Hydrogen-storage alloy particles
AssigneeToyota Jidosha Kabushiki Kaisha
InventorTomoya MATSUNAGA
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Abstract
Novel hydrogen storage alloy particles which include vanadium which can reduce dissolution of vanadium to an alkali aqueous solution over a plurality of charging and discharging cycles when used for a negative electrode of an alkali storage battery are provided. Hydrogen storage alloy particles which contain titanium and vanadium as main components and which have an oxide layer which contains titanium oxide on their surface, the oxide layer having a thickness of 6.2 nm or more, are provided.
Claims6
Hydrogen storage alloy particles which contain titanium and vanadium as main components and which have an oxide layer on their surface, said oxide layer containing titanium oxide and having a thickness of 6.2 nm or more.
A method of production of hydrogen storage alloy particles comprising bringing hydrogen storage alloy particles which contain titanium and vanadium as main components into contact with an alkali aqueous solution to make at least part of said vanadium dissolve out from the surface of said hydrogen storage alloy particles, then making the titanium which remains at the surface of said hydrogen storage alloy particles oxidize.
A method of production of a negative electrode comprising forming a negative electrode active component layer which includes hydrogen storage alloy particles which contain titanium and vanadium as main components, bringing said negative electrode active component layer into contact with an alkali aqueous solution to make at least part of said vanadium dissolve out from the surface of said hydrogen storage alloy particles, then making the titanium which remains at the surface of said hydrogen storage alloy particles oxidize.
Dependencies are inferred from the claim text.