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

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Rauhala, Taina
dc.contributor.author Davodi, Fatemeh
dc.contributor.author Sainio, Jani
dc.contributor.author Sorsa, Olli
dc.contributor.author Kallio, Tanja
dc.date.accessioned 2020-02-12T10:51:33Z
dc.date.available 2020-02-12T10:51:33Z
dc.date.issued 2020-03-10
dc.identifier.citation Rauhala , 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.2020.135735 en
dc.identifier.issn 0013-4686
dc.identifier.issn 1873-3859
dc.identifier.other PURE UUID: efa8ace3-3653-404e-9305-782d80e82753
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/efa8ace3-3653-404e-9305-782d80e82753
dc.identifier.other PURE LINK: http://www.scopus.com/inward/record.url?scp=85078158515&partnerID=8YFLogxK
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/40833672/Manuscript_Rauhala_et_al_acris.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/43138
dc.description.abstract Poor 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.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries Electrochimica Acta en
dc.relation.ispartofseries Volume 336 en
dc.rights openAccess en
dc.title On the stability of polyaniline/carbon nanotube composites as binder-free positive electrodes for electrochemical energy storage en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Department of Chemistry and Materials Science
dc.contributor.department Department of Applied Physics
dc.subject.keyword Conducting polymer
dc.subject.keyword Degradation analysis
dc.subject.keyword Lithium-ion battery
dc.subject.keyword Polyaniline
dc.subject.keyword Thermal treatment
dc.identifier.urn URN:NBN:fi:aalto-202002122207
dc.identifier.doi 10.1016/j.electacta.2020.135735
dc.date.embargo info:eu-repo/date/embargoEnd/2022-01-24

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