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High Precision Coulometry of Commercial PAN-Based Carbon Fibers as Electrodes in Structural Batteries
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.ORCID iD: 0000-0002-2029-4945
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry. Swerea KIMAB AB, Sweden.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.ORCID iD: 0000-0001-9203-9313
2016 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 163, no 8, A1790-A1797 p.Article in journal (Refereed) Published
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Abstract [en]

Carbon fibers have the combined mechanical and electrochemical properties needed to make them particularly well suited for usage as electrodes in a structural lithium-ion battery, a material that simultaneously works as a battery and a structural composite. Presented in this paper is an evaluation of commercial polyacrylonitrile-based carbon fibers in terms of capacity and coulombic efficiency, as well as a microstructural and surface evaluation. Some polyacrylonitrile based carbon fibers intercalate lithium ions, resulting in a similar capacity as state-of-the-art graphite based electrodes, presently the most commonly used negative electrode material. Using high precision coulometry, we found a capacity of around 250-350 mAh/g and a very high coulombic efficiency of over 99.9% after ten cycles, which is even higher than a commercial state-of-the art graphitic electrode evaluated as reference. The high coulombic efficiency is attributed to the very low surface area of the carbon fibers, resulting in a small and stable solid-electrolyte interface layer. A highly graphitized ultra high modulus carbon fiber was evaluated as well and, compared to the other fibers, less lithium was inserted (corresponding to approximately 150 mAh/g). We show that the use of carbon fibers as an electrode material in a structural composite battery is indeed viable.

Place, publisher, year, edition, pages
2016. Vol. 163, no 8, A1790-A1797 p.
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-190528DOI: 10.1149/2.0041609jesISI: 000379688000041Scopus ID: 2-s2.0-84978063168OAI: oai:DiVA.org:kth-190528DiVA: diva2:952999
Funder
Swedish Energy Agency, 37712-1
Note

QC 20160816

Available from: 2016-08-16 Created: 2016-08-12 Last updated: 2016-08-16Bibliographically approved

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