Enhancing the properties of PEG-based solid polymer electrolytes with TiO2 nanoparticles for potassium ion batteries

IF 3.8 Q2 CHEMISTRY, PHYSICAL

Chemical Physics Impact Pub Date : 2024-11-24 DOI:10.1016/j.chphi.2024.100788

Anji Reddy Polu , Faisal Islam Chowdhury , Pramod K. Singh , Markus Diantoro , Firdaus Mohamad Hamzah

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Abstract

In this study, nanocomposite solid polymer electrolytes (NSPEs) based on poly(ethylene glycol) (PEG), potassium nitrate (KNO₃), and titanium oxide (TiO₂) nanoparticles were synthesized using a solution casting technique. The impact of various TiO₂ nanoparticle concentrations on the structural, thermal, electrical and electrochemical properties of the NSPEs was investigated. X-ray diffraction analysis revealed a decrease in the degree of crystallinity of the PEG–KNO₃ electrolyte upon the addition of TiO₂ nanoparticles. Differential scanning calorimetry measurements showed a decrease in the melting temperature of the NSPE with the incorporation of 6 wt.% TiO₂ nanoparticle concentration. The ionic conductivity of the NSPEs increased with TiO₂ concentration up to 6 wt.% (σ = 5.94 × 10⁻⁵ S/cm), beyond which a decrease was observed. Transference number measurements confirmed the dominance of ionic charge transport in the NSPE. A solid-state electrochemical cell fabricated using the optimal NSPE composition (80PEG–20KNO₃–6 wt.% TiO₂) exhibited promising discharge performance under a constant load of 100 kΩ.

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在钾离子电池中使用 TiO2 纳米粒子增强 PEG 基固体聚合物电解质的性能

本研究采用溶液浇铸技术合成了基于聚乙二醇（PEG）、硝酸钾（KNO3）和氧化钛（TiO2）纳米颗粒的纳米复合固体聚合物电解质（NSPEs）。研究了不同浓度的 TiO2 纳米粒子对 NSPE 的结构、热、电和电化学性能的影响。X 射线衍射分析表明，加入 TiO2 纳米粒子后，PEG-KNO3 电解质的结晶度降低。差示扫描量热法测量结果表明，加入 6 wt.% 浓度的 TiO2 纳米粒子后，NSPE 的熔化温度降低。NSPE 的离子电导率随着 TiO2 浓度的增加而增加，最高可达 6 wt.%（σ = 5.94 × 10-5 S/cm），超过 6 wt.%后离子电导率有所下降。转移数测量证实了离子电荷传输在 NSPE 中的主导地位。使用最佳 NSPE 成分（80PEG-20KNO3-6 wt.% TiO2）制造的固态电化学电池在 100 kΩ 的恒定负载下表现出良好的放电性能。

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