The wettability by electrolyte is a critical characteristic of lithium-ion battery separators since electrolyte absorption is essential for ionic transport. Most importantly, fast absorption of electrolyte facilitates the electrolyte filling and wetting processes during the battery assembly. However, theoretical or experimental investigation of separator wettability has rarely been reported, and thus very little quantitative data can be found in the existing literature. In this study, innovative experimental techniques and associated analytical models have been developed to fully characterize the electrolyte wetting behavior through battery separators. Both in-plane and through-plane imbibition processes are investigated. The results show that, electrolyte needs significantly longer time to wet separators than it does for commercial electrodes. The wetting rate depends significantly on the pore size, porosity, and micro-structure of the separators. Electrolyte in-plane wetting is only observed in the separators manufactured by the wet process. Increasing separator porosity and pore size is shown to be substantially increasing through-plane wetting rate. In addition, ceramic coating is shown to increase in-plane wetting but retard through-plane wetting.

电解质的吸收性是锂离子电池隔膜的一项关键特性，因为电解质的吸收对于离子迁移至关重要。最重要的是，电解质的快速吸收促进了电池组装过程中的电解质填充和润湿过程。但是，很少有关于隔板润湿性的理论或实验研究的报道，因此在现有文献中几乎找不到定量数据。在这项研究中，已开发出创新的实验技术和相关的分析模型，以全面表征通过电池隔板的电解质润湿行为。面内和面内吸收过程均得到了研究。结果表明，与商用电极相比，电解质湿润隔膜所需的时间明显更长。润湿速率明显取决于隔板的孔径，孔隙率和微观结构。仅在通过湿法工艺制造的隔板中观察到电解质的面内润湿。隔板的孔隙率和孔径的增加显示出通面润湿速率的显着提高。另外，陶瓷涂层显示出增加了面内润湿但阻止了贯穿面润湿。