A bifunctional double-layer Fe3O4-Polyvinylidene fluoride(PVDF)/PVDF separator with enhanced thermal stability for Li-S batteries

Li-S batteries, utilizing sulfur as the active material, have garnered significant attention due to their impressive theoretical specific capacity of 1675 mA h g−1. However, the commercialization of these batteries faces challenges primarily stemming from the volume expansion of sulfur and the shutt...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Vol. 694; p. 133970
Main Authors: Ma, Chaoyong, Su, Jianhui, Zhang, Yanying, Guo, Qianli, Li, Bingming, Wang, JingWen
Format: Journal Article
Language:English
Published: Elsevier B.V 05-08-2024
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Summary:Li-S batteries, utilizing sulfur as the active material, have garnered significant attention due to their impressive theoretical specific capacity of 1675 mA h g−1. However, the commercialization of these batteries faces challenges primarily stemming from the volume expansion of sulfur and the shuttling effect caused by soluble polysulfides. In this study, we present a novel solution through the development of a bifunctional double-layer Fe3O4-PVDF/PVDF separator via electrospinning. The mesh structure of PVDF facilitates rapid lithium ion transport and effectively accommodates the volume expansion of sulfur during discharge/charge, leveraging its high thermal stability and mechanical properties. The incorporation of Fe3O4 within the PVDF matrix serves to trap polysulfides, mitigating the shuttle effect. Experimental results demonstrate that Li-S batteries employing the Fe3O4-PVDF/PVDF separator exhibit an initial discharge capacity of 1052.7 mA h g−1 at a current density of 0.5 C, with a commendably low capacity decay rate of 0.08 % per cycle after 250 cycles. This innovative separator design showcases promising advancements in addressing critical issues hindering the commercial viability of Li-S batteries. [Display omitted]
ISSN:0927-7757
1873-4359
DOI:10.1016/j.colsurfa.2024.133970