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FIT's at service lives less than 3.6 and 6.2 hr for 30/32 and 28/32 configurations, respectively. Again, without excess redundancy (30/32), tm of -650,000h is necessary, while for a more redundant design (28/32), t,~ -450,000 would be sufficient at 10 yr of service. Of course, perhaps we have a low estimate for tin, and its true population value may be near the upper limit given in Table III (-440,000h). Consequently, a battery service life over 6 yr could be assured in the standard (30/32) configuration. Nonetheless, one should not infer that Ni-Cd cells in the 30/32 mode do not perform satisfactorily at 10 yr of service because the state of the art in cell fabrication has advanced beyond the technology of the 1964-1977 period. AcknowledgmentsThis paper is respectfully dedicated to the memory of James W. Nielsen.We are grateful to D. W. Maurer and the late J. W. Nielsen for their interest in this work and for a critical reading of the paper. We also appreciate helpful suggestions by W.B. Grupen and J. V. DiLorenzo in the preparation of the manuscript. ABSTRACTThe characteristics of copper sulfide cathodes have been evaluated in typical organic electrolyte lithium batteries. The behavior of a-CusS (chalcocite), Cu,.~6S (digenite), and CuS (covellite) is discussed in terms of mechanism of reaction, discharge properties, and energy content. In view of possible use in primary, voltage-compatible lithium batteries, Cu2S shows the most interesting performance, both in terms of constancy of the operational voltage and in terms of discharge rates.) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 129.89.24.43 Downloaded on 2015-07-21 to IP

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