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<p>In this work, a two-dimensional graphene nanoplatelet (GNP) -incorporated polymer blend of polyethylene oxide (PEO) and polylactic acid (PLA), employing their advantageous characteristics in quasi-solid-state gel polymer electrolytes (GPEs), which demonstrate a high ionic conductivity for the superior electrochemical performance of lithium metal batteries (LiMBs), is presented. Lithium perchlorate (LiClO<sub>4</sub>) salt and different wt% of GNP have been incorporated to optimize and enhance the electrochemical properties of the GPEs. The effects of LiClO<sub>4</sub> and GNP on the morphology, thermal properties, and crystallization of GPEs have been analyzed thoroughly. The electrochemical impedance spectroscopy has revealed that the GPE with 2 wt% GNP exhibits the highest ionic conductivity of 8.0 × 10<sup>− 4</sup> S/cm with a relative crystallinity of 70.1%, which confirms that adding GNP decreases the resistance and increases the crystallinity of the GPEs to an optimal level for the superior charge storage capacity. Besides, the galvanostatic charge-discharge study has indicated the GPE with 2 wt% GNP achieved a lithiation capacity of 479 mAhg<sup>− 1</sup>, with an initial coulombic efficiency of 59.3%, and attained 76.3% of the theoretical capacity of graphite (372 mAhg<sup>− 1</sup>).</p>

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Two-dimensional graphene nanoplatelets incorporated PEO/PLA polymer mixture for the enhanced electrochemical performance of quasi-solid polymer electrolytes

  • 期刊论文

  • 发表日期：

    2025年11月8日

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  • Ankan Gobinda Choudhury,
  • Gayathri Viswanathan,
  • Elamathy Balamoorthy,
  • Geetha Nagarajan,
  • Duraisamy Kumaresan,
  • Thirugnasambandam G. Manivasagam

摘要

In this work, a two-dimensional graphene nanoplatelet (GNP) -incorporated polymer blend of polyethylene oxide (PEO) and polylactic acid (PLA), employing their advantageous characteristics in quasi-solid-state gel polymer electrolytes (GPEs), which demonstrate a high ionic conductivity for the superior electrochemical performance of lithium metal batteries (LiMBs), is presented. Lithium perchlorate (LiClO4) salt and different wt% of GNP have been incorporated to optimize and enhance the electrochemical properties of the GPEs. The effects of LiClO4 and GNP on the morphology, thermal properties, and crystallization of GPEs have been analyzed thoroughly. The electrochemical impedance spectroscopy has revealed that the GPE with 2 wt% GNP exhibits the highest ionic conductivity of 8.0 × 10− 4 S/cm with a relative crystallinity of 70.1%, which confirms that adding GNP decreases the resistance and increases the crystallinity of the GPEs to an optimal level for the superior charge storage capacity. Besides, the galvanostatic charge-discharge study has indicated the GPE with 2 wt% GNP achieved a lithiation capacity of 479 mAhg− 1, with an initial coulombic efficiency of 59.3%, and attained 76.3% of the theoretical capacity of graphite (372 mAhg− 1).