Electrochemical impedance spectroscopy study of commercial Li-ion phosphate batteries: A metrology perspective

被引:30
作者
Deleebeeck, Lisa [1 ]
Veltze, Sune [1 ]
机构
[1] DFM AS, Danish Natl Metrol Inst, Electrochem Grp, Horsholm, Denmark
关键词
aging studies; electrochemical impedance spectroscopy; Li-ion batteries; state of charge; state of health; temperature; INTERNAL TEMPERATURE; ELECTRIC VEHICLES; POSTMORTEM ANALYSIS; EQUIVALENT-CIRCUIT; RELAXATION-TIMES; STATE; CHARGE; HEALTH; CELLS; DISCHARGE;
D O I
10.1002/er.5350
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
A single-production batch of commercial LiFePO4-graphite Li-ion batteries (2.5 Ah) were investigated using electrochemical impedance spectroscopy (EIS). Four batches, consisting of three cells each, were cycled between 100% and 0% state of charge (SoC), with EIS measurements acquired between 90% and 20% SoC. Cell batches were initially investigated at 25 degrees C, stressing the importance of repeatability, reproducibility, careful selection of AC perturbation type and amplitude, frequency range and the need for data quality checks (eg, through calculation of Kramers-Kronig residuals). Cells were (a) calendar, and (b) cycle aged at 0 degrees C, 25 degrees C and 40 degrees C. Data are presented as Nyquist plots, analyzed by distribution of relaxation time analysis, and fitted using a proposed equivalent circuit. The available literature was evaluated to provide the best experimental parameters for reliable data acquisition. This further provided comments on issues worth considering prior to embarking on an EIS-based calendar or cycle aging study of commercial Li-ion batteries. The need for a metrological foundation to such measurements is stressed. This work provides a number of starting-point parameters for newcomers to these types of investigations.
引用
收藏
页码:7158 / 7182
页数:25
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