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Descripción
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| Wedescribethesynthesis,crystalstructure,magneticandelectrochemicalcharacterizationofnewrock salt-relatedoxidesofformula,Li3M2RuO6 (M¿Co, Ni).The M¿Co oxideadoptstheLiCoO2 (R-3m) structure, wheresheetsofLiO6 and (Co2/Ru)O6 octahedra arealternatelystackedalongthe c-direction. The M¿Ni oxidealsoadoptsasimilarlayeredstructurerelatedtoLi2TiO3, wherepartialmixingofLiand Ni/Ru atomslowersthesymmetrytomonoclinic(C2/c). Magneticsusceptibilitymeasurementsreveal that inLi3Co2RuO6, theoxidationstatesoftransitionmetalionsareCo3+ (S¿0), Co2+ (S¿1/2) andRu4+ (S¿1), alloftheminlow-spinconfigurationandat10K,thematerialordersantiferromagnetically. Analogous Li3Ni2RuO6 presents aferrimagneticbehaviorwithaCurietemperatureof100K.The differences inthemagneticbehaviorhavebeenexplainedintermsofdifferencesinthecrystalstructure. Electrochemical studiescorrelatewellwithbothmagneticpropertiesandcrystalstructure.Li-transition metal intermixingmaybeattheoriginofthemoreimpededoxidationofLi3Ni2RuO6 when comparedto Li3Co2RuO6. Interestinglyhigh first chargecapacities(betweenca.160and180mAhg?1) corresponding to ca.2/3oftheoreticalcapacityarereachedalbeit,inbothcases,capacityretentionandcyclabilityare not satisfactoryenoughtoconsiderthesematerialsasalternativestoLiCoO2 | |
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Internacional
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Si |
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JCR del ISI
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Si |
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Título de la revista
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Journal of Solid State Chemistry |
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ISSN
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0022-4596 |
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Factor de impacto JCR
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2,04 |
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Información de impacto
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Datos JCR del año 2012 |
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Volumen
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203 |
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DOI
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Número de revista
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Desde la página
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160 |
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Hasta la página
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165 |
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Mes
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SIN MES |
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Ranking
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