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Issue 11, 2015
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Oligomeric-Schiff bases as negative electrodes for sodium ion batteries: unveiling the nature of their active redox centers

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Abstract

Oligomeric Schiff bases with carboxylate end-groups are crystalline, electrochemically active materials at voltages below 1.2 V vs. Na+/Na. This low redox voltage along with delivered capacities up to 340 mA h g−1 makes them potential anode materials for sodium ion batteries. The electrochemical performance is optimized by maximizing the number of active units with respect to the total chain length. We report for the first time the electrochemical activity of the 10-π-electron end group (–OOC–ϕ–C[double bond, length as m-dash]N–) (ϕ refers to the phenyl group) and central (–N[double bond, length as m-dash]C–ϕ–C[double bond, length as m-dash]N–) Hückel units. This enhanced activity is due to the larger stability of planar molecular regions with respect to out-of-plane inactive (–OOC–ϕ–N[double bond, length as m-dash]C–) and (–C[double bond, length as m-dash]N–ϕ–N[double bond, length as m-dash]C–), as confirmed by DFT calculations.

Graphical abstract: Oligomeric-Schiff bases as negative electrodes for sodium ion batteries: unveiling the nature of their active redox centers

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Supplementary files

Article information


Submitted
14 Jun 2015
Accepted
24 Aug 2015
First published
24 Aug 2015

Energy Environ. Sci., 2015,8, 3233-3241
Article type
Paper
Author version available

Oligomeric-Schiff bases as negative electrodes for sodium ion batteries: unveiling the nature of their active redox centers

M. López-Herraiz, E. Castillo-Martínez, J. Carretero-González, J. Carrasco, T. Rojo and M. Armand, Energy Environ. Sci., 2015, 8, 3233
DOI: 10.1039/C5EE01832C

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