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Issue 27, 2011
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Benefits of N for O substitution in polyoxoanionic electrode materials: a first principles investigation of the electrochemical properties of Li2FeSiO4yNy (y = 0, 0.5, 1)

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Abstract

First principles calculations have been used to investigate the effect of N for O substitution on the electrochemical properties of Li2FeSiO4. Within the Li2FeSiO4 structure, hypothetical models of the N-substituted Li2FeSiO3N and Li2FeSiO3.5N0.5 have been analyzed. The computational results indicate that the lithium deinsertion voltage associated to the Fe3+/Fe4+ redox couple can be decreased by N substitution (4.86 V in Li2FeSiO4, 4.7 V in Li2FeSiO3.5N0.5 and 4.1 V in Li2FeSiO3N). The high theoretical specific capacity of Li2FeSiO4 (330 mA h g−1) could be retained in N-substituted silicates thanks to the oxidation of N3− anions. The redox activity of N ions is observed in a voltage range of ca. 3.5–4.2 V. In the light of the potential benefits of N substitution for O experimental work is encouraged, in particular to investigate the reversibility and overpotential of the N redox reaction.

Graphical abstract: Benefits of N for O substitution in polyoxoanionic electrode materials: a first principles investigation of the electrochemical properties of Li2FeSiO4−yNy (y = 0, 0.5, 1)

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Publication details

The article was received on 03 Dec 2010, accepted on 10 Feb 2011 and first published on 07 Mar 2011


Article type: Paper
DOI: 10.1039/C0JM04216A
Citation: J. Mater. Chem., 2011,21, 10026-10034
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    Benefits of N for O substitution in polyoxoanionic electrode materials: a first principles investigation of the electrochemical properties of Li2FeSiO4yNy (y = 0, 0.5, 1)

    M. Armand and M. E. Arroyo y de Dompablo, J. Mater. Chem., 2011, 21, 10026
    DOI: 10.1039/C0JM04216A

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