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1200 hr (corresponding to 160 cycles) in the case of the cycle test while the electrode with the same com-position has a tifetime as short as 550 hr in the case of the continuous discharge test seen in Fig. 8 suggests that the deterioration advances very slowly during the charge periods. In fact, it has been revealed by an-other experiment hat an electrode undergoing the continuous charge extending for 500 hr shows almost the same I-V characteristics a the initial ones. These experimental results suggest hat the deterioration is advanced by the self-aggravating cycle, namely, (i) wetting caused by the decomposition of the hydro-phobant, (if) lack of oxygen supply by (i), (iii) re-duction of oxide by (ii), (iv) increase of resistivity and resulting current concentration by (iii), and ac-celeration of wetting by (iv). Thus to obtain an electrode with a longer lifetime, it is necessary to search for a hydropho~)ant which is stable in alkaline solutions and has good penetrabil ity into the electrode as well. If a suitable hydrophobant can be found, these types of air electrodes would be promising for metal /a ir batteries because of their ex-cellent resistivity to anodic oxidation. Manuscript submitted Dec. 16, 1975; revised manu-script received Nov. 1, 1976

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