Sanyo Electric Co., Ltd.

Kikuko Kato

Mamoru Kimoto

Teruhiko Imoto

Nobuyuki Higashiyama

Koji Nishio

Shin Fujitani

Yohei Hirota

Masutaka Ouchi

Hiroshi Nonoue

Yasushi Kuroda

Yasuhiko Itoh

Yasuo Nakahara

Ikuo Yonezu

Hiroshi Nakajima

Mutsumi Yano

Takashi Umemoto

Kazuhiro Takatani

Yoshinori Matsuura

Koichi Nishimura

Mitsuzou Nogami

Yasuhiro Kishimoto

Masaaki Nemoto

Tadashi Ise

Seiji Omura

Takuya Hashimoto

Koji Endo

Hiroshi Fukuda

Yoshihiro Masuda

Sachi Niki

The present invention relates to a solid electrolytic capacitor provided with a anode made of a metal or an alloy having valve action, a dielectric layer formed on the anode, and an electrolyte layer consisting of a conductive polymer layer formed so as to have contact with a portion of the region on the dielectric layer surface and a manganese dioxide layer formed so as to have contact with the other portion of the region on the dielectric layer surface.

Solid electrolytic capacitor and method of producing the same

The present invention provides an electric double layer capacitor. An electric double layer capacitor element sandwiches a separator between a cathode and an anode, arranged inside a container comprising a concave shaped containing portion and lid. A first conductive layer on the inner bottom face of a containing portion is covered by an insulating layer, and opening portions formed on the insulating layer penetrate to the first conductive layer. A second conductive layer is formed on the insulating layer and inside the opening portions, and is connected to a cathode through a conductive adhesive. The first conductive layer penetrates through the side wall of the containing portion, and is connected to a connecting terminal. An anode is connected to a third conductive layer through a conductive adhesive, and a collector is connected to a connecting terminal by extending between the containing portion and the lid.

Electric double layer capacitor

An electrochemical device includes a pair of electrodes at least containing activated carbon powder, a separator interposed between the pair of electrodes, and an electrolytic solution impregnated into the pair of electrodes and the separator. The electrodes and the separator are stacked on a collector. Each of the electrodes includes at least two layers arranged in a thickness direction, and the two layers are made of the activated carbon powder having mutually different average grain sizes. The average grain size of the activated carbon powder in the layer contacting the separator is greater than the average grain size of the activated carbon powder in the layer located on the collector side.

Electrochemical device

The present invention provides an electric double layer capacitor that has less chance for internal resistance increase. For this objective, in this electric double layer capacitor, an electric double layer capacitor element sandwiches a separator between a cathode and an anode, arranged inside a container comprising a lid and a concave shaped containing portion. On the inner bottom face in the containing portion, an insulating layer having a first conductive layer connected to a connecting terminal, and an opening portion penetrates to the first conductive layer are formed, wherein a second conductive layer fills inside the opening portion. Onto the insulating layer and the second conductive layer, a third conductive layer which laminates a first layer comprised of aluminum and a second layer comprised of carbon, is formed and connected to the cathode. The fourth conductive layer is connected to the anode, and also connected to the connecting terminal.

An electric double layer capacitor includes: a cell which includes a pair of polarizable electrodes impregnated with an electrolytic solution and disposed in opposed relation with a separator interposed therebetween; collector electrodes respectively attached to the polarizable electrodes; and a sealing member of a synthetic resin which seals a periphery of the cell. The collector electrodes extend outward of the sealing member through the sealing member in contact with the sealing member. The collector electrodes each have a rough surface portion which extends through the sealing member.

