Suppressing Electrolyte Decomposition at Cathode/Electrolyte Interface by Mg-Fe Binary Oxide Coating towards Room-Temperature Magnesium Rechargeable Battery Operation (Supporting Information)

For practical room-temperature magnesium rechargeable battery operation, utilizing the nano-sized MgMn2O4 spinel as cathode material is effective way to have high rate-capabilities; however, electrolyte decomposition at the cathode/electrolyte interface is inevitable. In this work, a Mg-Fe binary oxide is coated onto nano-sized MgMn2O4 to form stable cathode electrolyte interface (CEI). This developed cathode material suppresses the electrolyte decomposition and improves the cyclability at room temperature.为实现实用化的室温可充电镁电池（room-temperature magnesium rechargeable battery）运行，采用纳米级MgMn₂O₄尖晶石（nano-sized MgMn₂O₄ spinel）作为正极材料是获得高倍率性能的有效途径；然而，正极/电解液界面处的电解液分解（electrolyte decomposition）难以避免。本研究中，我们将镁铁二元氧化物（Mg-Fe binary oxide）包覆于纳米级MgMn₂O₄尖晶石表面，以构筑稳定的正极电解液界面（CEI）。该改性正极材料可抑制电解液分解，并改善室温条件下的循环稳定性。