Facile Surface Coatings for Performance Improvement of NMC811 Battery Cathode Material

Xiao Guang Sun, Charl J. Jafta, Susheng Tan, Albina Borisevich, Ram B. Gupta, Mariappan Parans Paranthaman

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

High nickel content layered oxide LiNi0.8Mn0.1Co0.1O2 (NMC811) is a promising cathode material with a high theoretical capacity of 200 mAh g-1 for use in high energy density lithium-ion batteries. However, its surface can easily get passivated by LiOH and Li2CO3 due to its surface residual Li2O being reacting with ambient moisture and CO2. Herein, NMC811 was treated in a 3.0 M solution of lithium bis(fluorosulfonyl)imide (LiFSI) in dimethyl carbonate (DMC) at 60 °C for 8 h, 16 h and 24 h, respectively, resulting in coating of the NMC811 surface with LiF due to the basic nature of those residual lithium salts that react with LiFSI. The facile treatment of NMC811 in LiFSI/DMC not only improves the cycling stability but also enhances the capacity of the Li/NMC811 cells, mainly because of the thinning of the Li2CO3 layer as suggested by cyclic voltammograms and impedance analyses. This method opens a new avenue for activation of passivated NMC811 particles for practical battery applications.

Original languageEnglish
Article number020565
JournalJournal of the Electrochemical Society
Volume169
Issue number2
DOIs
StatePublished - Feb 1 2022

Funding

All authors would like to dedicate this research to the Nobel prize winner Professor Goodenough for his 100th birthday celebration. This research was supported by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office. Authors gratefully acknowledge research funding from the U.S. Department of Energy via award DE-EE0009110. A.B. (electron microscopy study) was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division under contract number DE-AC05-00OR22725. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ).

Keywords

  • LiNiMnCoO(NMC811)
  • Lithium bis(fluorosulfonyl)imide (LiFSI)
  • cycling stability
  • heat treatment
  • lithium ion batteries

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