Formation of LiF-rich Cathode-Electrolyte Interphase by Electrolyte Reduction

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.

DRUM DOI

https://doi.org/10.13016/dspace/vw1m-qpxv

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

URI (handle)

http://hdl.handle.net/1903/30575

Collections

Chemical and Biomolecular Engineering Research Works

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