The effect of web tension on calendering wrinkles and corrugations of coated foils

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The effect of web tension on calendering wrinkles and corrugations of coated foils

FU Zejun, XU Zhutian, PENG Linfa

Abstract. Lithium-ion batteries have been widely used in energy storage for a range of applications from portable electronics, electric vehicles to power grids due to their high energy density, high power density and long cycle life. Calendering is a critical process in the manufacturing of lithium-ion batteries electrodes, which has a significant influence on volumetric energy density, long-term cycle stability, and electrochemical performance of lithium-ion batteries, etc. Wrinkles in the uncoated area and corrugations in the coated area of the electrode during the calendering process are serious problems in the industrial production of lithium-ion batteries, as shown in Fig. 1. Adjusting the web tensions has been a critical solution to mitigate these defects. However, large web tensions often lead to foil tearing, severe wrinkles, and high scrap rates, due to a lack of understanding of the wrinkling and corrugating behavior under different tension conditions. To cope with that, this stuedy aims to investigate the mechanism of wrinkling and the effect of web tension on the wrinkling of electrodes during calendering. Calendering experiments are carried out for lithium battery cathodes under different front and back tensions and the three-dimensional topographies of calendered electrodes are measured by a laser profiler. The corrugations of electrodes can be improved by the difference between the front and back tension, instead of the magnitude of the tension, and the tortuosity is reduced by 34.2% at a tension difference of 20 N, compared to that of 5 N. An increase of the tension difference leads to a linear increase of shear displacement δ, causing severe wrinkles in the uncoated area of electrodes. An analytical prediction model for the wrinkles during calendering is established based on shearing of the rectangular membrane and an electrode quality evaluation method for balancing wrinkles and corrugations is proposed. The determination of optimal web tension settings, with a tension difference of 17 N, is achieved to obtain the best quality calendered electrodes, which is in agreement with the experimental results. The method presented in this paper is helpful for the improvement of the production quality and efficiency of lithium battery electrodes.

Keywords
Lithium-Ion Batteries, Calendering Process, Wrinkles, Corrugations, Web Tension, Analytical Modelling

Published online 9/15/2024, 15 pages
Copyright © 2024 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: FU Zejun, XU Zhutian, PENG Linfa, The effect of web tension on calendering wrinkles and corrugations of coated foils, Materials Research Proceedings, Vol. 44, pp 305-319, 2024

