Accession Number:

AD0736016

Title:

Control Experiments on Active Material Migration in Zinc Electrodes.

Descriptive Note:

Technical rept.,

Corporate Author:

AIR FORCE AERO PROPULSION LAB WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

Report Date:

1971-10-01

Pagination or Media Count:

48.0

Abstract:

Failure of zinc-silver oxide secondary batteries during cycle life testing occurs either by metallic zinc and silver penetrating the separator material between the plates or by shape change of the zinc electrode. In the latter process, the zinc active material in standard cell designs migrates from the top and sides of the plate toward the center and bottom. The report is concerned with efforts to test an idea that if more uniform current density distribution could be achieved, then the shape change process might be substantially slowed down or, perhaps, eliminated. A total of ten design variations of the Zn-AgO cell were fabricated and repetitively cycled to dtermine the influence of design variation on shape change of the zinc electrode active material. Results for four variations are reported in detail. Quantitative procedures for measurement of current density distribution are required to enable conclusive assessment to achieve improved cycle life by control of shape change.

Subject Categories:

  • Electrochemical Energy Storage

Distribution Statement:

APPROVED FOR PUBLIC RELEASE