Nickel positive electrode for alkaline storage batteries
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKazuhiro Ohta, Yukihiro Okada, Hiromu Matsuda, Yoshinori Toyoguchi
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Abstract
Disclosed is a nickel positive electrode for alkaline storage batteries with superb utilization of nickel hydroxide in an atmosphere from room temperature to high temperature. The positive electrode comprises a nickel hydroxide particle or a nickel hydroxide particle with one or more elements other than Ni incorporated therein, a coating layer which comprises a compound of cobalt having a mean valence over 2 and which coats the nickel hydroxide particle, and a compound of at least one element selected from the group consisting of Ca, Sr, Ba, Cu, Ag, Cd, Y, Yb, Ce, Sm, Gd and Er.
Claims14
A nickel positive electrode for alkaline storage batteries comprising particles of a nickel hydroxide material, a coating layer which comprises a compound of cobalt with a mean valence over 2 and which coats said particles, and a compound of at least one metallic element selected from the group consisting of Ca, Sr, Ba, Cu, Ag, Cd, Y, Yb, Ce, Sm, Gd and Er.
A nickel positive electrode for alkaline storage batteries comprising particles of aggregated crystals of a nickel hydroxide material provided with a coating layer of a compound of cobalt with a mean valence over 2, said particles containing inside and on the surface thereof a compound of at least one metallic element selected from the group consisting of Ca, Sr, Ba, Cu, Ag, Cd, Y, Yb, Ce, Sm, Gd and Er.
A method for producing a nickel positive electrode for alkaline storage batteries comprising a step of:
- heating particles of a nickel hydroxide material with a coating layer of a compound of cobalt with a mean valence over 2, together with a compound of at least one metallic element selected from the group consisting of Ca, Sr, Ba, Cu, Ag, Cd, Y, Yb, Ce, Sm, Gd and Er, in the presence of both oxygen and an alkaline aqueous solution thereby to obtain an active material mixture.
A method for producing a nickel positive electrode for alkaline storage batteries comprising the steps of:
- adding an aqueous solution containing a cobalt ion and an ion of at least one element selected from the group consisting of Ca, Sr, Ba, Cu, Ag, Cd, Y, Yb, Ce, Sm, Gd and Er to an aqueous dispersion of particles of a nickel hydroxide material under a pH condition adjusted with an alkaline aqueous solution to obtain an active material in which said particles of nickel hydroxide material is coated with a coating layer composed of a cobalt compound and a compound of said at least one metallic element, and
- heating said active material in the presence of both oxygen and an alkaline aqueous solution.
Dependencies are inferred from the claim text.