The Catalytic Effect of Graphene Oxide on Magnesium Hydride-Based Anode for Lithium/Sodium-Ion Battery

Abstract

In the field of rechargeable batteries, magnesium hydride (MgH2) is one of the promising candidates among all metal hydrides due to its remarkable properties but their practical application is limited due to some disadvantages such as poor reversibility, slow kinetics, and unsatisfactory cyclability. In view of the above, the present work focused on, MgH2-catalyzed by graphene oxide (GO) as anode materials for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs) in which MgH2 nanoparticles synthesized via ball-milling are catalyzed with graphene oxide (5 wt.% of MgH2). The MgH2 anode shows the initial discharge/charge capacity of 158/50 mAhg-1 and MgH2 catalyzed with GO (MgH2-GO) anode exhibited excellent electrochemical performance with 370/259 mAhg-1 and the MgH2-GO anode shows a capacity retention of 239 mAhg-1 at a high current density of 200 mAg-1 after 100 cycles for LIBs. In the case of SIBs, the MgH2 anode shows the initial discharge/charge capacity of 126/40 mAhg-1 and capacity retention of 14 mAhg-1 at a high current density of 200 mAg-1 after 100 cycles, and the MgH2-GO anode shows the initial discharge/charge capacity of 272/142 mAhg-1 and capacity retention of 79 mAhg-1 at a high current density of 200 mAg-1 after 100 cycles.