Abstract: A sealed nickel metal-hydride battery shows a high output density and an excellent cycle performance particularly in a cold atmosphere. In a nickel metal-hydride battery having a nickel electrode and a hydrogen absorbing electrode respectively as positive electrode and negative electrode, the hydrogen absorbing electrode is formed by making an conductive support carry hydrogen absorbing alloy powder of rare earth elements and non-rare earth elements including nickel and the saturation mass susceptibility of the hydrogen absorbing alloy powder is 2 to 6 emu/g while the rate at which the hydrogen absorbing electrode carries hydrogen absorbing alloy powder per unit area is 0.06 to 0.15 g/cm2.

Abstract: A hydrogen-absorbing alloy for an alkaline storage battery with high power characteristics and excellent output power stability and a method for manufacturing the same are provided. The hydrogen-absorbing alloy for an alkaline storage battery of the invention is represented by ABn (A: LaxReyMg1-x-y, B: Nin-zTz, Re: at least one element selected from rare earth elements including Y (other than La), T: at least one element selected from Co, Mn, Zn, and Al, and z>0) and has a stoichiometric ratio n of 3.5 to 3.8, a ratio of La to Re (x/y) of 3.5 or less, at least an A5B19 type structure, and an average C axis length ? of crystal lattice of 30 to 41 ?.

Abstract: The invention relates to a metal-containing, hydrogen-storing material which contains a catalyst for the purpose of hydration or dehydration, said catalyst being a metal carbonate. The method for producing such a metal-containing, hydrogen-storing material is characterized by subjecting the metal-containing material and/or the catalyst in the form of a metal carbonate to a mechanical milling process.

Abstract: To provide a hydrogen storage alloy for an alkaline battery capable of having high performance of power characteristics much more beyond the related-art range, and a production method thereof, as well as an alkaline battery by investigating the constituent ratios of the A2B7-type structure and the A5B19-type structure. The hydrogen storage alloy for an alkaline battery of the present invention includes: an element R selected from the Group IV and the rare earth elements including Y and excluding La; and an element M consisting of at least one of Co, Mn, and Zn. The hydrogen storage alloy is represented by general formula: La?R1????Mg?Ni?????Al?M? (wherein ?, ?, ?, ?, ? satisfy numerical formulae: 0???0.5, 0.1???0.2, 3.7???3.9, 0.1???0.3, 0???0.2); and the constituent ratio of the A5B19-type structure is 40% or more in the crystal structure thereof.

Abstract: An active material composition for an alkaline storage battery comprises a) an alloy capable of forming a hydride, of formula R1-yMgyNit-zMz in which R is La, optionally substituted by Nd and/or Pr, M is at least one element chosen from the group comprising Mn, Fe, Al, Co, Cu, Zr and Sn, in which 0.1?y?0.4, 3.2?t?3.5, and z?0.5, and of which the equilibrium hydrogen pressure with the alloy, for a hydrogen insertion into the alloy of 0.5 H/Metal at 40°, is less than 0.7 bar, and b) a yttrium-based compound in a mixture with alloy a).

Abstract: In a method for preparing a hydrogen absorbing electrode, a hydrogen absorbing alloy which contains a rare earth element as an alloy constituent and a transition metal element is immersed in an aqueous alkaline solution so that the saturation mass susceptibility is 1.0 to 6.5 emu/g of the hydrogen absorbing alloy. The hydrogen absorbing alloy is mixed through the immersing step with an oxide or hydroxide of a rare earth element wherein the oxide or hydroxide has as a main component at least one element selected from the group consisting of Dy, Ho, Er, Tm, Yb, and Lu. Then, a mixture of the hydrogen absorbing alloy and the oxide or hydroxide of the rare earth element is applied to form a desired shape.

Abstract: It is an object of the present invention to improve the cycle performance in a nickel-metal hydride battery using a rare earth-Mg—Ni type alloy. The present invention provides a nickel-metal hydride battery having a negative electrode including an La—Mg—Ni based hydrogen absorbing alloy, wherein the hydrogen absorbing alloy has a crystal phase having Gd2Co7 type crystal structure and contains calcium.

Abstract: A negative electrode plate of a nickel hydrogen storage battery includes a nonaqueous polymer binder and has an effective surface area per unit capacity of 70 cm2/Ah or more. The density of the first and second separators between positive and negative electrode plates ranges from 450 kg/m3 to 600 kg/m3. The nonwoven fabrics of the separators are formed by combining microfibers and compound fibers through melting portions of the compound fibers. The fibers have a virtually circular cross-section. The microfibers and the compound fibers have a diameter ranging from 1 ?m to less than 5 ?m and a diameter ranging from 5 ?m to 15 ?m, respectively. The proportion of the microfibers to whole fibers ranges from 10 percent by mass to 20 percent by mass. At least one of the nonwoven fabrics of the separators is subjected to sulfonation treatment.

