.2°, and enhanced ion exchange capacity (1.3 × 10<sup>−3</sup>&#xa0;meq/g), demonstrating excellent permeation and wettability properties. Intermolecular interactions between HEC and NWF were supported by FT-IR. Thermogravimetric analysis further showed improved thermal stability after phase separation. These results suggest that the fabricated membrane holds promise as a highly porous and thermally stable separator exhibiting superior permeation and wettability, thereby enhancing the safety and ionic conductivity of lithium-ion batteries.</p>

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Fabrication and characterization of porous hydroxyethyl cellulose-coated nonwoven membranes via NIPS: enhanced permeability and structural properties

  • 期刊论文

  • 发表日期：

    2025年12月3日

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  • Hyojeong Sim,
  • Sang Wook Kang

摘要

To address the safety and performance challenges of lithium-ion batteries, particularly the risk of thermal runaway and inefficient ion transport, we developed a hydroxyethyl cellulose (HEC)/nonwoven fabric (NWF) composite membrane with high mechanical strength and a vertically aligned porous structure. The membrane integrates the mechanical robustness of biodegradable HEC with the thermal and chemical stability of the NWF substrate. Vertically aligned pores were formed via ethanol-induced phase separation under vacuum, facilitating rapid ion transport. Mercury porosimetry analysis confirmed an increased porosity (69.6%) with a well-defined pore size distribution. The membrane demonstrated a high ethanol flux (2659 ± 88 L/m2·h), low Gurley value (26.0 ± 13.3 s/100 mL), an ultra-hydrophilic contact angle of 19.8 ± 6.2°, and enhanced ion exchange capacity (1.3 × 10−3 meq/g), demonstrating excellent permeation and wettability properties. Intermolecular interactions between HEC and NWF were supported by FT-IR. Thermogravimetric analysis further showed improved thermal stability after phase separation. These results suggest that the fabricated membrane holds promise as a highly porous and thermally stable separator exhibiting superior permeation and wettability, thereby enhancing the safety and ionic conductivity of lithium-ion batteries.