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Solution Blowing Synthesis of Li-Conductive Ceramic Nanofibers

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posted on 27.03.2020, 18:04 authored by Zhennan Huang, Alexander Kolbasov, Yifei Yuan, Meng Cheng, Yunjie Xu, Ramin Rojaee, Ramasubramonian Deivanayagam, Tara Foroozan, Yuzi Liu, Khalil Amine, Jun Lu, Alexander L. Yarin, Reza Shahbazian-Yassar
Solid state electrolytes (SSEs) offer great potential to enable high-performance and safe lithium (Li) batteries. However, the scale-up synthesis and processing of SSEs is a major challenge. In this work, three-dimensional networks of lithium lanthanum titanite (LLTO) nanofibers are produced through a scale-up technique based on solution blowing. Compared with the conventional electrospinning method, the solution blowing technique enables high-speed fabrication of SSEs (e.g., 15 times faster) with superior productivity and quality. Additionally, the room-temperature ionic conductivity of composite polymer electrolytes (CPEs) formed from solution-blown LLTO fibers is 70% higher than the ones formed from electrospun fibers (1.9 × 10 –4 vs 1.1 × 10–4 S cm–1 for 10 wt % LLTO fibers). Furthermore, the cyclability of the CPEs made from solution-blown fibers in the symmetric Li cell is more than 2.5 times that of the CPEs made from electrospun fibers. These comparisons show that solution-blown ion-conductive fibers hold great promise for applications in Li metal batteries.