文献类型：期刊文献

英文题名：Slot die coating window for a uniform fuel cell ink dispersion

作者：Pan, Weitong[1];Chen, Zhekun[1];Chen, Xueli[1];Wang, Fuchen[1];Dai, Gance[2]

机构：[1]East China Univ Sci & Technol, Inst Clean Coal Technol, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2022

卷号：68

期号：8

外文期刊名：AICHE JOURNAL

收录：;EI(收录号：20221912071480);WOS:【SCI-EXPANDED(收录号:WOS:000791462600001)】；

语种：英文

外文关键词：coating gap; particulate coating window; phase-field method; shear-induced migration; shear-thinning

摘要：The continuous roll-to-roll slot die coating technique has shown great potential for fuel cell electrode fabrication. It is essential to determine the particulate coating window to obtain a defect-free film of uniform thickness and uniform particle dispersion. For this dual-purpose, an additional upper operating limit has been proposed via a "flow field analysis scheme" that combines analysis and simulation. In this analysis, the fundamentals of flow pattern transition (Poiseuille-Couette-bubbly flow) behind coating limits are clarified. The Couette flow is advantageous for uniform shear rate and dispersion. Furthermore, phase-field simulations systematically investigate the effect of fluid and geometrical parameters and quantitatively present the flow limit with explicit expression. Results reveal that the slope of the upper limit is inversely correlated with shear-thinning index n while proportional to the coating gap H. Combining the bubble entrainment boundary, lower n and H are favorable for a larger particulate coating window.