Tailoring Nickel-Rich LiNi0.8Co0.1Mn0.1O2Layered Oxide Cathode Materials with Metal Sulfides (M2S:M = Li, Na) for Improved Electrochemical Properties

Sri Harsha Akella, Sarah Taragin, Ayan Mukherjee, Ortal Lidor-Shalev, Hagit Aviv, Melina Zysler, Daniel Sharon, Malachi Noked*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

LiNi0.8Co0.1Mn0.1O2 (NCM811) is a promising cathode material for long range electric vehicles. However, the material suffers severe chemo-mechanical degradation that can cause gradual capacity loss upon prolonged cycling. Surface passivation of NMC811 was demonstrated to help in retaining the structural integrity of the material upon extended cycling. Herein, we report the surface passivation of the NCM811 using Li2S and Na2S precursors via direct and simple wet chemical treatment, for the mitigation of parasitic reactions at the electrode electrolyte interphase. This phenomenon is accompanied by increase in the oxidation state of sulfur (from sulfide to sulfate) and partial reduction in the oxidation state of nickel. Electrochemical performance measurements show that the M2SO4 (M: Li, Na) protection layer on NMC811 behaves as an artificial cathode electrolyte interphase (ACEI) that enhance the capacity retention by 25% during prolong cycling with respect to the untreated NMC811. Postmortem morphology studies reveal that the thin metal sulfates coatings remain on the cathode even after 100 cycles, while the untreated NCM811 shows severe morphological instabilities. Our study demonstrates that by simple chemical treatment of NMC811 can enhance its overall stability and cycling performance for the development of advanced high energy density Lithium-ion battery systems.

Original languageAmerican English
Article number080543
JournalJournal of the Electrochemical Society
Volume168
Issue number8
DOIs
StatePublished - Aug 2021

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© 2021 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited.

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