Electrochemical activation of Li2MnO3 electrodes at 0°c and its impact on the subsequent performance at higher temperatures

Francis Amalraj Susai, Michael Talianker, Jing Liu, Rosy, Tanmoy Paul, Yehudit Grinblat, Evan Erickson, Malachi Noked, Larisa Burstein, Anatoly I. Frenkel, Yoed Tsur, Boris Markovsky, Doron Aurbach

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12 Scopus citations

Abstract

This work continues our systematic study of Li-and Mn-rich cathodes for lithium-ion batteries. We chose Li2MnO3 as a model electrode material with the aim of correlating the improved electrochemical characteristics of these cathodes initially activated at 0°C with the structural evolution of Li2MnO3, oxygen loss, formation of per-oxo like species (O22−) and the surface chemistry. It was established that performing a few initial charge/discharge (activation) cycles of Li2MnO3 at 0°C resulted in increased discharge capacity and higher capacity retention, and decreased and substantially stabilized the voltage hysteresis upon subsequent cycling at 30°C or at 45°C. In contrast to the activation of Li2MnO3 at these higher temperatures, Li2MnO3 underwent step-by-step activation at 0°C, providing a stepwise traversing of the voltage plateau at >4.5 V during initial cycling. Importantly, these findings agree well with our previous studies on the activation at 0°C of 0.35Li2MnO3·0.65Li[Mn0.45Ni0.35Co0.20]O2 materials. The stability of the interface developed at 0°C can be ascribed to the reduced interactions of the per-oxo-like species formed and the oxygen released from Li2MnO3 with solvents in ethylene carbonate–methyl-ethyl carbonate/LiPF6 solutions. Our TEM studies revealed that typically, upon initial cycling both at 0°C and 30°C, Li2MnO3 underwent partial structural layered-to-spinel (Li2Mn2O4) transition.

Original languageEnglish
Article number4388
Pages (from-to)1-22
Number of pages22
JournalMaterials
Volume13
Issue number19
DOIs
StatePublished - 1 Oct 2020

Bibliographical note

Publisher Copyright:
© 2020 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

  • Bulk and surface characteristics
  • Decreased the voltage hysteresis
  • Layered-to-spinel transition
  • Li-and Mn-rich materials
  • LiMnO activation at 0°C
  • Lithium-ion batteries
  • Stabilized cycling

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