Nickel electrode for alkaline secondary battery and alkaline secondary battery including nickel electrode

A nickel positive electrode for an alkaline secondary battery, the nickel positive electrode comprising:

• a positive electrode core having a conductive porous structure;
• and
• a positive electrode mixture, comprising positive electrode active material particles, conductive material, a positive electrode additive, water, and a binder, permeated in the conductive porous structure of the positive electrode core,
• wherein the positive electrode active material particles comprise nickel hydroxide and an Al solid solution in a crystalline structure, with sulfate salt contained in the crystalline structure of the particles, and
• wherein a weight ratio of a S component contained in the sulfate salt contained in the particles to a Ni component in the particles is 0.28% or more and 1.50% or less.