蒙脱石纳米片/聚偏氟乙烯改性聚丙烯复合隔膜的制备及性能研究

孔静; 李宇恒; 胡雅祺; 王蕊; 陈天星

doi:10.13779/j.cnki.issn1001-0076.2023.06.013

蒙脱石纳米片/聚偏氟乙烯改性聚丙烯复合隔膜的制备及性能研究

西安建筑科技大学资源工程学院，陕西西安 710055

基金项目: 国家自然科学基金青年基金项目(52104267)

详细信息

作者简介: 孔静（1998—），女，陕西渭南人，硕士研究生，主要从事矿物材料及其资源综合利用研究，E-mail：18209285398@163.com

通讯作者: 陈天星(1992—)，男，山西运城人，博士，副教授，主要从事新能源矿物材料、盐湖资源综合高效利用研究，E-mail：chentian2728@xauat.edu.cn。

中图分类号: TD985；TQ320.72

收稿日期: 2023-06-13

刊出日期: 2023-12-25

Preparation and Performance of Montmorillonite Nanosheet/PVDF−Polypropylene Composite Separator

School of Resources Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, Shaanxi, China

More Information

Corresponding author: CHEN Tianxing, chentian2728@xauat.edu.cn

Received Date: 13 June 2023

Publish Date: 25 December 2023

摘要

摘要:
商用聚烯烃隔膜表现出较差的电解液浸润性和大幅的热收缩性，不利于锂离子电池的安全高效运行。利用天然矿物独特的晶体结构、良好的润湿性、优异的热稳定性和机械稳定性，在聚烯烃隔膜表面涂覆天然矿物材料是增强隔膜性能的方法之一。采用刮涂法制备了复合隔膜（MMT−PVDF/PP），对复合隔膜的机械性能、润湿性能、热稳定性等性能进行了研究。结果表明：当涂布液中蒙脱石纳米片和黏结剂的质量比为5∶5时，复合隔膜表面形成了MMT−PVDF三维稳定结构，相比聚丙烯隔膜（PP），MMT−PVDF/PP复合隔膜的拉伸强度提升了6倍，吸液率和保液率分别提升了24.93百分点和96.7百分点。复合隔膜在150℃环境下1 h后仍能维持较好的尺寸形态，收缩率不到10%。
- 锂离子电池 /
- 聚烯烃隔膜 /
- 电解液润湿性 /
- 热收缩性
Abstract:
Commercial polyolefin separators exhibit poor electrolyte wettability and severe thermal shrinkage, which are not conducive to the safe and efficient operation of lithium−ion batteries. Using the unique crystal structure, good wettability, excellent thermal and mechanical stability of natural minerals, coating raw mineral materials on the surface of polyolefin separators is one of the methods to enhance the performance of the separators. The composite separator (MMT−PVDF/PP) was prepared by scraping coating method, and the mechanical properties, wettability, thermal stability of the composite separator were investigated. The results showed that when the mass ratio of montmorillonite nanosheets and binder in the coating solution was 5∶5, a three−dimensional stabilized structure of MMT−PVDF was formed on the surface of the composite separator. Compared with polypropylene separators (PP), the tensile strength of the MMT−PVDF/PP composite separator was increased by 6 times, and the electrolyte uptake and retention rate were increased by 24.93% and 96.7%, respectively. The composite separator can maintain a good dimensional morphology at 150 ℃ for 1h with less than 10% shrinkage.
- lithium−ion battery /
- polyolefin separator /
- electrolyte wettability /
- thermal shrinkage

HTML全文

图 1 MMT−PVDF/PP隔膜制备过程

Figure 1.

下载: 全尺寸图片幻灯片

图 2 不同比例MMT−PVDF混合涂覆PP隔膜的扫描电镜照片

Figure 2.

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图 3 不同比例MMT−PVDF涂覆改性隔膜的拉伸应力曲线

Figure 3.

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图 4 不同比例MMT−PVDF涂覆改性隔膜的水接触角照片

Figure 4.

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图 5 不同比例MMT−PVDF涂覆改性隔膜的吸液率和保液率

Figure 5.

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图 6 不同比例MMT−PVDF涂覆改性隔膜的热收缩（a）与热收缩率（b）

Figure 6.

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表 1 不同比例MMT−PVDF涂覆改性隔膜的其他性能

Table 1. Other propertis of modified separator coated with different ratios of MMT−PVDF

项目	m(MMT)∶m(PVDF)=3∶7	m(MMT)∶m(PVDF)=5∶5	m(MMT)∶m(PVDF)=7∶3
厚度/μm	39	32	35
面密度/(g·m⁻²)	14.03	15.34	10.37
孔隙率/%	93.39	95.39	93.83
拉伸强度(MD)/MPa	48.6	58.12	88.11
断裂伸长率(TD)/%	67.34	83.28	30.39
最大力/N	97.2	101.72	88.11

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