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

KONG Jing; LI Yuheng; HU Yaqi; WANG Rui; CHEN Tianxing

doi:10.13779/j.cnki.issn1001-0076.2023.06.013

2023 Vol. 43, No. 6

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Article navigation > Conservation and Utilization of Mineral Resources > 2023 > 43(6): 107-113

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KONG Jing, LI Yuheng, HU Yaqi, WANG Rui, CHEN Tianxing. Preparation and Performance of Montmorillonite Nanosheet/PVDF−Polypropylene Composite Separator[J]. Conservation and Utilization of Mineral Resources, 2023, 43(6): 107-113. doi: 10.13779/j.cnki.issn1001-0076.2023.06.013

Citation:

KONG Jing, LI Yuheng, HU Yaqi, WANG Rui, CHEN Tianxing. Preparation and Performance of Montmorillonite Nanosheet/PVDF−Polypropylene Composite Separator[J]. Conservation and Utilization of Mineral Resources, 2023, 43(6): 107-113. doi: 10.13779/j.cnki.issn1001-0076.2023.06.013

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

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

Received Date: 13 June 2023

Publish Date: 25 December 2023

Abstract

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

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References

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