Introduction to Electrochemical Impedance Spectroscopy as a Measurement Method for the Wetting Degree of Lithium-Ion Cells

Günter, Florian J.; Habedank, Jan Bernd; Schreiner, David; Neuwirth, Tobias; Gilles, Ralph; Reinhart, Gunther

doi:10.1149/2.0081814jes

Cited by 87 publications

(73 citation statements)

References 28 publications

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“…The experimental setup for the pouch cells is similar to the one described in the study by Günter et al For article conciseness, only the experimental setup for the PHEV1 cells is described in this study.…”

Section: Methodsmentioning

confidence: 99%

“…The filling of cavities, as inner surfaces of the media, can be described as microscopic wetting, whereas the wetting of (macroscopic) surfaces can be regarded as superficial wetting. The former can be measured using electrochemical impedance spectroscopy, and the latter can be visualized by neutron radiography (NR). Knoche et al visualized the filling process in operando for the first time by NR.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the Cell Format on the Electrolyte Filling Process of Lithium‐Ion Cells

et al. 2019

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During the production process of lithium‐ion battery cells, the filling, which consists of dosing and wetting steps, of the cell and its components with an electrolyte liquid is important for the quality and costs of the final product. The cell format as a combination of housing and cell arrangement not only determines the type of filling process but also influences the distribution of the electrolyte within the cell. The cell format also has an influence on the wetting state as a function of time. Herein, in situ neutron radiography is used to analyze the filling process of two different cell types – pouch cells with a z‐folded stack and hardcase cells with a flat wound roll. The results are then analyzed and transferred to other common cell formats to identify a fillable cell design and format‐dependent process improvement possibilities to enable faster processing.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of the Cell Format on the Electrolyte Filling Process of Lithium‐Ion Cells

et al. 2019

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“…16 This generates a spatial tortuosity anisotropy and creates particularly long diffusion pathways d path through the electrode. 17 Among many other parameters, 18 the ionic resistance within LIB electrodes can be assessed in situ by measuring the cell impedance using electrochemical impedance spectroscopy (EIS), 19 enabling a calculation of the tortuosity. 12 By measuring the impedance of cells at different states of charge (SOC) and temperatures, conclusions concerning the kinetics of lithium ions within the electrodes can be drawn.…”

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confidence: 99%

Enhanced Fast Charging and Reduced Lithium-Plating by Laser-Structured Anodes for Lithium-Ion Batteries

Habedank

Kriegler

Zaeh

2019

J. Electrochem. Soc.

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Within this paper we report on a lithium-ion battery with laser-structured graphite anodes, alleviating current drawbacks of lithiumion batteries such as the reduced discharge capacity at high Crates and the onset of lithium-plating during fast charging. These issues are intensified at low temperatures, as reaction and diffusion kinetics decelerate, which is why a focus of the presented work lies on low temperature performance. Electrochemical impedance spectroscopy was used to show a reduction in the impedances of cells with laser-structured anodes in comparison to their conventional counterparts. The discharge capacity retention at high Crates was enhanced by up to 27% compared to conventional cells, proving potential for high power applications. For the cells with laserstructured anodes, the onset of lithium-plating at 0°C was observed at higher charging Crates by analyzing the voltage relaxation after charging. At −15°C, a smaller amount of plated lithium was detected, even though lithium-plating could not be entirely avoided. Laser structuring also enabled shorter charging times, as the upper cutoff voltage was reached at a higher SOC. The results point out that laser structuring of the anode improves the fast charging capability of lithium-ion cells, especially under demanding operating conditions.

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Section: Electrochemical Detection Of Pamentioning

confidence: 99%

Emerging Technologies for the Electrochemical Detection of Bacteria

McEachern

Harvey

Merle

2020

Biotechnology Journal

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Infections are a huge economic liability to the health care system, although real‐time detection can allow early treatment protocols to avoid some of this cost and patient morbidity and mortality. Pseudomonas aeruginosa (PA) is a drug‐resistant gram‐negative bacterium found ubiquitously in clinical settings, accounting for up to 27% of hospital acquired infections. PA secretes a vast array of molecules, ranging from secondary metabolites to quorum sensing molecules, of which many can be exploited to monitor bacterial presence. In addition to electrochemical immunoassays to sense bacteria via antigen–antibody interactions, PA pertains a distinct redox‐active virulence factor called pyocyanin (PYO), allowing a direct electrochemical detection of the bacteria. There has been a surge of publications relating to the electrochemical tracing of PA via a myriad of novel biosensing techniques, materials, and methodologies. In addition to indirect methods, research approaches where PYO has been sensitively detected using surface modified electrodes are reviewed and compared with conventional PA‐sensing methodologies. This review aims at presenting indirect and direct electrochemical methods currently developed using various surface modified electrodes, materials, and electrochemical configurations on their electrocatalytic effects on sensing of PA and in particular PYO.

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Introduction to Electrochemical Impedance Spectroscopy as a Measurement Method for the Wetting Degree of Lithium-Ion Cells

Cited by 87 publications

References 28 publications

Influence of the Cell Format on the Electrolyte Filling Process of Lithium‐Ion Cells

Influence of the Cell Format on the Electrolyte Filling Process of Lithium‐Ion Cells

Enhanced Fast Charging and Reduced Lithium-Plating by Laser-Structured Anodes for Lithium-Ion Batteries

Emerging Technologies for the Electrochemical Detection of Bacteria

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