Electrochemical Stability and Reversibility of Aqueous Polysulfide Electrodes Cycled Beyond the Solubility Limit

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dc.contributor.authorPan, Menghsuan Samen
dc.contributor.authorSu, Liangen
dc.contributor.authorEiler, Stephanie L.en
dc.contributor.authorJing, Linda W.en
dc.contributor.authorBadel, Andres F.en
dc.contributor.authorLi, Zhengen
dc.contributor.authorBrushett, Fikile R.en
dc.contributor.authorChiang, Yet-Mingen
dc.date.accessioned2022-12-15T13:42:48Zen
dc.date.available2022-12-15T13:42:48Zen
dc.date.issued2022-06en
dc.description.abstractBatteries which use dissolved redox-active species, such as redox flow batteries (RFBs), are often considered to be constrained in their operation and energy density by the solubility limit of the redox species. Here, we show that soluble redox active electrolytes can be reversibly cycled deeply into the precipitation regime, permitting higher effective concentrations, energy densities, and lower costs. Using aqueous sodium polysulfide negative electrolytes cycled in the nominal Na2S2 to Na2S4 capacity range as an example, we show that the effective solubility can be increased from 5 M in the fully-dissolved state to as much as 10 M using the precipitation strategy. Stable cycling was observed at 8 M concentration over more than 1600h at room temperature. We also analyze the range of polysulfide electrochemical stability, and characterize the precipitate composition. This enhanced effective concentration approach may be generalized to other redox chemistries that utilize solubilized reactants, and may be especially useful for long-duration storage applications where slow charge-discharge rates allow equilibration of precipitated species with the redox-active solution.en
dc.description.notesThis work was supported as part of the Joint Center for Energy Storage Research, an Energy Innovation Hub funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences. This work made use of the MRSEC Shared Experimental Facilities at MIT, supported by the National Science Foundation under award number DMR-1419807.en
dc.description.sponsorshipJoint Center for Energy Storage Research, an Energy Innovation Hub - U.S. Department of Energy, Office of Science, Basic Energy Sciences; National Science Foundation [DMR-1419807]en
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1149/1945-7111/ac7669en
dc.identifier.eissn1945-7111en
dc.identifier.issn0013-4651en
dc.identifier.issue6en
dc.identifier.other60524en
dc.identifier.urihttp://hdl.handle.net/10919/112901en
dc.identifier.volume169en
dc.language.isoenen
dc.publisherElectrochemical Societyen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectsulfide solutionsen
dc.subjectoptical-spectraen
dc.subjectenergy-storageen
dc.subjectbatteriesen
dc.subjectconstanten
dc.subjectkineticsen
dc.subjectionsen
dc.titleElectrochemical Stability and Reversibility of Aqueous Polysulfide Electrodes Cycled Beyond the Solubility Limiten
dc.title.serialJournal of the Electrochemical Societyen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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