DOI: https://doi.org/10.21741/9781644903254-33

The article was published as article 33 of the book Metal Forming 2024

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

References
[1] W.B. Hawley, J. Li, Electrode manufacturing for lithium-ion batteries—Analysis of current and next generation processing, J. Energy Storage 25 (2019) 100862. https://doi.org/10.1016/j.est.2019.100862
[2] J. Li, J. Fleetwood, W.B. Hawley, W. Kays, From Materials to Cell: State-of-the-Art and Prospective Technologies for Lithium-Ion Battery Electrode Processing, Chem. Rev. 122 (2022) 903-56. https://doi.org/10.1021/acs.chemrev.1c00565
[3] J. Xiao, F. Shi, T. Glossmann, C. Burnett, Z. Liu, From laboratory innovations to materials manufacturing for lithium-based batteries, Nat. Energy 8 (2023) 329-339. https://doi.org/10.1038/s41560-023-01221-y
[4] J. Li, Z. Du, R.E. Ruther, S. Jin, L.A. David, K. Hays, M. Wood, N.D. Phillip, Y. Sheng, C. Mao, S. Kalnaus, C. Daniel, D.L. Wood III, Toward Low-Cost, High-Energy Density, and High-Power Density Lithium-Ion Batteries, JOM 69 (2017) 1484-1496. https://doi.org/10.1007/s11837-017-2404-9
[5] Y. Liu, R. Zhang, J. Wang, Y. Wang, Current and future lithium-ion battery manufacturing, iScience 14 (2021) 102332. https://doi.org/10.1016/j.isci.2021.102332
[6] X.K. Lu, S.R. Daemi, A. Bertei, M.D.R. Kok, K.B. O’Regan, L. Rasha, J. Park, G. Hinds, E. Kendrick, D.J.L. Brett, P.R. Shearing, Microstructural Evolution of Battery Electrodes During Calendering, Joule 4 (2020) 2746-2768. https://doi.org/10.1016/j.joule.2020.10.010
[7] H.X. Kang, C. Lim, T.Y. Li, Y. Fu, B. Yan, N. Houston, V. de Andrade, F. de Carlo, L. Zhu, Geometric and Electrochemical Characteristics of LiNi1/3Mn1/3Co1/3O2 Electrode with Different Calendering Conditions, Electrochim. Acta 232 (2017) 431-438. https://doi.org/10.1016/j.electacta.2017.02.151
[8] R. Sim, S. Lee, W.D. Li, A. Manthiram, Influence of Calendering on the Electrochemical Performance of LiNi0.9Mn0.05Al0.05O2 Cathodes in Lithium-Ion Cells, ACS Appl. Mater. Interfaces 13 (2021) 42898-42908. https://doi.org/10.1021/acsami.1c12543
[9] J. Zhu, W. Li, T. Wierzbicki, Y. Xia, J. Harding, Deformation and failure of lithium-ion batteries treated as a discrete layered structure, Int. J. Plast. 121 (2019) 293-311. https://doi.org/10.1016/j.ijplas.2019.06.011
[10] A. Kwade, W. Haselrieder, R. Leithoff, A. Modlinger, F. Dietrich, K. Droeder, Current status and challenges for automotive battery production technologies, Nat. Energy 3 (2018) 290-300. https://doi.org/10.1038/s41560-018-0130-3
[11] D.L. Wood, J. Li, C. Daniel, Prospects for reducing the processing cost of lithium ion batteries, J. Power Sources 275 (2015) 234-242. https://doi.org/10.1016/j.jpowsour.2014.11.019
[12] T. Guenther, D. Schreiner, A. Metkar, C. Meyer, Classification of Calendering-Induced Electrode Defects and Their Influence on Subsequent Processes of Lithium-Ion Battery Production, Energy Technol. 8 (2020). https://doi.org/10.1002/ente.201900026
[13] D. Mayer, A.-K. Wurba, B. Bold, J. Bernecker, A. Smith, J. Fleischer, Investigation of the Mechanical Behavior of Electrodes after Calendering and Its Influence on Singulation and Cell Performance, Processes 9 (2021). https://doi.org/10.3390/pr9112009
[14] D. Mayer, J. Fleischer, Concept for modelling the influence of electrode corrugation after calendering on stacking accuracy in battery cell production, Procedia CIRP 104 (2021) 744-749. https://doi.org/10.1016/j.procir.2021.11.125
[15] A. Mayr, D. Schreiner, B. Stumper, R. Daub, In-line Sensor-based Process Control of the Calendering Process for Lithium-Ion Batteries, Procedia CIRP 107 (2022) 295-301. https://doi.org/10.1016/j.procir.2022.04.048
[16] D. Schreiner, M. Oguntke, T. Günther, G. Reinhart, Modelling of the Calendering Process of NMC-622 Cathodes in Battery Production Analyzing Machine/Material–Process–Structure Correlations, Energy Technol. 7 (2019) 1900840. https://doi.org/10.1002/ente.201900840
[17] D. Schreiner, T. Zünd, F.J. Günter, L. Kraft, B. Stumper, F. Linsenmann, M. Schüßler, R. Wilhelm, A. Jossen, G. Reinhart, H.A. Gasteiger, Comparative Evaluation of LMR-NCM and NCA Cathode Active Materials in Multilayer Lithium-Ion Pouch Cells: Part I. Production, Electrode Characterization, and Formation, J. Electrochem. Soc. 168 (2021) 030507. https://doi.org/10.1149/1945-7111/abe50c