Electric double layer capacitor and electrolytic cell

A method of producing a hydrogen storage alloy, for use in alkaline storage batteries, includes two steps. A first step involves preparing alloy particles having a CaCu-type crystal structure and the compositional formula MmNiCoMnM, wherein M represents at least one element selected from the group consisting of aluminum (Al) and copper (Cu), 3.0&#x2266;x&#x2266;5.2, 0&#x2266;y&#x2266;1.2, 0.1&#x2266;z&#x2266;0.9, and 4.4&#x2266;x+y+z&#x2266;5.4. A second step involves immersing the alloy particles in an acid treating solution containing a cobalt compound and a copper compound, each in the amount of 0.1 to 5.0% by weight based on the weight of the alloy particles, and an organic additive to remove oxide films from and to reductively deposit cobalt and copper on a surface of each alloy particle to form a surface region surrounding a bulk region and having a graded composition. When the sum in percentage of numbers of cobalt (Co) atoms and copper (Cu) atoms present in the surface region is given by a and that in the bulk region by b, the relationship a/b&#x2267;1.3 is satisfied.

Method for production of hydrogen storage alloy for use in alkaline storage batteries

A hydrogen storage alloy, for use in alkaline storage batteries, having a CaCu -type crystal structure and represented by the compositional formula MmNi Co Mn M (wherein M represents at least one element selected from the group consisting of aluminum (Al) and copper (Cu); x is a nickel (Ni) stoichiometry and satisfies 3.0&lE;x&lE;5.2; y is a cobalt (Co) stoichiometry and satisfies 0&lE;y&lE;1.2; z is a manganese (Mn) stoichiometry and satisfies 0.1&lE;z&lE;0.9; and the sum of x, y and z satisfies 4.4&lE;x&plus;y&plus;z&lE;5.4). The hydrogen storage alloy includes a bulk region having a CaCu -type crystal structure and a substantially uniform composition and a surface region surrounding said bulk region and having a graded composition. When the sum in percentage of numbers of cobalt (Co) atoms and copper (Cu) atoms present in the surface region is given by a and that in the bulk region by b, the relationship a/b&gE;1.3 is satisfied.

Hydrogen storage alloy for use in alkaline storage batteries and method for production thereof

A hydrogen storage alloy electrode containing, as a principal active material, a powder of hydrogen storage alloy having a CaCu crystal structure and represented by the formula MmNi Co Mn M where M is at least one element selected from aluminum (Al) and copper (Cu), x is between 3.0 and 5.2, y is between 0 and 1.2, z is between 0.1 and 0.9, w is between 0.1 and 0.9, and the sum of x, y, z and w is between 4.4 and 5.4. The hydrogen storage alloy powder particles have a surface region and a bulk region enclosed within the surface region and have a higher nickel content in the surface region than in the bulk region. The hydrogen storage alloy electrode further contains an oxide and/or hydroxide of at least one rare-earth element selected from ytterbium (Yb), samarium (Sm), erbium (Er) and gadolinium (Gd).

Hydrogen storage alloy electrode and method for manufacture thereof

In the present invention, a hydrogen absorbing alloy obtained by sintering hydrogen absorbing alloy powder containing not less than 50% by weight of particles having a particle diameter of not more than 25 &mgr;m at a temperature of not more than 850&deg; C. is used for a hydrogen absorbing alloy electrode for an alkali storage battery, and the hydrogen absorbing alloy electrode for an alkali storage battery is used as a negative electrode of the alkali storage battery.

Hydrogen absorbing alloy for alkali storage battery, hydrogen absorbing alloy electrode for alkali storage battery, and alkali storage battery

In the present invention, a hydrogen absorbing alloy containing at least nickel, cobalt and aluminum, in which the sum a of the respective abundance ratios of cobalt atoms and aluminum atoms in a portion to a depth of 30 &angst; from its surface and the sum b of the respective abundance ratios of cobalt atoms and aluminum atoms in a bulk region inside thereof satisfy conditions of a/b&gE;1.30, or a hydrogen absorbing alloy containing at least nickel, cobalt, aluminum and manganese, in which the sum A of the respective abundance ratios of cobalt atoms, aluminum atoms and manganese atoms in a portion to a depth of 30 &angst; from its surface and the sum B of the respective abundance ratios of cobalt atoms, aluminum atoms and manganese atoms in a bulk region inside thereof satisfy conditions A/B&gE;1.20 is used for a hydrogen absorbing alloy electrode in an alkali secondary battery.

