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Powder-impregnated carbon fibers with lithium iron phosphate as positive electrodes in structural batteries
KTH Royal Institute of Technology, Sweden.
RISE Research Institutes of Sweden, Materials and Production, Manufacturing Processes.ORCID iD: 0000-0003-4860-8763
RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites.ORCID iD: 0009-0005-9763-5823
RISE Research Institutes of Sweden, Materials and Production.
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2023 (English)In: Composites Science And Technology, ISSN 0266-3538, E-ISSN 1879-1050, Vol. 241, article id 110153Article in journal (Refereed) Published
Abstract [en]

A structural battery is a multifunctional battery that can carry a load while storing energy. Structural batteries have been a cutting-edge research focus in the last decade and are mainly based on polyacrylonitrile (PAN)-carbon fibers (CFs). In this work, positive electrodes based on PAN-carbon fibers were manufactured with powder impregnation (siphon impregnation) technique using a water-based slurry containing lithium iron phosphate (LFP) as the active electrode material and the water-soluble binder polyethylene glycol (PEG). Different coating compositions, electrode-drying temperatures, and coating parameters were investigated to optimize the coating uniformity and the electrochemical performances. Scanning electron microscopy results showed that the electrode materials coat the CFs uniformly, conformably, and individually. Electrochemical characterization of pouch cells shows that the electrodes containing 6 wt% PEG dried at 140 °C have the best battery performance, delivering a first discharge capacity of 151 mAh g−1 and capacity retention higher than 80% after 100 cycles. Moreover, excellent capacity reversibility was achieved when the electrodes were cycled at multiple C-rates attesting to their stability. The results demonstrate that CFs perform excellently as current collectors in positive electrodes. 

Place, publisher, year, edition, pages
Elsevier Ltd , 2023. Vol. 241, article id 110153
Keywords [en]
Carbon fibers, LiFePO4, Lithium-ion battery, Siphon impregnation, Structural positive electrode, Coatings, Electric discharges, Electrochemical electrodes, Impregnation, Iron compounds, Lithium-ion batteries, Scanning electron microscopy, Active electrode materials, Cutting edges, Energy, Impregnated carbons, Positive electrodes, Research focus, Structural batteries, Water-based slurry, Lithium compounds
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:ri:diva-66009DOI: 10.1016/j.compscitech.2023.110153Scopus ID: 2-s2.0-85166619398OAI: oai:DiVA.org:ri-66009DiVA, id: diva2:1790318
Note

The authors acknowledge Oxeon AB for supplying spread tow carbon fibers. This research was funded by VINNOVA (Sweden’s Innovation Agency) Competence Centre BASE- Batteries Sweden.

Available from: 2023-08-22 Created: 2023-08-22 Last updated: 2024-05-22Bibliographically approved

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Adolfsson, ErikDykhoff, HenrikTrey, StacyWysocki, Maciej

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Manufacturing ProcessesPolymeric Materials and CompositesMaterials and ProductionCorrosion
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