Divalent silver oxide for use in primary cell and manufacturing method thereof
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKaoru Murakami, Mitsugu Okahisa, Tomohiko Arita, Kumano, Hiroshi
Life of this patent
Estimating the term…
Abstract
The present invention relates to a divalent silver oxide for use in primary cells which is stable in an alkaline solution, slow in the speed of oxygen gas generation with favorable reproducibility and has X-ray diffraction peak values different from that of conventional divalent silver oxide and the method of manufacturing the divalent silver oxide of the above described type. By the employment of the divalent silver oxide according to the present invention, it is possible to produce, at low cost, batteries having high energy density per unit weight and volume, with small amount of gas generation to prevent swelling or expansion of the cells.
Claims3
A silver-II oxide cell having a negative electrode comprising zinc and a positive electrode comprising silver-II oxide, said silver-II oxide being produced by reacting at least one member selected from the group consisting of silver salts and Ag.sub.2 O, a persulfate and an alkaline metal hydroxide, said silver-II oxide having an X-ray diffraction spectrum with a peak value relative intensity higher than 100 at face (200) (face interval d=2.79.sub.1 A) and at face (111) (face interval d=2.76.sub.7 A) and having a peak value relative intensity higher than 10 at face (313) (face interval d=1.39.sub.4 A) and at face (400) (face interval d=1.39.sub.5 A) on the assumption that peak value intensity at face (111) (face interval d=2.41.sub.3 A) is 100 and said silver-II oxide having degree of oxidation within the range from 96 to 100%, with particle surface area thereof being smaller than 0.5 m.sup.2 /g.
Dependencies are inferred from the claim text.