Zinc and silver migration during rechargeable silver-zinc cell cycling
- Naval Surface Warfare Center, Crane, IN (United States)
A study has been established at NAVSURFWARCENDIV Crane to obtain zinc and silver migration rate data on cellulosic separators derived from a variety of cellulose and cellophane sources, in silver-zinc alkaline rechargeable cells. These data are to be related to cycle and wet life data from the model electrochemical cells as a function of separator composition for the rechargeable cell set. The first examples used in this program are cells of 28 Ahr capacity, identical in every respect except for the separator composition, which are being tested in statistically significant numbers under identical temperature and relative humidity conditions, with 45% KOH as the electrolyte. The cycle life test regime is C/5 discharge to 1.30 V and C/30 and C/60 charge to 2.03 V continuous cycling, while the wet life test regime includes a 30-day wet stand at full charge between cycles. At the outset of the cell testing, a baseline cell was selected from each set in the matrix after the formation cycling was complete, and the silver and zinc migration through successive separator layers were determined. Also, at intervals during life cycle and wet life, and as cells fail the life tests, the measurements will be repeated. In this way a correlation may be established between silver and zinc migration rates under charge discharge conditions in actual cells and the cycle and wet life of the respective cell types. Eight separator compositions, all cellulose-based, are being evaluated. The purpose of the study is to utilize the cycle and wet life data to designate a best separator for incorporation into actual production cells. The recommendations will take the form of minimum separator physical properties which are beneficial to cell performance and long life, resulting in an improvement in the assets available for Navy Fleet use. This paper will discuss the data available on silver and zinc migration and their relationship to cell cycling at several stages during the cell life.
- OSTI ID:
- 549340
- Report Number(s):
- CONF-970168-; ISBN 0-7803-3631-3; TRN: IM9751%%23
- Resource Relation:
- Conference: 12. Annual battery conference on applications and advances, Long Beach, CA (United States), 14-17 Jan 1997; Other Information: PBD: 1997; Related Information: Is Part Of The twelfth annual battery conference on applications and advances: Proceedings; Frank, H.A.; Seo, E.T. [comps.]; PB: 364 p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
Improved separators for silver oxide-zinc and silver oxide-cadmium cells for spacecraft applications. Final report, June 28 1963-September 27, 1964. [30 to 45% KOH]
High Depth‐of‐Discharge Zinc Rechargeability Enabled by a Self‐Assembled Polymeric Coating