On the Mechanism of Magnesium Storage in Micro- and Nano-Particulate Tin Battery Electrodes

Francisco Nacimiento; Marta Cabello; Carlos Pérez-Vicente; Ricardo Alcántara; Pedro Lavela; Gregorio F. Ortiz; José L. Tirado

doi:10.20944/preprints201806.0151.v1

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preprints.org > chemistry and materials science > electrochemistry > doi: 10.20944/preprints201806.0151.v1

Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

On the Mechanism of Magnesium Storage in Micro- and Nano-Particulate Tin Battery Electrodes

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Version 1 : Received: 8 June 2018 / Approved: 11 June 2018 / Online: 11 June 2018 (10:55:38 CEST)

A peer-reviewed article of this Preprint also exists.

Nacimiento, F.; Cabello, M.; Pérez-Vicente, C.; Alcántara, R.; Lavela, P.; Ortiz, G.F.; Tirado, J.L. On the Mechanism of Magnesium Storage in Micro- and Nano-Particulate Tin Battery Electrodes. Nanomaterials 2018, 8, 501. Nacimiento, F.; Cabello, M.; Pérez-Vicente, C.; Alcántara, R.; Lavela, P.; Ortiz, G.F.; Tirado, J.L. On the Mechanism of Magnesium Storage in Micro- and Nano-Particulate Tin Battery Electrodes. Nanomaterials 2018, 8, 501.

Abstract

A study is reported on the electrochemical alloying-dealloying properties of Mg₂Sn intermetallic compounds. ¹¹⁹Sn Mössbauer spectra of β-Sn powder, thermally alloyed cubic-Mg₂Sn and an intermediate MgSn nominal composition are used as references. The discharge of a Mg/micro-Sn half-cell led to significant changes in spectra line shape that are explained by a multiphase mechanism involving the coexistence of c-Mg₂Sn, distorted Mg_2-δSn and Mg-doped β-Sn. Capacities and capacity retention were improved by using nanoparticulate tin electrodes. This material reduces significantly the diffusion lengths for magnesium and contains surface SnO and SnO₂, which are partially electroactive. The half-cell potentials were suitable to be combined versus MgMn₂O₄ cathodes. Energy density and cycling properties of the resulting full Mg-ion cells are also scrutinized.

Keywords

electrode nanomaterials; magnesium-tin intermetallics; magnesium-ion batteries; Sn-119 Mössbauer spectroscopy

Subject

Chemistry and Materials Science, Electrochemistry

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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