PEO 基固态电解质离子电导率的温度依赖性机制

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引用格式：，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（4）：771-775.

YANG Xin， DUAN Chunyang， LIN Yanying， et al. Temperature-Dependent Mechanism of Ionic Conductivity of PEO-Based Solid Electrolytes[J]. Contemporary Chemical Industry， 2026， 55（4）： 771-775.

中图分类号：TQ050.4+3

文献标志码：A

文章编号：1671-0460（2026）04-0771-05

Temperature-Dependent Mechanism of Ionic Conductivity of PEO-Based Solid Electrolytes

YANG Xin， DUAN Chunyang， LIN Yanying， MA Xingdao （Liaoning Petrochemical University， Fushun Liaoning 113001， China）

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 lithium-ion 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.

Keywords： Polyethylene oxide; Lithium-ion batteries; Solid electrolytes; Composite material

固态锂离子电池作为新一代储能技术，因其理论能量密度（可达 500，W⋅h⋅kg-1 以上）显著高于传统锂离子电池，且彻底规避液态电解质易燃、泄漏等安全隐患，成为高安全性、高能量密度电池体系的核心发展方向 [1-3] 。（剩余9231字）