U.S. DOE FreedomCAR and Vehicle Technologies Advanced Technology Development Program for Lithium-Ion Batteries: Gen 2 Performance Evaluation Interim Report

Christophersen, Jon P. ; Motloch, Chet ; Bloom, Ira D. ; Battaglia, Vince ; Nagasubramanian, Ganesan ; Duong, Tien Q.

Idaho National Laboratory

关键词: Lithium-Ion Batteris;    Electric Potential;    Capacity;    25 - Energy Storage;    Spectroscopy;   

DOI  :  10.2172/910717
RP-ID  :  INEEL/EXT-03-00095
RP-ID  :  DE-AC07-99ID-13727
RP-ID  :  910717

美国|英语

来源: UNT Digital Library

【 摘 要 】

The Advanced Technology Development Program is currently evaluating the performance of the second generation of Lithium-ion cells (i.e., Gen 2 cells). The 18650-size Gen 2 cells consist of a baseline chemistry and one variant chemistry. These cells were distributed over a matrix consisting of three states-of-charge (SOC) (60, 80, and 100% SOC), four temperatures (25, 35, 45, and 55°C), and three life tests (calendar-, cycle-, and accelerated-life). The calendar-life cells are clamped at an opencircuit voltage corresponding to 60% SOC and undergo a once-per-day pulse profile. The cycle-life cells are continuously pulsed using a profile that is centered around 60% SOC. The accelerated-life cells are following the calendar-life test procedures, but using the cycle-life pulse profile. Life testing is interrupted every four weeks for reference performance tests (RPTs), which are used to quantify changes in capacity, resistance, and power. The RPTs consist of a C1/1 and C1/25 static capacity tests, a low-current hybrid pulse power characterization test, and electrochemical impedance spectroscopy at 60% SOC. Capacity-, power-, and electrochemical impedance spectroscopy-based performance results are reported.