Sanyo Electric Co., Ltd.

Yoshifumi Magari

Shigekazu Yasuoka

Jun Ishida

Tadayoshi Tanaka

Toshiyuki Nohma

Katsuhiko Shinyama

Kazuaki Tamura

Atsutoshi Ako

Akira Nishida

Takeshi Ogasawara

Mamoru Kimoto

Nobuyuki Higashiyama

Atsuhiro Funahashi

Yasuhiko Itoh

Hiroyuki Akita

Tomoyuki Yamada

Kentaro Tsukamoto

Ikuo Yonezu

Mutsumi Yano

Masaru Kihara

Toshiki Sato

Akira Saguchi

Tetsuyuki Murata

Yasuyuki Harada

A secondary battery provided with: a belt-like positive electrode plate having a plurality of positive electrode tabs; and a positive electrode current collector which is connected so that the plurality of positive electrode tabs are stacked, wherein the positive electrode plate has a positive electrode core body and a positive electrode active material layer formed on the positive electrode core bodies. At one edge side of the positive electrode plate where the plurality of positive electrode tabs are provided, one surface of the positive electrode core body has formed thereon a first protrusion that protrudes from said surface of the positive electrode core body in the thickness direction of the positive electrode core body, whereas the other surface of the positive electrode core body has no protrusion formed to protrude from said other surface of the positive electrode core body in the thickness direction of the positive electrode core body.

Secondary battery

A positive electrode plate that has a positive electrode active material layer formed on a positive electrode core, wherein the positive electrode core has, on an edge side, a thick portion which has a thickness that is greater than the thickness of a portion of the positive electrode core that has the positive electrode active material layer formed on both sides, and the positive electrode plate has a first region that extends into the thick portion from the portion of the positive electrode core that has the positive electrode active material layer formed on both sides and a second region that is positioned outside the first region in the thick portion. The average maximum diameter of the metal crystal grains that compose the first region is smaller than those of the second region.

Electrode plate and method for manufacturing same, and secondary battery and method for manufacturing same

The nonaqueous electrolyte secondary battery according to one embodiment includes a flat wound electrode body in which a positive plate and a negative plate are wound via a separator and characterized in that the positive plate has a positive core and a positive mixed material layer that is formed on both sides of the positive core, the positive mixed material layer includes a lithium metal composite oxide represented by general formula Li1+xMaO2+b (in the formula, x, a, and b satisfy the conditions x+a=1, −0.2<x≤0.2, and −0.1≤b≤0.1, and M includes Ni and Co and at least one element selected from the group consisting of Mn and Al), and the positive plate has a flexibility index of 15 to 19. Such a positive plate is capable of having a high packing density while suppressing cracks in the positive mixed material layer and buckling of the positive plate and the negative plate.

Method for manufacturing nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery

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

Negative electrode for alkaline storage battery, fabrication method thereof, and alkaline storage battery

An alkaline storage battery has a negative electrode using a hydrogen-absorbing alloy represented by a general formula LnMgNiAwherein Ln is at least one element selected from rare-earth elements including Y, Ca, Zr, and Ti, A is at least one element selected from Co, Fe, Mn, V, Cr, Nb, Al, Ga, Zn, Sn, Cu, Si, P and B, and 0.15&#x2266;x&#x2266;0.30, 0&#x3c;z&#x2266;1.5, and 2.8&#x2266;y+z&#x2266;4.0 are satisfied. The hydrogen-absorbing alloy has a hexagonal system crystal structure or a rhombohedral system crystal structure as its main phase and has a subphase of line which average number of not less than 50 nm in thickness existing in the range of 10 &#x3bc;m&#xd7;10 &#x3bc;m in the cross section of the main phase is 3 or less.

Hydrogen-absorbing alloy, fabrication method thereof and alkaline storage battery

A hydrogen-absorbing alloy for alkaline storage battery which is produced by a rapid cool using a rapid quenching method and whose component is represented by a general formula LnMgNiAlZis used for a negative electrode of an alkaline storage battery.

