Synthesis and electrochemical performance of an imidazolium based Li salt as electrolyte with Li fluorinated sulfonylimides as additives for Li-Ion batteries
锂离子电池用含氟磺酰亚胺锂添加剂咪唑基锂盐的合成及电化学性能
出版日期:2019
杂志名称:Electrochimica Acta卷号:302
期数:Complete
刊号:0013-4686
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.
