Polymer Template Synthesis of Flexible SiO₂ Nanofibers to Upgrade Composite Electrolytes
2020
Liu, Shujie | Shan, Haoru | Xia, Shuhui | Yan, Jianhua | Yu, Jianyong | Ding, Bin
Flexible oxide ceramic films offer prospects for revolutionizing diverse fields such as energy and electronics, but their fabrication methods are typically elaborate and cannot be expanded. Here, we report a scalable strategy to fabricate flexible and robust SiO₂ nanofiber films with controllable morphology using a sol–gel electrospinning method followed by low-temperature calcination. When applied to composite polymer electrolytes (CPEs) for solid-state batteries by filling polyethylene oxide into porous ceramic films, SiO₂ nanofibers with large surface areas (51 m²·g–¹) demonstrate strong Lewis interfacial interactions and isotropic ionic transfer channels that mitigate polymer crystallinity and Li⁺-concentration polarization, imparting high conductivity (1.3 × 10–⁴ S·cm–¹ at 30 °C) and structural stability to the electrolytes. As a result, all-solid-state LiFePO₄||Li shows great rate capability and long cycling stability with high discharge capacities of 159 and 132 mA·h·g–¹ at 0.5C under 60 and 45 °C, respectively, demonstrating broad commercial prospects for the scale production of efficient solid electrolytes.
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