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Bio-inspired Spider-Web-Like Membranes with Hierarchical Structure for High Performance Lithium/Sodium Ion Battery Electrodes: The case of 3D Freestanding and binder-free Bismuth/CNFs Anodes

Abstract

High gravimetric energy density and volumetric energy density energy storage devices are highly desirable due to the rapid development of electric vehicles, portal and wearable electronic equipment. The electrospinning is a promising technology for preparing freestanding electrodes with high gravimetric and volumetric energy density. However, the energy density of the traditional electrospun electrodes is restricted by the low mass loading of active materials (e.g. 20% ~ 30 wt. %). Herein, a biomimetic strategy inspired by the phenomenon of the sticky spider's web is demonstrated as high performance anode, which simultaneously improves gravimetric and volumetric energy density. The freestanding carbon nanofibers (CNFs) membranes containing over 50 wt. % of bismuth were prepared by electrospinning and subsequently thermal treatment. Membranes consisting of CNFs network structures bonded tightly with the active Bi clusters materials, resulting in an excellent mechanical protection and a fast charge transport path, which are difficult to achieve simultaneously. The composite membrane deliver reversible capacity (483 mA h g-1 at 100 mA g-1 after 200 cycles) and high rate performance (242 mAh g-1 at 1 A g-1) as lithium-ion battery anode. For use as sodium ion battery, the composite membrane also show a high reversible specific capacity of 346 mA h g-1 and outstanding cycling performance (186 mA h g-1 at 50 mA g-1 after 100 cycles). This work offers a simple, low cost and eco-friendly method for fabricating free-standing and binder-free composite electrodes with high loading used in LIBs and SIBs.

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Publication details

The article was received on 07 Jul 2017, accepted on 09 Aug 2017 and first published on 10 Aug 2017


Article type: Paper
DOI: 10.1039/C7NR04912A
Citation: Nanoscale, 2017, Accepted Manuscript
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    Bio-inspired Spider-Web-Like Membranes with Hierarchical Structure for High Performance Lithium/Sodium Ion Battery Electrodes: The case of 3D Freestanding and binder-free Bismuth/CNFs Anodes

    Y. Jin, H. Yuan, J. Lan, Y. Yu, Y. Lin and X. Yang, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR04912A

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