Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Hideaki Ohyama

Fumio Kato

Yoshitaka Dansui

Kiyoshi Hayashi

Shinichi Sumiyama

Akiko Okabe

Kyoko Nakatsuji

Yasushi Nakamura

Harunari Shimamura

Yasuhiko Bito

Toshitada Sato

Hiroki Takeshima

Kazutaka Ikeda

Shinichi Orimo

Takashi Kasahara

Kenta Tsutsui

Susumu Kikuyama

Yuko Nakamori

Hai-Wen Li

Provided is an electrode alloy powder that is useful to obtain a nickel-metal hydride storage battery having a high battery capacity and a reduced self-discharge. The alloy powder is: a mixture including particles of a first hydrogen storage alloy having an AB-type crystal structure, and particles of at least one second hydrogen storage alloy selected from the group consisting of a hydrogen storage alloy a having an AB-type crystal structure and a hydrogen storage alloy b having an AB-type crystal structure, wherein an amount of the first hydrogen storage alloy included in the mixture is greater than 50 mass %.

Electrode alloy powder, negative electrode for nickel-metal hydride storage batteries using the same, and nickel-metal hydride storage battery

Disclosed is an alloy powder for electrodes for nickel-metal hydride storage batteries having a high battery capacity and being excellent in life characteristics and high-temperature storage characteristics. The alloy powder includes a hydrogen storage alloy containing elements L, M, Ni, Co, and E. L includes La as an essential component. L includes no Nd, or when including Nd, the percentage of Nd in L is less than 5 mass %. The percentage of La in the hydrogen storage alloy is 23 mass % or less. M is Mg, Ca, Sr and/or Ba. A molar ratio &#x3b1; to a total of L and M is 0.045&#x2264;&#x3b1;&#x2264;0.133. A molar ratio x of Ni to the total of L and M is 3.5&#x2264;x&#x2264;4.32, and a molar ratio y of Co is 0.13&#x2264;y&#x2264;0.5. The molar ratios x and y, and a molar ratio z of E to the total of L and M satisfy 4.78&#x2264;x+y+z&#x3c;5.03.

Alloy powder for electrodes, negative electrode for nickel-metal hydride storage batteries including the same, and nickel-metal hydride storage battery including the same

Provided is an alloy powder for an electrode which enables an alkaline storage battery to have both excellent discharge characteristics and excellent life characteristics. The alloy powder includes a hydrogen storage alloy including an element L, Mg, Ni, Al, and an element M. The element L is at least one selected from the group consisting of group 3 elements and group 4 elements of the periodic table (excluding Y). The element Mis at least two selected from the group consisting of Ge, Y, and Sn. A molar proportion x of Mg in a total of the element L and Mg is 0.008&#x2266;x&#x2266;0.54. A molar proportion y of Ni, a molar proportion &#x3b1; of Al, and a molar proportion &#x3b2; of the element M, per the foregoing total is 1.6&#x2266;y&#x2266;4, 0.008&#x2266;&#x3b1;&#x2266;0.32, and 0.01&#x2266;&#x3b2;&#x2266;0.12, respectively.

Alloy powder for electrode, negative electrode for alkaline storage battery using the same, and alkaline storage battery

An alkaline storage battery includes: a cylindrical case having a side wall including an opening end portion and a bottom; a sealing plate; a gasket interposed between the sealing plate and the opening end portion; and a sealant between the gasket and the opening end portion. The side wall has an annular groove opened at an outer surface thereof, and an inwardly curl portion at the opening end portion. In at least part of the groove, the minimum width L1 is within 0.2 mm. The sealant includes a polyamide resin formed such that when two test-plate materials are bonded together at bonding faces facing each other via a bonding portion of the sealant, and moved in parallel with the bonding faces and in opposite directions to have a relative displacement within 0.5 to 5 mm, a stress at least 0.02 N/mmis applied to the bonding portion.

