Recent progress on selenium-based cathode materials for rechargeable magnesium batteries: A mini review

Abstract Rechargeable magnesium batteries have received increasing interest because of the prominent advantages, including high security, low cost, and high energy density. The development of rechargeable magnesium batteries is hindered by the sluggish Mg2+ ion diffusion kinetics, which makes the exploration of high-performance cathode materials a problem. Recently researchers have exploited various selenium-based cathodes for rechargeable magnesium batteries. Herein, we have critically reviewed these advancements, studying different types of reaction mechanisms and analyzing the electrochemical performance of cathode materials in rechargeable magnesium batteries. Besides, as key materials for rechargeable magnesium batteries, the exploit and optimization of electrolytes are discussed as well, including the selection of reagents, the effect of Li salts, and the compatibility between electrodes and electrolytes. Finally, promising directions are proposed for future rechargeable magnesium batteries based on selenium-based cathode materials.