Al2O3 Fiber-Reinforced Polymer Solid Electrolyte Films with Excellent Lithium-Ion Transport Properties for High-Voltage Solid-State Lithium Batteries AITranslate

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DOI：https://doi.org/10.1021/acsapm.2c01034

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Composite solid electrolytes (CSEs) with high ionic conductivity and good interfacial compatibility are the basis for the practical application of solid-state lithium batteries. The combination of suitable polymers and inorganic fillers is the key to the preparation of CSEs with excellent performance. In this work, a flexible-rigid composite solid electrolyte film was prepared by incorporating different weight ratios (5–20 wt %) of γ-Al2O3 fibers into flexible polypropylene oxide (PPO) polymer electrolytes. Due to the addition of γ-Al2O3 fibers, the ion migration path is shortened and the ion migration rate is effectively improved. At the same time, the Lewis acid groups of γ-Al2O3 fibers react with TFSI– to release more Li+, which increases the number of lithium-ion migration. Therefore, when the content of γ-Al2O3 fibers is 15 wt %, the room-temperature ionic conductivity reaches 3.38 × 10–4 S cm–1, the ion migration number is 0.70, and the electrochemical window is 5.6 V. In addition, lithiophilic γ-Al2O3 reacts with Li metal to generate a Li–Al–O transition layer, which promotes Li+ interfacial transport and Li uniform deposition, and further inhibits the growth of Li dendrites. This Al2O3 fiber-reinforced CSE improves the lithium-ion transport properties and interface stability between lithium and the electrolyte and has positive practical applications in solid-state lithium batteries.