Investigations on lithium acetate-doped PVA/PVP solid polymer blend electrolytes

Sundaramahalingam, K.; Muthuvinayagam, M.; Nallamuthu, N.; Vanitha, D.; Vahini, M.

doi:10.1007/s00289-018-02670-2

Cited by 61 publications

(32 citation statements)

References 57 publications

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“…The transmission spectra of FT‐IR for the pure PVAL and different concentrations (0.04 wt%, 0.19 wt%, 0.4 wt%, 1.9 wt%, and 4 wt%) of Li + ‐ions are shown in Figure 3A in the interval between 500 and 4000 cm −1 . A wide transmission band between 3121 and 3506 cm −1 has been observed for all films, and it is ascribed to the ‐OH stretching hydroxyl group vibration 17 . This consequence confirms the existence of a large number of free OH groups in PVAL polymer samples.…”

Section: Resultssupporting

confidence: 67%

“…Figure 1A shows the XRD spectra drawn from 10° to 70 o wt% for PVAL, LiNO 3 , and doped PVAL samples. The pure PVAL film pattern shows a monoclinic crystalline reflectance with a significant peak at 2θ = 20.04°, correlates to (101) plane 17 . This behavior demonstrates that the film of PVAL is semi‐crystalline.…”

Section: Resultsmentioning

confidence: 83%

“…The band observations at 1060 to 1149 cm −1 are typically taken as an evaluation method for the crystalline structure of PVAL (C‐O stretching of the acetyl group). As many literature works have pointed out, the IR analyzes of PVAL polymers have shown how the bandwidth widening and intensity reduction at 1060 to 1149 cm −1 is strongly associated with the increase in the PVAL amorphous phase 17,23 . With increasing concentrations of LiNO 3 doping, it was observed that the bandwidth of 1060 to 1149 cm −1 peak increases and its intensity gradually reduced and disappeared entirely for the SPL‐5 sample.…”

Section: Resultsmentioning

confidence: 86%

“…As a result, the hydrogen bond is broken and the Li + ‐ions occupy the hydrogen bond position in the PVAL matrix. Dislocations resulting from the displacement of hydrogen bonds by Li + ‐ions have been noted to broaden the diffracted X‐ray peak, indicating the increase of the PVAL polymer's amorphous nature with an increase in the concentration of lithium nitrate 17 . The results can be confirmed from the crystallite size ( D ) and the internal strain ( ε ) values, which were calculated from the following relations 19 :

D = \frac{0.9 λ}{β \cos θ},

ε = \frac{β}{4 \tan θ},

where θ and β are the position of the semi‐crystalline peak of PVAL and the peak broadening.…”

Section: Resultsmentioning

confidence: 99%

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Structural, electrical, and nonlinear optical performance of PVAL embedded with Li⁺‐ions for multifunctional devices

Ali

Abdelaziz

Nawar

et al. 2020

Polymers for Advanced Techs

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In this paper, pure and 0.04%, 0.19%, 0.4%, 1.9%, and 4% LiNO3‐doped PVAL (polyvinyl alcohol) electrolyte were fabricated in the form of solid films by the casting process. The influence of Li+‐ions on PVAL was identified by some characterization tools such as X‐ray diffraction, FT‐IR (Fourier transform infrared), scanning electron microscope (SEM), thermal gravimetric analysis (TGA), UV‐visible‐NIR spectroscopy, dielectric, and conductivity measurements. X‐ray diffraction studies indicate that the semicrystalline of PVAL and the calculated crystallize size from Gaussian fitting were decreased with Li+‐ions concentration. FT‐IR results indicate that there is strong interaction among doping ions and the matrix. The surface morphology of the electrolyte films was studied via SEM. The optical studies demonstrate that the transmittance of films decreased with the rising of Li+‐ions. Urbach's energy and bandgap are also reduced with adding more ions. Different empirical equations were used to study the relation between the energy gap and the refractive index. The index of refraction of the films has average values in 2.024 to 2.078 range. Li+‐ion concentrations critically influenced the factors of nonlinearity. The calculated values of nonlinear optical susceptibility χ(3) and refractive index n2 were increased from 8.6 × 10−13 esu and 1.55 × 10−11 to 20.56 × 10−10 esu and 2.05 × 10−11, respectively. The dielectric constant and loss measurements of the PVAL embedded with 4% of LiNO3 (SPL‐5) were decreased exponentially with increasing the incident frequency. The AC electrical conductivity (σAC) and nonlinear I‐V curves are enhanced by increasing the Li+‐ion contents. The electrical current was increased with small resistivity for SPL‐5 film. The studied films have an inimitable result in various fields, such as nonlinear optical and varistor devices.

