Method of manufacturing a hydrogen-absorbing alloy for use in an

Details Method of manufacturing a hydrogen-absorbing alloy for use in an Method of manufacturing a hydrogen-absorbing alloy for use in an

1997-11-26

1999-08-24

Jenkins, Daniel J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder pretreatment

419 2, 419 34, 148513, B22F 100

Patent

active

059435453

ABSTRACT:
The object of the present invention is to provide an acid treatment for enhancing the high-rate discharge characteristic, cycle characteristic, and other characteristics of a hydrogen-absorbing alloy electrode to a large extent. The object can be achieved by subjecting a hydrogen-absorbing alloy as a negative electrode active material to an acid treatment comprising the steps of acid-treating the surface of the hydrogen-absorbing alloy by using a metallic ion-containing treatment solution which contains metallic ions and whose initial pH is in the range of 0.5 to 3.0; and heat-treating the hydrogen-absorbing alloy in an atmosphere with the presence of hydrogen.

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