Tailoring asymmetric discharge-charge rates and capacity limits to extend Li-O2 battery cycle life

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dc.contributor.authorGeaney, Hugh
dc.contributor.authorO'Dwyer, Colm
dc.contributor.funderSeventh Framework Programmeen
dc.contributor.funderScience Foundation Irelanden
dc.date.accessioned2017-08-02T11:25:43Z
dc.date.available2017-08-02T11:25:43Z
dc.date.issued2017-01-27
dc.date.updated2017-08-02T11:09:46Z
dc.description.abstractWidespread issues with the fundamental operation and stability of Li-O2 cells impact cycle life and efficiency. While the community continues to research ways of mitigating side reactions and improving stability to realize Li-O2 battery prospects, we show that limiting the depth-of-discharge while unbalancing discharge/charge rate symmetry can extend Li-O2 battery cycle life by ensuring efficient reversible Li2O2 formation, markedly improving cycle life. Systematic variation of the discharge/charge currents shows that clogging from discharging the Li-O2 cell at high current (250 μA) can be somewhat negated by recharging with a lower applied current (50 μA), with a marked improvement in cycle life achievable. Our measurements determined that specific reduction of the depth of discharge in decrements from equivalent capacities of 1000 mAhg-1 to 50 mAhg-1 under symmetric discharge/charge currents of 50 μA strongly affected the cumulative discharge capacity of each cell. A maximum cumulative discharge capacity was found to occur at ~10 % depth of discharge (500 mAhg-1) and the cumulative discharge capacity of 39,500 mAhg-1 was significantly greater than cells operated at higher and lower depths of discharge. The results emphasize the importance of appropriate discharge/charge rate and depth of discharge selection for other cathode/electrolyte combinations for directly improving cycle life performances of Li-O2 batteries.en
dc.description.sponsorshipScience Foundation Ireland (Grant Numbers: 13/TIDA/E2761 and 14/IA/2581)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationGeaney, H. and O'Dwyer, C. (2017) 'Tailoring asymmetric discharge-charge rates and capacity limits to extend Li-O2 battery cycle life', ChemElectroChem, 4, pp. 628-635. doi:10.1002/celc.201600662en
dc.identifier.doi10.1002/celc.201600662
dc.identifier.endpage635en
dc.identifier.issn2196-0216
dc.identifier.journaltitleChemElectroChemen
dc.identifier.startpage628en
dc.identifier.urihttps://hdl.handle.net/10468/4417
dc.identifier.volume4en
dc.language.isoenen
dc.publisherJohn Wiley & Sons, Inc.en
dc.relation.projectinfo:eu-repo/grantAgreement/EC/FP7::SP1::NMP/314508/EU/STable high-capacity lithium-Air Batteries with Long cycle life for Electric cars/STABLEen
dc.rights© 2017, John Wiley & Sons, Inc. This is the peer reviewed version of the following article: Geaney, H. and O'Dwyer, C. (2017) 'Tailoring asymmetric discharge-charge rates and capacity limits to extend Li-O2 battery cycle life', ChemElectroChem, 4, pp. 628-635. doi:10.1002/celc.201600662, which has been published in final form at http://dx.doi.org/10.1002/celc.201600662 This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.en
dc.subjectLi-air batteryen
dc.subjectLi-O2 batteryen
dc.subjectEnergy storageen
dc.subjectCarbon nanotubeen
dc.subjectCathodeen
dc.subjectElectrochemistryen
dc.titleTailoring asymmetric discharge-charge rates and capacity limits to extend Li-O2 battery cycle lifeen
dc.typeArticle (peer-reviewed)en
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