Preprint Article Version 1 This version is not peer-reviewed

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

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

How to cite: 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. Preprints 2018, 2018060151 (doi: 10.20944/preprints201806.0151.v1). 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. Preprints 2018, 2018060151 (doi: 10.20944/preprints201806.0151.v1).

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 Mg2-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.

Subject Areas

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

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