Abstract
A functional thin-film microbattery has been developed at the Technology Laboratory of Eveready Battery Company (EBC). The microbattery is constructed using cathode sputtering for deposition of the contacts, TiS 2 cathode, and oxide-sulfide solid electrolyte; high vacuum vapor deposition is used for a LiI layer and Li anode. The completed microbattery has an overall thickness of approximately 10 μm and an open-circuit voltage near 2.5 V. On the primary discharge the microbattery shows close to 100% cathode utilization (based on a one electron change) to a 1.8 V cutoff at current densities ranging from 10 to 135 μA/cm 2. The microbattery is capable of supplying current pulses of two seconds duration at current densities greater than 2 mA/cm 2. The microbattery also shows excellent secondary performance. Cells routinely give over 1000 cycles of 100% cycling efficiency (discharge capacity equal to the charge capacity) at greater than 70% cathode utilization on each cycle.
Published Version
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