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Related Concept Videos

Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...

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Encapsulation and Permeability Characteristics of Plasma Polymerized Hollow Particles
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"Polymer-in-Ceramic" Membrane for Thermally Safe Separator Applications.

Lin Luo1, Zhihao Gao1, Zongmin Zheng1,2

  • 1College of Mechanical and Electrical Engineering, Power & Energy Storage System Research Center, Qingdao University, Qingdao 266071, China.

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|October 17, 2022
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Summary

This study developed advanced polymer-in-ceramic membranes using silicon dioxide (SiO2) and polyvinylidene fluoride (PVDF) for safer lithium-ion batteries. These membranes offer superior thermal stability and performance compared to conventional separators.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Polymer Science

Background:

  • Conventional battery separators face limitations in thermal stability and safety.
  • Developing advanced materials is crucial for enhancing secondary lithium-ion battery performance.
  • Microporous membranes are key components in battery technology.

Purpose of the Study:

  • To prepare and characterize novel "polymer-in-ceramic" composite membranes.
  • To investigate the impact of silicon dioxide (SiO2) content on membrane properties.
  • To evaluate the performance of these membranes as battery separators.

Main Methods:

  • Facile casting method for composite membrane preparation.
  • Systematic study of physical properties: porosity, electrolyte absorption, electrochemical stability, and thermal stability.
  • Fabrication and testing of LiFePO4/PS6/Li half-cells.

Main Results:

  • SiO2/PVDF membranes exhibited higher porosity (66.0%) and electrolyte absorption (239%) than commercial separators.
  • Superior thermal stability with only 2.1% shrinkage at 200 °C for 2 hours.
  • LiFePO4/PS6/Li half-cells showed excellent cycle stability and 99.1% Coulombic efficiency.
  • Enhanced flame retardancy and ion conductivity (1.0 mS·cm-1).

Conclusions:

  • The "polymer-in-ceramic" SiO2/PVDF composite membranes demonstrate significant improvements in thermal and electrochemical properties.
  • These membranes show great promise as safe and efficient separators for secondary lithium-ion batteries.
  • The facile and scalable production method further supports their potential commercialization.