Kabushiki Kaisha Toshiba

Other

Hiroshi Kitayama

Shusuke Inada

Masaaki Yamamoto

Hirotaka Hayashida

Hideki Yoshida

Motoya Kanda

Isao Sakai

Takamichi Inaba

Takao Sawa

Tatsuoki Kohno

Tatsuoki Kono

Fumiyuki Kawashima

Shirou Takeno

Akira Yajima

Masahiro Sekino

Asako Satoh

Masayuki Oguchi

Nao Shimura

Kunihiko Miyamoto

Hideharu Suzuki

Naomi Bando

A nonaqueous electrolyte secondary battery includes an electrode group having a positive electrode and a negative electrode wound flatly by way of an interposed separator, a positive electrode tab electrically connected to the positive electrode, and projecting from a spiral winding surface of the electrode group, a negative electrode tab electrically connected to the negative electrode, and projecting from the spiral winding surface, and a nonaqueous electrolyte, wherein the nonaqueous solvent contains sultone compound including a ring having at least one double bond, and a distance between the positive electrode tab and the negative electrode tab is 6 mm to 18 mm.

Nonaqueous electrolyte secondary battery

The present invention provides a hydrogen absorbing alloy containing as a principal phase at least one phase selected from the group consisting of a second phase having a rhombohedral crystal structure and a first phase having a crystal structure of a hexagonal system excluding a phase having a CaCutype structure, wherein a content of a phase having a crystal structure of ABtype is not higher than 10% by volume including 0% by volume and the hydrogen absorbing alloy has a composition represented by general formula (1) given below:RMgTNiM1M2Mn&#x2003;&#x2003;(1).

Hydrogen absorbing alloy and secondary battery

The present invention provides a hydrogen absorbing alloy containing as a principal phase at least one phase selected from the group consisting of a second phase having a rhombohedral crystal structure and a first phase having a crystal structure of a hexagonal system excluding a phase having a CaCutype structure, wherein a content of a phase having a crystal structure of ABtype is not higher than 10% by volume including 0% by volume and the hydrogen absorbing alloy has a composition represented by general formula (1) given below:MgTNiM1M2Mn.&#x2003;&#x2003;(1)

The present invention provides a hydrogen absorbing alloy containing as a principal phase at least one phase selected from the group consisting of a second phase having a rhombohedral crystal structure and a first phase having a crystal structure of a hexagonal system excluding a phase having a CaCutype structure, wherein a content of a phase having a crystal structure of ABtype is not higher than 10% by volume including 0% by volume and the hydrogen absorbing alloy has a composition represented by general formula (1) given below:RMgTNiM1M2Mn. &#x2003;&#x2003;(1)

Hydrogen-absorbing alloy, secondary battery, hybrid car and electromobile

A nickel-metal hydride secondary battery comprising electrode group comprising positive electrode comprised mainly of nickel hydroxide, negative electrode comprised mainly of a hydrogen storage alloy, and separator being disposed between the positive electrode and the negative electrode, wherein the electrode group is sealed in battery casing, together with an alkali electrolyte liquid, wherein, in the battery, a W element and an Na element are present simultaneously. The nickel-metal hydride secondary battery of the present invention is advantageous not only in that it exhibits high utilization of the active material and excellent self-discharge characteristics in a high temperature storage as well as high charging efficiency in a high temperature environment, but also in that it has excellent large current discharge characteristics.

Nickel-metal hydride secondary battery

Hydrogen-absorbing alloy and secondary battery

Nickel-hydrogen secondary battery

A nickel-hydrogen secondary battery having a negative electrode comprising a hydrogen-absorbing alloy containing magnesium, a rare earth element and nickel as essential elements, which is capable of suppressing the self-discharge being occurred under the condition of high temperature storage, or the like. This secondary battery comprises a negative electrode containing a hydrogen-absorbing alloy, a positive electrode containing nickel hydroxide, a separator comprising a non-woven fabric, and an alkaline electrolyte. The hydrogen-absorbing alloy is represented by (R,Mg,)Ni,A,(wherein R is at least one element selected from rare earth elements (including yttrium), Ca, Zr and Ti, A is at least one element selected from Co, Mn, Fe, V, Cr, Nb, Al, Ga, Zn, Sn, Cu, Si, P and B), and x, y and z are atomic ratio individually defined as 0<x<1, 0&lE;z&lE;1.5, 2.5&lE;y&plus;z<4.5). The ratio between the weight of the hydrogen-absorbing alloy per unit area of the negative electrode (M,(mg/cm,)) and the weight per unit area of the separator (M,(g/m,)) meets the condition of M,/M,&lE;6.

There is provided a hydrogen-absorbing alloy which contains an alloy ingot manufactured by means of a casting or sintering method or a pulverized product of the alloy ingot, and the alloy ingot being represented by the following general formula (1),

Hydrogen-absorbing alloy

Growing community of inventors

Fujisawa, Japan

Hiroshi Kitayama