Jump to main content
Jump to site search

Issue 47, 2012
Previous Article Next Article

Observation of the highest Mn3+/Mn2+ redox potential of 4.45 V in a Li2MnP2O7 pyrophosphate cathode

Author affiliations

Abstract

By exploring the pyrophosphate chemistry for rechargeable Li-ion batteries, we report the synthesis and electrochemical characterization of a Li2MnP2O7 cathode. Easily prepared by conventional solid-state synthesis (at 600 °C), the Li2MnP2O7 displays an Mn3+/Mn2+ redox potential centered at 4.45 V versus lithium. It has registered the highest voltage ever obtained for the Mn3+/Mn2+ redox couple in any Mn-based cathode material. Following the pristine and partially (Mn) substituted Li2FeP2O7 (3.5–3.9 V vs. Li) and Li2CoP2O7 (4.9 V vs. Li), which show the highest Fe3+/Fe2+ and Co3+/Co2+ redox potentials among the known cathode compounds, the highest Mn3+/Mn2+ redox voltage (ca. 4.45 V) in Li2MnP2O7 establishes ‘pyrophosphates’ as a novel family displaying the highest M3+/M2+ redox potentials among all polyanionic compounds. Fundamental study of these pyrophosphates can provide useful insights into design of high-voltage cathode materials.

Graphical abstract: Observation of the highest Mn3+/Mn2+ redox potential of 4.45 V in a Li2MnP2O7 pyrophosphate cathode

Back to tab navigation

Publication details

The article was received on 05 Jul 2012, accepted on 26 Sep 2012 and first published on 26 Sep 2012


Article type: Communication
DOI: 10.1039/C2JM35260E
Citation: J. Mater. Chem., 2012,22, 24526-24529
  •   Request permissions

    Observation of the highest Mn3+/Mn2+ redox potential of 4.45 V in a Li2MnP2O7 pyrophosphate cathode

    M. Tamaru, P. Barpanda, Y. Yamada, S. Nishimura and A. Yamada, J. Mater. Chem., 2012, 22, 24526
    DOI: 10.1039/C2JM35260E

Search articles by author

Spotlight

Advertisements