Sanyo Electric Co., Ltd.

Sanyo Electronic Co., Ltd.

Mitsunori Tokuda

Mutsumi Yano

Shin Fujitani

Koji Nishio

Takeshi Ogasawara

Mitsuzou Nogami

Ikuo Yonezu

Mamoru Kimoto

Yuki Morikawa

Syuichi Suzuki

Nobuyuki Higashiyama

Mitsuzo Nogami

Yasuhiko Itoh

Kousuke Satoguchi

Masao Inoue

Hiroshi Nakamura

Makoto Ochi

Yoshinori Matsuura

Katsuhiko Shinyama

Koichi Nishimura

Kazuhiro Kitaoka

Masao Takee

Reizo Maeda

Takahiro Isono

Kazuki Hamasaki

[Problem] To suppress increases in the resistance of nickel positive electrodes and assure sufficient battery capacity even after repeated pulse charging and discharging cycles with a large current. [Solution] This alkaline storage battery () contains aluminum (Al) in a hydrogen storage alloy negative electrode () and also includes Al in a nickel positive electrode (). In a state where a prescribed charging and discharging cycle has completed, the Al content in the nickel positive electrode () is 0.25% by mass or greater of that in the positive electrode active material, and in powder x-ray diffraction of the positive electrode active material using Cu&#x2014;K&#x3b1;, the half-width of the (101) plane peak for Ni(OH)is controlled so as to be 0.5 (&#xb0;/2&#x3b8;) or greater.

Alkaline storage battery

In a sintered nickel electrode for alkaline storage battery formed by filling nickel hydroxide as an active material into a porous sintered substrate and an alkaline storage battery using as its positive electrode the sintered nickel electrode for alkaline storage battery, tungstic acid is adhered to a surface of said nickel hydroxide as an active material.

Sintered nickel electrode for alkaline storage battery, method of forming the same, and alkaline storage battery

The nickel electrode for alkaline secondary battery according to the present invention is obtained by applying a paste containing active material particles comprising nickel hydroxide to a conductive substrate and drying the paste on the conductive substrate. In the above-mentioned nickel electrode for alkaline secondary battery, a conductive layer comprising sodium-containing cobalt oxide is formed on a surface of the active material particles and tungsten powder and/or tungsten compound powder is added on the active material particles.

Nickel electrode for alkaline secondary battery and alkaline secondary battery

A nickel electrode for alkaline storage battery according to the present invention is formed by applying a paste containing active material particles composed of nickel hydroxide to a conductive substrate and drying said paste, wherein a conductive layer consisting of sodium-containing cobalt oxide is formed on a surface of said active material particles, and titanium powder and/or titanium compound powder is added to the surface of said active material particles, and an alkaline storage battery according to the present invention uses as its positive electrode the above-mentioned nickel electrode for alkaline storage battery.

Nickel electrode for alkaline storage battery and alkaline storage battery

A nickel hydroxide electrode for an alkaline storage battery comprises titanium hydroxide formed on the surface of nickel hydroxide as a main active material impregnated into pores of a porous sintered substrate. An alkaline storage battery comprises a negative electrode and the nickel hydroxide electrode as a positive electrode. The alkaline storage battery provides a high discharge capacity even if the battery is charged under a high temperature atmosphere.

Nickel hydroxide electrode for alkaline storage battery and alkaline storage battery

A nickel electrode for an alkaline storage battery employed as a positive electrode of an alkaline storage battery is formed by filling an active material into pore of a porous sintered substrate wherein said active material is formed by adhering niobic acid to a surface of nickel hydroxide particles.

Nickel electrode for alkaline storage battery, method of fabricating the same, and alkaline storage battery

A nickel electrode for an alkaline storage battery employed as a positive electrode of an alkaline storage battery is formed by applying a paste containing active material particles composed of nickel hydroxide to a conductive substrate and drying said paste, wherein a conductive layer consisting of cobalt oxide containing sodium is formed on a surface of said active material particles, and niobium powder and/or niobium compound powder is added to the surface of said active material particles.

The nickel-metal hydride storage battery of this invention includes a nonsintered nickel electrode using, as a positive electrode active material, nickel hydroxide including, as a solid-solution element, at least one element Q selected from the group consisting of Mn, Al, Y, Yb and Co; and a pasted hydrogen-absorbing alloy electrode using, as a negative electrode active material, a hydrogen-absorbing alloy represented by a composition formula, Ti V Ni M , in which a&plus;b&plus;c&equals;100; 15&lE;a&lE;45; 35&lE;b&lE;75; 5&lE;c&lE;25; 0<d&lE;7; and M is at least one element selected from the group consisting of Cr, Mn, Mo, Nb, Ta, W, La, Ce, Y, Mm, Co, Fe, Cu, Si, Al, B, Zr and Hf, and the ratio in capacity between the nonsintered nickel electrode and the pasted hydrogen-absorbing alloy electrode is 1:1.1 through 1:1.8. As a result, the invention provides a nickel-metal hydride storage battery having large battery capacity and a long cycle life.

