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High-Performance Solid Polymer Electrolyte Constructed from Long-Chain Regulated Random Copolymers and Porous PI Composites.

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Title: High-Performance Solid Polymer Electrolyte Constructed from Long-Chain Regulated Random Copolymers and Porous PI Composites.
Authors: Zhang, Qian1,2 (AUTHOR), Cao, Mingyang1,2 (AUTHOR), Tang, Chenxia1,3 (AUTHOR), Zhou, Yuqing1 (AUTHOR), Peng, Xiaoli1,2,3 (AUTHOR) pxl@uestc.edu.cn
Source: Polymers (20734360). Mar2026, Vol. 18 Issue 6, p685. 17p.
Subjects: Ionic conductivity, Random copolymers, Tensile strength, Electrolytes, Polymer structure, Lithium-ion batteries, Polymeric composites
Abstract: Solid polymer electrolytes (SPEs) hold great potential in high-safety energy storage but face two key bottlenecks: low room-temperature ionic conductivity and insufficient mechanical strength. This study proposes a synergistic optimization strategy of "long-carbon-chain regulation of polymer microstructure combined with porous polyimide (PI) support". A linear random copolyester, poly(1,3-propylene-co-1,4-butylene succinate-co-sebacate) (PBPSS), was synthesized via melt polycondensation using 1,3-propanediol, 1,4-butanediol, succinic acid, and sebacic acid as monomers. Subsequently, the PBPSS-75 composite electrolyte was prepared with this copolyester as the matrix and porous PI as support. Results show that long-carbon-chain sebacic acid effectively regulates polymer segment flexibility and free volume, synergistically enhancing ionic conductivity and interfacial mechanical stability with lithium metal. Experimental data indicate that PBPSS-75 composite electrolyte exhibits an ionic conductivity of up to 4.25 × 10−5 S cm−1 (30 °C), a lithium-ion transference number of 0.81, and an electrochemical stability window of 4.48 V (vs. Li/Li+). In LiFePO4//Li batteries, it maintains nearly 100% capacity retention after 300 cycles at 0.5 C, and achieves stable cycling for over 800 h in lithium symmetric cells. This study confirms that the combined strategy effectively addresses the conductivity-mechanical property trade-off of SPEs, providing theoretical guidance and technical reference for high-performance solid-state battery material design. [ABSTRACT FROM AUTHOR]
Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
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  Data: High-Performance Solid Polymer Electrolyte Constructed from Long-Chain Regulated Random Copolymers and Porous PI Composites.
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  Data: <searchLink fieldCode="AR" term="%22Zhang%2C+Qian%22">Zhang, Qian</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cao%2C+Mingyang%22">Cao, Mingyang</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tang%2C+Chenxia%22">Tang, Chenxia</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhou%2C+Yuqing%22">Zhou, Yuqing</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Peng%2C+Xiaoli%22">Peng, Xiaoli</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<i> pxl@uestc.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Polymers+%2820734360%29%22">Polymers (20734360)</searchLink>. Mar2026, Vol. 18 Issue 6, p685. 17p.
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  Data: <searchLink fieldCode="DE" term="%22Ionic+conductivity%22">Ionic conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Random+copolymers%22">Random copolymers</searchLink><br /><searchLink fieldCode="DE" term="%22Tensile+strength%22">Tensile strength</searchLink><br /><searchLink fieldCode="DE" term="%22Electrolytes%22">Electrolytes</searchLink><br /><searchLink fieldCode="DE" term="%22Polymer+structure%22">Polymer structure</searchLink><br /><searchLink fieldCode="DE" term="%22Lithium-ion+batteries%22">Lithium-ion batteries</searchLink><br /><searchLink fieldCode="DE" term="%22Polymeric+composites%22">Polymeric composites</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Solid polymer electrolytes (SPEs) hold great potential in high-safety energy storage but face two key bottlenecks: low room-temperature ionic conductivity and insufficient mechanical strength. This study proposes a synergistic optimization strategy of "long-carbon-chain regulation of polymer microstructure combined with porous polyimide (PI) support". A linear random copolyester, poly(1,3-propylene-co-1,4-butylene succinate-co-sebacate) (PBPSS), was synthesized via melt polycondensation using 1,3-propanediol, 1,4-butanediol, succinic acid, and sebacic acid as monomers. Subsequently, the PBPSS-75 composite electrolyte was prepared with this copolyester as the matrix and porous PI as support. Results show that long-carbon-chain sebacic acid effectively regulates polymer segment flexibility and free volume, synergistically enhancing ionic conductivity and interfacial mechanical stability with lithium metal. Experimental data indicate that PBPSS-75 composite electrolyte exhibits an ionic conductivity of up to 4.25 × 10−5 S cm−1 (30 °C), a lithium-ion transference number of 0.81, and an electrochemical stability window of 4.48 V (vs. Li/Li+). In LiFePO4//Li batteries, it maintains nearly 100% capacity retention after 300 cycles at 0.5 C, and achieves stable cycling for over 800 h in lithium symmetric cells. This study confirms that the combined strategy effectively addresses the conductivity-mechanical property trade-off of SPEs, providing theoretical guidance and technical reference for high-performance solid-state battery material design. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/polym18060685
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      – Code: eng
        Text: English
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        PageCount: 17
        StartPage: 685
    Subjects:
      – SubjectFull: Ionic conductivity
        Type: general
      – SubjectFull: Random copolymers
        Type: general
      – SubjectFull: Tensile strength
        Type: general
      – SubjectFull: Electrolytes
        Type: general
      – SubjectFull: Polymer structure
        Type: general
      – SubjectFull: Lithium-ion batteries
        Type: general
      – SubjectFull: Polymeric composites
        Type: general
    Titles:
      – TitleFull: High-Performance Solid Polymer Electrolyte Constructed from Long-Chain Regulated Random Copolymers and Porous PI Composites.
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          Name:
            NameFull: Zhang, Qian
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            NameFull: Cao, Mingyang
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            NameFull: Tang, Chenxia
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            NameFull: Zhou, Yuqing
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            NameFull: Peng, Xiaoli
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              M: 03
              Text: Mar2026
              Type: published
              Y: 2026
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