An investigation of the impedance rise and power fade in high-power, Li-ion cells.

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Two different cell chemistries, Gen 1 and Gen 2, were subjected to accelerated aging experiments. In Gen 1 calendar life experiments, useful cell life was strongly affected by temperature and time. Higher temperature accelerated cell performance degradation. The rates of impedance increase and power fade followed simple laws based on a power of time and Arrhenius kinetics. The data have been modeled using these two concepts, and the calculated data agree well with the experimental values. The Gen 1 calendar life increase and power fade data follow (time){sup 1/2} kinetics. This may be due to solid electrolyte interface (SEI) layer ... continued below

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Bloom, I.; Jones, S. A.; Battaglia, V. S.; Polzin, E. G.; Henriksen, G. L.; Motloch, C. G. et al. July 18, 2002.

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Two different cell chemistries, Gen 1 and Gen 2, were subjected to accelerated aging experiments. In Gen 1 calendar life experiments, useful cell life was strongly affected by temperature and time. Higher temperature accelerated cell performance degradation. The rates of impedance increase and power fade followed simple laws based on a power of time and Arrhenius kinetics. The data have been modeled using these two concepts, and the calculated data agree well with the experimental values. The Gen 1 calendar life increase and power fade data follow (time){sup 1/2} kinetics. This may be due to solid electrolyte interface (SEI) layer growth. From the cycle life experiments, the impedance increase data follow (time){sup 1/2} kinetics also, there is an apparent change in overall power fade mechanism, from 3% to 6% {Delta}SOC. Here, the power of time changes to a value less than 0.5 indicating that the power fade mechanism is due to factors more complex than just SEI layer growth. The Gen 2 calendar and cycle life experiments show the effect of cell chemistry on kinetics. The calendar life impedance data follow either ''linear'' or (time){sup 1/2} plus linear kinetics, depending on time and temperature.

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  • EVS 19: 19th International Battery, Hybrid and Fuel Cell Electric Vehicle Symposium, Busan (KR), 10/19/2002--10/23/2002

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  • Report No.: ANL/CMT/CP-106667
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 803902
  • Archival Resource Key: ark:/67531/metadc736197

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  • July 18, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • March 22, 2016, 1:49 p.m.

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Bloom, I.; Jones, S. A.; Battaglia, V. S.; Polzin, E. G.; Henriksen, G. L.; Motloch, C. G. et al. An investigation of the impedance rise and power fade in high-power, Li-ion cells., article, July 18, 2002; Illinois. (digital.library.unt.edu/ark:/67531/metadc736197/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.