| A Mg2Ni alloy was chosen to investigate the effects of a ball milling treatment on the alloy's electrochemical characteristics when the alloy was used as an electrode in a Ni-MH (metal hydride) battery. The mechanical grinding (MG) treatment was carried out in a Spex 8000 high-energy mill with ball milling times ranging from 0.5hrs to 80hrs, and ball-to-powder weight ratios ranging from 1:1 to 10:1. The structural changes taking place on ball milling were determined using X-ray diffraction and SEM (Scanning Electron Microscopy) techniques. Electrodes were fabricated from the ball-milled Mg 2Ni powders, and electrochemical measurements were made in a 6M KOH solution using a Solartron 1285 Potentiostat/Galvanostat. These measurements were used to determine electrochemical properties, including exchange current density, i0, polarization resistance, RP, and charge/discharge characteristics.;The equivalency of P-C-T and E-C-T curves at room temperature was demonstrated for a LaNi4.7Al0.3 alloy. (Abstract shortened by UMI.). |
