Evaluation of TIAX High Energy CAM-7/Graphite Lithium-Ion Batteries at High and Low Temperatures

Report No. ARL-TR-7023
Authors: Joshua L Allen, Jan L Allen, Samuel A Delp, and T Richard Jow
Date/Pages: August 2014; 20 pages
Abstract: We evaluated lithium-ion battery cells (standard- and high-loading) from TIAX, LLC to determine the capacity and fade rate (projected cycle life) at low (20 °C), room (25 °C), and high temperature (50 °C). Standard-loading cells cycled well at 25 °C with a fade rate of 0.025% per cycle and a C/20 capacity of 2.21 A·h; the projected cycle life is ~800 cycles with 80% capacity retention. At 20 °C, standard-loading cells displayed a lower C/20 and C/5 capacity (1.81 and 1.65 A·h). At 50 °C, standard-loading cells had an elevated fade rate of 0.048% per cycle, but are expected to cycle in excess of 400 cycles with 80% capacity retention. High-loading cells had a C/20 capacity of 2.67 A·h and the capacity loss between 25 and 20 °C was more severe (31% vs. 20% for standard-loading), but they had a larger final capacity (1.72 A·h). The fade rate for high-loading cells was larger (0.06% and 0.09% per cycle at 25 and 50 °C, respectively) with a projected cycle life of ~350 and ~250 cycles at 25 and 50 °C. These results indicate that standard-loading cells are ideal for applications where cycle life is imperative, while high-loading cells are ideal for high-energy applications (even in extreme conditions) where cycle life is a secondary concern.
Distribution: Approved for public release
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Last Update / Reviewed: August 1, 2014