Active materials for the positive electrode in alkaline storage

Details Active materials for the positive electrode in alkaline storage Active materials for the positive electrode in alkaline storage

1998-08-06

2000-11-28

Nuzzolillo, Maria

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Electrode

429224, 296231, 428545, 423138, 423599, 252518, H01M 432, C01G 100

Patent

active

061533343

ABSTRACT:
The energy density of active materials for a positive electrode comprising an oxide containing Ni as a main metallic element is enhanced, and, moreover, a method for manufacturing them is provided. The oxide includes Ni as a main metallic element and contains at least Mn in the state of solid solution or eutectic mixture, wherein the average valence of Mn is 3.3 valences or more, the tap density is 1.7 g/cc or more, the half width of a peak at around 2.theta.=37-40.degree. of X-ray diffraction using CuK.alpha. ray is 1.2 deg or less, the ratio B/A of integrated intensity B of a peak at around 2.theta.=18-21.degree. to integrated intensity A of a peak at around 2.theta.=37-40.degree. is 1.25 or less, and the volume of pores having a pore radius of 40 .ANG. or less is 60% or more of the total pore volume. The oxide is obtained by growing in the state of keeping the dissolved oxygen concentration in the aqueous solution in the reaction vessel and then oxidizing the oxide.

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