Improved Performance of Li-metal|LiNi0.8Co0.1Mn0.1O2 Cells with High-Loading Cathodes and Small Amounts of Electrolyte Solutions Containing Fluorinated Carbonates at 30 °c-55 °c

Elena Markevich, Gregory Salitra, Michal Afri, Yosef Talyosef, Doron Aurbach

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Abstract

Herein, we report on the performance of stable lithium metal | LiNi0.8Co0.1Mn0.1O2 (NCM 811) cells with practical electrodes loading of 3.4 mAh cm-2 and small amounts of electrolyte solutions, at 30 °-55 °C. The latter contained 1 M LiPF6 in fluoroethylene carbonate (FEC)/difluoroethylene carbonates (DFEC)/dimethyl carbonate (DMC) 1:1:8, around 0.7-1.7 μl mg-1 of active cathode material (14-33 μl cm-2). Using DFEC as a co-solvent enables to overcome drastic capacity fading of Li metal|NCM cells containing practical amounts (≤1.2 μl mg-1 NCM 811) of electrolyte solutions based on FEC/DMC. The lithium metal anodes were characterized by scanning electron microscope (SEM), Energy Dispersive X-ray Spectroscopy (EDS) and Fourier transform infrared spectroscopy (FTIR). The surface films formed on Li anodes cycled in solutions containing FEC and DFEC are composed mainly of their reduction products. In solutions containing FEC and DFEC the role of the latter is to prevent a fast consumption of FEC, by the formation of surface films enriched with its reduction products. Then, minor FEC surface reactions maintain effective electrodes passivation during prolonged cycling. This work clarifies the important role of fluorinated alkyl carbonate co-solvents in stabilizing high energy density secondary batteries based on Li metal anodes.

Original languageEnglish
Article number070509
JournalJournal of the Electrochemical Society
Volume167
Issue number7
DOIs
StatePublished - 5 Jan 2020

Bibliographical note

Publisher Copyright:
© 2020 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited.

Funding

A partial support for this work was obtained by the Israel High Committee of High Education and the Prime Ministry office in the framework of INREP (Israel National Research center for Electrochemical Propulsion).

FundersFunder number
Israel High Committee of High Education
Israel National Research Center for Electrochemical Propulsion

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