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Validity of solid-state Li$^+$ diffusion coefficient estimation by electrochemical approaches for lithium-ion batteries.
TL;DR: In this article, the authors investigated the validity of galvanostatic intermittent titration (GITT) and a faster alternative technique, intermittent current interruption (ICI), through a black-box testing approach.
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Abstract: The solid-state diffusion coefficient of the electrode active material is one of the key parameters in lithium-ion battery modelling. Conventionally, this diffusion coefficient is estimated through the galvanostatic intermittent titration technique (GITT). In this work, the validity of GITT and a faster alternative technique, intermittent current interruption (ICI), are investigated regarding their effectiveness through a black-box testing approach. A Doyle-Fuller-Newman model with parameters for a LiNi$_{0.8}$Mn$_{0.1}$Co$_{0.1}$O$_2$ electrode is used as a fairly faithful representation as a real battery system, and the GITT and ICI experiments are simulated to extract the diffusion coefficient. With the parameters used in this work, the results show that both the GITT and ICI methods can identify the solid-state diffusion coefficient very well compared to the value used as input into the simulation model. The ICI method allows more frequent measurement but the experiment time is 85% less than what takes to perform a GITT test. Different fitting approaches and fitting length affected the estimation accuracy, however not significantly. Moreover, a thinner electrode, a higher C-rate and a greater electrolyte diffusion coefficient will lead to an estimation of a higher solid-state diffusion coefficient, generally closer to the target value.
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Citations
Rapid determination of solid-state diffusion coefficients in Li-based batteries via intermittent current interruption method
Yu-Chuan Chien,Haidong Liu,Ashok Sreekumar Menon,William R. Brant,Daniel Brandell,Matthew J. Lacey +5 more
TL;DR: In this paper , the authors proposed the intermittent current interruption (ICI) method as a reliable, accurate and faster alternative to GITT-based methods for determining the Li + diffusion coefficients in insertion electrode materials.
Re-understanding the galvanostatic intermittent titration technique: Pitfalls in evaluation of diffusion coefficients and rational suggestions
TL;DR: In this article , the authors formulated the standards for the above issues, and analyzed the assumptions under different conditions to improve the accuracy of the chemical diffusion coefficient (D) test results and new methods derived from GITT are rationally integrated.
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State of charge estimation of lithium-ion batteries based on second-order adaptive extended Kalman filter with correspondence analysis
TL;DR: In this paper , an adaptive extended Kalman filter (AEKF) is used to estimate the state of charge (SOC) of a lithium-ion battery, which approximates nonlinear function to linear function by first-order Taylor expansion with large truncation error.
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Ageing of High Energy Density Automotive Li-Ion Batteries: The Effect of Temperature and State-of-Charge
A. E. Mikheenkova,Alexander James Smith,Kristian Bartholdsson Frenander,Yonas Tesfamhret,Niladri Roy Chowdhury,Cheuk-Wai Tai,Torbjorn Thiringer,Rakel Wreland Lindström,Maria Hahlin,Matthew J. Lacey +9 more
TL;DR: This study investigates the ageing of high-energy density automotive Li-ion batteries, revealing that lithium inventory loss is the primary degradation mode, influenced by temperature and state-of-charge, particularly at low SoC and high temperatures.
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Regulating the kinetics of zinc-ion migration in spinel ZnMn2O4 through iron doping boosted aqueous zinc-ion storage performance.
TL;DR: In this paper , ZnMn2O4 mesoporous hollow microspheres with metal ion doping were prepared by a simple spray pyrolysis method and applied to the cathode of aqueous zinc ion battery.
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