Co-solvent induced piezoelectric γ-phase nylon-11 separator for sodium metal battery

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Title
Co-solvent induced piezoelectric γ-phase nylon-11 separator for sodium metal battery
Author
TNguyen Dien Kha TuPark, JaehyunNa, SangyunKim, Kwang MinKwon, Tae-HyukKo, HyunhyubKang, Seok Ju
Issue Date
2020-04
Publisher
Elsevier BV
Citation
NANO ENERGY, v.70, pp.104501
Abstract
Nylon-11, the most studied member of the odd-numbered nylon family, is a promising functional material for future electronic devices or energy storage systems. To utilize nylon-11 in those applications, it is necessary to control the formation of the applicable metastable crystal phases such as the piezoelectric γ-phase or ferroelectric δ′-phase. Herein, we describe a facile method of fabricating metastable γ-phase nylon-11 fibers via electrospinning with a tailored solvent system. By using a solvent mixture of 1,1,1,3,3,3-hexafluoro-2-propanol and trifluoroacetic acid [HFIP:TFA (75:25 mol%)], we could fully eliminate the formation of the most stable α-phase and create metastable γ-phase nylon-11 fibers. The electrospun γ-phase nylon-11 fibrous membrane displayed a typical piezoelectric response when it experienced a periodic external force. Furthermore, the γ-phase nylon-11 fibrous membrane exhibited higher thermal stability, electrolyte wettability, and ionic conductivity than the conventional Celgard separator. Consequently, it achieved decent performance when applied as a separator in a sodium metal half-cell. This study indicates that piezoelectric γ-phase nylon-11 fibrous membranes have great potential for further development in energy harvesting and storage, especially as piezo-separators in self-charging power cells.
URI
https://scholarworks.unist.ac.kr/handle/201301/31114
URL
https://www.sciencedirect.com/science/article/pii/S2211285520300586
DOI
10.1016/j.nanoen.2020.104501
ISSN
2211-2855
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