| US 7,476,466 B2 | ||
| Alkaline dry battery with a nickel oxyhydroxide and manganese oxide positive electrode including a calcium compound | ||
| Hidekatsu Izumi, Osaka (Japan); Tadaya Okada, Osaka (Japan); Yasuo Mukai, Osaka (Japan); Michiko Fujiwara, Osaka (Japan); and Shigeto Noya, Osaka (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Appl. No. 11/885,663 PCT Filed Sep. 22, 2006, PCT No. PCT/JP2006/318883 § 371(c)(1), (2), (4) Date Sep. 05, 2007, PCT Pub. No. WO2007/037181, PCT Pub. Date Apr. 05, 2007. |
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| Claims priority of application No. 2005-279704 (JP), filed on Sep. 27, 2005. | ||
| Prior Publication US 2008/0138711 A1, Jun. 12, 2008 | ||
| Int. Cl. H01M 4/42 (2006.01); H01M 4/52 (2006.01); H01M 4/50 (2006.01) | ||
| U.S. Cl. 429—229 [429/223; 429/224] | 3 Claims |
| 1. An alkaline dry battery comprising:
a positive electrode including a positive electrode active material comprising a nickel oxyhydroxide powder and a manganese
dioxide powder, a conductive agent comprising graphite, and a calcium compound; and
a negative electrode including a negative electrode active material comprising a zinc or zinc alloy powder, a gelling agent,
and an aqueous solution of potassium hydroxide, wherein
the positive electrode includes a calcium compound having a content of iron element of 150 ppm or less in an amount of 0.1
to 10 mol % with respect to the positive electrode active material,
the nickel oxyhydroxide powder has an average nickel valence of 2.95 or more and an average particle diameter of 8 to 18 μm,
the weight ratio of the nickel oxyhydroxide powder and the manganese dioxide powder is 20:80 to 90:10,
the zinc or zinc alloy powder includes a first powder having a particle diameter more than 75 μm and 425 μm or less, and a
second powder having a particle diameter more than 5 μm and 75 μm or less, the weight ratio of the first powder and the second
powder is 65:35 to 75:25, and
the concentration of the aqueous solution of potassium hydroxide is 33 to 35% by weight.
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