Hydrogen-absorbing alloy powder, method for treating the surface thereof, negative electrode for alkaline storage battery, and alkaline storage battery
OwnerKyoko Nakatsuji, Hideaki Ohyamainventors
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Abstract
Provided is a hydrogen occluding alloy powder having an ideally activated surface state where oxide and hydroxide precipitated on the surface of said powder have been removed quickly with a simple means. The method for surface treating a hydrogen occluding alloy powder involves agitating a hydrogen occluding alloy powder containing Ni and Mg with an Ni content from 35 to 60 wt % in a lithium hydroxide aqueous solution (first process). Then the hydrogen occluding alloy powder is agitated in an alkali metal hydroxide aqueous solution containing at least either one of sodium hydroxide and potassium hydroxide (second process).
Claims12
A method for treating a surface of a hydrogen-absorbing alloy powder, comprising:
- a first step of stirring a first mixture that comprises a hydrogen-absorbing alloy powder containing Ni and Mg and having a Ni content of 35 to 60% by weight and a lithium hydroxide aqueous solution;
- and
- a second step of stirring a second mixture that comprises the hydrogen-absorbing alloy powder subjected to the first step and an alkali metal hydroxide aqueous solution of at least one of sodium hydroxide and potassium hydroxide.
Dependencies are inferred from the claim text.