MAGNESIUM COMPOSITE MATERIALS FOR NICKEL–METAL HYDRIDE BATTERIES

Abstract

Amorphous MgNi and MgNi_0.5Co_0.5 composites were prepared by mechanical ball milling in an argon atmosphere. Their electrochemical discharge capacity is characterized by high values: 872 mA•h/g for MgNi and 309 mA•h/g for MgNi_0.5Co_0.5. The cyclic stability (S₃₀) of the MgNi_0.5Co_0.5 electrode (42%) is somewhat higher compared to MgNi (26%). Reduction in the capacity of electrodes is associated with volumetric and corrosive processes. The MgNi_0.5Co_0.5 composite shows higher increase in capacity than MgNi after deep discharge of the electrodes.