Lithium-ion battery degradation indicators via incremental capacity analysis

Abstract

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Analysis of the effect of resistance increase on the capacity fade of lithium ion batteries

“…Incorporating these effects will further improve the fidelity of the model. Increase in resistance at a particular SOC (and correspondingly at a particular OCV) can be computed utilizing techniques such as incremental capacity analysis, and this can be used for obtaining estimates of OCV BOD and OCV EOD , which can in turn be utilized for computing the loss of capacity due to resistance increase alone. The present study also does not delve deeper into the reasons for the decrease of maximum battery capacity with cycling.…”

“…Further, Dubarry et al have recognized that resistance increase is the reason behind the bifurcation of capacity fade and power fade. This resistance increase is observed as a shift in the peaks of the ICA curves …”

“…Dubarry et al have used incremental capacity analysis (ICA) and close to equilibrium open circuit voltage (OCV) measurements to quantify the contributions of loss of active material, undercharging and underdischarging to capacity fade. As the interpretation of various peaks in the ICA analysis is not straightforward, Ansean et al have provided a lookup table to understand the influence of various degradation mechanisms on the peaks of ICA. Dubarry et al further developed a mathematical model to explore the effects of various degradation modes to capacity fade.…”

Anwendung von Batterieanalysemethoden zur Validierung von Alterungsmodellen in Lithium-Ionen-Zellen

“…In heutigen Batteriemanagementsystemen (BMS) wird der Gesundheitszustand (state of health, SOH) ausschließlich über die Gesamtalterung durch den Verlust an nutzbarer Kapazität oder den Anstieg des Zellwiderstandes bestimmt [9][10][11]. Um die Degradation einer Batteriezelle genauer zu analysieren, existieren verschiedene Alterungsmodelle, um die Schädigungseffekte auf die einzelnen Komponenten der Batterie zurückzuführen [12][13][14][15][16][17][18][19][20]. [8,15].…”

“…Für eine genauere Untersuchung der Ursachen, werden sämtliche Schädigungseffekte häufig in drei getrennte Alterungsmechanismen unterteilt. Diese drei Untergruppen werden aus den Verlusten der Leitfähigkeit (CL), des Lithiuminventars (LLI) und des Aktivmaterials der Elektroden (LAM) gebildet[12][13][14][15][16][17]20]. Typische Schädigungseffekte, welche innerhalb einer Batteriezelle auftreten, werden in Abbildung 1 dargestellt und farblich zu den drei übergeordneten Alterungsmechanismen zugeordnet.…”