Influence of Heat-setting Temperature on the Microporous Structure and Properties of PP/HDPE Bilayer Microporous Membranes

IF 4.1 2区 化学 Q2 POLYMER SCIENCE Chinese Journal of Polymer Science Pub Date : 2024-06-26 DOI:10.1007/s10118-024-3157-x
Jie Xie, Yong-Shi Wu, Jia-Yi Xie, Rui-Jie Xu, Cai-Hong Lei, Sai-Nan Song, Guang-Quan Li, An-Ping Huang
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Abstract

Due to the mechanical stability of PP layer, the PP/HDPE double-layer microporous membrane could be prepared at a higher heat-setting temperature than that of PE monolayer membrane. In this work, the effects of heat-setting temperature on the pore structure and properties of PP/HDPE double-layer membrane were studied. With the increase of heat-setting temperature from 120 °C to 130 °C, the length of connecting bridge crystal and crystallinity in the PE layer increase due to the melting of thin lamellae and the stability of connecting bridge structure during heat-setting. The corresponding air permeability, porosity, wettability of liquid electrolyte and mechanical property of the heat-set microporous membrane increase, exhibiting better electrochemical performance. However, when the heat-setting temperature is further increased to 140 °C, higher than the melting point of PE resin, some pores are closed since the lamellae and connecting bridges melt and shrink during heat-setting, resulting in a decrease of air permeability and porosity. In contrast, there is negligible change in the PP layer within the above heat-setting temperature region. This study successfully builds the relationship between the stable pore structure and property of microporous membrane during heat-setting, which is helpful to guide the production of high-performance PP/PE/PP lithium batteries separator.

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热固温度对 PP/HDPE 双层微孔膜的微孔结构和性能的影响
由于 PP 层的机械稳定性,PP/HDPE 双层微孔膜可以在比 PE 单层膜更高的热固温度下制备。本文研究了热固温度对 PP/HDPE 双层膜孔结构和性能的影响。随着热固温度从 120 °C 升至 130 °C,PE 层中的连接桥晶体长度和结晶度增加,这是由于薄层片熔化以及热固过程中连接桥结构的稳定性所致。相应地,热固微孔膜的透气性、孔隙率、液体电解质的润湿性和机械性能都会增加,从而表现出更好的电化学性能。然而,当热固温度进一步升高到 140 ℃(高于聚乙烯树脂的熔点)时,由于片层和连接桥在热固过程中熔化和收缩,部分孔隙被封闭,导致透气性和孔隙率下降。相反,在上述热固温度区域内,聚丙烯层的变化可以忽略不计。该研究成功地建立了微孔膜在热固过程中稳定的孔结构与性能之间的关系,有助于指导高性能 PP/PE/PP 锂电池隔膜的生产。
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来源期刊
Chinese Journal of Polymer Science
Chinese Journal of Polymer Science 化学-高分子科学
CiteScore
7.10
自引率
11.60%
发文量
218
审稿时长
6.0 months
期刊介绍: Chinese Journal of Polymer Science (CJPS) is a monthly journal published in English and sponsored by the Chinese Chemical Society and the Institute of Chemistry, Chinese Academy of Sciences. CJPS is edited by a distinguished Editorial Board headed by Professor Qi-Feng Zhou and supported by an International Advisory Board in which many famous active polymer scientists all over the world are included. The journal was first published in 1983 under the title Polymer Communications and has the current name since 1985. CJPS is a peer-reviewed journal dedicated to the timely publication of original research ideas and results in the field of polymer science. The issues may carry regular papers, rapid communications and notes as well as feature articles. As a leading polymer journal in China published in English, CJPS reflects the new achievements obtained in various laboratories of China, CJPS also includes papers submitted by scientists of different countries and regions outside of China, reflecting the international nature of the journal.
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