Mechanical impedance as a tool for electromechanical investigation and equivalent modeling of lithium-ion batteries

Kessel, Otto von; Deich, Tobias; Hahn, Severin; Brauchle, Felix; Vranković, Dragoljub; Soczka‐Guth, Thomas; Birke, Kai Peter

doi:10.1016/j.jpowsour.2021.230337

Cited by 14 publications

(13 citation statements)

References 51 publications

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“…3. The principal setup is very similar to the press presented in our previous publications, 17,21,46 but some modifications in hardware design were made:…”

Section: Methodsmentioning

confidence: 99%

“…The chosen mechanical parameterization in the mentioned studies seems to not always consider the state-of-charge (SoC) or pressure-dependence of battery electrode's compressive properties that are reported in the literature. 2,15,16,[44][45][46] However, silicon electrodes in particular heavily change their mechanical structure upon lithiation. This happens because the volumetric share of the active material within the electrode changes upon active material expansion, 31 and due to SoC-dependent mechanical active material properties.…”

Section: List Of Symbolsmentioning

confidence: 99%

“…The inactive compounds may be neglected if the cell has many layers. Pressure, 17,46 strain-rate, 46,68 layer number 15,67,69 and SoC dependence [44][45][46]70,71 of the mechanical properties of battery cells and their components are accommodated within the parameterization measurements and thus not modeled specifically.…”

Section: Layersmentioning

confidence: 99%

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Electrochemical-Mechanical Parameterization and Modeling of Expansion, Pressure, and Porosity Evolution in NMC811∣SiOx-Graphite Lithium-Ion Cells

von Kessel,

Hoehl,

Heugel

et al. 2023

J. Electrochem. Soc.

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Mechanical changes in active materials with large volume expansion such as silicon and nickel not only affect the electrochemical performance of modern batteries but also pose a great challenge to their mechanical design due to pressure increase during operation. We show that the large expansion and consequently changing mechanical properties of silicon and nickel strongly affect the electrochemical and mechanical performance. A multi-scale electrochemical model is developed, parameterized, and validated for a pouch cell with a SiOx-graphite anode (22 wt.-% SiOx) and an NMC|811 cathode. Mechanical parameters such as expansion and compressive properties are determined experimentally using an in-house-developed high-precision cell press and electrode dilatometer, thus parameterizing a semi-empirical mechanical model. We employ a new characterization technique to measure mechanical changes in the cell in-operando and propose a phenomenological parameterization where physical modeling is not yet sufficient. Through electrode porosity, we show that mechanical and electrochemical performance are interdependent, as the latter is reduced upon expansion and pressure development. On the one hand, the active material of the anode seems to expand into the pores at increased pressure, and on the other hand, the mechanical deformation of the cell components can no longer be neglected.

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“…3. The principal setup is very similar to the press presented in our previous publications, 17,21,46 but some modifications in hardware design were made:…”

Section: Methodsmentioning

confidence: 99%

Section: List Of Symbolsmentioning

confidence: 99%

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Electrochemical-Mechanical Parameterization and Modeling of Expansion, Pressure, and Porosity Evolution in NMC811∣SiOx-Graphite Lithium-Ion Cells

von Kessel,

Hoehl,

Heugel

et al. 2023

J. Electrochem. Soc.

Self Cite

View full text Add to dashboard Cite

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“…For further understanding, the reader is referred to reviews and papers on these topics. [4,[19][20][21][22][23]…”

Section: Theorymentioning

confidence: 99%

“…We will only cover these basics briefly. For further understanding, the reader is referred to reviews and papers on these topics [4,19–23] …”

Section: Theorymentioning

confidence: 99%

An Experimental Method to Determine the Measurement Error of Reference Electrodes within Lithium‐Ion Batteries

et al. 2023

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Reference electrodes (REs) play a crucial role in the accurate assessment and control of battery potentials, but their confidence is overestimated. Researchers have tracked the source of the error to the RE design that blocks the lithium‐ion path between anode and cathode. These errors or potential deviations are mostly modeled or less‐frequently estimated after observing Li plating post‐mortem. This is the first study to showcase an experimental method that allows a more precise error quantification in‐operando of a RE. The key idea is to relate the error‐affected reference potential to an unaffected quantity, such as the cell dilatation. Although our experimental setups are special, this approach can also be applied to different setups and REs. Using the presented method, we provoked Li plating in NMC811/graphite pouch cells and determined the potential deviation of our perforated RE to be 12 mV under fast charging conditions. In contrast to previous studies, we found the error to be positive, offering a new explanation of the error mechanism of REs.

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Deciphering Advanced Sensors for Life and Safety Monitoring of Lithium Batteries

Wang,

Zhang,

Xie

et al. 2024

Advanced Energy Materials

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The rapid commercialization of lithium batteries greatly promotes the development of the electric vehicles, renewable energy storage systems and consumer electronics. The service lifetime and safety of lithium batteries are extremely concerned by terminal customers. Sensor technology is powerful in monitoring the physical and chemical signals of lithium batteries, serving for the state of health and safety warning/evaluation of lithium batteries and guide for future development of battery materials. In this review, the primary concern is the generation mechanisms of different physicochemical signals in lithium batteries. Then, the sensing methods and sensing designs according to different physicochemical signals of lithium batteries is summarized. Finally, some perspectives are provided to guide further development of sensing technology for lithium batteries. This review will greatly accelerate the terminal application of advanced sensors, whether in commercial products or scientific research.

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Mechanical impedance as a tool for electromechanical investigation and equivalent modeling of lithium-ion batteries

Cited by 14 publications

References 51 publications

Electrochemical-Mechanical Parameterization and Modeling of Expansion, Pressure, and Porosity Evolution in NMC811∣SiOx-Graphite Lithium-Ion Cells

Electrochemical-Mechanical Parameterization and Modeling of Expansion, Pressure, and Porosity Evolution in NMC811∣SiOx-Graphite Lithium-Ion Cells

An Experimental Method to Determine the Measurement Error of Reference Electrodes within Lithium‐Ion Batteries

Deciphering Advanced Sensors for Life and Safety Monitoring of Lithium Batteries

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