Lili Yang, Yi Liang, Puyi Lei, Min Zhong, Wenzhuo Shen, Jiali Zhang and Shouwu Guo*,
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引用次数: 0
摘要
聚环氧乙烷(PEO)基固态电解质(ssi)因其独特的柔韧性、对电极的表面亲和性和易于加工而备受关注。然而,较差的离子电导率和机械强度阻碍了它们的实际应用。在这项工作中,我们将氧化铋甲酸酯(BiOCOOH)纳米线与聚偏氟乙烯-六氟丙烯(PVDF-HFP)纤维和含peo的双(三氟甲烷磺酰)亚胺(LiTFSI)通过同轴静电纺丝共混,然后热处理,制备了peo基sse。分散良好的BiOCOOH纳米线通过带正电荷的BiO+基团固定TFSI -,从而提高Li+的导电性。BiOCOOH纳米线的独特形态也降低了PEO的结晶度,提高了sce的离子电导率。PVDF-HFP光纤作为主机互连可以提供sse的机械强度。此外,这些纤维可以加速LiTFSI的解离。制备的电解质具有优异的离子电导率(1.56 × 10-4 S cm-1)和较高的Li+转移数(0.51)。使用该电解质制备的LiFePO4|| s||锂电池在25℃条件下经过600多次充放电循环后显示出较高的比容量。
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.