[18] E.N. Primo, M. Chouchane, M. Touzin, P. Vazquez, A.A. Franco, Understanding the calendering processability of Li(Ni0.33Mn0.33Co0.33)O2-based cathodes, J. Power Sources 488 (2021) 229361. https://doi.org/10.1016/j.jpowsour.2020.229361
[19] E.N. Primo, M. Touzin, A.A. Franco, Calendering of Li(Ni0.33Mn0.33Co0.33)O2-Based Cathodes: Analyzing the Link Between Process Parameters and Electrode Properties by Advanced Statistics, Batteries & Supercaps 4 (2021) 834-844. https://doi.org/10.1002/batt.202000324
[20] A. Diener, S. Ivanov, W. Haselrieder, A. Kwade, Evaluation of Deformation Behavior and Fast Elastic Recovery of Lithium-Ion Battery Cathodes via Direct Roll-Gap Detection During Calendering, Energy Technol. 10 (2022). https://doi.org/10.1002/ente.202101033
[21] C. Zhang, S. Santhanagopalan, M.A. Sprague, A.A. Pesaran, Coupled mechanical-electrical-thermal modeling for short-circuit prediction in a lithium-ion cell under mechanical abuse, J. Power Sources 290 (2015) 102-113. https://doi.org/10.1016/j.jpowsour.2015.04.162
[22] C. Zhang, J. Xu, L. Cao, Z. Wu, Constitutive behavior and progressive mechanical failure of electrodes in lithium-ion batteries, J. Power Sources 357 (2017) 126-137. https://doi.org/10.1016/j.jpowsour.2017.04.103
[23] P. Gupta, İ.B. Üçel, P. Gudmundson, E. Olsson, Characterization of the Constitutive Behavior of a Cathode Active Layer in Lithium-Ion Batteries Using a Bending Test Method, Exp. Mech. 60 (2020) 847-860. https://doi.org/10.1007/s11340-020-00613-5
[24] C. Meyer, H. Bockholt, W. Haselrieder, A. Kwade, Characterization of the calendering process for compaction of electrodes for lithium-ion batteries, J. Mater. Process. Technol. 249 (2017) 172-178. https://doi.org/10.1016/j.jmatprotec.2017.05.031
[25] C. Meyer, M. Kosfeld, W. Haselrieder, A. Kwade, Process modeling of the electrode calendering of lithium-ion batteries regarding variation of cathode active materials and mass loadings, J. Energy Storage 18 (2018) 371-379. https://doi.org/10.1016/j.est.2018.05.018
[26] J. Zhu, W. Li, Y. Xia, E. Sahraei, Testing and Modeling the Mechanical Properties of the Granular Materials of Graphite Anode, J. Electrochem. Soc. 165 (2018) A1160-A1168. https://doi.org/10.1149/2.0141807jes
[27] E. Sahraei, R. Hill, T. Wierzbicki, Calibration and finite element simulation of pouch lithium-ion batteries for mechanical integrity, J. Power Sources 201 (2012) 307-321. https://doi.org/10.1016/j.jpowsour.2011.10.094
[28] E. Sahraei, E. Bosco, B. Dixon, B. Lai, Microscale failure mechanisms leading to internal short circuit in Li-ion batteries under complex loading scenarios, J. Power Sources 319 (2016) 56-65. https://doi.org/10.1016/j.jpowsour.2016.04.005
[29] D. Schreiner, A. Klinger, G. Reinhart, Modeling of the Calendering Process for Lithium-Ion Batteries with DEM Simulation, Procedia CIRP 93 (2020) 149-155. https://doi.org/10.1016/j.procir.2020.05.158
[30] R. Ge, A.M. Boyce, Y. Shui Zhang, P.R. Shearing, D.J. Cumming, R.M. Smith, Discrete element method and electrochemical modelling of lithium ion cathode structures characterised by X-ray computed tomography, Chemical Eng. J. 465 (2023) 142749. https://doi.org/10.1016/j.cej.2023.142749
[31] A. Lundkvist, P.-L. Larsson, E. Olsson, A discrete element analysis of the mechanical behaviour of a lithium-ion battery electrode active layer, Powder Technol. 425 (2023) 118574. https://doi.org/10.1016/j.powtec.2023.118574
[32] C. Sangrós Giménez, B. Finke, C. Nowak, et al. Structural and mechanical characterization of lithium-ion battery electrodes via DEM simulations, Adv. Powder Technol. 29 (2018) 2312-2321. https://doi.org/10.1016/j.apt.2018.05.014
[33] A.C. Ngandjong, T. Lombardo, E.N. Primo, M. Chouchane, A. Shodiev, O. Arcelus, A.A. Franco, Investigating electrode calendering and its impact on electrochemical performance by means of a new discrete element method model: Towards a digital twin of Li-Ion battery manufacturing, J. Power Sources 485 (2021) 229320. https://doi.org/10.1016/j.jpowsour.2020.229320
[34] D. Mayer, B. Schwab, J. Fleischer, Influence of Electrode Corrugation after Calendering on the Geometry of Single Electrode Sheets in Battery Cell Production, Energy Technol. 11 (2023) 2200870. https://doi.org/10.1002/ente.202200870
[35] C.G. Wang, H.F. Tan, X.W. Du, Z.M. Wan, Wrinkling prediction of rectangular shell-membrane under transverse in-plane displacement, Int. J. Solids Struct. 44 (2007) 6507-6516. https://doi.org/10.1016/j.ijsolstr.2007.02.036