Patent number: 8257862
Abstract: Disclosed is an alkaline storage battery comprising a negative electrode, a positive electrode, a separator and an alkaline electrolyte solution in a package can. The negative electrode contains a hydrogen storage alloy represented by the following general formula: Ln1-xMgx(Ni1-yTy)z (wherein Ln represents at least one element selected from lanthanoid elements, Ca, Sr, Sc, Y, Ti, Zr and Hf; T represents at least one element selected from V, Nb, Ta, Cr, Mo, Mn, Fe, Co, Al, Ga, Zn, Sn, In, Cu, Si, P and B; and 0<x?1, 0?y?0.5 and 2.5?z?4.5) as a negative electrode active material. In this alkaline storage battery, the hydrogen equilibrium pressure (P) is regulated to satisfy 0.02 MPa?P?0.11 MPa when the hydrogen amount stored in the hydrogen storage alloy (H/M (atomic ratio)) at 40° C. is 0.5.
Type:
Grant
Filed:
September 15, 2006
Date of Patent:
September 4, 2012
Assignee:
SANYO Electric Co., Ltd.
Inventors:
Yoshinobu Katayama, Shuhei Yoshida, Hiromasa Sugii, Yasuyuki Harada, Yoshihiro Masuda, Makoto Ochi, Masao Takee