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dc.contributor.author선양국-
dc.date.accessioned2016-12-12T05:04:55Z-
dc.date.available2016-12-12T05:04:55Z-
dc.date.issued2015-05-
dc.identifier.citationDALTON TRANSACTIONS, v. 44, NO 17, Page. 7881-7886en_US
dc.identifier.issn1477-9226-
dc.identifier.issn1477-9234-
dc.identifier.urihttp://pubs.rsc.org/en/Content/ArticleLanding/2015/DT/C5DT00971E#!divAbstract-
dc.identifier.urihttp://hdl.handle.net/20.500.11754/24786-
dc.description.abstractThe electroactive orthophosphate Na2Co2Fe(PO4)(3) was synthesized using a solid state reaction. Its crystal structure was solved using the combination of powder X-ray-and neutron-diffraction data. This material crystallizes according to the alluaudite structure (S.G. C2/c). The structure consists of edge sharing [MO6] octahedra (M = Fe, Co) resulting in chains parallel to [-101]. These chains are linked together via the [PO4] tetrahedra to form two distinct tunnels in which sodium cations are located. The electrochemical properties of Na2Co2Fe(PO4)(3) were evaluated by galvanostatic charge-discharge cycling. During the first discharge to 0.03 V, Na2Co2Fe(PO4)(3) delivers a specific capacity of 604 mA h g(-1). This capacity is equivalent to the reaction of more than seven sodium ions per formula unit. Hence, this is a strong indication of a conversion-type reaction with the formation of metallic Fe and Co. The subsequent charge and discharge involved the reaction of fewer Na ions as expected for a conversion reaction. When discharged to 0.9 V, the material intercalated only one Na+-ion leading to the formation of a new phase Na3Co2Fe(PO4)(3). This phase could then be cycled reversibly with an average voltage of 3.6 V vs. Na+/Na and a capacity of 110 mA h g(-1). This result is in good agreement with the theoretical capacity expected from the extraction/insertion of two sodium atoms in Na2Co2Fe(PO4)(3).en_US
dc.description.sponsorshipNeutron diffraction was conducted at ORNL's High Flux Isotope Reactor sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. The authors thanks Prof. B. El Bali for the fruitful discussion, and Dr. H. Cao for helping in collecting the NPD data.en_US
dc.language.isoenen_US
dc.publisherROYAL SOC CHEMISTRYen_US
dc.subjectBOND-VALENCE PARAMETERSen_US
dc.subjectLITHIUM BATTERIESen_US
dc.subjectELECTRODE MATERIALSen_US
dc.subjectANODE MATERIALen_US
dc.subjectCAPACITYen_US
dc.subjectCATHODEen_US
dc.subjectSTABILITYen_US
dc.subjectPHOSPHATEen_US
dc.subjectNA2FEPO4Fen_US
dc.subjectPHASESen_US
dc.titleAlluaudite Na2Co2Fe(PO4)(3) as an electroactive material for sodium ion batteriesen_US
dc.typeArticleen_US
dc.relation.no17-
dc.relation.volume44-
dc.identifier.doi10.1039/c5dt00971e-
dc.relation.page7881-7886-
dc.relation.journalDALTON TRANSACTIONS-
dc.contributor.googleauthorEssehli, R.-
dc.contributor.googleauthorBelharouak, I.-
dc.contributor.googleauthorBen Yahia, H.-
dc.contributor.googleauthorMaher, K.-
dc.contributor.googleauthorAbouimrane, A.-
dc.contributor.googleauthorOrayech, B.-
dc.contributor.googleauthorCalder, S.-
dc.contributor.googleauthorZhou, X. L.-
dc.contributor.googleauthorZhou, Z.-
dc.contributor.googleauthorSun, Y-K.-
dc.relation.code2015000901-
dc.sector.campusS-
dc.sector.daehakCOLLEGE OF ENGINEERING[S]-
dc.sector.departmentDEPARTMENT OF ENERGY ENGINEERING-
dc.identifier.pidyksun-
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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