Electrochemistry beyond Mn4+ in LixMn1-yLiyO2

A R Armstrong, P G Bruce

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35 Citations (Scopus)

Abstract

Electrodes based on the layered compounds Li-x[Mn1-yLiy]O-2, y less than or equal to 0.2, have been charged in the electrolyte, 1 m LiPF6 in ethylene carbonate/diethyl carbonate (1:2 v/v). Initially Li+ removal is accompanied by oxidation of Mn3+ to Mn4+. Once all Mn is in the 4+ oxidation state further Li+ removal occurs by two unconventional mechanisms, one involving oxidation of O2- with subsequent O loss (effective removal of Li2O) and the other electrolyte oxidation generating H+ which exchanges for Li+ in the electrode. Although both mechanisms appear to occur at 30 and 55degreesC, the former dominates at both temperatures in contrast to Li2MnO3. (C) 2003 The Electrochemical Society.

Original languageEnglish
Number of pages4
JournalElectrochemical and Solid-State Letters
Volume7
DOIs
Publication statusPublished - Jan 2004

Keywords

  • RECHARGEABLE LITHIUM BATTERIES
  • MANGANESE OXIDES
  • ION-EXCHANGE
  • ELECTRODE
  • SPINEL
  • CELLS
  • LI
  • PERFORMANCE
  • MECHANISM
  • INSERTION

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