A facile approach to introducing high-stable and long-life cathode material based on MgMn2O4@Ni0.25 composite nitrogen-doped reduced graphene oxide for rechargeable Mg batteries

The development of rechargeable magnesium batteries (RMBs) has gained attention as a potential solution for large-scale energy storage due to their high energy density and safety. However, finding cathode materials that can maintain excellent cycling stability is a significant obstacle in their development. This study represents the first attempt to examine the impact of various parameters on the composition and electrochemical capabilities of MgMn ₂O ₄ spinel material. The lower electrical conductivity and mechanical stability of MgMn ₂O ₄ have been improved simultaneously by nickel doping and composite nitrogen-doped reduced graphene oxide (N-rGO). The results showed that the final product is a MgMn ₂O ₄@Ni/N-rGO composite when 0.3 % N-rGO and 0.25 % Ni are used, in which MgMn ₂O ₄@Ni _0.25 appears as spherical morphology in the N-rGO sheets. The electrochemical findings indicated that the MgMn ₂O ₄@Ni _0.25/NrGO composite demonstrated remarkable rate performance, with an outstanding initial discharge specific capacity of 250 mAh.g ^-1 at 500 mA. g ^-1, as well as long-lasting cycle stability of over 250 cycles at 500 mA. g ^-1. Based on these outcomes, it can be concluded that the MgMn ₂O ₄@Ni _0.25/NrGO composite possesses excellent potential as a cathode material for RMBs, offering extended cycle life.