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

摘要: This study reports on the electrochemical alloying-dealloying properties of Mg2Sn intermetallic compounds. 119Sn Mossbauer spectra β-Sn powder, thermally alloyed cubic-Mg2Sn, and an intermediate MgSn nominal composition are used as references. The discharge a Mg/micro-Sn half-cell led to significant changes in line shape, which is explained by multiphase mechanism involving coexistence c-Mg2Sn, distorted Mg2−δSn, Mg-doped β-Sn. Capacities capacity retention were improved using nanoparticulate tin electrodes. material reduces significantly diffusion lengths for magnesium contains surface SnO SnO2, partially electroactive. potentials suitable be combined versus MgMn2O4 cathodes. Energy density cycling resulting full Mg-ion cells also scrutinized.