Change search
ReferencesLink to record
Permanent link

Direct link
Electrode Mass Balancing as an Inexpensive and Simple Method to Increase the Capacitance of Electric Double-Layer Capacitors
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: 0000-0002-4303-2585
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
Show others and affiliations
2016 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 11, no 9, 1-12 p., e0163146Article in journal (Refereed) Published
Abstract [en]

Symmetric electric double-layer capacitors (EDLCs) have equal masses of the same active material in both electrodes. However, having equal electrode masses may prevent the EDLC to have the largest possible specific capacitance if the sizes of the hydrated anions and cations in the electrolyte differ because the electrodes and the electrolyte may not be completely utilized. Here we demonstrate how this issue can be resolved by mass balancing. If the electrode masses are adjusted according to the size of the ions, one can easily increase an EDLC's specific capacitance. To that end, we performed galvanostatic cycling to measure the capacitances of symmetric EDLCs with different electrode mass ratios using four aqueous electrolytes-Na2SO4, H2SO4, NaOH, and KOH (all with a concentration of 1 M)-and compared these to the theoretical optimal electrode mass ratio that we calculated using the sizes of the hydrated ions. Both the theoretical and experimental values revealed lower-than-1 optimal electrode ratios for all electrolytes except KOH. The largest increase in capacitance was obtained for EDLCs with NaOH as electrolyte. Specifically, we demonstrate an increase of the specific capacitance by 8.6% by adjusting the electrode mass ratio from 1 to 0.86. Our findings demonstrate that electrode mass balancing is a simple and inexpensive method to increase the capacitance of EDLCs. Furthermore, our results imply that one can reduce the amount of unused material in EDLCs and thus decrease their weight, volume and cost.

Place, publisher, year, edition, pages
2016. Vol. 11, no 9, 1-12 p., e0163146
Keyword [en]
Mass balancing, capacitance, electric double layer capacitor, EDLC, electrode, electrolyte, electrode mass ratio, ion size ratio
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:miun:diva-29083DOI: 10.1371/journal.pone.0163146ISI: 000383893200073ScopusID: 2-s2.0-84992186879OAI: oai:DiVA.org:miun-29083DiVA: diva2:1033887
Available from: 2016-10-10 Created: 2016-10-10 Last updated: 2016-11-14Bibliographically approved

Open Access in DiVA

fulltext(1066 kB)17 downloads
File information
File name FULLTEXT01.pdfFile size 1066 kBChecksum SHA-512
742ae0fee9f811fccf93f5e9b5ebd076640b417bb32190dae52c0341505dd9c90c482f1b6b6c0c19894bd60cee3788c0dce3097ff0e95836432042c7deb40668
Type fulltextMimetype application/pdf

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Andres, BrittaEngström, Ann-ChristineBlomquist, NicklasForsberg, SvenDahlström, ChristinaOlin, Håkan
By organisation
Department of Natural SciencesDepartment of Chemical Engineering
In the same journal
PLoS ONE
Condensed Matter Physics

Search outside of DiVA

GoogleGoogle Scholar
Total: 17 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 72 hits
ReferencesLink to record
Permanent link

Direct link