Formation of LiF-rich Cathode-Electrolyte Interphase by Electrolyte Reduction
Formation of LiF-rich Cathode-Electrolyte Interphase by Electrolyte Reduction
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Date
2022-04-08
Authors
Bai, Panxing
Ji, Xiao
Zhang, Jiaxun
Zhang, Weiran
Hou, Singyuk
Su, Hai
Li, Mengjie
Deng, Tao
Cao, Longsheng
Liu, Sufu
Advisor
Citation
P. Bai, X. Ji, J. Zhang, W. Zhang, S. Hou, H. Su, M. Li, T. Deng, L. Cao, S. Liu, X. He, Y. Xu, C. Wang, Angew. Chem. Int. Ed. 2022, 61, e202202731; Angew. Chem. 2022, 134, e202202731.
Abstract
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