High-power lithium-ion batteries are promising alternatives to the nickel metal hydride (Ni-MH) batteries currently being used for energy storage in hybrid electric vehicles (HEVs). The use of lithium-ion batteries in the HEV systems is currently limited by their calendar-life performance, thermal abuse characteristics, and cost. To address these barriers, ANL investigated high-power battery systems based on Li(1+x) (Ni(.33)Co(.33)Mn(.33))(1-x)O2 active materials that could offer low cost, long cycle and calendar life, and inherent safety. Promising results are achieved by adding 10% excess lithium to the cathode. A figure shows calendar life test results at 55 deg C in comparison to those of a competitive material. One observation is that the new material exhibits a leveling off of area specific impedance after some period of time and cycling.
Advanced cathode materials for high power applications
2006
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Aufsatz (Konferenz)
Englisch
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