Fdk Corporation

Fdk Twicell Co., Ltd.

Sanyo Electric Co., Ltd.

Fdk Corporatin

Akira Saguchi

Masaru Kihara

Jun Ishida

Shota Ohata

Toshiki Sato

Yuki Ehara

Takahiro Endo

Takeshi Ito

Shigekazu Yasuoka

Yoshifumi Magari

Tadayoshi Tanaka

Takuya Kai

Yuzo Imoto

Takeshi Kajiwara

Masaaki Takei

Satoshi Wada

Isao Mugima

Tomomi Nakamura

Yusuke Shingai

Masanori Tamura

Hideyuki Asanuma

A hydrogen absorbing alloy negative electrode is provided. The hydrogen absorbing alloy negative electrode has a hydrogen absorbing alloy, and an additive including yttrium fluoride. A mass of the yttrium fluoride is 0.1 parts by mass or more and 0.2 parts by mass or less based on a hydrogen absorbing alloy powder of 100 parts by mass.

Hydrogen absorbing alloy negative electrode and nickel-hydrogen secondary battery including the hydrogen absorbing alloy negative electrode

A negative electrode for an alkaline storage battery that achieves both an improvement in cycle life and an improvement in low temperature discharge characteristics, and an alkaline storage battery including the negative electrode are disclosed. The negative electrode for an alkaline storage battery includes a negative electrode core body formed of metal, and a negative electrode mixture layer which contains at least a hydrogen storage alloy and yttrium fluoride, and is carried on the negative electrode core body. Particles of the yttrium fluoride are formed so that the average particle size thereof is equal to 1 μm or more and 7 μm or less.

Negative electrode for alkaline storage battery and alkaline storage battery including the negative electrode

A nickel metal hydride secondary battery comprises an outer can and an electrode assembly housed in the outer can together with an alkaline electrolytic solution, wherein the electrode assembly is such that a positive electrode including a positive electrode mixture and a negative electrode including a negative electrode mixture are superimposed with a separator interposed therebetween, the positive electrode mixture includes nickel hydroxide forming a solid solution with zinc as a positive electrode active material and zinc oxide as a positive electrode additive, the negative electrode mixture includes hydrogen absorbing alloy particles and a negative electrode additive, the negative electrode additive is a composite in which yttrium fluoride is supported on carbon black, and a surface of the hydrogen absorbing alloy particles is partially coated with the composite.

Nickel metal hydride secondary battery

An electrode has a band-shaped core and an electrode mixture layer carried by the core to form a spiral electrode assembly with a gas generating electrode and a separator for an alkaline secondary battery. The electrode in the spiral shape has a first circumference portion, an intermediate portion, and an outermost circumference portion. The first circumference portion is a starting portion for winding into the spiral shape. The intermediate portion is a second and following circumferences of the spiral shape. The outermost circumference portion has an inner surface only which faces the gas generating electrode. The electrode mixture layer includes a reactant that develops a reaction consuming gas generated from the gas generating electrode. An amount of the reactant in the first circumference portion is more than those in the intermediate portion and/or the outermost circumference portion.

Electrode for alkaline secondary battery and alkaline secondary battery

An alkaline storage battery includes a spiral electrode group in which a positive electrode plate, a negative electrode plate, and a separator arranged between the positive electrode plate and the negative electrode plate are laminated, the negative electrode plate is located on the inner peripheral side of the positive electrode plate at an innermost peripheral portion, and an electrically conductive outer packaging can in which the spiral electrode group is accommodated together with an alkaline electrolytic solution. The negative electrode plate includes a negative electrode core body, a first negative electrode mixture layer carried on a surface on the outer peripheral side of the negative electrode core body, and a second negative electrode mixture layer carried on a surface on the inner peripheral side of the negative electrode core body. The negative electrode core body has a burr protruding toward the outer peripheral side at an edge portion of an innermost peripheral portion of the negative electrode core body. The thickness of the edge portion of an innermost peripheral portion of the first negative electrode mixture layer is smaller than the thickness of a portion other than the edge portion of the first negative electrode mixture layer. The height of the burr is 30% or less of the thickness of the separator.

Alkaline storage battery and method for manufacturing the alkaline storage battery

A negative electrode used in a nickel metal hydride secondary battery includes a negative electrode core body and a negative electrode mixture carried on the negative electrode core body. The negative electrode mixture includes hydrogen storage alloy powder which is an aggregate of hydrogen storage alloy particles, a binder, and a thickener. The hydrogen storage alloy particles have a volume mean particle size of 40 &#x3bc;m or less and a concentration of chlorine of not less than 180 ppm to not more than 780 ppm.

