High gelled-electrolyte quality with polyacrylamide polymer: limitation of cycle-life through water loss
✍ Scribed by Gerd Pösch
- Book ID
- 103898685
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 383 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0378-7753
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✦ Synopsis
A gelled-electrolyte battery, with lead~alcium grids and over-pressure valves, has to be well designed, accurately manufactured, and charged with an optimized charging system in order to obtain a reasonable lifetime. Besides this detail know-how, which is necessary to reach the present state-of-the-art, the following two factors are critical to performance: (i) gel quality and distribution; (ii) water loss and cycle-life. The gel stiffness as well as the distribution and the correct acid concentration, can be optimally adjusted by the addition of a polyacrylamide-emulsion polymer and a reduction in the silica component. A well monitored and consistent gel quality is important in achieving equal behaviour between all cells in the battery. Water-loss tests have shown that different charging methods result in different lifetimes, from 559 to 2999 cycles. 6 9 12 time after filling [minutes]