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Effect of Electrode Separation on Discharge

Three reasons for MH battery self-discharge have been proposed. Two mechanisms are the same as for Ni-Cd batteries. The first is self-discharge of NiOOH. NiOOH reacts with water to produce oxygen, which diffuses to the MH electrode, oxidizing the hydride. The second is a shuttle effect of impurity ions from the separator (Dcoma et al. 1987, Fukunaga et al. 1993). Conventional polyamide (nylon) separator tends to produce an ammonium ion (NHJ) by hydrolysis in concentrated alkaline solution at higher temperature. The ammonium ion is oxidized to the nitrite ion (NO2) on the NiOOH electrode, while the nitrite ion is reduced to the ammonium ion on the MH electrode as follows ... [Pg.169]

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