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Enhanced electrical and mechanical properties of nanographite electrodes for supercapacitors by addition of nanobrillated cellulose
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.ORCID iD: 0000-0001-7329-3359
2014 (English)Conference paper, Poster (Refereed)
Abstract [en]

Graphene and other porous carbon materials are widely used as electrodes in supercapacitors. In order to form mechanically stable electrodes, binders can be added to the conducting electrode material. However, most binders degrade the electrical performance of the electrodes. Here we show that by using nanobrillated cellulose (NFC) as binder the electrical properties, such as sheet-resistance, were enhanced. NFC is a good ion conductor and improves the access of ions to the electrodes. Thus electrodes made of a mixture of nanographite and NFC achieved larger capacitances in supercapacitors than electrodes with nanographite only. The lowest sheet-resistance and the highest capacitance were measured at NFC contents of 10{15% in ratio to the total amount of active material. Furthermore, NFC formed a network that improved the mechanical stability of the electrodes signicantly. Beside the mechanical stability, NFC stabilized the aqueous nanographite dispersion that was used to prepare the electrodes. NFC avoids the restacking of the delaminated graphene akes by forming a ber network between the graphene layers.

Place, publisher, year, edition, pages
2014.
Keyword [en]
nanographite, nano fibrillated cellulose, cellulose nanofibers, supercapacitors
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:miun:diva-28791OAI: oai:DiVA.org:miun-28791DiVA: diva2:971385
Conference
28th International Winterschool on Electronic Properties of Novel Materials: Molecular Nanostructures (IWEPNM 2014), Kirchberg, Austria
Available from: 2016-09-16 Created: 2016-09-16 Last updated: 2016-10-10Bibliographically approved

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Andres, BrittaForsberg, SvenOlin, Håkan
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