KOH concentration effect on the cycle life of nickel—hydrogen cells: III. Cycle life test

✍ Scribed by H.S. Lim; S.A. Verzwyvelt

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 418 KB
• Volume: 22
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/0378-7753(88)80016-8

✦ Synopsis

A cycle life test of Ni/H2 cells containing electrolytes of various KOH concentrations and a sintered-type nickel electrode was carried out at 23 "C using a 45 min, accelerated, low earth orbit (LEO) cycle regime at 80% depth of discharge. One of three cells containing 26% KOH has achieved over 28 000 cycles, and the other two 19 000 cycles, without a sign of failure in this accelerated cycle life test, which is still in progress. Two other cells containing 31% KOH electrolyte, which is the concentration presently used in aerospace cells, failed after 2979 and 3620 cycles in the same test. This result indicates that the cycle life of the present type of Ni/H, cell may be extended by a factor of 5 -10 simply by lowering the KOH concentration from 31% to 26%.