Energy and power characteristics of Li-ion cells

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At Sandia National Laboratories the authors are evaluating the energy and power characteristics of commercially available Li-ion cells. Cells of several different sizes (20 Ah, 1.1 Ah, 0.750 Ah and {approximately}0.5 Ah) and geometries (cylindrical and prismatic) from several manufacturers were studied. The cells were pulsed discharged at increasing currents (50 mA to 1,000 mA) over a range of temperatures (+35 C to {minus}40 C) and at different states of charge (4.1 V, open circuit voltage (OCV), fully charged, 3.6 V OCV partially discharged and 3.1 V OCV nearly discharged) and the voltage drop was recorded. The voltage drop was ... continued below

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6 p.

Creation Information

Nagasubramanian, G.; Jungst, R.G.; Ingersoll, D.; Doughty, D.H.; Radzykewycz, D. & Hill, C. June 8, 1998.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

At Sandia National Laboratories the authors are evaluating the energy and power characteristics of commercially available Li-ion cells. Cells of several different sizes (20 Ah, 1.1 Ah, 0.750 Ah and {approximately}0.5 Ah) and geometries (cylindrical and prismatic) from several manufacturers were studied. The cells were pulsed discharged at increasing currents (50 mA to 1,000 mA) over a range of temperatures (+35 C to {minus}40 C) and at different states of charge (4.1 V, open circuit voltage (OCV), fully charged, 3.6 V OCV partially discharged and 3.1 V OCV nearly discharged) and the voltage drop was recorded. The voltage drop was small at ambient and near ambient temperatures indicating that the total cell internal impedance was small under these conditions. However, at {minus} 40 C the voltage drop was significant due to an increase in the cell internal impedance. At a given temperature, the voltage drop increases with decreasing state-of-charge (SOC) or OCV. The cell impedance and other electrochemical properties as a function of temperature and SOC were also measured. The Ragone data indicate that the specific power and specific energy of Li-ion cells of different sizes are comparable and therefore scaling up to {approximately}20 Ah does not affect either the energy or the power.

Physical Description

6 p.

Notes

OSTI as DE98004674

Source

  • 38. annual power sources conference, Cherry Hill, NJ (United States), 8-11 Jun 1998

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  • Other: DE98004674
  • Report No.: SAND--98-0889C
  • Report No.: CONF-980644--
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/654347 | External Link
  • Office of Scientific & Technical Information Report Number: 654347
  • Archival Resource Key: ark:/67531/metadc709775

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  • June 8, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • May 5, 2016, 8:02 p.m.

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Nagasubramanian, G.; Jungst, R.G.; Ingersoll, D.; Doughty, D.H.; Radzykewycz, D. & Hill, C. Energy and power characteristics of Li-ion cells, report, June 8, 1998; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc709775/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.