Method of making hydrogen-absorbing alloy for alkaline storage battery, and alkaline storage battery

A hydrogen absorbing alloy is provided that is represented by the general formula LnMgNiA, where: Ln is at least one element selected from the group consisting of Ca, Zr, Ti, and rare-earth elements including Y; A is at least one element selected from the group consisting of Co, Mn, V, Cr, Nb, Al, Ga, Zn, Sn, Cu, Si, P, and B; and x, y, and z satisfy the following conditions 0.05&#x2266;x&#x2266;0.25, 0&#x3c;z&#x2266;1.5, and 2.8&#x2266;y+z&#x2266;4.0, wherein Ln contains 20 mole % or more of Sm.

Hydrogen-absorbing alloy and nickel-metal hydride storage battery

Low temperature discharge capability and high rate discharge capability are improved in an alkaline storage battery that uses as its negative electrode a hydrogen-absorbing alloy electrode employing hydrogen-absorbing alloy particles containing at least nickel and a rare-earth element. An alkaline storage battery uses as the negative electrode a hydrogen-absorbing alloy electrode employing hydrogen-absorbing alloy particles containing at least nickel and a rare-earth element. The hydrogen-absorbing alloy particles have a surface layer and an interior portion, the surface layer having a nickel content greater than that of the interior portion, and nickel particles having a particle size within a range of from 10 nm to 50 nm are present in the surface layer.

Hydrogen-absorbing alloy electrode, alkaline storage battery, and method of manufacturing the alkaline storage battery

A hydrogen-absorbing alloy for a negative electrode in an alkaline storage battery includes a first hydrogen-absorbing alloy and a second first hydrogen-absorbing alloy. The first hydrogen-absorbing alloy contains at least a rare-earth element, Mg, Ni, and Al, and has an intensity ratio I/Iof 0.1 or greater in X-ray diffraction analysis using Cu&#x2014;K&#x3b1; radiation as an X-ray source, where Iis the strongest peak intensity that appears in the range of 2&#x3b8;=31&#xb0; to 33&#xb0;, and Iis the strongest peak intensity that appears in the range of 2&#x3b8;=40&#xb0; to 44&#xb0;. The second hydrogen-absorbing alloy has a Co content greater than that of the first hydrogen-absorbing alloy.

Hydrogen-absorbing alloy electrode and alkaline storage battery

A separator for a nickel-metal hydride storage battery having a hydrogen-absorbing alloy as a negative electrode. The separator is a laminate of a substrate and a porous hydrophilic film.

Separator for nickel-metal hydride storage battery and nickel-metal hydride storage battery

A nickel-metal hydride storage battery comprising a positive electrode containing nickel hydroxide, a negative electrode containing a hydrogen absorbing alloy and an alkaline electrolyte, wherein the positive electrode contains a hydroxide and/or an oxide of an element selected from the group consisting of calcium, strontium, scandium, yttrium, lanthanoid and bismuth, and the negative electrode contains germanium.

Nickel-metal hydride storage battery

A nickel-metal hydride storage battery which includes a positive electrode containing nickel hydroxide, a negative electrode containing a hydrogen absorbing alloy and an alkaline electrolyte, wherein the positive electrode contains a hydroxide and/or an oxide of an element selected from the group consisting of calcium, strontium, scandium, yttrium, lanthanoid and bismuth, and the negative electrode contains a hydroxide and/or an oxide of at least one element selected from the group consisting of scandium, yttrium and lanthanoid.

A non-sintered nickel electrode for an alkaline storage battery, characterized in that nickel hydroxide particles as active material particles thereof contain a cobalt having a valence of 3 to 3.2 as a solid solution element. The nickel electrode has excellent charging capability.

Non-sintered nickel electrode for alkaline storage battery

The sealed alkaline storage battery of this invention includes a nonsintered nickel positive electrode using, as an active material, manganese-containing &agr;-nickel hydroxide including, as a solid-solution element, 15 through 50 wt % of manganese on the basis of a total amount of nickel and manganese; a negative electrode; and an alkaline electrolyte including 0.55 through 0.80 g of water per gram of the manganese-containing &agr;-nickel hydroxide. In this manner, the invention provides an alkaline storage battery exhibiting high positive electrode active material utilization for a large number of charge-discharge cycles.

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Kobe, Japan

Yoshifumi Magari