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

摘要

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 approximately 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 approximately 350 and approximately 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.