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2020-11-13Zeitschriftenartikel DOI: 10.1002/ente.202000880
Strategies for Alleviating Electrode Expansion of Graphite Electrodes in Sodium‐Ion Batteries Followed by In Situ Electrochemical Dilatometry
dc.contributor.authorEscher, Ines
dc.contributor.authorKravets, Yuliia
dc.contributor.authorFerrero, Guillermo A.
dc.contributor.authorGOKTAS, Mustafa
dc.contributor.authorAdelhelm, Philipp
dc.date.accessioned2021-02-25T12:57:26Z
dc.date.available2021-02-25T12:57:26Z
dc.date.issued2020-11-13none
dc.date.updated2021-02-22T14:53:23Z
dc.identifier.urihttp://edoc.hu-berlin.de/18452/23136
dc.description.abstractThe electrochemical intercalation/deintercalation of solvated sodium ions into graphite is a highly reversible process, but leads to large, undesired electrode expansion/shrinkage (“breathing”). Herein, two strategies to mitigate the electrode expansion are studied. Starting with the standard configuration (−) sodium | diglyme (2G) electrolyte | graphite (poly(vinylidene difluoride) (PVDF) binder) (+), the PVDF binder is first replaced with a binder made of the sodium salt of carboxymethyl cellulose (CMC). Second, ethylenediamine (EN) is added to the electrolyte solution as a co‐solvent. The electrode breathing is followed in situ (operando) through electrochemical dilatometry (ECD). It is found that replacing PVDF with CMC is only effective in reducing the electrode expansion during initial sodiation. During cycling, the electrode breathing for both binders is comparable. Much more effective is the addition of EN. The addition of 10 v/v EN to the diglyme electrolyte strongly reduces the electrode expansion during the initial sodiation (+100% with EN versus +175% without EN) as well as the breathing during cycling. A more detailed analysis of the ECD signals reveals that solvent co‐intercalation temporarily leads to pillaring of the graphite lattice and that the addition of EN to 2G leads to a change in the sodium storage mechanism.eng
dc.description.sponsorshipDeutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
dc.description.sponsorshipEuropean Research Council http://dx.doi.org/10.13039/100010663
dc.description.sponsorshipBundesministerium für Bildung und Forschung http://dx.doi.org/10.13039/501100002347
dc.language.isoengnone
dc.publisherHumboldt-Universität zu Berlin
dc.rights(CC BY 4.0) Attribution 4.0 Internationalger
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectelectrochemistryeng
dc.subjectin situ electrochemical dilatometryeng
dc.subjectpillared graphiteeng
dc.subjectsodium‐ion batterieseng
dc.subjectsolvated co‐intercalationseng
dc.subject.ddc620 Ingenieurwissenschaften und zugeordnete Tätigkeitennone
dc.titleStrategies for Alleviating Electrode Expansion of Graphite Electrodes in Sodium‐Ion Batteries Followed by In Situ Electrochemical Dilatometrynone
dc.typearticle
dc.identifier.urnurn:nbn:de:kobv:11-110-18452/23136-4
dc.identifier.doi10.1002/ente.202000880none
dc.identifier.doihttp://dx.doi.org/10.18452/22519
dc.type.versionpublishedVersionnone
local.edoc.container-titleEnergy Technologynone
local.edoc.pages7none
local.edoc.type-nameZeitschriftenartikel
local.edoc.institutionMathematisch-Naturwissenschaftliche Fakultätnone
local.edoc.container-typeperiodical
local.edoc.container-type-nameZeitschrift
local.edoc.container-publisher-nameWiley-VCHnone
local.edoc.container-publisher-placeWeinheimnone
dc.description.versionPeer Reviewednone
local.edoc.container-articlenumber2000880none
local.edoc.affiliationEscher, Ines; Institut für Chemie, Humboldt Universität zu Berlin Brook‐Taylor‐Str. 2 12489 Berlin Germanynone
local.edoc.affiliationKravets, Yuliia; Institut für Chemie Humboldt Universität zu Berlin Brook‐Taylor‐Str. 2 12489 Berlin Germanynone
local.edoc.affiliationA. Ferrero, Guillermo; 1 Institut für Chemie Humboldt Universität zu Berlin Brook‐Taylor‐Str. 2 12489 Berlin Germanynone
local.edoc.affiliationGoktas, Mustafa; Institut für Chemie Humboldt Universität zu Berlin Brook‐Taylor‐Str. 2 12489 Berlin Germanynone
local.edoc.affiliationAdelhelm, Philipp; Institut für Chemie Humboldt Universität zu Berlin Brook‐Taylor‐Str. 2 12489 Berlin Germanynone

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