Self-Healable, High-Stability Anode for Rechargeable Magnesium Batteries Realized by Graphene-Confined Gallium Metal

In this work, a self-healable, high-stability anode material for rechargeable magnesium batteries (RMBs) has been developed by introducing a core-shell structure of Ga confined by reduced graphene oxide (Ga@rGO). Via this Ga@rGO anode, a specific capacity of 150 mAh g^-1 at a current of 0.5 A g^-1 stable up to 1200 cycles at room temperature and a specific capacity of 100 mAh g^-1 under an ultrahigh current of 1 A g^-1 stable up to 700 cycles at a slightly elevated temperature of 40 °C have been achieved. Additionally, the ultrahigh rate, high-cycling stability, and long-cycle life of the anode are attributed to the stabilized structure; such a low-cost, simple, and environmentally friendly direct drop coating (DDC) method is developed to maximize the original state of the active materials. Remarkably, the self-healing ability of anodes is still presented under the ultrahigh charging current. This anode is promising for the development of high rate and high stability RMBs.