The present invention provides a nickel-zinc battery of an inside-out structure,
that is, a battery comprising a positive electrode containing beta-type nickel
oxyhydroxide and a negative electrode containing zinc and having a similar structure
to an alkali manganese battery, in which the beta-type nickel oxyhydroxide consists
of substantially spherical particles, mean particle size of which is within a range
from 19 m to a maximum of 40 m, the bulk density of which is within
a range from 1.6 g/cm3 to a maximum of 2.2 g/cm3, tap density
of which is within a range from 2.2 g/cm3 to a maximum of 2.7 g/cm3,
specific surface area which based on BET method is within a range from 3 m2/g
to a maximum of 50 m2/g, and the positive electrode of the nickel zinc
battery contains graphite powder, where the weight ratio of graphite powder against
a total weight of the positive electrode is defined within a range from 4% to a
maximum of 8%.
