As part of the DoD/NASA Lithium-Ion and More-Electric Aircraft (MEA) development programs, in-house life-testing and performance characterization of lithium-ion batteries of sizes 1-20 amp-hours (Ah) were performed. Using AC impedance spectroscopy, the impedance behavior of lithium-ion cells with respect to temperature, cycle number, electrode, and state-of-charge was determined. Cell impedance is dominated by the positive (cathode) electrode, increases linearly with cycle number, and exponentially increases with decreasing temperature. From cell performance testing, we have seen the cell behavior is extremely sensitive to the ambient temperature. Preliminary battery performance results as well as AC impedance and life cycle test results are presented below.
AC Impedance Characterization and Life Testing of Lithium-Ion Batteries
Sae Technical Papers
Aerospace Power Systems Conference ; 1999
1999-04-06
Aufsatz (Konferenz)
Englisch
AC Impedance Characterization and Life Testing of Lithium-Ion Batteries
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