Rapid electrolyte wetting of lithium-ion batteries containing laser structured electrodes: in situ visualization by neutron radiography

Habedank, Jan Bernd; Günter, Florian J.; Billot, N.; Gilles, Ralph; Neuwirth, Tobias; Reinhart, Gunther; Zaeh, Michael F.

doi:10.1007/s00170-019-03347-4

Cited by 78 publications

(85 citation statements)

References 21 publications

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“…A remedy can be the structuring of electrodes. Significant improvements in wetting have been achieved by means of laser structuring . Nonwetted areas due to closed surface pores can impair the formation of the cell because locally higher resistances and ultimately lithium plating are to be expected .…”

Section: Resultsmentioning

confidence: 99%

Classification of Calendering‐Induced Electrode Defects and Their Influence on Subsequent Processes of Lithium‐Ion Battery Production

et al. 2019

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The production of lithium‐ion cells consists of a series of highly interlinked process steps. Calendering, as the last step of electrode manufacturing, has a significant impact on electrode characteristics. The process primarily aims at enhancing the electrode energy density and hereinafter, minimizing the plastic deformability, improving the conductivity, and determining the pore structure of the electrode. So far, electrode characteristics are mainly investigated regarding the impact on cell quality. However, they also affect their subsequent processabilities in the process chain, which is crucial for cost improvement, for example, by reduction of scrap rates. Herein, a methodical identification, description, and categorization of electrode characteristics is conducted based on a literature review, an expert survey, and operating experience. The methodical classification will provide a basis for the modeling of the interaction between the influencing factors (product properties, process parameters, and machine characteristics) and electrode characteristics during calendering.

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Section: Resultsmentioning

confidence: 99%

Classification of Calendering‐Induced Electrode Defects and Their Influence on Subsequent Processes of Lithium‐Ion Battery Production

et al. 2019

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“…The tighter particle structure can be attributed to the mechanical stresses applied during the compaction process which lead to a rearrangement of the particles . The porosity determined during calendering strongly affects the wetting behavior and thus the wetting time of the electrode …”

Section: Introductionmentioning

confidence: 99%

Modelling of the Calendering Process of NMC‐622 Cathodes in Battery Production Analyzing Machine/Material–Process–Structure Correlations

et al. 2019

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The shift in the transport sector from internal combustion engines to battery‐powered electric vehicles and the continued demand for portable applications increases the need for batteries in the coming years. To optimize battery technologies, it is essential to fully understand the production process and the associated parameters as well as their influence on the chemical processes within the cell. At the Institute for Machine Tools and Industrial Management (iwb), extensive knowledge of the calendering process is gathered including the investigation of the displacement behavior for both the calender rolls and the bearing, as well as the adhesion strength. The process parameters such as roll temperature and velocity, structure parameters (e. g., coating thickness, adhesion strength), and machine behavior parameters (displacement and bending line) are investigated using three calender models. The achieved porosities are verified via porosity consistency measurements. Based on the collected data, qualitative machine/material–process–structure models are built up. Scanning electron microscopy (SEM) and light microscopy support the relations made. In addition, a connection between vertical displacement and line load is established.

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“…Weydanz et al showed that filling the electrolyte under vacuum down to 100 mbar accelerates this production step significantly. Habedank et al even achieved 12 times faster wetting by laser structuring of the electrodes, which additionally improves the C‐rate behavior . The wetting state is defined as the surfaces and cavities of electrodes and separators wetted and saturated with electrolyte compared with the total surfaces and cavities of the cell assembly.…”

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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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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Rapid electrolyte wetting of lithium-ion batteries containing laser structured electrodes: in situ visualization by neutron radiography

Cited by 78 publications

References 21 publications

Classification of Calendering‐Induced Electrode Defects and Their Influence on Subsequent Processes of Lithium‐Ion Battery Production

Classification of Calendering‐Induced Electrode Defects and Their Influence on Subsequent Processes of Lithium‐Ion Battery Production

Modelling of the Calendering Process of NMC‐622 Cathodes in Battery Production Analyzing Machine/Material–Process–Structure Correlations

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

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