资源描述：
《Battery materials for ultrafast charging and discharging》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、Vol458
2、12March2009
3、doi:10.1038/nature07853LETTERSBatterymaterialsforultrafastcharginganddischarging11ByoungwooKang&GerbrandCederThestorageofelectricalenergyathighchargeanddischargerateisdiagramrepresentstheoptimalcoatingcompositionswithgoodanimportanttechnologyintoday’ssociety,andcanenablehy
4、bridlithiumionconductivity.andplug-inhybridelectricvehiclesandprovideback-upforwindOursynthesisstrategyhasbeentocreateanappropriateoff-andsolarenergy.Itistypicallybelievedthatinelectrochemicalstoichiometryinthestartingmaterialssothatthecoatingconstituentssystemsveryhighpowerratescanonlybeach
5、ievedwithsuper-phase-separatefromLiFePO4asitformsduringtheheattreatment,capacitors,whichtradehighpowerforlowenergydensityastheytherebycreatingtheactivestoragematerialandcoatinginasingleonlystoreenergybysurfaceadsorptionreactionsofchargedprocess.Herewedescriberesultswithaniron:phosphorusdefic
6、iency1–34,5speciesonanelectrodematerial.Hereweshowthatbatteriesratioof2:1(forexampleLiFe122yP12yO42d,y50.05),asindicatedbywhichobtainhighenergydensitybystoringchargeinthebulkofaarrowAinSupplementaryFig.1.Wenotethatthemorecommonmaterialcanalsoachieveultrahighdischargerates,comparabletoone-to-
7、oneiron:phosphorusdeficiency(arrowBinSupplementary22thoseofsupercapacitors.WerealizethisinLiFePO4(ref.6),aFig.1,equivalenttolithiumexcess)createsamixtureofLi3PO4and7,8materialwithhighlithiumbulkmobility,bycreatingafastironoxides,whicharenotlikelytoconductwellunderthesynthesision-conductingsu
8、rfacephasethroughcontrolledoff-stoichiometry.conditionsusedtoprepareLiFePO4.Aratecapabilityequivalenttofullbatterydischargein10–20scanLiFe0.9P0.95O42dwassynthesizedbyball-millingLi2CO3,beachieved.FeC2O4?2H2OandNH4H2PO4inappropriateamounts,heatingtheLikeanylithiumbatterymaterial,LiFePO4absorb
9、sandreleasesmixtureat350uCfor10handthenheatingat600uCfor10hunderenergybythesimultaneousextractionand,respectively,insertionofargon.X-raydiffraction(Fig.1aandSupplementaryFig.2)showsthat1Liionsandelectrons.Hence,thepowercapabilityofalithiumdespiteth
