Divalent silver oxide for use in primary cell and manufacturing method thereof
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKaoru Murakami, Mitsugu Okahisa, Tomohiko Arita, Hiroshi Kumano
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.
Claims15
A method for manufacturing a stable silver oxide for use in a primary cell which consists essentially of the steps of:
- (a) reacting in aqueous solution at a temperature of 0.degree. to 60.degree. C. at least one member selected from the group consisting of silver salts and silver oxide (Ag.sub.2 O), persulfate and alkaline metal hydroxide to produce silver-II oxide, said persulfate being used in amount 1.0 to 1.85 times the theoretical amount thereof, with its concentration in aqueous solution being in the range from 0.04 to 0.72 mol/l, and said alkaline metal hydroxide being used in amount 1.05 to 6.0 times the theoretical amount thereof, with its concentration in aqueous solution being in the range from 0.3 to 4.8 mol/l and
- (b) water washing and drying said divalent silver oxide thus produced.
Dependencies are inferred from the claim text.