Bai, PanxingJi, XiaoZhang, JiaxunZhang, WeiranHou, SingyukSu, HaiLi, MengjieDeng, TaoCao, LongshengLiu, SufuHe, XinziXu, YunhuaWang, ChunshengThe capacityof transitionmetal oxide cathodefor Li-ionbatteriescan be furtherenhancedby increas-ing the chargingpotential.However,these high voltagecathodessufferfrom fast capacitydecaybecausethelargevolumechangeof cathodebreaksthe activematerialsand cathode-electrolyteinterphase(CEI),resultingin electrolytepenetrationinto brokenactivematerialsand continuousside reactionsbetweencath-ode and electrolytes.Herein,a robustLiF-richCEI wasformedby potentiostaticreductionof fluorinatedelec-trolyteat a low potentialof 1.7 V. By takingLiCoO2asa modelcathode,we demonstratethat the LiF-richCEImaintainsthe structuralintegrityand suppresseselectro-lyte penetrationat a high cut-offpotentialof 4.6 V. TheLiCoO2with LiF-richCEI exhibiteda capacityof198 mAhgen-USfluorinated electrolytehigh-voltage cathodesLiF-rich Cathode-Electroltye Interphasepotentiostatic reductionArticle