Evaluation of the Separation Process for the Production of Electrode Sheets

Jansen, Tobias; Kandula, Maja; Blass, David M.; Hartwig, Sven; Haselrieder, Wolfgang; Dilger, Klaus

doi:10.1002/ente.201900519

Cited by 16 publications

(19 citation statements)

References 19 publications

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“…The relevant material properties of the electrode are the composition of the coating (anode/cathode), collector material, coating thickness, collector thickness, absorption coefficient, and degree of compaction of the electrode (Figure 2). Relevant primary process parameters and material properties of a continuous wave (cw) and pulsed laser cutting process for electrodes [10,12].…”

Section: State Of the Art Laser Cutting Of Electrodesmentioning

confidence: 99%

“…Since the energy density represents the average power input independent of the peak power, the intensity is necessary to further describe the cutting process with a pulsed laser beam (1) Figure 2. Relevant primary process parameters and material properties of a continuous wave (cw) and pulsed laser cutting process for electrodes [10,12].…”

Section: State Of the Art Laser Cutting Of Electrodesmentioning

confidence: 99%

“…Due to the strong reduction of the pulse energy and peak pulse power, the beam could no longer be coupled because of the low absorption of the copper. When cutting copper, it is first heated by the radiation until it oxidizes [10]. As soon as the material oxidizes, the radiation can be much better coupled into the material, and only then leads to the sufficiently high absorption of the laser radiation for a complete cut.…”

Section: Influence Of the Laser Process Parameters On The Cutting Edgmentioning

confidence: 99%

“…Besides the established shearing or die-cutting (DIN 8588) [9], laser cutting is becoming increasingly common in cell production lines due to its process-immanent advantages over the contact-based singulation method [10]. Especially for very thick and fragile electrodes, or pure lithium metal anodes, laser cutting is no longer an alternative but state of the art technology due to the lack of contact and the associated lack of mechanical stress [11].…”

Section: Introductionmentioning

confidence: 99%

“…Laser scanning microscope image of a laser-cut electrode (left); Ablation thresholds depending on the number of hits, intensity, pulse fluence, energy density, as well as the laser-and corresponding plasma-intensity-profile (right): (a) cut-through threshold, (b) ablation threshold, and (c) thermic influencing threshold[10].…”

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confidence: 99%

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Influence of Laser-Generated Cutting Edges on the Electrical Performance of Large Lithium-Ion Pouch Cells

et al. 2019

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Laser cutting is a promising technology for the singulation of conventional and advanced electrodes for lithium-ion batteries. Even though the continuous development of laser sources, beam guiding, and handling systems enable industrial relevant high cycle times, there are still uncertainties regarding the influence of, for this process, typical cutting edge characteristics on the electrochemical performance. To investigate this issue, conventional anodes and cathodes were cut by a pulsed fiber laser with a central emission wavelength of 1059–1065 nm and a pulse duration of 240 ns. Based on investigations considering the pulse repetition frequency, cutting speed, and line energy, a cell setup of anodes and cathodes with different cutting edge characteristics were selected. The experiments on 9 Ah pouch cells demonstrated that the cutting edge of the cathode had a greater impact on the electrochemical performance than the cutting edge of the anode. Furthermore, the results pointed out that on the cathode side, the contamination through metal spatters, generated by the laser current collector interaction, had the largest impact on the electrochemical performance.

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Section: State Of the Art Laser Cutting Of Electrodesmentioning

confidence: 99%

Section: State Of the Art Laser Cutting Of Electrodesmentioning

confidence: 99%

Section: Influence Of the Laser Process Parameters On The Cutting Edgmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Influence of Laser-Generated Cutting Edges on the Electrical Performance of Large Lithium-Ion Pouch Cells

et al. 2019

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The Role of Pilot Lines in Bridging the Gap Between Fundamental Research and Industrial Production for Lithium‐Ion Battery Cells Relevant to Sustainable Electromobility: A Review

