出版日期:2020

简介:Imide-basedelectrolytesaltsarecrucialinlithium-ionbattery(LIB)research,duetotheirhighoxidativecapacity,thermalperformance,andcyclingstability.LIBswithimideelectrolytesexhibitslowcharge-discharge(CD)capacityandhighefficiency,eventhoughmostoftheseelectrolytesshowlowionicconductivity(σ).Herein,wehavesynthesizedtwohighlyconductiveandpuredivalentimideelectrolytes,lithiumsulfonylbis(fluorosulfonyl)imide(LiSFSI)andlithium(1,3-phenylenedisulfonyl)bis(fluorosulfonyl)imide(LiPDSFSI),forLIBsapplication.ComparedtoLiPDSFSIelectrolyte,theLiSFSIimideelectrolytewithmixedsolventethylenecarbonate(EC)anddimethylsulfoxide(DMSO)(75:25v/v)exhibitsbetterelectrochemicalstability,σ,transferencenumber(tL+),cyclingstability,andhighspecificcapacityof142?mAhg?1withthefullcellbatteryconfigurationofLiFePO4/electrolytes/graphiteat0.1C.Additionally,lithiumbis(fluoro-sulfonyl)imide(LiFSI)(20%),asadditive,improvetheirperformancesubstantially.TheresultsdemonstratethattheLiSFSIelectrolytewithLiFSIadditiveshowsmaximumσ(8.9?mS/cmat30?°C),tLi+(0.64),andanodicstability(5.47?V),whichconcurrentlydelivershighefficiencyandimprovesspecificcapacityto156?mAhg?1withexcellentcapacityretention(99.93%)after500CDcycleswiththefullcellLiFePO4/electrolytes/graphitebatterysystem."