Effect of Fumed SiO<sub>2</sub> on Pore Formation Mechanism and Various Performances of <italic style="font-style: italic">β</italic>-<italic style="font-style: italic">i</italic>PP Microporous Membrane Used for Lithium-ion Battery Separator

Ding Lei; Guan Xu; Qian Ge; Tong Wu; Feng Yang; Xiang Ming

doi:10.1007/s10118-018-2029-7

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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

Articles | Updated：2021-02-18

- Effect of Fumed SiO₂ on Pore Formation Mechanism and Various Performances of β-iPP Microporous Membrane Used for Lithium-ion Battery Separator
- Chinese Journal of Polymer Science Vol. 36, Issue 4, Pages: 536-545(2018)
- Affiliations：
  
  State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
- Author bio：
  
  E-mail yangfengscu@126.com
- Funds：
- DOI：10.1007/s10118-018-2029-7
  CLC：
- Received：17 June 2017，
  
  Accepted：30 August 2017，
  
  Online First：07 November 2017，
  
  Published：05 April 2018
- Accepted：
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Ding Lei, Guan Xu, Qian Ge, et al. 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.
DOI：

Ding Lei, Guan Xu, Qian Ge, et al. 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. DOI：

摘要

Abstract

In this work

four samples containing different contents of fumed SiO

were prepared to improve the pore size distribution and various properties of

nucleated isotatic polypropylene (

PP) 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 SiO

promotes the formation of

-crystal slightly and narrows down the thickness distribution of

-lamellae; meanwhile

evenly distributed SiO

within

PP 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 SiO

can strengthen

PP 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 SiO

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 SiO

improves thermal and dimensional stability of membrane dramatically. Furthermore

due to the excellent wettability of SiO

with electrolyte

the microporous membranes doped with SiO

have higher electrolyte uptake

even after heat treatment at elevated temperature.

关键词

Keywords

references

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⁰

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

DOI：10.1007/s10118-018-2029-7

摘要

Abstract

关键词

Keywords

references

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