期刊
CURRENT OPINION IN ELECTROCHEMISTRY
卷 34, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.coelec.2022.100986
关键词
Electrochemical model; Diffusion coefficient; Exchange current density; GITT; PITT; EIS
资金
- R&D Program (Development of fire safety improvement technology for ESS (Li-ion battery)) [PK2102A1]
- Korea Railroad Research Institute (KRRI) [PK2102A1]
- Korea Electrotechnology Research Institute (KERI) Primary research program through the National Research Council of Science & Technology (NST) - Ministry of Science and ICT (MSIT) [PK2102A1]
- DGIST Supercomputing
- Bigdata Center
- [21A01012]
- National Research Council of Science & Technology (NST), Republic of Korea [PK2102A1] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The diffusion coefficient and exchange current density are key parameters that determine the electrochemical characteristics of an electrochemical battery model. This study measured these parameters for a LiNi0.4Mn0.3Co0.3O2/Li cell using four different electrochemical methods and applied them to the electrochemical model. The results show that the model using the parameters measured by different methods can accurately simulate the voltage-capacity profiles.
The diffusion coefficient and exchange current density are the two dominant parameters that determine the electrochemical characteristics of the electrochemical battery model. Nevertheless, both parameter values are generally adopted from well-known literature or experimental data measured under limited conditions and are sometimes overfitted to match actual electrochemical behaviors without full consideration. Herein, the diffusion coefficients and exchange current densities of a LiNi0.4Mn0.3Co0.3O2/Li cell are measured and applied to the electrochemical model (based on Newman's model) using four different electrochemical methods: galvanostatic intermittent titration technique (GITT), potentiostatic intermittent titration technique (PITT), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV). Without any fitting, the model adopting the diffusion coefficient and exchange current density measured from PITT and EIS, respectively, simulates the actual voltage-capacity profiles well. Thus, this case study provides a valuable opportunity to understand the advantages and disadvantages of each measurement method in obtaining key experimental parameters for electrochemical battery models.
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