Nickel-metal hydride storage battery and production method thereof
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsChiaki Iwakura, Naoji Furukawa, Yoichi Izumi, Yoshio Moriwaki
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Abstract
In order to obtain a nickel-metal hydride storage battery having a long cycle life and a low self-discharge rate, in a nickel-metal hydride storage battery comprising: a positive electrode containing nickel hydroxide; a negative electrode containing a hydrogen storage alloy; a separator interposed between the positive and negative electrodes; and an electrolyte comprising an aqueous alkaline solution, a water absorbent polymer, a water repellent and an aqueous alkaline solution are added into the separator. This battery can be produced with low cost.
Claims11
A nickel-metal hydride storage battery comprising a positive electrode containing nickel hydroxide, a negative electrode containing a hydrogen storage alloy, and a separator containing a gel electrolyte interposed between said positive and negative electrodes, characterized in that said gel electrolyte comprises a water absorbent polymer, a water repellent material and an aqueous alkaline solution.
A method for producing a nickel-metal hydride storage battery comprising:
- (1) a first step of producing a positive electrode containing nickel hydroxide and a negative electrode containing a hydrogen storage alloy;
- (2) a second step of producing a separator containing a gel electrolyte from a mixture obtained by mixing a water absorbent polymer, a water repellent material and an aqueous alkaline solution;
- (3) a third step of obtaining an electrode group by laminating said positive and negative electrodes with said separator interposed therebetween;
- and
- (4) a fourth step of assembling a nickel-metal hydride storage battery by using said electrode group.
Dependencies are inferred from the claim text.