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| Effects of Fiber Scale on Pore Structure and Liquid Absorption Properties of Capacitor Separator |
| Received:January 08, 2026 Revised:February 17, 2026 |
| DOI：10.11980/j.issn.0254-508X.2026.07.008 |
| Key Words:fibrillated para-aramid pulp fiber scale capacitor separator pore structure liquid absorption properties |
| Author Name | Affiliation | Postcode | | Tang Na* | 1National Engineering Research Center of Papermaking and Pollution Control, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | Shen Dong | 2HMEI Machinery & Engineering Co.,Ltd., Hangzhou, Zhejiang Province, 021100 | 021100 | | Zhang Xuejiao | 1National Engineering Research Center of Papermaking and Pollution Control, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | Zhang Aojie | 1National Engineering Research Center of Papermaking and Pollution Control, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | Liu Shuyang | 1National Engineering Research Center of Papermaking and Pollution Control, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | Long Jin* | 1National Engineering Research Center of Papermaking and Pollution Control, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 |
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| Abstract:To optimize the structure of capacitor separators and improve their compatibility with electrolytes, this study used para-aramid (PPTA) pulp as raw material, and employed multistage sieving to achieve hierarchical regulation of fiber scale. PPTA separators and PPTA/PET composite separators doped with polyethylene terephthalate (PET) fibers were prepared by wet forming. The influence of PPTA fiber scale on the pore structure and liquid absorption performance of the separators was investigated, and the application performance of the capacitor separators such as wettability, thermal dimensional stability, and impedance performance was analyzed. The results showed that multistage sieving could effectively remove the coarse fibers in PPTA pulp, and the pore structure and liquid absorption performance of the separators could be optimized by reducing the fiber scale. Under the condition that the mass ratio of PPTA pulp to PET fiber was 9∶1, the overall structural change law of PPTA/PET composite separators with different PPTA fiber scales still remained similar to that of pure PPTA separators. The liquid absorption kinetic behavior of separators with different PPTA fiber scales conformed to the modified Lucas-Washburn equation, and the separators prepared with PPTA pulp sieved of 50~100, 100~200, and 200~300 mesh had relatively small differences in pore structure and liquid absorption performance. Compared with the commercial separator HKMSX-5018, the self-made PPTA/PET composite separator (sieved of 50~300 mesh) had a smaller average pore size (0.74 μm), better liquid absorption performance (liquid absorption ratio of 975% and liquid absorption height of 31.1 mm/10 min), and showed good thermal dimensional stability and impedance performance. |
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