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Issue 47, 2012
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Observation of the highest Mn3+/Mn2+ redox potential of 4.45 V in a Li2MnP2O7 pyrophosphate cathode

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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

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Article information


Submitted
05 Jul 2012
Accepted
26 Sep 2012
First published
26 Sep 2012

J. Mater. Chem., 2012,22, 24526-24529
Article type
Communication

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

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