Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Soryu Nakayama

Kohji Yuasa

Hideo Kaiya

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.

Negative electrode and nickel-metal hydride storage battery using the same

In order to provide a nickel-metal hydride storage battery capable of preventing the formation of a minute chemical short circuit between the positive and negative electrodes while exhibiting an excellent self-discharge resistance, a nickel positive electrode plate is formed by filling an active material mainly composed of a hydroxide of nickel into a porous sintered nickel substrate, followed by further forming a layer of a manganese compound containing manganese with a valence of 2 or more on the surface thereof, and an alkaline storage battery is configured by using this nickel positive electrode plate.

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Atsugi, Japan

Soryu Nakayama