2021

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Despite intensive research activities on lithium‐ion technology, particularly in the past five decades, the technological background for automotive lithium‐ion battery mass production in Europe is rather young and not yet ready to meet requirements of automobile manufacturers. In light of the strong increase in electromobility, bridging this gap between fundamental research and industrial production is mandatory to keep the value chain of automobile manufacture in European countries. Challenges in know‐how transfer from lab scale to industry scale arise from different product configurations and objectives. Lab scale focuses primarily on material development and screening, utilizes small‐sized half‐cell or single‐layered designs with one‐side‐coated electrodes, and applies manually operated, discontinuous equipment, whereas industry focuses on optimized trade‐offs between throughput, quality, and costs. Market‐relevant cells contain usually double‐side‐coated electrodes with comparatively higher areal capacities, assembled into multilayered configurations. Mass production is conducted through automated, continuous processes including roll‐to‐roll manufacturing and consecutive pick‐and‐place operations. Inevitably, standard laboratory conditions do not allow for prediction of either optimized mass‐production process parameters nor physicochemical characteristics of final products. Hence, this Review aims to identify challenges in transferring lab‐scale results to industry with special focus on pilot lines as intermediate step between the different technological levels.

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A Perspective on Innovative Drying Methods for Energy‐Efficient Solvent‐Based Production of Lithium‐Ion Battery Electrodes

et al. 2022

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The process step of drying represents one of the most energyintensive steps in the production of lithium-ion batteries (LIBs). [1,2] According to Liu et al., the energy consumption from coating and drying, including solvent recovery, amounts to 46.84% of the total lithium-ion battery production. [3] The starting point for drying battery electrodes on an industrial scale is a wet film of particulate solvent dispersions, which are applied to a current collector foil by slot-die coating. Conventional convective drying removes the solvent from the wet film and solidifies the layer as the drying time progresses (Figure 1). According to the state-of-the-art, electrodes are produced at a web speed of 25-80 m min À1 . [2,[4][5][6][7][8] The deviations in the coating/drying speeds are related to the constant improvement of the system technologies and the different coating thicknesses and types. For example, coatings can be applied intermittently or continuously. [9][10][11] Furthermore, double-sided coatings can be applied simultaneously or sequentially, meaning that the first side is dried first and then the second side. [4,6,7,12] In addition to the actual application methods, parameters such as mass loading and solids content determine the achievable drying rate. Pfleging et al. report typical coating speeds for thick electrodes of 30 m min À1 , whereas Mauler et al. assume that processing speeds of up to 100 m min À1 are realistic in the future. [6,7] However, the influence of the drying intensity on the structure of the electrode must be taken into account. Increasing the drying rate leads to a segregation of binder and carbon black particles contained in the formulation. [13,14] This results in a decrease in binder and carbon black at the interface between the current collector foil and the coating. Jaiser et al. divide the drying process into two different phases. During the first phase, the evaporation of the solvent leads to a shrinkage of the coated layer, the second starts once this shrinkage stops and the solvent is evaporated by capillary transport. The latter phase is mainly responsible for the binder migration. [15] For this reason, drying must be very gentle during this phase. Reducing the drying rate of anode slurries during this stage from 1.19 to 0.52 g m 2 s À1 leads to a 50% increase in adhesive strength. [15] Clearly, an elevation of the drying intensity and the associated production speed is not possible compromising electrode quality. [13,14] Regardless of the electrode parameters, however, throughput can be increased by lengthening the dryer. The difficulty here lies in handling very thin foils, which tend to wrinkle with an increase in dryer length and place new demands on the web tension controls. [4] To be able to increase production speeds and, thus, maximize throughputs, a carefully chosen

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Evaluation of the Separation Process for the Production of Electrode Sheets

Cited by 16 publications

References 19 publications

Influence of Laser-Generated Cutting Edges on the Electrical Performance of Large Lithium-Ion Pouch Cells

Influence of Laser-Generated Cutting Edges on the Electrical Performance of Large Lithium-Ion Pouch Cells

The Role of Pilot Lines in Bridging the Gap Between Fundamental Research and Industrial Production for Lithium‐Ion Battery Cells Relevant to Sustainable Electromobility: A Review

A Perspective on Innovative Drying Methods for Energy‐Efficient Solvent‐Based Production of Lithium‐Ion Battery Electrodes

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