Nickel-metal hydride storage battery

A sealed alkaline storage battery using, as a positive electrode active material, nickel oxyhydroxide including Mn as a solid-solution element and having a &ggr; ratio of 65 through 100%; a sealed alkaline storage battery using, as a positive electrode active material, nickel oxyhydroxide including as an additive or coated with a rare earth element and/or a rare earth compound in a ratio measured based on the rare earth element of 0.05 through 5 wt %; and a sealed alkaline storage battery including, as a positive electrode active material, nickel oxyhydroxide having a half-width of a peak in a lattice plane (003) in an X-ray diffraction pattern of 0.8&deg; or more. The pressure within the battery is not largely increased for a long period of charge-discharge cycles, and hence, the electrolyte hardly leaks.

Sealed alkaline storage battery

In a positive electrode active material for alkaline storage batteries according to the present invention, a surface of a nickel hydroxide is coated with a mixed crystal material of at least one type of element selected from aluminum Al, manganese Mn, iron Fe, yttrium Y, ytterbium Yb, erbium Er, and gadolinium Gd and cobalt, the valence of nickel in the nickel hydroxide is in the range of 2.0 to 2.3, and the valence of cobalt in the mixed crystal material exceeds 3.0. The positive electrode active material for alkaline storage batteries is used for a positive electrode for alkaline storage batteries, and the positive electrode for alkaline storage batteries is further used for an alkaline storage battery.

Positive electrode active material for alkaline storage batteries, positive electrode for alkaline storage batteries, and alkaline storage battery

A sealed alkaline-zinc storage battery includes a battery can, a hollow positive electrode disposed within the battery can in electrical contact therewith and containing a positive active material including nickle hydroxide, a negative electrode disposed inwardly of the positive electrode and containing a negative active material including zinc, a separator disposed between the positive and negative electrodes, a negative current collector inserted into the negative electrode, and an alkaline electrolyte filled in the battery can and impregnated into the positive electrode, negative electrode and separator. The positive electrode, negative electrode, separator, negative current collector and electrolyte together account for at least 75% of an internal volume of the battery can. The alkaline electrolyte is in the 30 to 45 mass % concentration range and has a total water content in the range of 0.5 to 0.9 g for each theoretical capacity of the negative electrode expressed as 1 Ah (ampere-hour).

Sealed, alkaline-zinc storage battery

Enclosed alkali storage battery

The present invention is directed to an alkaline secondary battery comprising a positive electrode, a zinc based negative electrode, and an alkaline electrolyte solution, wherein the positive electrode includes a central cavity for receiving the zinc based negative electrode, and the negative electrode includes a central cavity for holding the alkaline electrolyte solution. The battery is arranged such that the positive electrode presents a smaller capacity than the negative electrode at least in an initial charge/discharge period.

Alkaline secondary battery

The invention provides a sealed alkaline-zinc storage battery including a tubular positive electrode containing, as an active material, a material having reversibility in a charge-discharge reaction; a separator; a negative electrode disposed within the tubular positive electrode with the separator sandwiched therebetween; and an alkaline electrolyte, in which the positive electrode has a capacity smaller than a capacity of the negative electrode at least in initial charge-discharge cycles, and the amounts of an uncharged active material and zinc to be packed in the negative electrode in manufacture of the sealed alkaline-zinc storage battery are set so that a theoretical capacity P of the uncharged active material existing in the negative electrode can be 0.3 through 1.8 times as large as a battery capacity in a completely charged state in the initial charge-discharge cycles, and that a theoretical capacity Q of zinc existing in the negative electrode can be 0.6 through 2.5 times as large as the battery capacity in a completely discharged state in the initial charge-discharge cycles. Thus, a sealed alkaline-zinc storage battery with high charge-discharge cycle performance is obtained.

Sealed alkaline-zinc storage battery

A positive-electrode active material for alkaline secondary battery according to the invention has an &agr;-Ni(OH),crystal structure which incorporates therein manganese and a trivalent metal other than manganese.

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Osaka, Japan

Mitsunori Tokuda