RECHARGEABLE ELECTROCHEMICAL CELL WITH A NEGATIVE ELECTRODE COMPRISING A HYDROGEN ABSORBING ALLOY INCLUDING RARE EARTH COMPONENT

摘要

A rechargeable electrochemical cell a positive electrode, an alkaline electrolyte and a negative electrode made mainly of a hydrogen absorbing alloy containing a mixture of at least two rare earth elements including Ce whose content relative to the total amount of rare earth elements is less than 40 wt % and is preferably 0.1 wt % to 12 wt % or in the range 0.1-8 wt %, which gives still better capacity and life characteristics. Moreover, larger capacity characteristics can be obtained if the negative electrode contains a conductive powder preferably with an average particle diameter of 10 mu m or less as a subsidiary material.