On the Mechanism of Magnesium Storage in Microand Nano-Particulate Tin Battery Electrodes
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Author
Nacimiento-Cobos, Francisco José
Cabello, Marta
Pérez-Vicente, C.
Alcántara, Ricardo
Lavela Cabello, Pedro
Ortiz Jiménez, Gregorio F.
Tirado Coello, José Luis
Publisher
MDPIDate
2018Subject
Electrode nanomaterialsMagnesium-tin intermetallics
Magnesium-ion batteries
Sn-119 Mössbauer spectroscopy
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Show full item recordAbstract
This study reports on the electrochemical alloying-dealloying properties of Mg2Sn
intermetallic compounds. 119Sn Mössbauer spectra of -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 the spectra line shape, which is explained by a
multiphase mechanism involving the coexistence of c-Mg2Sn, distorted Mg2����� Sn, and Mg-doped
-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 the MgMn2O4 cathodes. Energy density and cycling properties of the resulting full Mg-ion
cells are also scrutinized