| 摘要 |
PROBLEM TO BE SOLVED: To provide a nickel hydrogen storage battery of which high temperature storage characteristics that a voltage drop at high temperature storage is small, and a capacity recovery factor after high temperature storage is large, are improved. SOLUTION: In the nickel hydrogen storage battery consists of a paste type nickel electrode as a positive electrode 1 containing a cobalt electric conduction assistant containing metal cobalt or a cobalt compound with water oxidation nickel, a negative electrode 2 consists of a rare earth group system alloy expressed by MmNi5-X+YMX (Mm expresses the rare earth group elements which contain La at least, and M expresses a metallic element containing Mn at least, and is 0<x<2, -0.2<y<0.6) as a hydrogen storage alloy of a negative electrode 2, a separator 3 which is intervened among these two electrodes, and an electrolyte consists of an alkaline aqueous solution, when quantity of electricity required to deoxidize cobalt oxide in a positive electrode to a valence of 2 is set to Cco(II) and quantity of electricity of a discharge reserve currently formed in the negative electrode is set to CH2, a relation of CH2/Cco(II)<=1.3 is satisfied. |
