Chemical & Biomolecular Engineering

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Formerly known as the Department of Chemical Engineering.

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Formation of LiF-rich Cathode-Electrolyte Interphase by Electrolyte Reduction
(Wiley, 2022-04-08) Bai, Panxing; Ji, Xiao; Zhang, Jiaxun; Zhang, Weiran; Hou, Singyuk; Su, Hai; Li, Mengjie; Deng, Tao; Cao, Longsheng; Liu, Sufu; He, Xinzi; Xu, Yunhua; Wang, Chunsheng
The 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 mAhg