Evaluation of TIAX High Energy CAM-7/Graphite Lithium-Ion Batteries at High and Low Temperatures
Final rept. Nov 2013-Jun 2014
ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
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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 C20 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 C20 and C5 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 C20 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.
- Electrochemical Energy Storage