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High precision coulometry of commercial PAN-based carbon fibers as electrodes in structural batteries
KTH Royal Institute of Technology, Sweden.
RISE, Swerea, KIMAB. KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
2016 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 163, no 8, p. A1790-A1797Article in journal (Refereed) Published
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, amaterial 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
Electrochemical Society Inc. , 2016. Vol. 163, no 8, p. A1790-A1797
Keywords [en]
Carbon fibers, Efficiency, Electric batteries, Electrodes, Electrolytes, Fibers, Graphite electrodes, Lithium, Lithium alloys, Lithium-ion batteries, Solid electrolytes, Coulombic efficiency, Negative electrode material, PAN based carbon fiber, Solid electrolyte interfaces, Structural batteries, Structural composites, Surface evaluations, Ultra-high modulus carbon fibers, Electrochemical electrodes
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-42173DOI: 10.1149/2.0041609jesScopus ID: 2-s2.0-84978063168OAI: oai:DiVA.org:ri-42173DiVA, id: diva2:1379460
Note

Funding details: 37712-1; Funding text 1: The Swedish Energy Agency, project number 37712-1 "Structural Batteries for efficient vehicles", is gratefully acknowledged.

Available from: 2019-12-17 Created: 2019-12-17 Last updated: 2019-12-17Bibliographically approved

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