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Numerical and experimental investigation on formation of the film for different die lip configurations in lithium-ion battery electrode slot-die coating

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Abstract

The slot-die coating is the most commonly used manufacturing method for producing lithium-ion battery electrodes. However, how to achieve high surface consistency for electrodes still confronts one challenge. In this research, the slot coating processes with different die lip configurations were carefully investigated using numerical and experimental methods. The motion pattern, internal flow structure of the coating bead, and coating uniformity were explored during the coating process of lithium battery cathode slurry. The low-flow limit at different coating gaps was also determined by combining the viscous capillary model and numerical methods, which was in good agreement with experimental results. The results showed that a smaller coating gap controlling the upstream meniscus between the upstream die lip and slot exit was favorable to the coating uniformity. For the same thickness films, a larger coating gap was apt to increase formation of edge defects. However, the coating speed had little effect on the edge height. The evolution of flow structure for the coating bead (parabolic–sharp angle–diagonal) under different processes was investigated by tracking the particle trajectories during the coating process. It can provide theoretical guidance for the fabrication of high-quality electrodes.

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References

  1. Creel, EB, Tjiptowidjojo, K, Lee, JA, et al. “Slot-Die-Coating Operability Windows for Polymer Electrolyte Membrane Fuel Cell Cathode Catalyst Layers.” J. Colloid Interface Sci., 610 474–485 (2022)

    Article  ADS  CAS  PubMed  Google Scholar 

  2. Ding, X, Liu, J, Harris, TAL, “A Review of the Operating Limits in Slot Die Coating Processes.” AICHE J., 62 (7) 2508–2524 (2016)

    Article  ADS  CAS  Google Scholar 

  3. Mohanty, D, Hockaday, E, Li, J, et al. “Effect of Electrode Manufacturing Defects on Electrochemical Performance of Lithium-Ion Batteries: Cognizance of the Battery Failure Sources.” J. Power Sources, 312 70–79 (2016)

    Article  ADS  CAS  Google Scholar 

  4. Ruschak, KJ, “Limiting Flow in a Pre-metered Coating Device.” Chem. Eng. Sci., 31 (11) 1057–1060 (1976)

    Article  CAS  Google Scholar 

  5. Landau, L, Levich, B, “Dragging of a Liquid by a Moving Plate.” Acta Physicochim. URSS, 17 42–54 (1942)

    Google Scholar 

  6. Higgins, BG, Scriven, LE, “Capillary Pressure and Viscous Pressure Drop Set Bounds on Coating Bead Operability.” Chem. Eng. Sci., 35 (3) 673–682 (1980)

    Article  CAS  Google Scholar 

  7. Koh, HJ, Kwon, I, Jung, HW, et al. “Operability Window of Slot Coating Using Viscocapillary Model for Carreau-Type Coating Liquids.” Korea Aust. Rheol. J., 24 (2) 137–141 (2012)

    Article  Google Scholar 

  8. Lee, SH, Koh, HJ, Ryu, BK, et al. “Operability Coating Windows and Frequency Response in Slot Coating Flows from a Viscocapillary Model.” Chem. Eng. Sci., 66 (21) 4953–4959 (2011)

    Article  CAS  Google Scholar 

  9. Tsuda, T, “Coating Flows of Power-Law Non-Newtonian Fluids in Slot Coating.” Nihon Reoroji Gakkaishi, 38 (45) 223–230 (2011)

    Google Scholar 

  10. Jang, I, Song, S, “A Model for Prediction of Minimum Coating Thickness in High Speed Slot Coating.” Int. J. Heat Fluid Flow, 40 180–185 (2013)

    Article  Google Scholar 

  11. Yoon, J, Kim, D, Lee, SH, et al. “Simplified Model for Operability Window of Slot Coating Without Vacuum.” Chem. Eng. Sci., 259 117766 (2022)

    Article  CAS  Google Scholar 

  12. Carvalho, MS, Kheshgi, HS, “Low-Flow Limit in Slot Coating: Theory and Experiments.” AICHE J., 46 (10) 1907–1917 (2000)

    Article  ADS  CAS  Google Scholar 

  13. Chang, YR, Chang, HM, Lin, CF, et al. “Three Minimum Wet Thickness Regions of Slot Die Coating.” J. Colloid Interface Sci., 308 (1) 222–230 (2007)

    Article  ADS  CAS  PubMed  Google Scholar 

  14. Kwak, H, Nam, J, “Effect of Slot-Die Configurations on Coating Gap Dependence of Maximum and Minimum Wet Thicknesses.” AICHE J., 68 e17745 (2022)

    Article  ADS  CAS  Google Scholar 

  15. Malakhov, R, Tjiptowidjojo, K, Schunk, PR, “Mechanics of the Low-Flow Limit in Slot-Die Coating with No Vacuum.” AICHE J., 65 (6) e16593 (2019)

    Article  ADS  Google Scholar 

  16. Lee, SH, Kim, SJ, Nam, J, et al. “Effect of Sloped Die Lip Geometry on the Operability Window in Slot Coating Flows Using Viscocapillary and Two-dimensional Models.” J. Coat. Technol. Res., 11 (1) 47–55 (2014)

    Article  CAS  Google Scholar 

  17. Ahn, WG, Lee, SH, Nam, J, et al. “Effect of Upstream Meniscus Shape on Dynamic Wetting and Operating Limits of Newtonian Coating Liquids in Slot Coating Bead Flows.” J. Coat. Technol. Res., 15 (5) 1067–1076 (2018)

