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High-performance composite solid electrolyte with elevated ionic liquid and high-dielectric high-entropy oxide in poly(vinylidene fluoride-co-hexafluoropropylene) for advanced lithium-ion batteries
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High-performance composite solid electrolyte with elevated ionic liquid and high-dielectric high-entropy oxide in poly(vinylidene fluoride-co-hexafluoropropylene) for advanced lithium-ion batteries

W.-H. Lu, Y.-S. Huang, Y.-L. Chen, Y.-H. Tseng, J.-H. Pan, Y.-Y. Li, Y.-D. Luo, C.-H. Kuo, C.-P. Tan, R.-A. Doong, …
Chemical Engineering Journal, 卷.532
2026
DOI: https://doi.org/10.1016/j.cej.2026.174042
Web of Science ID: WOS:001706033800001

摘要

Composite solid electrolyte High dielectric electrolyte High entropy oxide Lithium-ion batteries PVDF-HFP Pyr<sub>14</sub>TFSI Aluminum compounds Anodes Binary alloys Cobalt compounds Dielectric materials Electric discharges Entropy Fluorine compounds Ionic conduction in solids Ionic conductivity Ionic liquids Ions Lithium Fluoride Phosphorus compounds Solid electrolytes Solid-State Batteries Tantalum compounds Tin compounds Titanium compounds Composite solid electrolytes High dielectric electrolyte High dielectrics High entropy oxide Ion batteries Lithium ions Poly(vinylidene fluoride-co-hexafluoropropylene) Pyr14TFSI Solid state lithium ion battery Lithium-ion batteries
Composite solid electrolytes (CSEs) offer a promising approach for solid-state lithium-ion batteries (LIBs), integrating polymers, ionic liquids, and ceramics to attain high thermal stability, fast ionic conduction, and low interfacial resistance. In this study, we developed a novel CSE using a high-dielectric high-entropy oxide, Li1.3Al0.4Ti0.5Zr0.5Sn0.5Ta0.1(PO4)3 (LATZSTP), with poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), and 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide (Pyr14TFSI). The CSE—incorporated with up to 20 wt% LATZSTP—achieved a high ionic conductivity of 6.79 (±0.04) × 10−4 S cm−1 and demonstrated high electrochemical stability through Li stripping and plating tests. When the CSE of 40 wt% in a solid-state LIB with a lithium metal anode and LiFePO4 cathode (denoted as Li/CSE/LiFePO4), the CSE enabled an initial discharge capacity of 158 mA h g−1, retaining 80.97% of this capacity after 400 cycles. These findings highlight this CSE for high-performance and safe solid-state LIBs. © 2026

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