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PEO基固态电解质因其良好的锂盐解离能力和柔韧性成为固态锂离子电池领域的研究热点，但其结晶度高导致的低室温离子电导率和锂离子迁移数是制约其应用的关键瓶颈。系统研究了PEO相对分子质量、温度及纳米颗粒改性对PEO离子电导率的影响规律。结果表明：30万相对分子质量PEO因链段运动活性高，其室温离子电导率及锂离子迁移数显著优于60万相对分子质量PEO的对应值，但后者在高温情况下具有更强的锂离子传输能力和离子电导率。通过将SiO2纳米颗粒引入到PEO固态电解质中可以有效抑制其结晶，并增强界面离子输运，使室温电导率提高至9.75×10-6 S·cm-1。
Abstract：PEO-based solid-state electrolytes have become a research hotspot in the field of solid-state lithium-ion batteries due to their good lithium salt dissociation ability and flexibility, but their low room temperature ionic conductivity and lithium-ion mobility number due to their high crystallinity are the key bottlenecks restricting their application. The effects of PEO relative molecular mass, temperature and nanoparticle modification on the conductivity of PEO ions were systematically studied. The results showed that the ionic conductivity and lithium-ion mobility number of PEO with 300 000 relative molecular mass at room temperature were significantly better than those of PEO with 600 000 relative molecular mass due to the high activity of the segment movement, but the latter had stronger lithiumion transport capacity and ionic conductivity at high temperatures. The introduction of SiO2 nanoparticles into the PEO solid electrolyte could effectively inhibit its crystallization and enhance the interfacial ion transport, increasing the conductivity to 9.75×10-6S·cm-1 at room temperature.
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基本信息:
DOI：10.13840/j.cnki.cn21-1457/tq.2026.04.036
中图分类号:O646;TM912
引用信息:
[1]杨鑫,段春阳,林艳影,等.PEO基固态电解质离子电导率的温度依赖性机制[J].当代化工,2026,55(04):771-775.DOI:10.13840/j.cnki.cn21-1457/tq.2026.04.036.
基金信息:
国家自然科学基金面上项目（项目编号：52273075）; 辽宁石油化工大学人才引进项目（项目编号：1100011652）
2026-04-28
2026-04-28