Negative electrode for nickel metal hydride secondary battery, method of manufacturing the negative electrode, and nickel metal hydride secondary battery using the negative electrode

A battery comprises an electrode group including a separator, a positive electrode and a negative electrode. The negative electrode comprises a negative electrode core, negative electrode mixture layers retained to the negative electrode core, and a fluorine resin layer disposed on the surface of the negative electrode mixture layers. The negative electrode mixture layers include a first outermost peripheral region located at the outermost periphery of the electrode group and a second outermost peripheral region located opposite to the first outermost peripheral region. When the amount of the fluorine resin constituting a first fluorine resin layer in a portion of the first outermost peripheral region is represented by A, and the amount of the fluorine resin constituting a second fluorine resin layer in a portion of the second outermost peripheral region is represented by B, a relation A&#x3e;B is satisfied.

Negative electrode for alkaline secondary battery, and alkaline secondary battery

A nickel-hydrogen secondary battery includes an electrode group which contains a positive electrode, a negative electrode, and a separator, wherein the negative electrode includes a negative electrode core, and a negative electrode mixture layer held by the negative electrode core, wherein the negative electrode mixture layer contains a fluororesin; a quantity of the fluororesin, expressed by a mass applied per unit area of the negative electrode, is within a range of 0.2 mg/cmor more and 2.0 mg/cmor less; and a fluororesin content which is a ratio of the fluororesin contained in a unit volume of the negative electrode mixture layer is higher in an inner layer portion than in an outer layer portion in the negative electrode mixture layer.

Negative electrode for nickel-hydrogen secondary battery, and nickel-hydrogen secondary battery

A nickel hydrogen secondary battery accommodates an electrode group including a positive electrode and a negative electrode which are stacked one on top of another through a separator, together with an alkaline electrolyte. The battery contains Li, with a total amount of Li in the batteryof 15 to 50 mg/Ah, as determined as the mass in terms of LiOH per Ah of the positive electrode capacity. The negative electrode includes particles of rare earth-Mg&#x2014;Ni-based hydrogen storage alloy which contains a rare earth element, Mg and Ni. The hydrogen storage alloy particlesincludes, on the surface thereof, a rare earth hydroxide which is the hydroxide of a rare earth element and has a specific surface area of 0.1 to 0.5 m/g.

Nickel hydrogen secondary battery

A nickel hydride secondary battery houses an electrode group including a positive electrode and a negative electrode which are overlapped with each other via a separator with an alkaline electrolyte solution, the negative electrode includes a hydrogen absorbing alloy, a negative-electrode additive agent, a thickening agent, and a conductive material, and the negative-electrode additive agent includes at least one selected from calcium fluoride, calcium sulfide, and calcium chloride.

Nickel hydride secondary battery

A negative electrode for a nickel-hydrogen rechargeable battery is a strip-shaped negative electrode, the negative electrode being formed of a core body and a negative mixture layer covering the core body and containing hydrogen-storage alloy particles, including a main section, both sides of which face the positive electrode with the separator intervening therebetween as viewed in a rolled state where the negative electrode forms the electrode group with the positive electrode and the separator, and an outermost circumferential portion and an innermost circumferential portion that are protruding from ends of the main section in a rolling direction and facing the positive electrode with the separator intervening therebetween only with one side, wherein the hydrogen-storage alloy particles contained in the outermost circumferential portion and the innermost circumferential portion have an average diameter larger than an average diameter of the hydrogen-storage alloy particles contained in the main section.

Negative electrode for a nickel-hydrogen rechargeable battery and a nickel-hydrogen rechargeable battery using the same

An alkaline secondary cell has an electrode assembly including a positive electrode, a negative electrode and a separator, and alkaline electrolyte. The negative electrode includes hydrogen-storage alloy and an oxidation inhibitor that inhibits the hydrogen-storage alloy from being oxidized. The oxidation inhibitor contains a chemical compound, and the chemical compound includes a chemical-bond-formation end that is chemically bonded to the surface of the hydrogen-storage alloy and a water-repellent end having water repellency.

Negative electrode for alkaline secondary cell and alkaline secondary cell using same

A negative electrode for alkaline storage battery using a hydrogen-absorbing alloy includes fluorinated oil and a surface active agent.

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Takasaki, Japan

Akira Saguchi