Abstract: Energy storage cells, batteries and associated methods and uses are implemented in a variety of manners. Consistent with one such implementation, a lithium ion and hydrogen ion battery cell includes a first electrode configured to store energy by interacting with lithium cations. A second electrode is configured to store energy by interacting with hydrogen cations. An aqueous electrolyte separates the first electrode from the second electrode and provides both the lithium cations and the hydrogen cations.

Abstract: 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° C. or greater for B minutes. A and B satisfy 2410?A×B?2800.

Abstract: A hydrogen storage alloy includes a composition defined by the following formula (Ca1-XLX)(Li1-Y-ZMYNiZ)m, wherein the L denotes one or more elements selected from the group consisting of Na, K, Rb, Cs, Mg, Sr, Ba, Sc, Ti, Zr, Hf, V, Nb, Ta, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, the M denotes one or more elements selected from the group consisting of Cr, Mo, W, Mn, Fe, Ru, Co, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, B, Al, Ga, In, Si, Ge, Sn, Pb, Sb, Bi, and S, and the mole ratios X, Y, Z, and m respectively satisfy the following 0<X?0.4, 0?Y?0.4, 0.1?Z?0.4, and 1.8?m?2.2.

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

Abstract: Bridged graphite oxide material comprising graphite sheets bridged by at least one diamine bridging group. The bridged graphite oxide material may be incorporated in polymer composites or used in adsorption media.

Abstract: In contrast, the alkaline compound included in the composition of the Document D1 is strong alkali, such as sodium hydroxide. Therefore, the oxide of an alkaline earth metal used in the amended invention is not disclosed or suggested in the D1 at all. In addition, the composition of D1 is an oxygen scavenger and it includes compound which enhance the reaction of oxygen with hydrogen, such as catalyst. Therefore, its hydrogen generating ability is lower than that of the claimed invention.

Abstract: A hydrogen occlusive alloy has a cubic structure and a composition represented by the following general formula (1): (Mg1-XLX)(Ni1-Y-ZMYLiZ)m??(1) where the element L is at least one element selected from the group consisting of Na, Cs, Ca, Sr, Ba, Sc, Ti, Zr, Hf, V, Nb, Ta, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, the element M is at least one element selected from the group consisting of Cr, Mo, W, Mn, Fe, Co, Pd, Pt, Cu, Ag, Zn, Cd, B, Al, Ga, In, Si, Ge, Sn, Pb, Sb and Bi, and mole ratios X, Y, Z and m are 0<X?0.5, 0<Y?0.5, 0.1?Z?0.9, and 1.8?m?2.2, respectively.

Abstract: Provided is a hydrogen storage alloy which is characterized in that two or more crystal phases having different crystal structures are layered in a c-axis direction of the crystal structures. The hydrogen storage alloy is further characterized in that a difference between a maximum value and a minimum value of a lattice constant a in the crystal structures of the laminated two or more crystal phases is 0.03 ? or less.

Abstract: The invention provides a hydrogen storage alloy, and in particular, the hydrogen storage alloy according to the invention has a narrow hysteresis and a maximum hydrogen concentration, (H/Lm (NixAlyMoz)), equal to 7. The hydrogen storage alloy, according to the invention, is an ABw type alloy and represented by the general formula: Lm(NixAlyMoz), and where 4.7?w?5.3, Lm is a La-rich misch metal and comprises La, Ce, Pr, and Nd., w=x+y+z, x, y and z are a mole number, respectively.

Abstract: An alkaline storage cell has a negative electrode containing hydrogen-storing alloy powder, additive powder containing metal zinc or zinc compound, and a binding agent for binding particles of the powders. The hydrogen-storing alloy powder has a composition expressed by a general expression: Ln1-xMgx(Ni1-yTy)z, where Ln represents at least one element chosen from a group consisting of the lanthanoids, Ca, Sr, Sc, Y, Ti, Zr and Hf, T represents at least one element chosen from a group consisting of V, Nb, Ta, Cr, Mo, Mn, Fe, Co, Al, Ga, Zn, Sn, In, Cu, Si, P and B, and x, y and z represent numerical values which meet 0<x<1, 0?y?0.5 and 2.5?z?4.5.

