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Multifunctional Performance of Sodiated Carbon Fibers
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Applied Electrochemistry.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Lightweight Structures.ORCID iD: 0000-0002-9744-4550
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Applied Electrochemistry.ORCID iD: 0000-0001-9203-9313
2018 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 165, no 13, p. B616-B622Article in journal (Refereed) Published
Abstract [en]

An investigation is conducted into the potential for sodiated PAN-based carbon fibers (CFs) to be used in multifunctional actuation, sensing, and energy harvesting. Axial CF expansion/contraction is measured during sodiation/desodiation using operando strain measurements. The reversible expansion/contraction is found to be 0.1% - which is lower than that of lithiated CFs. The axial sodiation expansion occurs in two well-defined stages, corresponding to the sloping and plateau regions of the galvanostatic cycling curve. The results indicate that the sloping region most likely corresponds to sodium insertion between graphitic sheets, while the plateau region corresponds to sodium insertion in micropores. A voltage-strain coupling is found for the CFs, with a maximum coupling factor of 0.15 +/- 0.01 V/unit strain, which could be used for strain sensing in multifunctional structures. This voltage-strain coupling is too small to be exploited for harvesting mechanical energy. The measured axial expansion is further used to estimate the capacity loss due to solid electrolyte interphase (SEI) formation, as well as capacity loss due to sodium trapped in the CF microstructure. The outcomes of this research suggest that sodiated CFs show some potential for use as actuators and sensors in future multifunctional structures, but that lithiated CFs show more promise.

Place, publisher, year, edition, pages
ELECTROCHEMICAL SOC INC , 2018. Vol. 165, no 13, p. B616-B622
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-238125DOI: 10.1149/2.0971813jesISI: 000447133000001OAI: oai:DiVA.org:kth-238125DiVA, id: diva2:1263061
Conference
Meeting of the Society, MAY 13-17, 2018, Seattle, WA
Funder
Swedish Energy Agency, 37712-1Swedish Research Council, 2017-03898 ; 621-2014-4577Swedish Research Council Formas, 2016-20058 ; 2016-01520VINNOVA
Note

QC 20181114

Available from: 2018-11-14 Created: 2018-11-14 Last updated: 2018-12-17Bibliographically approved

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Harnden, RossPeuvot, KevinZenkert, DanLindbergh, Göran

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