Molten salt synthesis is a facile, extensible and effective way to obtain specific electrode materials with in situ carbon coating. Herein, a carbon coating Mo₆S₈ compounds were synthesized based on molten KCl medium, and the excellent electrochemical Mg-storage performance were demonstrated in rechargeable Mg ion batteries. Benefiting from the in situ carbon coating, the as-synthesized Mo₆S₈@C delivers a high reversible capacity of 90 mAh g^–1 and a superior rate performance. Further mechanism investigation via kinetics testing, ex situ XRD and XPS demonstrate that the carbon coating layer on the surface of Mo₆S₈ could accelerate the electron/ion transport and improve the rate performance and stability of the electrodes. This work provides a possible way to large-scale fabrication of the carbon coating Mo₆S₈ and lays a foundation for the practical applications of Mg ion batteries.

熔盐合成是一种简便、可扩展且有效的获得具有原位碳涂层的特定电极材料的方法。在此，基于熔融 KCl 介质合成了碳涂层 Mo ₆ S _{8化合物，并在可充电镁离子电池中展示了优异的电化学储镁性能。}得益于原位碳涂层，合成后的 Mo ₆ S ₈ @C 具有 90 mAh g ^-1的高可逆容量和卓越的倍率性能。通过动力学测试、非原位 XRD 和 XPS 的进一步机理研究表明，Mo ₆ S _{8表面的碳涂层}可以加速电子/离子传输，提高电极的倍率性能和稳定性。该工作为大规模制备碳涂层Mo ₆ S ₈提供了可能的途径，为镁离子电池的实际应用奠定了基础。