Abstract: A lithium battery comprises a negative electrode composition that uses lithium hydride and a second metal. The negative electrode composition is activated by infusing lithium into particles of the second metal hydride to form lithium hydride and the second metal. As the battery is discharged lithium is released from the electrode and the second metal hydride formed. Charging of the battery re-infuses lithium into the negative electrode composition with the re-formation of lithium hydride.

Abstract: Multi-directional currents are generated in a medium by cyclically reversing the direction of a conventional current applied to at least one of at least two electrodes so that an electromotive force (EMF) pulse travels from side of the electrode to the other, changing the direction of current in the medium. The multi-directional currents may be used to accelerate electrolytic processes such as generation of hydrogen by water electrolysis, to sterilize water for drinking, to supply charging current to a battery or capacitor, including a capacitive thrust module, in a way that extends the life and/or improves the performance of the battery or capacitor, to increase the range of an electromagnetic projectile launcher, and to increase the light output of a cold cathode light tube, to name just a few of the potential applications for the multi-directional currents.

Abstract: Electrochemical energy sources based on solid-state electrolytes are known in the art. These (planar) energy sources, or ‘solid-state batteries’, efficiently convert chemical energy into electrical energy and can be used as the power sources for portable electronics. The invention relates to an improved electrochemical energy source. The invention also relates to an electronic device provided with such an electrochemical energy source.

Abstract: The present invention is directed to methods for making magnetically modified electrodes and electrodes made according to the method. Such electrode are useful as electrodes in batteries, such as Ni-MH batteries, Ni—Cd batteries, Ni—Zn batteries and Ni—Fe batteries.

Abstract: The composition of hydrogen storage alloy particles used in a negative plate of an alkaline secondary battery is expressed by a general formula: (Laa Prb Ndc Zd)1-w Mgw Niz-x-y Alx Ty. In the formula, Z is an element selected from the group consisting of Ce and others, and T is an element selected from the group consisting of V and others. Subscripts a, b, c and d fall in ranges of 0?a?0.25, 0<b, 0<c, and 0?d?0.20, respectively, and satisfy the relationship expressed by a+b+c+d=1, where 0.20?b/c?0.35. Subscripts x, y, z and w fall in ranges of 0.15?x ?0.30, 0?y?0.5, 3.3?z?3.8, and 0.05?w?0.15, respectively.

Abstract: Some metal hydrides permit reversible storage and release of hydrogen for a hydrogen using power-generator. But the surfaces of some metal hydrides or metal hydride precursors may be oxidized or have other coatings that inhibit hydrogen absorption or release. Such materials may be suspended in a suitable liquid of supercritical carbon dioxide or liquid nitrogen and subjected to cavitation processing to break up such hydrogen impermeable surfaces or to fracture the particles so as to provide fresh hydrogen penetratable surfaces.

Abstract: A cartridge comprises a housing that can be easily attached and detached from an electrolyzer so that the hydrogen generated can be stored within the cartridge. The housing is further configured to easily attach and detach from a fuel cell so that the stored hydrogen can be released to the fuel cell for power generation. In preferred embodiments, the cartridge comprises a cathode that serves to generate hydrogen when joined to the electrolyzer, as well as to store hydrogen. With this arrangement, a single device (the fuel cell cartridge) can function to generate hydrogen when connected to form part of the electrolyzer, to store hydrogen (whether attached to either the fuel cell or electrolyzer or neither—in stand alone form), and/or to supply hydrogen to the fuel cell, when connected thereto.

Abstract: A negative electrode for alkaline storage batteries uses a hydrogen-absorbing alloy represented by the general formula Ln1-xMgxNiy-a-bAlaMb, having a crystal structure other than CaCu5 type. First to third layers S1 to S3 are formed on the surface of the bulk phase B of the hydrogen-absorbing alloy. The first layer closest to the bulk phase contains oxygen in a greater amount than the second layer located on the first layer, and contains at least one element soluble in an alkaline solution in an amount of 10 atom % or greater. The second layer located on the first layer has a Ni content higher than that of the bulk phase. The third layer located on the second layer has a NiO content higher than the NiO content in the second layer.

Abstract: An alkaline storage cell has a positive electrode, a negative electrode containing a hydrogen storage alloy, and an alkaline electrolyte. The hydrogen storage alloy has a composition expressed by a general expression: ((PrNd)?Ln1-?)1-?Mg?Ni?-?-?Al?T?, where Ln represents at least one element chosen from a group consisting of La, Ce, etc., T represents at least one element chosen from a group consisting of V, Nb, etc., and subscripts ?, ?, ?, ? and ? represent numerical values which satisfy 0.7<?, 0.05<?<0.15, 3.0???4.2, 0.15???0.30 and 0???0.20.

