High precision coulometry of commercial PAN-based carbon fibers as electrodes in structural batteries
2016 (Engelska)Ingår i: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 163, nr 8, s. A1790-A1797Artikel i tidskrift (Refereegranskat) 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.
Ort, förlag, år, upplaga, sidor
Electrochemical Society Inc. , 2016. Vol. 163, nr 8, s. A1790-A1797
Nyckelord [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
Nationell ämneskategori
Naturvetenskap
Identifikatorer
URN: urn:nbn:se:ri:diva-42173DOI: 10.1149/2.0041609jesScopus ID: 2-s2.0-84978063168OAI: oai:DiVA.org:ri-42173DiVA, id: diva2:1379460
Anmärkning
Funding details: 37712-1; Funding text 1: The Swedish Energy Agency, project number 37712-1 "Structural Batteries for efficient vehicles", is gratefully acknowledged.
2019-12-172019-12-172020-12-01Bibliografiskt granskad