Abstract
In the present article, novel polyvinylidene fluoride (PVDF)/lithium cobalt oxide (LiCoO2) nanocomposite films were prepared using the casting method to use in Li-ion batteries. X-ray diffraction reveals that the deposited LiCoO2 nanoparticles have a hexagonal structure. The AC electrical conductivity σac was measured and investigated using a different range of frequencies and temperatures. The increase in the LiCoO2 content in the PVDF polymeric matrix leads to the formation of the network through the nanocomposites. The dielectric modulus (M′ and M″) and the dielectric parameters (ɛ′ and ɛ″) were studied in detail. The M′ values decrease with the increase in the filler and temperature as the behavior of semiconductor materials. The max values of M″ shifted with a higher frequency after the addition of LiCoO2 and increase of temperature, indicating the temperature dependency of the relaxation time. A single relaxation peak was found, confirming a thermally activated process that passes through a maximum due to the relaxation time. The Cole–Cole (M′ and M″) diagram shows a distinct semicircle, which is attributed to the interfacial phenomena occurring between the components. The nature of the AC electrical conductivity was explained following Juncher’s law. σAC was enhanced due to the movement of charged ions and charge carriers within the nanocomposite samples.
Highlights
The development of the global community consumes countless energy, which generally depends on fossil fuels because of the low cost of extraction
The present work aims at preparing and characterizing novel polyvinylidene fluoride (PVDF)/LiCoO2 polymeric composites to verify the effect of LiCoO2 nanoparticles on the change of the structural, AC electrical conductivity, electric modulus, and dielectric properties of novel PVDF/LiCoO2 nanocomposites that can be used in Li-ion batteries
X-ray diffraction shows that pure LiCoO2 nanoparticles have diffraction peaks at the values of 2θ ∼ 18.26○, 35.57○, 43.17○, 47.04○, 57.1○, 62.7○, and 66.15○, which are assigned to (003), (101), (104), (015), (107), (018), and (110), respectively
Summary
The development of the global community consumes countless energy, which generally depends on fossil fuels because of the low cost of extraction. One of the greatest characteristics of PVDF is its piezoelectricity (the change in electrical charge in response to the presence of pressure on the polymer), and it exerts pressure in response to an applied electric field (pyroelectricity). This special property of the polymer makes it a good material for transformers in devices, such as headphones, microphones, and acoustic detectors. Because of the promising properties and a large surface area, small pore size, and large porosity that exist within polymer nanocomposites, this and other polymeric nanocomposite materials are promising candidates as a separator and filler material during the manufacture and applications of high-performance Li-ion batteries to use in a wide variety of applications.. Because of the promising properties and a large surface area, small pore size, and large porosity that exist within polymer nanocomposites, this and other polymeric nanocomposite materials are promising candidates as a separator and filler material during the manufacture and applications of high-performance Li-ion batteries to use in a wide variety of applications. The present work aims at preparing and characterizing novel PVDF/LiCoO2 polymeric composites to verify the effect of LiCoO2 nanoparticles on the change of the structural, AC electrical conductivity, electric modulus, and dielectric properties of novel PVDF/LiCoO2 nanocomposites that can be used in Li-ion batteries
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