On the anomalous behaviour of deeply discharged, sealed NiCd cells

✍ Scribed by J. Mrha; M. Musilová; J. Jindra

• Book ID: 103897891
• Publisher: Elsevier Science
• Year: 1982
• Tongue: English
• Weight: 359 KB
• Volume: 8
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/0378-7753(82)85007-6

✦ Synopsis

Some sealed Ni-Cd cells on a deep, constant-current discharge show anomalous behaviour in that their voltage remains (after polarity reversal) in the range from -60 to -260 mV. This situation can sometimes persist for an unlimited time without any increase in the over-pressure in the cell or of its voltage. A necessary condition for the appearance of this discharge voltage level is a discharge capacity reserve of the cadmium electrode and the presence of cadmium in the separator as a result of its migration from the negative to the positive electrode. The cadmium particles form bridges across the separator leading eventually to a short circuit, whereby the electrode reactions in the cell cease. This concept was substantiated by using separators impregnated with Cd(OH)z.