    Article  CAS  Google Scholar 

  18. Tan, P, Diao, S, Huang, T, et al. “Mechanism and Control of the Trailing Edge in Intermittent Slot Die Coating.” Ind. Eng. Chem. Res., 59 (35) 15758–15767 (2020)

    Article  CAS  Google Scholar 

  19. Bhamidipati, KL, “Detection and Elimination of Defects During Manufacture of High-temperature Polymer Electrolyte Membranes.” Dissertation, Georgia Institute of Technology (2011)

  20. Bhamidipati, KL, Harris, TAL, “Numerical Simulation of a High Temperature Polymer Electrolyte Membrane Fabrication Process.” J. Fuel Cell Sci. Technol., 7 (6) 061005 (2010)

    Article  Google Scholar 

  21. Huang, T, Tan, P, Zhong, Z, et al. “Numerical and Experimental Investigation on the Defect Formation in Lithium-Ion-Battery Electrode-Slot Coating.” Chem. Eng. Sci., 258 117744 (2022)

    Article  CAS  Google Scholar 

  22. Kim, S, Lee, J, Lee, C, “Computational Fluid Dynamics Model for Thickness and Uniformity Prediction of Coating Layer in Slot-Die Process.” Int. J. Adv. Manuf. Technol., 104 (5) 2991–2997 (2019)

    Article  MathSciNet  Google Scholar 

  23. Jung, H, Nam, J, “Numerical Analysis of Pulsatile Flows in a Slot-Die Manifold.” J. Coat. Technol. Res., 16 (4) 1141–1151 (2019)

    Article  CAS  Google Scholar 

  24. Schmitt, M, Baunach, M, Wengeler, L, et al. “Slot-die Processing of Lithium-Ion Battery Electrodes-Coating Window Characterization.” Chem. Eng. Process., 68 32–37 (2013)

    Article  CAS  Google Scholar 

  25. Kwade, A, Haselrieder, W, Leithoff, R, et al. “Current Status and Challenges for Automotive Battery Production Technologies.” Nat. Energy, 3 (4) 290–300 (2018)

    Article  ADS  Google Scholar 

  26. Pan, W, Chen, Z, Chen, X, et al. “Slot Die Coating Window for a Uniform Fuel Cell Ink Dispersion.” AICHE J., 68 e17719 (2022)

    Article  CAS  Google Scholar 

  27. Siqueira, IR, Carvalho, MS, “A Computational Study of the Effect of Particle Migration on the Low-Flow Limit in Slot Coating of Particle Suspensions.” J. Coat. Technol. Res., 16 (6) 1619–1628 (2019)

    Article  CAS  Google Scholar 

  28. de Araujo, SB, Carvalho, MS, “Sedimentation and Marangoni Stress in Slot Coating Flow of Particle Suspension.” J. Non Newton. Fluid Mech., 247 53–61 (2017)

    Article  MathSciNet  Google Scholar 

  29. Rebouças, RB, Siqueira, IR, Carvalho, MS, “Slot Coating Flow of Particle Suspensions: Particle Migration in Shear Sensitive Liquids.” J. Nonnewton. Fluid Mech., 258 22–31 (2018)

    Article  MathSciNet  Google Scholar 

  30. Hirt, CW, Nichols, BD, “Volume of Fluid (VOF) Method for the Dynamics of Free Boundaries.” J. Comput. Phys., 39 (1) 201–225 (1981)

    Article  ADS  Google Scholar 

  31. Schmitt, M, Scharfe, P, Schabel, W, “Slot Die Coating of Lithium-Ion Battery Electrodes: Investigations on Edge Effect Issues for Stripe and Pattern Coatings.” J. Coat. Technol. Res., 11 (1) 57–63 (2014)

    Article  CAS  Google Scholar 

  32. Blake, TD, Dobson, RA, Ruschak, KJ, “Wetting at High Capillary Numbers.” J. Colloid Interface Sci., 279 (1) 198–205 (2004)

    Article  ADS  CAS  PubMed  Google Scholar 

  33. Spiegel, S, Heckmann, T, Altvater, A, et al. “Investigation of Edge Formation During the Coating Process of Li-Ion Battery Electrodes.” J. Coat. Technol. Res., 19 (1) 121–130 (2022)

    Article  CAS  Google Scholar 

  34. Higgins, BG, The Physics of the Viscocapillary Coating Bead. Convertech (2001)

    Google Scholar 

  35. Kwak, H, Nam, J, “Simple Criterion for Vortex Formation in the Channel Flow of Power-Law Fluids.” J. Nonnewton. Fluid Mech., 284 104372 (2020)

    Article  MathSciNet  CAS  Google Scholar 

Download references

Acknowledgments

The work was supported by grants from the Research Project Supported by Shanxi Scholarship Council of China (Grant No: 2021-137) and Fundamental Research Program of Shanxi Province (Grant No: 202103021224273).

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Authors and Affiliations

  1. School of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan, 030024, China

    Xiaosong Gong, Jie Han & Xiaozhong Du

  2. College of Automobile Engineering, Wuhan University of Technology, Wuhan, 430070, China

    Fei Yan

  3. School of Energy and Materials Engineering, Taiyuan University of Science and Technology, Taiyuan, 030024, China

    Xiaozhong Du

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  1. Xiaosong Gong
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Correspondence to Xiaozhong Du.

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Gong, X., Han, J., Yan, F. et al. Numerical and experimental investigation on formation of the film for different die lip configurations in lithium-ion battery electrode slot-die coating. J Coat Technol Res 21, 481–492 (2024). https://doi.org/10.1007/s11998-023-00874-4

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  • DOI: https://doi.org/10.1007/s11998-023-00874-4

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