Hydrogen absorbing alloy electrode, method of fabricating hydrogen absorbing alloy electrode, and alkali secondary battery

A hydrogen absorbing alloy electrode is provided which has an excellent oxygen gas absorbing capacity and further improved in charge-discharge cycle characteristics and high-rate discharge characteristics. The electrode contains a powder prepared by mixing a hydrogen absorbing alloy powder with a powder of at least one complex oxide selected from the group consisting of a ZrO &mdash;Y O solid solution, ZrO &mdash;CaO solid solution, CeO &mdash;Gd O solid solution, CeO &mdash;La O solid solution, ThO &mdash;Y O solid solution, Bi O &mdash;Y O solid solution, Bi O &mdash;Gd O solid solution, Bi O &mdash;Nb O solid solution and Bi O &mdash;WO solid solution. Preferably the electrode contains 0.1 to 10 wt. % of the complex oxide powder based on the combined amount of the two powders.

Hydrogen absorbing alloy electrode and process for producing same

A hydrogen absorbing alloy electrode is provided which is improved in hydrogen gas absorbing ability and in low-temperature discharge characteristics. The electrode contains a hydrogen absorbing alloy having a crystal structure of the CaCu5 type and represented by the stoichiometric ratio ABx, the hydrogen absorbing alloy being represented by MmNiaCobAlcMd wherein Mm is a misch metal, M is Mn and/or Cu, the atomic ratios a, b, c and d are in the respective ranges of 3.0&lE;a&lE;5.2, 0&lE;b&lE;1.2, 0.1&lE;c&lE;0.9, 0.1&lE;d&lE;0.8, wherein X is the sum of the atomic ratios a, b, c, and d, such that, X&equals;a&plus;b&plus;c&plus;d and, is in the range of 4.4&lE;X&lE;5.4. More specifically, the electrode contains a hydrogen absorbing alloy powder at least 5.0 in X, and a hydrogen absorbing alloy powder less than 5.0 in X.

In a pasted hydrogen-absorbing alloy electrode of this invention, an active material layer made from a mixture of a hydrogen-absorbing alloy powder, a composite particle powder including carbon particles and a rare earth compound for partially coating surfaces of the carbon particles, and a binder is formed on a current collector. When this pasted hydrogen-absorbing alloy electrode is used in an alkaline storage battery, the alkaline storage battery can attain small increase of the internal pressure during charge, large discharge capacity in high rate discharge and good charge-discharge cycle performance.

Pasted hydrogen-absorbing alloy electrode for alkaline storage battery

A hydrogen absorbing alloy electrode characterized in that the electrode consists mainly of a mixture of a first hydrogen absorbing alloy powder A formed on surfaces of particles thereof with a surface layer,containing metallic copper or a copper oxide and a second hydrogen absorbing alloy powder B formed on surfaces of particles thereof with a surface layer,containing metallic cobalt or a cobalt oxide. The copper-coated hydrogen absorbing alloy powder A affords improved electric conductivity, and the cobalt-coated hydrogen absorbing alloy powder B gives improved ability to absorb and desorb hydrogen, whereby the electrode is improved in different battery characteristics, such as cycle characteristics, high-rate discharge characteristics and infernal pressure characteristics, at the same time.

Hydrogen absorbing alloy electrode and process for fabricating same

A hydrogen storage alloy electrode for a battery is made of a hydrogen storage alloy powder which includes agglomerates of hydrogen storage alloy particles joined together through a metallic layer. A method of making the electrode includes forming agglomerates of hydrogen storage alloy particles joined together by a metallic layer which covers surface portions of the particles, and then forming the electrode using a resulting powder including the agglomerates.

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Hirakata, Japan

Kikuko Kato