Lili Yang, Yi Liang, Puyi Lei, Min Zhong, Wenzhuo Shen, Jiali Zhang and Shouwu Guo*,
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引用次数: 0
Abstract
Poly(ethylene oxide) (PEO)-based solid-state electrolytes (SSEs) have attracted significant attention owing to their unique flexibility, great surface affinity to electrodes, and ease of processing. Nevertheless, the poor ionic conductivity and mechanical strength hinder their practical applications. In this work, we prepared PEO-based SSEs by blending bismuth oxide formate (BiOCOOH) nanowires with poly(vinylidene fluoride)-hexafluoropropylene (PVDF-HFP) fibers and PEO-containing lithium bis (trifluoromethane sulfonyl) imide (LiTFSI) through coaxial electrospinning, followed by heat treatment. The well-dispersed BiOCOOH nanowires immobilize TFSI– through positively charged BiO+ groups, thereby improving Li+ conductivity. The unique morphology of BiOCOOH nanowires also reduces the degree of crystallinity in the PEO, boosting the ionic conductivity of the SSEs. The interconnected PVDF-HFP fibers as hosts can provide the mechanical strength of the SSEs. Moreover, these fibers can accelerate the dissociation of LiTFSI. The as-fabricated electrolyte shows an excellent ionic conductivity (1.56 × 10–4 S cm–1) and a high Li+ transference number (0.51). The LiFePO4||SSEs||Li cells with the as-prepared electrolyte exhibit high specific capacity after more than 600 charge/discharging cycles at 25 °C.
期刊介绍:
ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.