HYDROGEN STORAGE ALLOYS HAVING REDUCED PCT HYSTERESIS
摘要
A modified A<SUB>2</SUB>B<SUB>7</SUB> type hydrogen storage alloy having reduced hysteresis. The alloy consists of a base A<SUB>X</SUB>B<SUB>y</SUB> hydrogen storage alloy, where A includes at least one rare earth<I/>element and also includes magnesium, B includes at least nickel, and the atomic ratio of x to y is between 1:2 and 1:5. The base alloy is modified by the addition of at least one modifier element which has an atomic volume less than about 8 cm<SUP>3</SUP>/mole, and is added to the base<I/>alloy in an amount sufficient to reduce the absorption/desorption hysteresis of the alloy by at least 10% when compared with the base alloy.
