On the stability of polyaniline/carbon nanotube composites as binder-free positive electrodes for electrochemical energy storage

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorRauhala, Taina
dc.contributor.authorDavodi, Fatemeh
dc.contributor.authorSainio, Jani
dc.contributor.authorSorsa, Olli
dc.contributor.authorKallio, Tanja
dc.contributor.departmentDepartment of Chemistry and Materials Science
dc.contributor.departmentDepartment of Applied Physics
dc.date.accessioned2020-02-12T10:51:33Z
dc.date.available2020-02-12T10:51:33Z
dc.date.embargoinfo:eu-repo/date/embargoEnd/2022-01-24
dc.date.issued2020-03-10
dc.description.abstractPoor stability restricts the use of polyaniline as a transition-metal-free, high-capacity electrode material for electrochemical energy storage. To improve the durability, methods such as adding a carbonaceous support and thermal treatments have been suggested. Here, we combine both of these approaches and study their effects on the degradation of a composite of polyaniline and acid-treated multi-walled carbon nanotubes (PANI/a-MWNT) when used as a positive electrode in a lithium-ion cell. The composite is prepared through facile ultrasonic-assisted mixing of aqueous colloids, processed into binder-free electrodes and heat treated under vacuum (120–180 °C). PANI without the carbon support presents a poor cycling stability due to a decreasing conductivity and changes in the particle morphology. The a-MWNTs are shown to inhibit these changes and to enhance the electrochemical accessibility of PANI in the composite. The heat treatment, in turn, improves the stability of the composite during open circuit conditions, which is ascribed to cross-linking of the polymer. However, with prolonged cycling, the stabilizing effect is lost. Analysis of the electrodes after the cycling reveals that both the pristine and the heat-treated composite undergo dedoping and side reactions with the electrolyte. The extent of the changes is larger for the pristine composite.en
dc.description.versionPeer revieweden
dc.format.mimetypeapplication/pdf
dc.identifier.citationRauhala , T , Davodi , F , Sainio , J , Sorsa , O & Kallio , T 2020 , ' On the stability of polyaniline/carbon nanotube composites as binder-free positive electrodes for electrochemical energy storage ' , Electrochimica Acta , vol. 336 , 135735 . https://doi.org/10.1016/j.electacta.2020.135735en
dc.identifier.doi10.1016/j.electacta.2020.135735
dc.identifier.issn0013-4686
dc.identifier.issn1873-3859
dc.identifier.otherPURE UUID: efa8ace3-3653-404e-9305-782d80e82753
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/efa8ace3-3653-404e-9305-782d80e82753
dc.identifier.otherPURE LINK: http://www.scopus.com/inward/record.url?scp=85078158515&partnerID=8YFLogxK
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/40833672/Manuscript_Rauhala_et_al_acris.pdf
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/43138
dc.identifier.urnURN:NBN:fi:aalto-202002122207
dc.language.isoenen
dc.publisherPERGAMON-ELSEVIER SCIENCE LTD
dc.relation.ispartofseriesElectrochimica Actaen
dc.relation.ispartofseriesVolume 336en
dc.rightsopenAccessen
dc.subject.keywordConducting polymer
dc.subject.keywordDegradation analysis
dc.subject.keywordLithium-ion battery
dc.subject.keywordPolyaniline
dc.subject.keywordThermal treatment
dc.titleOn the stability of polyaniline/carbon nanotube composites as binder-free positive electrodes for electrochemical energy storageen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
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