新型磷酸盐类钠离子电池正极材料的分析-analysis of new type phosphate sodium ion battery cathode material.docx

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新型磷酸盐类钠离子电池正极材料的分析-analysis of new type phosphate sodium ion battery cathode material.docx

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新型磷酸盐类钠离子电池正极材料的分析-analysis of new type phosphate sodium ion battery cathode material

率接近100%，而且以1C和2C放电倍率循环100圈，容量基本没有衰减，表现出了极佳的循环稳定性。关键词：能源存储；钠离子电池；正极材料；电化学性能；ABSTRACTAmongenergystoragetechnology,secondarybatteryisofgreatsignificanceinenergystorageandconversion.Lithiumionbatteriescurrentlyoccupythemainmarketforportablemobileelectronicdevices,andisrapidlydevelopingtothehybridelectricvehiclesmarket,whichwillleadtogreatlyincreaseofthedemandoflithium,however,Lithiumresourcesareverylimitedontheearth.Basedonthepresentsituationandthedemand,abundantsodiumenteredpeoplesfieldofvision,lithiumandsodiumareinthesamegroupwithsimilarchemicalproperties.ThepotentialofNa+/Nais2.71Vvs.thestandardelectrodepotential,andtheoreticalspecificcapacityofNais1166mAh/g.SThecontentofsodiumintheearthscrustismuchhigherthanlithiumandtheoceancontainshugeamountsofsodium,refiningofsodiumisstraightforward.Therefore,sodiumionbatterieswillbeaverypromisingenergystoragetechnology.Inthisarticle,wechoseNa4Co3(PO4)2P2O7andNa3V2(PO4)3astheresearchobject,preparingNa4Co3(PO4)2P2O7/CNTsbyasol-gelmethodandcharacterizingitselectrochemicalpropertieswhenit’susedasacathodeofsodiumionbattery.ResultsshowedthatcarbonnanotubescanfromacontinuouselectricallyconductivenetworkbetweenactivematerialswhichgreatlyincreasedtheelectricalconductivityofNa4Co3(PO4)2P2O7.At1C,5C,10C,20C,thereversiblecapacitywas80mAh/g,60mAh/g,40mAh/g,30mAh/grespectively,andexhibitedagoodcyclingperformance.WesynthesizedNa3V2(PO4)3/Cbyasolidphasemethodandasofttemplatemethod,andexploredtheinfluenceofsynthesisconditionsonthemorphologyofmaterials.CharacterizingstructureandmorphologybyX-raydiffraction(XRD)andFieldemissionscanningelectronmicroscopy(FESEM),theresultsshowthattheproductpreparedat800oChadgoodcrystalline,productsobtainedatlowertemperatureorforshortertimehadpoorcrystallineorwithimpurities.Inthetemplatesynthesis,wecangetNa3V2(PO4)3/Ccompositematerialwithlargeporousandthree-dimensionalcarbonskeletonat650oCfor12h,thisframeworkstructurewouldcollapsewhenweextendedtimeto14horincreasdtemperatureto800oC.WepreparedNa3V2(PO4)3/Ccompositemate