Abstract: The invention relates to a hydrogen storage material comprising an alloy of magnesium. The invention further relates to an electrochemically active material and an electrochemical cell provided with at least one electrode comprising such a hydrogen storage material. Also, the invention relates to electronic equipment comprising such an electrochemical cell.

Abstract: 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?y?3, the molar ratio z of Co to the total of La and Mg is 0.25?z?0.75, the molar ratio ? of Al to the total of La and Mg is 0.01???0.05, and the molar ratio x of Mg to the total of La and Mg is 0.01?x?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.

Abstract: An alkaline storage cell has a positive electrode, a negative electrode containing a hydrogen storage alloy, and an alkaline electrolyte. The hydrogen storage alloy has a composition expressed by a general expression: Ln1-?Mg?Ni?-?-?T?Al?, where Ln represents at least one element chosen from a group consisting of La, Ce, etc., T represents at least one element chosen from a group consisting of V, Nb, etc., and subscripts ?, ?, ? and ? represent numerical values which satisfy 0.05<?<0.12, 3.40???3.70, 0.01???0.15 and 0.15???0.35.

Abstract: A non-sintered electrode containing a two-dimensional conductive support covered in a layer containing an electrochemically active material and a binder which is a mixture of a styrene-acrylate copolymer and a cellulose compound chosen from methylcellulose, carboxymethylcellulose, hydroxypropylmethylcellulose, hydroxypropylcellulose and hydroxyethylcellulose. The proportion of the styrene-acrylate copolymer is less than 4% by weight of the active layer.

Abstract: A nickel metal hydride secondary battery includes hydrogen storage alloy particles in a negative electrode. The hydrogen storage alloy has a composition expressed by a general formula (LaaSmbGdc“A”d)1-wMgwNixAly“T”z, where “A” and “T” each represent at least one element selected from a group consisting of Pr, Nd, etc., and a group consisting of V, Nb, etc., respectively; subscripts a, b, c and d satisfy relationship expressed by a>0, b?0, c>0, 0.1>d?0, and a+b+c+d=1; and subscripts w, x, y and z fall in a range expressed by 0.1?w?0.3, 0.05?y?0.35, 0?z?0.5, and 3.2?x+y+z?3.8.

Abstract: The synthesis of Pt and PtRu and other Pt based nano-particles that catalyze the electrochemical oxidation of methanol, carbon monoxide and hydrogen, as well as oxygen reduction, is described. The Pt based catalysts are synthesized in solution forming particles of 0.8 to 10 nm size (forming a “colloidal” solution) and are subsequently applied to a desired substrate as e.g., carbon black, graphite, metals. The application of the nano-sized catalyst particles on the substrates involves electroless deposition at open-circuit, such as immersing the substrate into the colloidal solution or spraying the catalyst particles on the substrate. The Pt, PtRu and other Pt based catalyst can also be directly deposited on the substrate involving the simultaneous reduction and deposition of the Pt based catalysts onto the substrate surface and into its porous structure.

Abstract: In a nickel-metal hydride rechargeable battery comprising a positive electrode of nickel hydroxide and a negative electrode of hydrogen-absorption alloy, prolonged battery life is achieved by limiting the charge and discharge operations to be performed in the range of 20-60% of the hydrogen-absorption capacity of the hydrogen-absorption alloy.

Abstract: A hydrogen storage alloy of the present invention includes component A including a rare earth element represented by Ln and magnesium and component B including elements containing at least nickel and aluminum, wherein a primary alloy phase of a hydrogen storage alloy represents an A5B19 type structure; a general formula is represented as Ln1-xMgxNiy-a-bAlaMb (wherein M represents at least one element selected from Co, Mn, and Zn; and 0.1?x?0.2, 3.6?y?3.9, 0.1?a?0.2, and 0?b?0.1); a rare earth element Ln includes maximally two elements containing at least La; and absorption hydrogen equilibrium pressure (Pa) is 0.03-0.17 MPa when the hydrogen amount absorbed in the hydrogen storage alloy (H/M (atomic ratio)) at 40° C. is 0.5.

