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<p>In this work, the gravure printing method is regarded as a promising technique for the production of novel thin lithium-ion battery (LIB) separators based on poly(butylene adipate-<i>co</i>-terephthalate)/polylactic acid (CE-PBAT/PLA) with high flexibility and processability. CE-PBAT is used as the primary polymeric matrix, while PLA is incorporated to tune porosity, wettability, and microstructure for the LIB separators. The applied preparation technique based on the wet method using dioctyl phthalate formed a nanoporous separator with well-dispersed cavities smaller than 70&#xa0;nm, a porosity of <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:\sim\)</EquationSource> </InlineEquation>43%, and a cavity number density of 16–17&#xa0;μm<sup>−2</sup>. When PLA was introduced into the CE-PBAT matrix at 50 <i>wt</i>%, the overall porosity decreased by 18% while the cavity size increased by 86%. However, beyond the CE-PBAT/PLA ratio of 1:1, phase separation between the polymers became pronounced, leading to a 66% decrease in porosity. The presence of PLA in the formulation enhanced both surface (quantified by contact angle-time measurements) and bulk wettability (quantified by electrolyte absorption) by 34% and 11%, respectively. Among all formulations, the membrane containing 50 <i>wt</i>% CE-PBAT exhibited a balanced combination of morphology, wettability, and ionic performance. The ionic conductivity achieved for the LIB assembled with the optimum separator was 2.31 mS/cm, representing a 43% increase compared to PLA-based membranes. Future studies may focus on evaluating the thermal and dimensional stability, long-term cycling performance, scalability of the gravure printing process, and biodegradability of the optimum separator.</p>

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Nanoporous Membrane Made of Chain-Extended Poly(Butylene Adipate-co-Terephthalate)/Polylactic Acid as High-Performance Separator for Lithium-Ion Battery Using Gravure Printing Method

  • 期刊论文

  • 发表日期：

    2026年3月23日

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  • Maryam Arshadi,
  • Amirreza Zabihi,
  • Sajad Rasouli,
  • Maryam Ataeefard

摘要

In this work, the gravure printing method is regarded as a promising technique for the production of novel thin lithium-ion battery (LIB) separators based on poly(butylene adipate-co-terephthalate)/polylactic acid (CE-PBAT/PLA) with high flexibility and processability. CE-PBAT is used as the primary polymeric matrix, while PLA is incorporated to tune porosity, wettability, and microstructure for the LIB separators. The applied preparation technique based on the wet method using dioctyl phthalate formed a nanoporous separator with well-dispersed cavities smaller than 70 nm, a porosity of \(\:\sim\) 43%, and a cavity number density of 16–17 μm−2. When PLA was introduced into the CE-PBAT matrix at 50 wt%, the overall porosity decreased by 18% while the cavity size increased by 86%. However, beyond the CE-PBAT/PLA ratio of 1:1, phase separation between the polymers became pronounced, leading to a 66% decrease in porosity. The presence of PLA in the formulation enhanced both surface (quantified by contact angle-time measurements) and bulk wettability (quantified by electrolyte absorption) by 34% and 11%, respectively. Among all formulations, the membrane containing 50 wt% CE-PBAT exhibited a balanced combination of morphology, wettability, and ionic performance. The ionic conductivity achieved for the LIB assembled with the optimum separator was 2.31 mS/cm, representing a 43% increase compared to PLA-based membranes. Future studies may focus on evaluating the thermal and dimensional stability, long-term cycling performance, scalability of the gravure printing process, and biodegradability of the optimum separator.