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 MgMn2O4 spinel material. The lower electrical conductivity and mechanical stability of MgMn2O4 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 MgMn2O4@Ni/N-rGO composite when 0.3 % N-rGO and 0.25 % Ni are used, in which MgMn2O4@Ni-0.25 appears as spherical morphology in the N-rGO sheets. The electrochemical findings indicated that the MgMn2O4@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 MgMn2O4@Ni-0.25/NrGO composite possesses excellent potential as a cathode material for RMBs, offering extended cycle life.