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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Carboxylated polyimide separator with excellent lithium ion transport properties for a high-power density lithium-ion battery
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Carboxylated polyimide separator with excellent lithium ion transport properties for a high-power density lithium-ion battery

机译：具有优异的高功率密度锂离子电池的优异锂离子传输性能的羧基化的聚酰亚胺分离器

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摘要

The improvement of lithium ion transport properties, along with the ever-increasing demand for highpower density, is key to boosting the development of lithium-ion batteries. Here, we present a new class of carboxylated polyimide (PI) separator, which can be fabricated via an alkali treatment-based surface modification. The -COOH groups with unshared electron pairs were proposed to contribute to the desolvation of lithium ions and an increase in the lithium ion transport rate. Notably, the modification did not destroy the microstructure of the PI separator, and thus the effect of -COOH groups on the lithium ion transport properties was clearly demonstrated in this work. The result showed that the carboxylated PI separator was conducive to improving the lithium ion transference number (up to 0.87), which is four times higher than that for the original PI separator. More importantly, for the first time, the -COOH group was calculated to increase the lithium ion transport rate by more than six times. Benefiting from its high lithium ion transference number and slightly increased ionic conductivity, the cell assembled with the carboxylated PI separator achieved a better cycle performance and higher rate capability than that with the original PI separator.
机译：锂离子传输性能的改善以及对高功率密度的不断增长的需求，是提高锂离子电池的开发的关键。这里，我们介绍了一类新的羧化聚酰亚胺（PI）隔膜，其可以通过基于碱处理的表面改性来制造。提出了具有未共享电子对的-COOH基团，以有助于锂离子的脱溶解和锂离子传输速率的增加。值得注意的是，修饰没有破坏PI分离器的微观结构，因此在这项工作中清楚地证明了-COOH基团对锂离子传输性质的影响。结果表明，羧化的PI分离器有利于改善锂离子转移数（高达0.87），其比原始PI分离器高4倍。更重要的是，首次计算-COOH基团以使锂离子传输速率增加超过六次。受益于其高锂离子转移数和略微增加的离子电导率，与羧化PI分离器组装的电池达到了比用原始PI分离器更好的循环性能和更高的速率能力。

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  • 作者

    Lin Chun-Er; Zhang Hong; Song You-Zhi; Zhang Yin; Yuan Jia-Jia; Zhu Bao-Ku;

  • 作者单位

    Zhejiang Univ Dept Polymer Sci &

    Engn Key Lab Macromol Synth &

    Functionalizat MOE ERC Membrane &

    Water Treatment MOE Hangzhou 310027 Zhejiang Peoples R China;

    Sun Yat Sen Univ Minist Educ Key Lab High Performance Polymer Based Composites Key Lab Polymer Composite &

    Funct Mat Guangzhou 510275 Guangdong Peoples R China;

    Zhejiang Univ Dept Polymer Sci &

    Engn Key Lab Macromol Synth &

    Functionalizat MOE ERC Membrane &

    Water Treatment MOE Hangzhou 310027 Zhejiang Peoples R China;

    Zhejiang Univ Dept Polymer Sci &

    Engn Key Lab Macromol Synth &

    Functionalizat MOE ERC Membrane &

    Water Treatment MOE Hangzhou 310027 Zhejiang Peoples R China;

    Zhejiang Univ Dept Polymer Sci &

    Engn Key Lab Macromol Synth &

    Functionalizat MOE ERC Membrane &

    Water Treatment MOE Hangzhou 310027 Zhejiang Peoples R China;

    Zhejiang Univ Dept Polymer Sci &

    Engn Key Lab Macromol Synth &

    Functionalizat MOE ERC Membrane &

    Water Treatment MOE Hangzhou 310027 Zhejiang Peoples R China;

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  • 正文语种 eng
  • 中图分类 工程材料学;
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