Silver-Hydrogen Energy Storage.
Final rept. 15 Jun 76-15 Jun 78,
EIC CORP NEWTON MASS
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During this program we have demonstrated the feasibility of AgH2 cells with 35 to 50 Wh1b, depending on the desired discharge rate, and with a cycle life in excess of 500 deep discharges. This demonstration and the necessary development involved extensive component level studies and performance evaluation using several sets of laboratory cells of approximately 15 Ah in addition to the development of a comprehensive computerized mathematical model for the design and optimization of AgH2 cells of rolled stack configuration. Electrolyte management was identified as the main problem area. The relatively high solubility of silver oxide in the electrolyte necessitates the use of argentistatic membranes similar to those employed in AgZn cells. These membranes have characteristic electrolyte transport properties described by their transference, diffusion and flow parameters. We determined those parameters and showed that a suitable combination of the individual transport characteristics is required to maintain an adequate electrolyte balance during any one charge-discharge cycle and from cycle to cycle.
- Electrochemical Energy Storage