Abstract: The negative electrode of an alkaline storage cell contains a rare earth-Mg—Ni hydrogen storage alloy. The rare earth-Mg—Ni hydrogen storage alloy has a composition expressed by a general formula: (A?Ln1-?)1-?Mg?Ni?-?-?Al?T? wherein A represents one or more elements selected from the group consisting of Pr, Nd, Sm and Gd and including at least Sm, Ln represents at least one element selected from the group consisting of La, Ce, and the like, T represents at least one element selected from the group consisting of V, Nb, and the like, and subscripts ?, ?, ?, ? and ? represent numerical values which respectively satisfy 0.4??, 0.05<?<0.15, 3.0???4.2, 0.15???0.30 and 0???0.20.

Abstract: The present invention provides a hydrogen absorbing alloy containing a phase of a Gd2CO7 type crystal structure, wherein the phase exists at a ratio of 10 weight % or higher in the entire hydrogen absorbing alloy and yttrium is contained at a ratio of 2 mol % or more and 10 mol % or less in the entire hydrogen absorbing alloy.

Abstract: 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 IA/IB of 0.1 or greater in X-ray diffraction analysis using Cu—K? radiation as an X-ray source, where IA is the strongest peak intensity that appears in the range of 2?=31° to 33°, and IB is the strongest peak intensity that appears in the range of 2?=40° to 44°. The second hydrogen-absorbing alloy has a Co content greater than that of the first hydrogen-absorbing alloy.

Abstract: A nickel-metal hydride storage battery comprising a positive electrode containing nickel hydroxide, a negative electrode containing a hydrogen absorbing alloy, an alkaline electrolyte, and an alkali conducting separator provided between the positive electrode and the negative electrode.

Abstract: A battery is provided containing increased binding energy hydrogen compounds as oxidants of the battery cathode half reaction. The oxidant compounds are provided comprising at least one neutral, positive, or negative hydrogen species having a binding energy greater than its corresponding ordinary hydrogen species, or greater than any hydrogen species for which the corresponding ordinary hydrogen species is unstable or is not observed. The oxidant compounds comprise at least one increased binding energy hydrogen species and at least one other atom, molecule, or ion other than an increased binding energy hydrogen species. The oxidant compound may comprise a cation Mn+ (where n is an integer) bound to an increased binding energy hydride ion such that the binding energy of the cation or atom M(n?1)+ is less than the binding energy of the hydride ion H - ? ( 1 p ) may serve as the oxidant.

Abstract: A sealed nickel metal-hydride battery shows a high output density and an excellent cycle performance particularly in a cold atmosphere. In a nickel metal-hydride battery having a nickel electrode and a hydrogen absorbing electrode respectively as positive electrode and negative electrode, the hydrogen absorbing electrode is formed by making an conductive support carry hydrogen absorbing alloy powder of rare earth elements and non-rare earth elements including nickel and the saturation mass susceptibility of the hydrogen absorbing alloy powder is 2 to 6 emu/g while the rate at which the hydrogen absorbing electrode carries hydrogen absorbing alloy powder per unit area is 0.06 to 0.15 g/cm2.

Abstract: A negative electrode of a nickel-metal hydride storage battery includes an active material layer formed on a conductive substrate and including a hydrogen storage alloy powder and a carbon powder. The carbon powder includes some carbon particles each containing at least one metal selected from a group consisting of Ni, Co, Ca, Fe, Mg, Mn, Ti, and V. Each of the some carbon particles include a particle containing the above metal inside thereof. In this negative electrode, the carbon powder contains a metal therein. Thus, while maintaining excellent gas compatibility carbon material inherently has, the carbon powder has improved conductivity as a conductive agent. Therefore, the use of the negative electrode including a hydrogen storage alloy can provide a nickel-metal hydride storage battery that can prevent an excessive increase in its inner pressure, and has excellent high-current discharge characteristics.

Abstract: A nickel metal hydride battery includes particles of hydrogen storage alloys in the negative electrode. Such hydrogen storage alloys have a composition expressed by a general formula: (LaaSmbAc)1-wMgwNixAlyTz. In the formula, A and T denote at least one element selected from the groups consisting of: Pr, Nd, and the like; and V, Nb, and the like, respectively, the subscripts a, b, and c satisfy the relationship given by: a>0; b>0; 0.1>c?0; and a+b+c=1, and the subscripts w, x, y, and z fall within the range given by: 0.1<w?1; 0.05?y?0.35; 0?z?0.5; and 3.2?x+y+z?3.8.

