What are some properties of Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)?
PVDF-HFP has properties such as good thermal stability, high polarity, ionic conductivity, and good solvent resistance.
How is PVDF-HFP used in energy storage applications?
PVDF-HFP is used as a polymer matrix to prepare gel polymer electrolytes for energy storage applications, specifically in enhancing the performance of flexible solid-state supercapacitors.
What are some other applications of PVDF-HFP?
PVDF-HFP can also be used to prepare superhydrophobic polymer nanocomposites, enhance thermochromism in regioregular poly(3-hexylthiophene), and prepare lead-free piezoelectric flexible polymer composites for nanogenerators.
What are some features and benefits of PVDF-HFP?
PVDF-HFP exhibits excellent thermal stability, chemical and abrasion resistance, imperviousness to UV degradation, self-extinguishing properties, and retains properties on aging. It also has improved flexibility at subzero temperatures, stress crack resistance, and elongation to break over poly(vinylidene fluoride).
What is the physical form of PVDF-HFP?
PVDF-HFP is a crystalline, thermoplastic copolymer.
What are solid polymer electrolytes (SPEs) and why are they practical?
Solid polymer electrolytes (SPEs) are flexible, low cost, and easily scalable for battery manufacturing. These properties make SPEs one of the most practical solid-state electrolytes.
Why is PVDF-HFP considered a promising polymer for SPEs?
PVDF-HFP is considered a promising polymer for SPEs due to its good mechanical properties and good thermal stability.
What issue arises when PVDF-HFP-based electrolytes cycle with Li metal?
PVDF-HFP is unstable due to the dehydrofluorination side reaction that occurs when PVDF-HFP-based electrolytes cycle with Li metal. This reaction leads to the deterioration of the electrolyte-electrode interface.
How can the stability of PVDF-HFP polymer electrolyte be enhanced?
The stability of PVDF-HFP polymer electrolyte can be enhanced by modifying it with LiOH during the synthesis of SPEs (pre-dehydrofluorination). This modification leads to significantly enhanced stability toward the Li metal anode."
