A process model for slot coating of narrow stripes

Parsekian, Ara W.; Jeong, Tae-Joong; Harris, Tequila A. L.

doi:10.1007/s11998-019-00233-2

Cited by 6 publications

(11 citation statements)

References 27 publications

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“…1 Meanwhile, intermittent slot die coating inherits the advantage of slot die coating that the coating thickness, h, can be preset and precisely controlled according to h = Q/V sub , where Q is the flow rate and V sub is the coating speed. 7,8 However, the trailing edge is a great challenge for the development of intermittent slot die coating. 1 The trailing edge is an edge of uneven coating thickness that existed between the coated and non-coated regions, which forms when the slurry feeding changes from open to closed.…”

Section: Introductionmentioning

confidence: 99%

“…Intermittent slot die coating can gain the structured coating layer by composing the coated and non-coated regions on the basis of ensuring process continuity . Meanwhile, intermittent slot die coating inherits the advantage of slot die coating that the coating thickness, h , can be preset and precisely controlled according to h = Q / V sub , where Q is the flow rate and V sub is the coating speed. , …”

Section: Introductionmentioning

confidence: 99%

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Mechanism and Control of the Trailing Edge in Intermittent Slot Die Coating

Tan

Diao

Huang

et al. 2020

Ind. Eng. Chem. Res.

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Intermittent slot die coating is widely used to create the structured coating layer in the flexible electronics production but is inevitable to engender trailing edge of uneven coating thickness. Herein, we established a validated two-dimensional model to analyze the mechanism of the trailing edge and discussed the method to control its length. We found that the tail length was greatly depending on the capillary number (Ca), and it could be divided into three regions as Ca increased. The tail length reduced gradually in the tail length reduction region, was stable, and could be well controlled in the stable region while increased rapidly and irregularly in the unstable region. Meanwhile, a higher viscous and smaller static contact angle could control the tail length by postponing the tail length unstable region. Furthermore, a criterion within ±18% accuracy was proposed for a quick prediction of the tail length stable region in the industrial production.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanism and Control of the Trailing Edge in Intermittent Slot Die Coating

Tan

Diao

Huang

et al. 2020

Ind. Eng. Chem. Res.

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“…73,79 Furthermore, because pattern generation is mediated by meniscus behavior and post-deposition spreading, process capability is strongly tied to the physical properties of the coating material, substrate, and slot die tool. 59,64,79,80 Resolution performance of the process is limited by the smallest achievable meniscus between the coating tool and substrate, 80 and strategies to control post-deposition spreading require significant process characterization in the absence of substrate wettability enhancements. 37,38,80 In this work, a single-step slot die coating technique for heterogeneous narrow-stripe patterns is introduced and demonstrated with feature sizes below 1 mm.…”

Section: Introductionmentioning

confidence: 99%

“…59,64,79,80 Resolution performance of the process is limited by the smallest achievable meniscus between the coating tool and substrate, 80 and strategies to control post-deposition spreading require significant process characterization in the absence of substrate wettability enhancements. 37,38,80 In this work, a single-step slot die coating technique for heterogeneous narrow-stripe patterns is introduced and demonstrated with feature sizes below 1 mm. The technique is unique 81 in its ability to process materials that suffer from dewetting defects with conventional solution processing methods, by virtue of a support fluid codeposited with the stripe pattern.…”

Section: Introductionmentioning

confidence: 99%

Scalable, Alternating Narrow Stripes of Polyvinyl Alcohol Support and Unmodified PEDOT:PSS with Maintained Conductivity Using a Single-Step Slot Die Coating Approach

Parsekian

Harris

2019

ACS Appl. Mater. Interfaces

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Slot die coating has been established as an economical approach for deposition of parallel narrow stripes, a constituent pattern feature in many printed device applications. However, the minimum feature size that can be achieved using this approach is constrained by wetting and liquid bridge phenomena at the deposition region. We hypothesize that pattern resolution and process control can be improved by co-depositing a support fluid to stabilize the pattern. Electrically conductive poly(3,4ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) is slot die-coated in parallel stripes on flexible poly(ethylene terephthalate) substrate, without wettability-enhancing dopants or substrate pretreatment. A miscible liquid phase, polyvinyl alcohol, is used as the support material. Feature size performance and conductivity of PEDOT:PSS stripe regions are evaluated across a range of process conditions. Narrow PEDOT:PSS stripes produced using our technique range from 400 to 850 μm and exhibit conductivity approaching 1.5 S cm −1 . This electrical performance falls within the upper range expected prior to standard conductivity-enhancing post-treatments. Significantly, dewetting effects normally present with undoped PEDOT:PSS on the plastic substrate are fully mitigated with our deposition technique. These results indicate high ease of processing and good feature size performance, with few inherent drawbacks to the functional properties of the patterned films.

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“…Ultimately, strategies to mitigate deleterious interphase formation need to be extended to roll-to-roll (R2R) scales. − Li metal forms a passivating surface film (even in dry environments), and this film can lead to a high interfacial resistance that can result in cell degradation. High interfacial resistance must be minimized during manufacturing, if large Li-metal foils are used in place of traditional anodes.…”

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confidence: 99%

Challenges in Lithium Metal Anodes for Solid-State Batteries

et al. 2020

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In this Perspective, we highlight recent progress and challenges related to the integration of lithium metal anodes in solid-state batteries. While prior reports have suggested that solid electrolytes may be impermeable to lithium metal, this hypothesis has been disproven under a variety of electrolyte compositions and cycling conditions. Herein, we describe the mechanistic origins and importance of lithium filament growth and interphase formation in inorganic and organic solid electrolytes. Multimodal techniques that combine real and reciprocal space imaging and modeling will be necessary to fully understand nonequilibrium dynamics at these buried interfaces. Currently, most studies on lithium electrode kinetics at solid electrolyte interfaces are completed in symmetric Li–Li configurations. To fully understand the challenges and opportunities afforded by Li-metal anodes, full-cell experiments are necessary. Finally, the impacts of operating conditions on solid-state batteries are largely unknown with respect to pressure, geometry, and break-in protocols. Given the rapid growth of this community and the diverse portfolio of solid electrolytes, we highlight the need for detailed reporting of experimental conditions and standardization of protocols across the community.

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A process model for slot coating of narrow stripes

Cited by 6 publications

References 27 publications

Mechanism and Control of the Trailing Edge in Intermittent Slot Die Coating

Mechanism and Control of the Trailing Edge in Intermittent Slot Die Coating

Scalable, Alternating Narrow Stripes of Polyvinyl Alcohol Support and Unmodified PEDOT:PSS with Maintained Conductivity Using a Single-Step Slot Die Coating Approach

Challenges in Lithium Metal Anodes for Solid-State Batteries

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