| 摘要 |
PROBLEM TO BE SOLVED: To obtain a hydrogen storage alloy easy in production, high in initial characteristics, high in the capacity and having a long service life by treating alloy powder occluded with hydrogen with a soln. contg. at least one kind of organic acid contg. sulfuric acid or the salt thereof. SOLUTION: This hydrogen storage alloy is not particularly limited, the one used for a negative electrode can selectively be used properly and among them, generally, an LnNi5 series alloy is preferable. The hydrogen storage alloy powder is treated with a soln of organic acid or the salt thereof and is washed as necessary. As the organic acid, the one having a sulfur group is preferable, sulfonic acid, sulfinic acid, sulfenic acid are used and for example, it can suitably be selected from sulfamic acid, sulfanilic acid, sulfaminobenzoic acid, sulfosalicylic acid, sulfobenzoic acid and sulfoacetic acid. These organic acids contain isomers and can be used alone or as the mixture and among them, 5-sulfosalicyclic acid and 2-hydroxy-sulfobenzoic acid are preferable in particular. |
