Sanyo Electric Co., Ltd.

Yoshihiro Masuda

Mamoru Kimoto

Makoto Ochi

Teruhiko Imoto

Nobuyuki Higashiyama

Masao Takee

Kikuko Kato

Yasuhiko Itoh

Masutaka Ouchi

Yasuyuki Harada

Hiromasa Sugii

Yoshinobu Katayama

Shuhei Yoshida

Takashi Nagase

Hideyuki Asanuma

Satoru Kometani

Eiji Enishi

Toshiyuki Kondo

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: LnMg(NiT)(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&#x3c;x&#x2266;1, 0&#x2266;y&#x2266;0.5 and 2.5&#x2266;z&#x2266;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&#x2266;P&#x2266;0.11 MPa when the hydrogen amount stored in the hydrogen storage alloy (H/M (atomic ratio)) at 40&#xb0; C. is 0.5.

Alkaline storage battery

A battery including an outer casing, positive and negative electrodes provided in the outer casing, and an electrolyte provided therebetween. The outer casing is electrically connected to one of the positive and negative electrodes to constitute one of electrode terminals. The other is connected to the other electrode terminal which is electrically insulated from the outer casing. At least one of the positive and negative electrodes and the electrode terminal are connected to each other through a collector, which includes a plate-shaped body section and a connecting piece extended in an almost vertical direction from an end of the body section. The body section or the connecting piece is provided with a bending guide section which can be bent in such a direction that the connecting piece approaches the body section.

Collector used for an alkali storage battery

A hydrogen storage alloy electrode containing, as a principal active material, a powder of hydrogen storage alloy having a CaCu crystal structure and represented by the formula MmNi Co Mn M where M is at least one element selected from aluminum (Al) and copper (Cu), x is between 3.0 and 5.2, y is between 0 and 1.2, z is between 0.1 and 0.9, w is between 0.1 and 0.9, and the sum of x, y, z and w is between 4.4 and 5.4. The hydrogen storage alloy powder particles have a surface region and a bulk region enclosed within the surface region and have a higher nickel content in the surface region than in the bulk region. The hydrogen storage alloy electrode further contains an oxide and/or hydroxide of at least one rare-earth element selected from ytterbium (Yb), samarium (Sm), erbium (Er) and gadolinium (Gd).

Hydrogen storage alloy electrode and method for manufacture thereof

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Itano-gun, Japan

Yoshihiro Masuda