High Rate Lithium-Ion Cell Testing
Abstract
Lithion, a Division of Yardney Technical Products, constructed lithium-ion cells to improve electrode coatings, separators, electrolytes, and other aspects of cell design. Lithium-ion batteries, with their exceptional energy density and cycle-life performance, are replacing other rechargeable battery systems in many applications. With the continued development of applications such as directed energy weapons, unmanned aerial vehicles, and aircraft batteries, lithium-ion technology must continue to develop its high pulse power and high rate continuous discharge performance aspects. While developing a cell with these performance characteristics, all aspects of the lithium-ion system were evaluated: anode material, cathode material, current collectors, electrolyte composition, and separator. For the primary screening method, coin cells were utilized due to their versatility. For this paper, the material development portion of the effort is proprietary and will not be discussed. Cycling performance and characteristics will be discussed for cells ranging in size from 2032 coin cells to the full-scale 9 Ah rated lithium-ion cell. The cells developed under this effort are capable of discharge pulses at 188 C and 25 degrees C, continuous discharge at 112 C and 25 degrees C, and continuous discharge at 28 C and -20 degrees C. Specifically, our 9 Ah cell was discharged with an initial peak specific pulse power of 11kW/kg followed by continuous discharge at 112 C and 25 degrees C, delivering 82% of capacity to 2.5 V and 96% of capacity to 2.0 V.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 2007
- Accession Number
- ADA503323
Entities
People
- Frank Puglia
- Joe Dicarlo
- Joe Wallace
- Seth M Cohen
- Stuart Santee