Improving the Electrochemical Performance of the Li₄Ti₅O₁₂ Electrode in a Rechargeable Magnesium Battery by Lithium–Magnesium Co‐Intercalation

Rechargeable magnesium batteries have attracted recent research attention because of abundant raw materials and their relatively low‐price and high‐safety characteristics. However, the sluggish kinetics of the intercalated Mg 2+ ions in the electrode materials originates from the high polarizing ability of the Mg 2+ ion and hinders its electrochemical properties. Here we report a facile approach to improve the electrochemical energy storage capability of the Li 4 Ti 5 O 12 electrode in a Mg battery system by the synergy between Mg 2+ and Li + ions. By tuning the hybrid electrolyte of Mg 2+ and Li + ions, both the reversible capacity and the kinetic properties of large Li 4 Ti 5 O 12 nanoparticles attain remarkable improvement.