| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an alkali storage battery with high recharging efficiency reduced in the generation of oxygen even at a high temperature when charged. <P>SOLUTION: An alkali storage battery using a power generation element composed of a positive electrode comprising a nickel (Ni) oxide as a main material, a negative electrode, a separator and an alkali aqueous solution, wherein a material of the positive electrode is spherical powder 19 whose tapping density is not less than 2.2 g/cc mainly composed of a nickel hydroxide (Ni(OH)<SB>2</SB>), powder 19 comprises core powder 16 with a innumerable microscopic concave and a convexes on the surface mainly composed of spherical β-type Ni(OH)<SB>2</SB>and fine powder 22 composed of metal cobalt (Co) and/or a Co oxide, and the fine powder 22 is crushed and pressed substantially into all concaves of microscopic concaves and convexes 23 of the core powder 16, thereby being integrated with the core powder 16, and the surface layer of the powder 19 is coated with the fine powder 22 and fluttered, and the core powder 16 and/or the fine powder 22 have innumerable micro pores 18 which penetrate from surfaces to inner portions. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
