PNNL team develops sodium

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1、PNNLteamdevelopssodium-manganeseoxideelectrodesforsodium-ionrechargeablebatteries7June2011DischargecapacityofNa4Mn9O18nanowirescalcinedat750°Casafunctionofcharge/dischargecyclesatdifferentcharge/dischargecurrentdensitiesof12(0.1C),24(0.2C),60(0.5C),120(1C),and240mAg-1(2C).Cr

2、edit:Caoetal.Clicktoenlarge.AteamofscientistsattheUSDepartmentofEnergy’sPacificNorthwestNationalLaboratory(PNNL)andvisitingresearchersfromWuhanUniversityinWuhan,Chinahavedevelopedsinglecrystallinesodium-manganeseoxide(Na4Mn9O18)nanowiresthatshowahigh,reversiblesodiumioninser

3、tion/extractioncapacity,excellentcyclingability,andpromisingratecapabilityforsodium-ionbatteryapplications.Theresultingimprovedelectricalcapacityandrecharginglifetimeofthenanowiresmakesthemapromisingcandidatetoconstructaviableandlow-costNa-ionbatterysystemforupcomingpowerand

4、energystoragesystems,theteamconcludesinapaperpublishedinthejournalAdvancedMaterials.Toconnectintermittentrenewableenergysources(i.e.,solarandwind)withvariableoutputtotheelectricalgrid,gridmanagersrequireelectricalenergystoragesystems(EES)thatcanaccommodatelargeamountsofenerg

5、ycreatedatthesource.(Earlierpost.)Lithium-ionrechargeablebatteriesperformwell,butaretooexpensiveforwidespreaduseonthegrid.Sodiumisseenbysomeasapromisingalternative,butthesodium-sulfurbatteriescurrentlyinuserunattemperaturesabove300°C,makingthemlessenergyefficientandsafethanb

6、atteriesthatrunatambienttemperatures.Sodium-ionbatterieshavebeendiscussedintheliteratureforsometime.AbatterythatusesNaionsinsteadofLiionsisattractivebecauseitcouldpotentiallybemuchlessexpensiveandsafer,anditwouldbemoreenvironmentallybenign.ANaionintercalationandstoragemechan

7、ismisalsoscientificallyinterestingandchallengingbecauseNaionsareabout70%largerinradiusthanLiions.ThismakesitdifficulttofindasuitablehostmaterialtoaccommodatetheNaionsandallowreversibleandrapidioninsertionandextraction.—Caoetal.Otherworkhasshownthathard-carbon–basednegativeel

8、ectrodeshavebeenreportedtodeliveracapacityof300mAhg-1throughasodiumioninser