Abstract: A hydrogen storage alloy containing a phase of a chemical composition defined by a general formula A5·xB1+xC24: wherein in the general formula A5·xB1+xC24, A denotes one or more element(s) selected from rare earth elements; B denotes one or more element(s) selected from a group consisting of Mg, Ca, Sr, and Ba; C denotes one or more element(s) selected from a group consisting of Ni, Co, Mn, Al, Cr, Fe, Cu, Zn, Si, Sn, V, Nb, Ta, Ti, Zr, and Hf; and x denotes a numeral in a range from ?0.1 to 0.8: and the phase has a crystal structure belonging to a space group of R-3m and having a length ratio of the c-axis to the a-axis of the lattice constant in a range of 11.5 to 12.5.

Abstract: An alkaline storage battery including a positive electrode (1), a negative electrode (2) using a hydrogen-absorbing alloy, and an alkaline electrolyte solution employs, as the hydrogen-absorbing alloy in the negative electrode, a hydrogen-absorbing alloy for alkaline storage batteries including at least a rare-earth element, magnesium, nickel, and aluminum, and having an intensity ratio IA/IB of 1.00 or greater, wherein IA is the strongest peak intensity appearing in the range 2?=32°-33° and IB is the strongest peak intensity appearing in the range 2?=35°-36° in an X-ray diffraction analysis using Cu- K? radiation as the X-ray source.

Abstract: An alkaline storage battery system includes an alkaline storage battery 10 including an electrode group having a hydrogen storage alloy negative electrode 11 using a hydrogen storage alloy as a negative electrode active material, a nickel positive electrode 12 using nickel hydroxide as a main positive electrode active material, and a separator 13, and further including an alkaline electrolyte, in an outer can 17, and is performed partial charge-discharge control. Here, the hydrogen storage alloy has at least A5B19 type crystal structure, and a stoichiometric ratio (B/A) representing a molar ratio of B component to A component in the A5B19 type crystal structure is 3.8 or more. According to the alkaline storage battery system of the present invention, an alkaline storage battery system that ensures high power, reduces the used amount of the hydrogen storage alloy significantly, and is controlled partial charging-discharging is obtained.

Abstract: A hydrogen storage material is expressed by a composition formula, (Ca1-xAx)1-z(Si1-yBy)z, wherein “A” is at least one member selected from the group consisting of alkali metal elements, alkaline-earth metal elements, rare-earth elements, the elements of groups 3 through 6, Ni, Au, In, Tl, Sn, Fe, Co, Cu and Ag; “B” is at least one member selected from the group consisting of the elements of groups 7 through 17, rare-earth elements, Hf and Be; 0?x<1 by atomic ratio; 0?y<1 by atomic ratio; and 0.38?z?0.58 by atomic ratio. It is lightweight as well as less expensive. In principle, neither high-temperature nor high-pressure activation is required, because it exhibits a high initial activity. The operation temperature can be lowered and the hydrogen absorption content can be enlarged by controlling the kind and substitution proportion of the substituent elements appropriately.

Abstract: 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 CaCu5 type structure, wherein a content of a phase having a crystal structure of AB2 type 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: R1-a-bMgaTbNiZ-X-Y-?M1XM2YMn???(1).

Abstract: An alkaline storage battery has a positive electrode, a negative electrode utilizing hydrogen-absorbing alloy, and an alkaline electrolyte, and wherein the negative electrode contains a hydrogen-absorbing alloy represented by the general formula Ln1-xMgxNiy-a-bAlaMb, where Ln is at least an element selected from rare-earth elements including Y and Zr and Ti, M is at least one element selected from V, Nb, Ta, Cr, Mo, Mn, Fe, Co, Ga, Zn, Sn, In, Cu, Si, P and B, 0.05?x?0.30, 0.05?a?0.30, 0?b?0.50 and 2.8?y?3.9 and fluorine resins having an average molecular weight of 1,000,000 or less.

Abstract: A hydrogen storage alloy used in a hydrogen storage alloy electrode 11 has a crystalline structure having a mixed phase made up of at least an A2B7 type structure and an A5B19 type structure, and a surface layer of hydrogen storage alloy particles is so formed as to have a nickel content ratio greater than that of a bulk. The ratio (X/Y) of the nickel content ratio X (% by mass) of the surface layer to the nickel content ratio Y (% by mass) of the bulk is greater than 1.0 but no more than 1.2 (1.0<X/Y?1.2). The gradient between the content ratio of the nickel in the surface layer of the hydrogen storage alloy particles and the content ratio of the nickel in the bulk is alleviated and a hydrogen storage alloy electrode with high output characteristics is obtained.