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| Study on the Effect of Temperature Treatment on the Properties of Cellulose-based Separators |
| Received:June 23, 2025 Revised:July 16, 2025 |
| DOI：10.11980/j.issn.0254-508X.2025.10.008 |
| Key Words:cellulose-based separator liquid absorption rate air permeability tensile strength breakdown voltage |
| Fund Project:浙江省博士后科研项目择优资助项目（ZJ2023167）；浙江科技大学环境与资源学院青年教师创新研究项目（HZQY20241）；浙江省丽水市遂昌县重点研发计划项目（SCX2023ZDYF02）。 |
| Author Name | Affiliation | Postcode | | ZHANG Liang* | School of Environmental and Nature Resources, Zhejiang University of Science and Technology, Hangzhou, Zhejiang Province, 310023 | 310023 | | LIU Chengyue | Zhejiang KAN New Materials Co., Ltd., Lishui, Zhejiang Province, 323300 | 323300 | | LI Nanhua | Zhejiang KAN New Materials Co., Ltd., Lishui, Zhejiang Province, 323300 | 323300 | | LI Lizi* | Zhejiang KAN New Materials Co., Ltd., Lishui, Zhejiang Province, 323300 | 323300 | | KONG Yuling | Zhejiang KAN New Materials Co., Ltd., Lishui, Zhejiang Province, 323300 | 323300 | | WU Caiyan | Zhejiang KAN New Materials Co., Ltd., Lishui, Zhejiang Province, 323300 | 323300 | | SU Cuiyang | School of Environmental and Nature Resources, Zhejiang University of Science and Technology, Hangzhou, Zhejiang Province, 310023 | 310023 | | HU Zhijun | School of Environmental and Nature Resources, Zhejiang University of Science and Technology, Hangzhou, Zhejiang Province, 310023 | 310023 | | CHEN Hua* | School of Environmental and Nature Resources, Zhejiang University of Science and Technology, Hangzhou, Zhejiang Province, 310023 | 310023 | | YOU Yanzhi* | School of Environmental and Nature Resources, Zhejiang University of Science and Technology, Hangzhou, Zhejiang Province, 310023
Zhejiang KAN New Materials Co., Ltd., Lishui, Zhejiang Province, 323300
College of Materials Science and Engineering, Northeast Forestry University, Harbin, Heilongjiang Province, 150040 | 150040 |
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| Abstract:In this study， the influence mechanism of temperature treatment on the multi-scale performance of two quantitative cellulose-based separators (E20-L/E40-H) was systematically investigated. The physical properties， mechanical properties， structural evolution， thermal and electrical properties of the separator were comprehensively characterized by medium and high temperature (125 ℃/48 h， 250 ℃/20 min) and low temperature (-40 ℃/48 h， -60 ℃/48 h) treatment. The results showed that extreme low temperature (-60 ℃) increased the liquid absorption rate of E40-H from 104.6% at room temperature to 113.0%， but E20-L decreased from 84.6% at room temperature to 81.3%， and high temperature (250 ℃) significantly reduced the liquid absorption rate of both. 125 ℃ treatment enhanced the mechanical strength through hydrogen bond enhancement (the burst strength of E20-L increased from 81.4 kPa to 86.1 kPa at room temperature， while that of E40-H increased from 96.3 kPa to 105.3 kPa)， and 250 ℃ led to performance degradation due to cellulose degradation. The crystallinity index of E20-L decreased from 71.6% at room temperature to 47.1% at -60 ℃， revealing that the low-quantitative separator was more sensitive to extreme low temperature. Structural analysis confirmed that high temperature destroyed the fiber structure by pyrolysis， which led to fiber collapse， and low temperature induced keratinization. The electrical performance showed an antagonistic law of increasing breakdown voltage at low temperature but increasing ESR and overall deterioration at high temperature. |
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