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    • Review on comprehending and enhancing the initial Coulombic efficiency of anode materials in lithium-ion/sodium-ion batteries

    理解和提高锂离子/钠离子电池阳极材料初始库仑效率的研究进展

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    出版日期： 2020
    标签： Lithium-ion battery Sodium-ion battery Initial Coulombic efficiency Energy density Anode materials

    出版日期:2020

    杂志名称:Nano Energy
    卷号:77
    期数:Complete
    刊号:2211-2855
    出版日期:2020

    简介:Developinglithium-ionbatteries(LIBs)/sodium-ionbatteries(SIBs)withhighenergydensityisvitaltomeetincreasinglydemandingrequirementsforenergystorage.TheinitialCoulombicefficiency(ICE)ofLIBsandSIBsanodematerials,whichisassociatedwiththeamountofredundantcathodematerialsinfullcells,isakeyparameterfortheimprovementofenergydensityinbatteries.Generally,thelowICEofanodematerialsiscompensatedbyadditionalloadingofcathodematerialsincurrentcommercialLIBs.Nevertheless,becausethespecificcapacityofcommonlithium-metaloxidecathodesislowerthanthatofanodes,anexcessiveamountofcathodematerials(10%–15%forgraphiteanodematerial)mustbeaddedtoovercometheinsufficientICEofanodematerials,whichleadstoanappreciablereductionofenergydensity.Specifically,thereductionisabout5%–20%oftotalavailablecapacityincommercialgraphiteelectrodes;and,itcanevenbeashighas15–50%fornext-generationhigh-capacityanodematerials(suchasSiandSn).MuchworkhasbeendevotedtoexploringanodematerialswithhighICEinLIBs/SIBs;however,tothebestofourknowledge,theredoesnotyetexistacomprehensivereview.Herein,weprovideanoverviewofICEofanodematerialsbothinLIBsandSIBs.Inthisreview,wefirstdiscussthecurrentunderstandingoftheassociationbetweenICEandenergydensity.Thisisfollowedbyadetailedassessmentofthereasonsoftheinitialcapacityloss(lowICE)forvarioustypesofanodematerials.AsummaryisthengivenofthegrowingnumberofmethodsandrelatedfundamentalmechanismsbeingusedtoenhanceICE.WeconcludewithaperspectiveonthecurrentchallengesandpromisingresearchdirectionsthatmightleadtofurtherimprovementsoftheICEandthefabricationofhigher-energy-densitybatteries."

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