Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to a penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. The Phase II program was successfully completed with a demonstration of 34 months of continuous cell float and still yielding an output capacity of 2200 Ah or 110 percent of rated cell capacity.It was established, through the accelerated corrosion study, that the estimated life of ERC's Ni-Cd cells exceeded eight years with cells still maintaining an output capacity of over 100 percent of rated capacity; extrapolated results indicated that at least a 10-year life is attainable.Six advanced 2000-Ah Ni-Cd cells demonstrated a cycle life of 600 cycles at the 1C rate while yielding an output capacity of 2100 Ah without cell failure. In addition, the cells demonstrated an energy density of 19 Wh/lb at the 1-hr rate.The approach taken under Task 1.0 consisted of testing ten 2000-Ah cells (Designs #1 and #2) from Phase I and subjecting them to a constant potential charge, (float) of 1.35 V/cell. Periodically, these were discharged at the 1-hr rate, (2000 Amps) to 0.8 V/cell, followed by a second capacity test discharge at the 1-hr rate to 0.8 V/cell. Cells were then recharged and returned to the float regime at 1.35 V/cell. These cells accumulated a total of 34 months on continuous float, yielding 2200 Ah or 110 percent of rated cell capacity.In Task 2.0 an accelerated test program was performed to determine the ultimate life of ERC's roll-bonded, positive electrodes. Corrosion rates of graphite and current collector i NSWCDD/TR-94/50 oxidation where performed in the presence and absence of nickel hydroxide at various temperatures. To separate the effects of loss in capacity due to the "aging" of nickel hydroxide at various temperatures and capacity loss due to graphite oxidation (potassium carbonate formation) cells were also constructed and tested. In addition, cells using sintered electrodes were tested to determine how nickel hydroxide ages in the absence of graphite and the presence of large quantities of K 2 CO 3 (potassium carbonate). The corrosion study consisted of three independent subtasks which proceeded in parallel. These subtasks were: Subtask 2.1 -Graphite Corrosion Subtask 2.2 -Simulated Cell Corrosion Subtask 2.3 -Effects of K 2 CO 3 (potassium carbonate) on cell capacity A total of 300 cells, ...
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