出版日期:2019

简介:Herein,wereportthesynthesisofanovelimidazolium-basedionicsalt,lithium(fluorosulfonyl)((3-(1-methyl-1H-imidazol-3-ium-3-yl)propyl)sulfonyl)bis(fluorosulfonyl)imide(LiFSMIPFSI)asanelectrolytefortheapplicationinlithium-ionbattery(LIB).Theas-synthesizedLiFSMIPFSIexhibitedhighpurityandyield,whichwascharacterizedbyvariousspectroscopictechniques.TheLiFSMIPFSIelectrolytewithamixedsolventofethylenecarbonate(EC)anddimethylsulfoxide(DMSO)(75:25v/v)showedawideelectrochemicalstability(ca.4.5?Vvs.Li/Li+)andhighthermalstability(300?°C),goodLi+conductivity(ca.8.02?mS/cmat30?°C),andlowintrinsicviscosity,whichconcurrentlydeliveredaspecificdischargecapacityofca.125?mAhg?1at0.1?CwiththefullLIBconfigurationofLiFePO4/electrolytes/graphite.TheperformanceofthisLiFSMIPFSIelectrolytewasenhancedfurtherbytheadditionofconventionallithiumbis(fluoro-sulfonyl)imide(LiFSI)andlithiumbis(trifluoromethylsulfonyl)imide(LiTFSI)ionicsalts(20%each)asadditiveswiththespecificdischargecapacityofca.147and139?mAhg?1,respectively,at0.1?C.ThisismainlyduetotheadditionalenhancementofLi+conductivityanditsconcentrationsintheelectrolytesinducedbytheadditives.TheLiFSMIPFSIelectrolytewithLiFSIadditivebasedLIBshowedthehighestcyclingstability(capacityretentionca.97%)amongtheelectrolytesafter500charge-dischargecycles.Thus,thepresentworkcontributestothedevelopmentofnewionicsaltsanditseffectsupontheadditionofadditivesonLIBperformance.