Enhanced electroactive phase, dielectric properties and tuning of bandgap in Ho3+ modified PVDF-HFP composite films

Chacko, Sobi K.; Rahul, M.T.; Raneesh, B.; Vinodan, Karthik; Jose, Jini K.; Kalarikkal, Nandakumar

doi:10.1007/s10965-022-03318-6

Cited by 5 publications

(4 citation statements)

References 55 publications

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“…And the new peaks were appeared at 675 and 1664 cm −1 for the PHL film, which may be caused by the cross-linking with interaction between the Li + and polar functional group of PH [ 51 ]. The pronounced Raman peaks at 800 and 837 cm −1 could be attributed to the Raman modes of non-polar α and polar β phases [ 52 ]. Apparently, the intensity of α phase reduced after introducing LiNO 3 .…”

Section: Resultsmentioning

confidence: 99%

Lithium-Ion Charged Polymer Channels Flattening Lithium Metal Anode

Duan,

You,

Wang

et al. 2024

Nano-Micro Lett.

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The concentration difference in the near-surface region of lithium metal is the main cause of lithium dendrite growth. Resolving this issue will be key to achieving high-performance lithium metal batteries (LMBs). Herein, we construct a lithium nitrate (LiNO3)-implanted electroactive β phase polyvinylidene fluoride-co-hexafluoropropylene (PVDF-HFP) crystalline polymorph layer (PHL). The electronegatively charged polymer chains attain lithium ions on the surface to form lithium-ion charged channels. These channels act as reservoirs to sustainably release Li ions to recompense the ionic flux of electrolytes, decreasing the growth of lithium dendrites. The stretched molecular channels can also accelerate the transport of Li ions. The combined effects enable a high Coulombic efficiency of 97.0% for 250 cycles in lithium (Li)||copper (Cu) cell and a stable symmetric plating/stripping behavior over 2000 h at 3 mA cm−2 with ultrahigh Li utilization of 50%. Furthermore, the full cell coupled with PHL-Cu@Li anode and LiFePO4 cathode exhibits long-term cycle stability with high-capacity retention of 95.9% after 900 cycles. Impressively, the full cell paired with LiNi0.87Co0.1Mn0.03O2 maintains a discharge capacity of 170.0 mAh g−1 with a capacity retention of 84.3% after 100 cycles even under harsh condition of ultralow N/P ratio of 0.83. This facile strategy will widen the potential application of LiNO3 in ester-based electrolyte for practical high-voltage LMBs.

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Section: Resultsmentioning

confidence: 99%

Lithium-Ion Charged Polymer Channels Flattening Lithium Metal Anode

Duan,

You,

Wang

et al. 2024

Nano-Micro Lett.

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“…This observation definitively verifies the presence of PA-12 as an additive in the PVDF-HFP matrix. Additionally, peaks corresponding to the α and β phases of PVDF-HFP were evident from 796 to 876 cm –1 , displaying heightened intensity upon including the filler. Similarly, the peak around 1431 cm –1 , associated with the β-phase, demonstrated augmented intensity with the presence of the filler, indicating an increased proportion of the β-phase within the matrix.…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, peaks corresponding to the α and β phases of PVDF-HFP were evident from 796 to 876 cm –1 , displaying heightened intensity upon including the filler. Similarly, the peak around 1431 cm –1 , associated with the β-phase, demonstrated augmented intensity with the presence of the filler, indicating an increased proportion of the β-phase within the matrix. Concerning PA-12, other noticeable peaks were discernible in the composite, attributed to bond stretching, at 936, 1111, and 1294 cm –1 .…”

Section: Resultsmentioning

confidence: 99%

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Distinct Mechanism of Anti-Corrosion and Swelling-Adhesion Modeling of Low-Dimensional Nylon-Fluoropolymer Composite Coatings

Patiño Jaimes,

Caldona,

Kim

et al. 2024

ACS Appl. Polym. Mater.

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Compared to other polymers, composite coatings with fluoropolymers as the matrix have attracted considerable interest due to their mechanical performance, chemical stability, and low surface energy. Herein, we present an anticorrosion mechanism of fluoropolymer composite coatings achieved by dispersing varying amounts of polyamide 12 (PA-12) particles over a poly(vinylidene fluoride-cohexafluoropropylene) (PVDF-HFP) matrix. The choice of PVDF-HFP as a coating matrix was driven by its superior processability and mechanical properties over Teflon, while PA-12 afforded swelling capacity, preventing electrolyte permeation, and inhibiting matrix stress crack propagation. The corrosion resistance of the coatings was assessed mainly by potentiodynamic polarization and impedance measurements while being immersed in a NaCl solution. Our electrochemical measurement findings showed that 0.75% w/w PA-12 in the PVDF-HFP matrix significantly enhanced corrosion protection even after 21 days of immersion. Microscopy, dielectric spectroscopy, surface analysis, and mechanical testing (American Society for Testing and Materials standards) corroborated the results. PVDF-HFP coatings containing a minimum percolation threshold of 0.75 wt % PA-12 with 1 mil thickness on mild steel exhibited a remarkable increase in resistance and film adhesion, and a notable corrosion rate decrease. Finite element analysis simulation with a bilinear traction-separation law confirmed the swelling mechanism and adhesion behavior. This study highlights the potential of nylon particle dispersion in PVDF-HFP matrices as a practical approach to developing advanced anticorrosion coatings with promising practical applications in various industries.

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Dielectric, ferroelectric and magnetoelectric investigations of SrFe12O19-embedded PVDF-HFP nanocomposite fiber mats for flexible electronic applications

Chacko¹,

Raneesh²

2023

J Mater Sci

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Enhanced electroactive phase, dielectric properties and tuning of bandgap in Ho3+ modified PVDF-HFP composite films

Cited by 5 publications

References 55 publications

Lithium-Ion Charged Polymer Channels Flattening Lithium Metal Anode

Lithium-Ion Charged Polymer Channels Flattening Lithium Metal Anode

Distinct Mechanism of Anti-Corrosion and Swelling-Adhesion Modeling of Low-Dimensional Nylon-Fluoropolymer Composite Coatings

Dielectric, ferroelectric and magnetoelectric investigations of SrFe12O19-embedded PVDF-HFP nanocomposite fiber mats for flexible electronic applications

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