Alkaline storage cell and hydrogen storage alloy for negative electrode of alkaline storage cell
AssigneeSanyo Electric Co., Ltd.
InventorsTakahiro Endo, Masaru Kihara, Tatsuya Aizawa
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Abstract
An alkaline storage cell has a positive electrode, a negative electrode containing a hydrogen storage alloy, and an alkaline electrolyte. The hydrogen storage alloy has a composition expressed by a general expression: ((PrNd)αLn1-α)1-βMgβNiγ-δ-εAlδTε, where Ln represents at least one element chosen from a group consisting of La, Ce, etc., T represents at least one element chosen from a group consisting of V, Nb, etc., and subscripts α, β, γ, δ and ε represent numerical values which satisfy 0.7<α, 0.05<β<0.15, 3.0≦γ≦4.2, 0.15≦δ≦0.30 and 0≦ε≦0.20.
Claims16
An alkaline storage cell comprising:
- a positive electrode;
- an alkaline electrolyte;
- and
- a negative electrode containing a hydrogen storage alloy, the hydrogen storage alloy having a composition expressed by a general expression:
- ((PrNd)αLn1-α)1-βMgβNiγ-δ-εAlδTε
- (where Ln represents at least one element chosen from a group consisting of La, Ce, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Ca, Sr, Sc, Y, Ti, Zr and Hf, T represents at least one element chosen from a group consisting of V, Nb, Ta, Cr, Mo, Mn, Fe, Co, Zn, Ga, Sn, In, Cu, Si, P and B, and subscripts α, β, γ, δ and ε represent numerical values which satisfy 0.7<α≦1, 0.08<β<12, 3.0≦γ≦4.2, 0.15≦δ≦0.30 and 0≦ε≦0.20.
A hydrogen storage alloy for a negative electrode of an alkaline storage cell, having composition expressed by a general expression:
- ((PrNd)αLn1-α)1-βMgβNiγ-δ-εAlδTε
- (where Ln represents at least one element chosen from a group consisting of La, Ce, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Ca, Sr, Sc, Y, Ti, Zr and Hf, T represents at least one element chosen from a group consisting of V, Nb, Ta, Cr, Mo, Mn, Fe, Co, Zn, Ga, Sn, In, Cu, Si, P and B, and subscripts α, β, γ, δ and ε represent numerical values which satisfy 0.7<α≦1, 0.08<β<0.12, 3.0≦γ≦4.2, 0.15≦δ≦0.30 and 0≦ε≦0.20.
Dependencies are inferred from the claim text.