Poly(ethylene oxide) (PEO)-based solid polymer electrolytes are pivotal in advancing high-energy-density solid-state battery technology, particularly for lithium-ion and other rechargeable batteries. PEO-based polymer electrolytes are regarded as promising due to their high conductivity and stability. However, conventional linear PEO exhibits limited ionic conductivity, attributed to the high crystallinity of the ethylene oxide (EO) chains. This crystallinity impedes ion migration, particularly at low temperatures. Various strategies have been employed to reduce the crystallinity of PEO to enhance the ionic conductivity of PEO-based electrolytes. Moreover, the electrochemical window and compatibility with both electrodes are critical. Scientists have investigated diverse approaches to enhance interfacial performance with electrodes for better electrochemical stability. This Review summarizes the latest research advancements in PEO-based solid polymer electrolytes for lithium-ion batteries, emphasizing enhancements in ionic transport properties, mechanical performance, electrochemical stability, structural design optimization, and the exploration of new PEO-based electrolyte systems. Finally, the challenges and future prospects of these materials are discussed.

中文翻译：

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锂离子电池用聚环氧乙烷基固态电解质的研究进展


基于聚环氧乙烷 （PEO） 的固体聚合物电解质在推进高能量密度固态电池技术方面发挥着关键作用，特别是对于锂离子和其他可充电电池。基于 PEO 的聚合物电解质因其高导电性和稳定性而被认为很有前途。然而，由于环氧乙烷 （EO） 链的高结晶度，传统的线性 PEO 表现出有限的离子电导率。这种结晶度会阻碍离子迁移，尤其是在低温下。已经采用了各种策略来降低 PEO 的结晶度，以提高基于 PEO 的电解质的离子电导率。此外，电化学窗口和与两种电极的兼容性至关重要。科学家们已经研究了多种方法，以增强电极的界面性能，以获得更好的电化学稳定性。本文总结了锂离子电池用 PEO 基固体聚合物电解质的最新研究进展，强调了离子传输性能、机械性能、电化学稳定性、结构设计优化方面的增强，以及对基于 PEO 的新型电解质系统的探索。最后，讨论了这些材料面临的挑战和未来前景。