Cylindrical alkaline storage battery

A charge/discharge control method for an alkaline storage battery () includes: obtaining in advance a coefficient (K) representing characteristics of a memory effect of the alkaline storage battery; causing the alkaline storage battery to perform a charge/discharge between a lower-limit depth-of-charge (SOCb), of which a depth-of-charge is set within a range of 10% to 30%, and an upper-limit depth-of-charge (S), of which a depth-of-charge is set within a range of 70% to 90%; calculating an additional charge electricity quantity (C) based on the coefficient (K), the upper-limit depth-of-charge (S), and a predetermined reference time (T); measuring a charging/discharging time during which the alkaline storage battery performs the charge/discharge; and performing a charge of the alkaline storage battery with the calculated additional charge electricity quantity added to the upper-limit depth-of-charge, each time when the measured charging/discharging time reaches the reference time.

Charge/discharge control method for alkaline storage battery, and power supply system

A negative electrode active material for a nickel-metal hydride battery of the present invention includes a hydrogen storage alloy, the hydrogen storage alloy containing La, Mg, Ni, Co, Al, and element M. The molar ratio y of Ni to the total of La and Mg is 2&#x2266;y&#x2266;3, the molar ratio z of Co to the total of La and Mg is 0.25&#x2266;z&#x2266;0.75, the molar ratio &#x3b1; of Al to the total of La and Mg is 0.01&#x2266;&#x3b1;&#x2266;0.05, and the molar ratio x of Mg to the total of La and Mg is 0.01&#x2266;x&#x2266;0.5. Element M represents at least one selected from the group consisting of Y and Sn, and the content of element M in the hydrogen storage alloy is 0.4 wt % or less.

Negative electrode active material for nickel-metal hydride battery and nickel-metal hydride battery using the same, and method for treating negative electrode active material for nickel-metal hydride battery

A negative electrode material for a nickel-metal hydride battery containing a hydrogen-absorbing alloy represented by a general formula: MmTNiAlMnCoT, in which: Mm is at least one of light rare earth elements; Tis at least one selected from the group consisting of Mg, Ca, Sr and Ba; Tis at least one selected from the group consisting of Sn, Cu and Fe; and 0.015&#x2266;a&#x2266;0.5, 2.5&#x2266;x&#x2266;4.5, 0.05&#x2266;y+z&#x2266;2, 0&#x2266;b&#x2266;0.6, 0&#x2266;c&#x2266;0.6 and 5.6&#x2266;x+y+z+b+c&#x2266;6 are satisfied.

Negative electrode material for nickel-metal hydride battery and treatment method thereof, and nickel-metal hydride battery

An electrode alloy powder includes a hydrogen storage alloy and magnetic material clusters. The hydrogen storage alloy contains 20 to 70 wt % of Ni. The magnetic material clusters contain metal nickel, and have an average cluster size of 8 to 10 nm. A method for producing the electrode alloy powder includes an activation step of allowing a raw material powder including a hydrogen storage alloy to be in contact with an aqueous solution containing A wt % of sodium hydroxide and held at 100&#xb0; C. or greater for B minutes. A and B satisfy 2410&#x2266;A&#xd7;B&#x2266;2800.

Alloy powder for electrode and method for producing same

A nonaqueous electrolyte secondary battery with excellent charging/discharging cycle characteristics is provided, more specifically a nonaqueous electrolyte secondary battery in which deterioration of the conductivity of a negative electrode due to charging/discharging cycle is suppressed and a method for manufacturing the same are provided. The nonaqueous electrolyte secondary battery includes: a positive electrode and a negative electrode that are capable of reversibly absorbing and desorbing Li ions; and a nonaqueous electrolyte having lithium ion conductivity. The negative electrode includes a collector and active material particles that are disposed on a surface of the collector. The active material particles include Si and at least one element R selected from the group consisting of Sn, In, Ga, Pb and Bi. Metallic bond including the element R is formed between the active material particles.

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Osaka, Japan

Hideaki Ohyama