1.西南交通大学,化学学院,四川 成都 610031
2.西南交通大学,材料先进技术教育部重点
3.实验室,材料科学与工程学院,四川 成都 610031,西南交通大学,前沿科学研究院,四川;;成都 610031);图片摘要
网络首发:2026-06-03,
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郑肖杰, 俞尚长, 何奇霖, 等. 聚环氧乙烷基电解质结构设计与离子传输机制研究进展[J/OL]. 储能科学与技术, 2026,1-22.
ZHENG Xiaojie, YU Shangchang, HE Qinlin, et al. Progress in Structural Design and Ion Transport Mechanisms of PEO-Based Electrolytes[J/OL]. Energy Storage Science and Technology, 2026, 1-22.
郑肖杰, 俞尚长, 何奇霖, 等. 聚环氧乙烷基电解质结构设计与离子传输机制研究进展[J/OL]. 储能科学与技术, 2026,1-22. DOI: 10.19799/j.cnki.2095-4239.2026.0372.
ZHENG Xiaojie, YU Shangchang, HE Qinlin, et al. Progress in Structural Design and Ion Transport Mechanisms of PEO-Based Electrolytes[J/OL]. Energy Storage Science and Technology, 2026, 1-22. DOI: 10.19799/j.cnki.2095-4239.2026.0372.
针对聚环氧乙烷(PEO)基固态电解质中离子电导率、机械强度与界面稳定性难以兼顾的核心瓶颈及其突破策略,本文从聚合物本体结构设计出发,介绍了四种改性方法:深共晶溶剂原位增塑,通过与PEO链段竞争配位Li
+
,弱化Li
+
与醚氧相互作用,提升离子电导率与锂离子迁移数;离子液体封装于交联网络,构建聚合物与离子液体双重传导路径,增强界面稳定性;硫醇-烯点击化学构建半互穿网络,引入短链增塑剂降低链段运动能垒,并采用双盐体系原位构筑富LiF界面层;热压层合制备锂化有机纳米纤维增强网络,利用氢键与界面快速传输通道协同提升离子电导率与力学性能。在复合电解质设计中,阐述了三种协同增强策略:金属有机框架中开放金属位点对TFSI
-
的强配位固定,促进锂盐解离并提高锂离子迁移数;热塑性聚氨酯与二维锂镁硅酸盐纳米片的复合,通过Lewis酸位点固定阴离子并抑制PEO结晶;Janus层调控LLZTO/PEO界面化学相容性,同时解决填料团聚、阴离子迁移及界面副反应。针对硅碳负极界面,提出了预浸润处理构建连续聚合物离子传导网络,显著提升活性材料利用率与循环稳定性。本研究系统揭示了PEO基电解质中离子传输的多尺度调控机制,为高比能全固态锂金属电池的理性设计提供了实验依据与理论支撑,并对复合聚合物电解质的产业化发展方向进行了展望。
Poly(ethylene oxide) (PEO)-based solid-state electrolytes face a long-standing trade-off among ionic conductivity
mechanical strength
and interfacial stability. This study summarizes recent progress in breaking this bottleneck through structural design and ion transport mech
anism modulation of PEO-based electrolytes. For polymer bulk structure design
we introduce four modification methods: (i) in situ formation of deep eutectic solvents weakens Li
+
-ether oxygen coordination via competitive binding
significantly increasing ionic conductivity and Li
+
ion transference number; (ii) encapsulation of ionic liquids in cross-linked networks constructs dual polymer and ionic liquid conduction pathways and enhances interfacial stability; (iii) thiol-ene click chemistry builds a semi-interpenetrating network with short-chain plasticizers to lower chain motion energy barriers
and a dual-salt system in situ forms a LiF-rich interface layer; (iv) thermal lamination produces lithiated organic nanofiber-reinforced composite electrolytes
where hydrogen bonding and interfacial fast-transport channels synergistically improve ionic conductivity and mechanical strength. Regarding composite electrolyte design
we elaborate three synergistic strategies: (i) exposed metal sites in metal-organic frameworks strongly anchor TFSI
-
promoting lithium salt dissociation and raising Li
+
ion transference number; (ii) thermoplastic polyurethane combined with two-dimensional lithium magnesium silicate nanosheets uses Lewis acid sites to fix anions and suppress PEO crystallization; (iii) a Janus layer regulates chemical compatibility at the LLZTO/PEO interface
resolving filler agglomeration
anion migration
and interfacial side reactions. To address the silicon-carbon anode interface
we propose a pre-infiltration treatment that builds a continuous polymer ion conduction network
markedly improving active material utilization and cycling stability. Collectively
these studies systematically reveal multi-scale ion transport regulation mechanisms in PEO-based electrolytes
providing experimental evidence and theoretical support for rational design of high-specific-energy all-solid-state lithium metal batteries. Finally
we prospect the industrial development direction of
composite polymer electrolytes.
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