Electrochemical charge-discharge characteristics of composites based on Mg2Ni/Mg and transition metals

Mechanical ball milling of Mg2Ni/Mg alloys with transition metal (Ni, Co, Cu) powders resulted in the formation of nanostructured or amorphous materials. Negative electrodes based on these synthesized composites exhibited improved electrochemical charge-discharge properties. Specifically, the electrode containing the Mg2Ni + Ni composite achieved a high initial discharge capacity of 810 mAh/g. While the composites with cobalt and copper showed lower capacity than with the nickel composite, their cyclic stability was somewhat better. The electrodes remained amorphous during cycling. However, after a certain time of operation, they began to show signs of degradation, particularly the formation of magnesium hydroxide.