For a full cell, sometimes people use two RC element two represent two charge transfer process of Anode and Cathode. Sometimes a single RC element is used to fit the curve ( as the time constant is close to each other). How can I decide the RC elements for a LFP battery? I use one Series resistance, one RC to represent both charge transfer processes of cathode and anode, one RC to represent to SEI and another CPE to represent the diffusion.
Mostly I have overlapped Charge transfer and SEI processes, the fitting is very random if I use two RC to represent one complete Semicircle(Nyquist plot).
It would be very helpful if someone help me understand the above uncertainities.
Thanks in advance.
It depends on what you are trying to understand. What exactly are you looking for as an output from your measurements ?
Dear Dr. Raam Kasinathan,
I think you can find useful information regarding your question by consulting the following recent paper:
A Review of Different Electric Equivalent Circuit Models and Parameter
Identification Methods of Lithium-Ion Batteries
S. S. Madani, E. Schaltz, S. K. Kær
ECS Transactions 87(1):23-37 (2018)
DOI: 10.1149/08701.0023ecst – Present on ResearchGate
As you said, I only invite you to always consider that each ECC must have a chemical-physical meaning consistent with the system examined.
Best regards, Pierluigi Traverso
I agree with Prasanth Balasubramanian ,
What exactly are you looking to determine? Can you provide more details of the cell structure?
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