uu.seUppsala universitets publikationer
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Towards more Durable Electrochemical Capacitors by Elucidating the Ageing Mechanisms under Different Testing Procedures
Poznan Univ Tech, Inst Chem & Tech Electrochem, PL-60695 Poznan, Poland.
Poznan Univ Tech, Inst Chem & Tech Electrochem, PL-60695 Poznan, Poland.
Paul Scherrer Inst, Electrochem Lab, CH-5232 Villigen, Switzerland.
Visa övriga samt affilieringar
2019 (Engelska)Ingår i: CHEMELECTROCHEM, ISSN 2196-0216, Vol. 6, nr 2, s. 566-573Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Electrical double-layer capacitors (EDLCs) commonly denoted supercapacitors are rechargeable energy storage devices with excellent power and energy delivery metrics intermediate to conventional capacitors and batteries. High-voltage aqueous electrolyte based EDLCs are particularly attractive due to their high-power capability, facile production, and environmental advantages. EDLCs should last for thousands of cycles and evaluation of future cell chemistries require long-term and costly galvanostatic cycling. Voltage holding tests have been proposed to shorten evaluation time by accelerating cell degradation processes. Whether voltage holding can replace cycling completely remains undemonstrated. In this work, a systematic investigation of the influence of testing procedure on cell performance is presented. The state-of-the-art post-mortem and operando experimental techniques are implemented to elucidate ageing mechanisms and kinetics inside EDLC cells under different testing procedures. Carbon corrosion occurring on the positively polarized electrode leads to the lower active surface area and higher oxygen content. On the contrary, an increase of surface area and micropore volume are observed on the negatively polarized electrode. Repeated galvanostatic cycles at U<1.6 V appears to facilitate the depletion of oxygen species on the positively polarized electrode in comparison with voltage holding, which indicates a more complex degradation mechanism during cycling. Caution is advised when comparing results from different test procedures.

Ort, förlag, år, upplaga, sidor
WILEY-V C H VERLAG GMBH , 2019. Vol. 6, nr 2, s. 566-573
Nyckelord [en]
aqueous supercapacitors, cell ageing, cycling tests, high voltage, voltage holding
Nationell ämneskategori
Den kondenserade materiens fysik
Identifikatorer
URN: urn:nbn:se:uu:diva-376830DOI: 10.1002/celc.201801146ISI: 000456207200037OAI: oai:DiVA.org:uu-376830DiVA, id: diva2:1287474
Forskningsfinansiär
EU, Europeiska forskningsrådet, GA 759603Tillgänglig från: 2019-02-11 Skapad: 2019-02-11 Senast uppdaterad: 2019-02-11Bibliografiskt granskad

Open Access i DiVA

fulltext(1476 kB)44 nedladdningar
Filinformation
Filnamn FULLTEXT01.pdfFilstorlek 1476 kBChecksumma SHA-512
e6d04078b904c3e0aba3ddd6a73f3f85bc0932904754f2b7329d3aa341244d55fd484e0bd618e10998d64d120012ba1daa45ec2059c791afe1b89de92490798e
Typ fulltextMimetyp application/pdf

Övriga länkar

Förlagets fulltext

Personposter BETA

Jämstorp, Erik

Sök vidare i DiVA

Av författaren/redaktören
Jämstorp, Erik
Av organisationen
Strukturkemi
Den kondenserade materiens fysik

Sök vidare utanför DiVA

GoogleGoogle Scholar
Totalt: 44 nedladdningar
Antalet nedladdningar är summan av nedladdningar för alla fulltexter. Det kan inkludera t.ex tidigare versioner som nu inte längre är tillgängliga.

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 49 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf