EFFECT OF TEMPERATURE ON PERFORMANCE OF LANI4.76SN0.24 METAL HYDRIDE ELECTRODE

The effect of temperature on the performance of a LaNi4.76Sn0.24 metal hydride electrode was investigated in the temperature range of 0 to 5 0 degrees C. The electrode showed a maximum discharge capacity at 25 d egrees C. The total resistance increases with a decrease of temperatur e from 50 degrees C to 0 degrees C. The apparent activation enthalpies at different states of charge were determined by evaluating the polar ization resistance at different temperatures. It was found that the ap parent activation enthalpy is an indicator of the relative reaction ra te of the charge-transfer reaction and hydrogen absorption.