Alkaline secondary battery, paste type positive electrode for alkaline secondary battery, method for manufacturing alkaline secondary battery

A method of manufacturing an alkaline secondary battery comprising the steps of:

• preparing a secondary battery unit including a positive electrode, a negative electrode and an alkaline electrolyte containing lithium hydroxide of 0.5 mol/ or more, said positive electrode comprising a conductive substrate and a mixture held by said conductive substrate, said mixture containing a cobalt compound and nickel hydroxide;
• and
• performing an initial charging of said secondary battery unit at a temperature of 40 to 100.degree. C. so as to form pores in said positive electrode, said pores being 0.0001 .mu.m to 10 .mu.m in diameter.

A paste positive electrode for an alkaline secondary battery, which comprises a conductive substrate, a cobalt compound and nickel hydroxide:

• wherein said cobalt compound contains .beta. type cobalt hydroxide having a half-width of less than 0.40.degree. of a peak in the (001) plane as measured by X-ray powder diffraction (2.theta.) using Cu-K.alpha. ray as an X-ray source.

A paste electrode for an alkaline secondary battery, which comprises a conductive substrate, a cobalt compound and nickel hydroxide:

• wherein said cobalt compound contains cobalt monoxide having a half-width of 0.50.degree. or less a peak in the (200) plane as measured by X-ray powder diffraction (2.theta.) using Cu-K.alpha. ray as an X-ray source.

An alkaline secondary battery comprising a positive electrode containing nickel hydroxide, a negative electrode and an alkaline electrolyte;

• wherein said nickel hydroxide has a half-width of 0.8.degree. or more of a peak in the (101) plane as measured by X-ray powder diffraction (2.theta.) using Cu-K.alpha. ray as an X-ray source;
• and said alkaline electrolyte contains 2.0 to 6.0 mol/ potassium hydroxide, 2.0 to 5.0 mol/ sodium hydroxide, and 0.5 to 1.5 mol/ lithium hydroxide.

An alkaline secondary battery comprising a paste positive electrode comprising a conductive substrate and a mixture held by said conductive substrate and containing an active material, and a paste negative electrode comprising a conductive substrate and a mixture held by said conductive substrate and containing a hydrogen-absorbing alloy;

• wherein said conductive substrate of either one or both of positive and negative electrodes comprises a porous two-dimensional substrate having a thickness of 60 .mu.m or less which is obtained by molding metal powder by way of powder rolling method, and two three-dimensional substrates superimposed respectively on the opposed surfaces of said porous two-dimensional substrate.