Citation: Ding Lei, Guan Xu, Qian Ge, Tong Wu, Feng Yang, Xiang Ming. Effect of Fumed SiO₂ on Pore Formation Mechanism and Various Performances of β-iPP Microporous Membrane Used for Lithium-ion Battery Separator[J]. Chinese Journal of Polymer Science, ;2018, 36(4): 536-545. doi: 10.1007/s10118-018-2029-7 shu

Effect of Fumed SiO₂ on Pore Formation Mechanism and Various Performances of β-iPP Microporous Membrane Used for Lithium-ion Battery Separator

State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China

Corresponding author: Feng Yang, yangfengscu@126.com
Received Date: 17 June 2017
Accepted Date: 30 August 2017
Available Online: 7 November 2017

In this work, four samples containing different contents of fumed SiO₂ were prepared to improve the pore size distribution and various properties of β nucleated isotatic polypropylene (β-iPP) biaxial membrane used for lithium-ion battery separator. The wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC) results show that the fumed SiO₂ promotes the formation of β-crystal slightly and narrows down the thickness distribution of β-lamellae; meanwhile, evenly distributed SiO₂ within β-iPP can be inspected by scanning electron microscopy (SEM). Moreover, further detailed characterization of morphological evolutions during biaxial stretching by tensile testing and SEM manifests that SiO₂ can strengthen β-iPP and make the samples deform more homogeneously, resulting in a gradually elaborate and finer oriented microfibril structure after longitudinal stretching, in which more uniform defects distribute between fibrils and restrain the formation of coarse fibrils effectively. Therefore, more superior microporous structure emerges with the addition of SiO₂, accompanied by narrower pore size distribution and better connectivity between microvoids, which is confirmed by mercury porosimeter and diminished Gurley value. Moreover, the lower thermal shrinkage, decreased shrinkage rate and suppressed porosity reduction indicate that fumed SiO₂ improves thermal and dimensional stability of membrane dramatically. Furthermore, due to the excellent wettability of SiO₂ with electrolyte, the microporous membranes doped with SiO₂ have higher electrolyte uptake, even after heat treatment at elevated temperature.
- β Nucleated polypropylene,
- Fumed SiO₂,
- Microporous membrane,
- Pore size distribution,
- Thermal stability and wettability
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Effect of Fumed SiO2 on Pore Formation Mechanism and Various Performances of β-iPP Microporous Membrane Used for Lithium-ion Battery Separator

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Effect of Fumed SiO₂ on Pore Formation Mechanism and Various Performances of β-iPP Microporous Membrane Used for Lithium-ion Battery Separator