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Effect of Electrolyte Additives on the LiNi$_{0.5}$Mn$_{0.3}$Co$_{0.2}$O$_{2}$ Surface Film Formation with Lithium and Graphite Negative Electrodes

Hekmatfar, Maral; Hasa, Ivana; Eghbal, Ramtin; Carvalho, Diogo V.; Moretti, Arianna; Passerini, Stefano

Abstract:
The effect of various electrolyte additives (fluoroethylene carbonate (FEC), vinylene carbonate (VC), and propane sultone (PS)) on the performance of LiNi0.5Mn0.3Co0.2O2 (NMC532) electrodes in combination with lithium (half‐cell) and graphite (full‐cell) negative electrodes, is herein reported. The cathode/electrolyte interface (CEI) layer formed on the NMC532 electrode cycled up to 4.5 V versus Li+/Li is investigated by X‐ray photoelectron spectroscopy and scanning electron microscopy. This allows correlating the electrochemical performance of the electrodes to the CEI chemical composition, thickness, and morphology. All the investigated electrolyte additives exhibit beneficial effects in half‐ and full‐cell systems, confirming the effective passivation layer formation protecting the electrolyte from further decomposition at high voltages. It is found that the thickness of the CEI layer forming on the NMC532 electrodes in half‐ and full‐cell configuration is different. VC and PS are found to be the best additives to enhance the performance mainly due to their positive contribution to the CEI formation. The solid/electrolyte interphase (SEI) formed on the graphite electrode is also investigated and compared to the CEI layer formed on the cathode. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000104167/pub
Veröffentlicht am 01.03.2021
Postprint §
DOI: 10.5445/IR/1000104167
Veröffentlicht am 20.12.2019
Originalveröffentlichung
DOI: 10.1002/admi.201901500
Scopus
Zitationen: 13
Dimensions
Zitationen: 14
Cover der Publikation
Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2196-7350, 2196-7350
KITopen-ID: 1000104167
HGF-Programm 37.01.01 (POF III, LK 01) Fundamentals and Materials
Erschienen in Advanced materials interfaces
Verlag John Wiley and Sons
Band 7
Heft 1
Seiten Article: 1901500
Vorab online veröffentlicht am 20.11.2019
Nachgewiesen in Web of Science
Dimensions
Scopus
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