PURPOSE: To provide a paste type Ni electrode which possesses a stable capacity characteristic having a high utilization rate over a wide temperature range.
CONSTITUTION: Ni (OH) which is obtained through the precipitation in the alkaline aqueous solution having a pH of 13 or higher by NaOH or KOH, using NI, II group elements, Co, and the sulfuric acid salt thereof as starting materials, is used as active material. When Zn is used as the II group element, the content of Zn is at least 2wt.%, and the content of Co is at least 2wt.%, and the total content is within 10wt.% or less. Further, in some cases, Zn as the II group element is not used in single, and a part of Zn may be substituted by a kind of the II group elements other than Zn. With this constitution, the electrode swelling is prevented without containing the harmful heavy metals in the Ni electrode, and a paste type Ni electrode having a superior electric charging effect in a wide temperature range can be obtained.
WATADA MASAHARU
OSHITANI MASAHIKO
