A nickel hydride secondary battery (2) houses an electrode group (22) composed of a positive electrode (24) and a negative electrode (26) which are overlapped with each other via a separator (28) with an alkaline electrolyte solution, the negative electrod...

A nickel-metal hydride secondary cell (2) holds therein an electrode group (22) and an alkaline electrolyte solution containing NaOH as a main constituent of its solute. The electrode group has a positive electrode (24) and a negative electrode (26) lapped...

A hydrogen storage alloy with at least two phases containing La, Ni, and Y or a heavy rare earth element, including a first phase having a composition represented by the general formula R1 a R2 b R3 c Ni d R4 e (wherein R1 is at least one element essential...

A modified A 2 B 7 type hydrogen storage alloy having reduced hysteresis. The alloy consists of a base A x B y hydrogen storage alloy, where A includes at least one rare earth element and also includes magnesium, B includes at least nickel, and the atomic ...

A nickel hydrogen rechargeable battery has a positive electrode (24) and a negative electrode (26). The positive electrode (24) includes positive-electrode active material made of nickel hydrogen particles (36) in which magnesium is dissolved, and the nega...

To provide a hydrogen storage alloy for an alkaline storage battery that improves output power by pulverization of the alloy in the initial stage of partial charge and discharge cycles and that maintains its surface condition to improve the amount of lifet...

A hydrogen storage alloy is provided which has an extremely low Co content, and can maintain the drain (power) performance (especially pulse discharge characteristics), activity (degree of activity), and life performance at high levels. The hydrogen storag...

A hydrogen-absorption alloy electrode includes, as a principal material, particles of a hydrogen-absorption alloy containing a rare earth element, Ni, Co, Al and Mn and leads to reduced deviation in battery characteristics after charging/discharging cycles...

In a Ni/metal hydride secondary element with a positive nickel hydroxide electrode, a negative electrode with a hydrogen storage alloy, and an alkaline electrolyte, the positive electrode provided with a three-dimensional metallic conducting framework cont...