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Section: Resultssupporting

confidence: 67%

Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 86%

D = \frac{0.9 λ}{β \cos θ},

ε = \frac{β}{4 \tan θ},

where θ and β are the position of the semi‐crystalline peak of PVAL and the peak broadening.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Structural, electrical, and nonlinear optical performance of PVAL embedded with Li⁺‐ions for multifunctional devices

Ali

Abdelaziz

Nawar

et al. 2020

Polymers for Advanced Techs

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“…In contrast to inorganic counterparts with a brittle crystalline phase, the solid polymer electrolyte (SPE) exhibits excellent interfacial compatibility, and superior elasticity to endure greater mechanical deformation, contributing to be cast into the complicated architectures for lithium-ion and lithium-metal batteries [ 3 , 4 , 5 ]. Consequently, a wide array of polymers such as poly (ethylene oxide) (PEO) [ 6 , 7 , 8 , 9 ], polyacrylonitrile (PAN) [ 10 , 11 , 12 , 13 ], poly (vinylidene fluoride) (PVdF) [ 14 , 15 ], and its copolymer with hexafluoropropylene (PVdF-HFP) [ 16 , 17 ], poly (methyl methacrylate) (PMMA) [ 18 , 19 , 20 ], and poly (vinyl alcohol) (PVA) [ 21 , 22 , 23 , 24 ], as well as their mixtures [ 25 , 26 , 27 , 28 ], have been adopted as the potential matrices for solid electrolytes. Especially, the outstanding inherent advantages (nontoxicity, biocompatibility, biodegradable, good mechanical strength, relatively high dielectric constant, and charge storage capacity) of PVA make it one of the preferred choices for such applications [ 29 , 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Integrity Degradation and Control of All-Solid-State Lithium Battery with Physical Aging Poly (Vinyl Alcohol)-Based Electrolyte

Zhou

et al. 2020

Polymers

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Ensuring the material durability of an electrolyte is a prerequisite for the long-term service of all-solid-state batteries (ASSBs). Herein, to investigate the mechanical integrity of a solid polymer electrolyte (SPE) in an ASSB upon electrochemical operation, we have implemented a sequence of quasi-static uniaxial tension and stress relaxation tests on a lithium perchlorate-doped poly (vinyl alcohol) electrolyte, and then discussed the viscoelastic behavior as well as the strength of SPE film during the physical aging process. On this basis, a continuum electrochemical-mechanical model is established to evaluate the stress evolution and mechanical detriment of aging electrolytes in an ASSB at a discharge state. It is found that the measured elastic modulus, yield stress, and characteristic relaxation time boost with the prolonged aging time. Meanwhile, the shape factor for the classical time-decay equation and the tensile rupture strength are independent of the aging history. Accordingly, the momentary relaxation modulus can be predicted in terms of the time–aging time superposition principle. Furthermore, the peak tensile stress in SPE film for the full discharged ASSB will significantly increase as the aging proceeds due to the stiffening of the electrolyte composite. It may result in the structure failure of the cell system. However, this negative effect can be suppressed by the suggested method, which is given by a 2D map under different lithiation rates and relative thicknesses of the electrolyte. These findings can advance the knowledge of SPE degradation and provide insights into reliable all-solid-state electrochemical device applications.

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Mechanical properties of polyvinylpyrrolidone/polyvinyl alcohol‐based solid electrolytes

Orisekeh

Anye

Oyewole

et al. 2022

J of Applied Polymer Sci

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The demand for flexible, lightweight, and long-lasting energy devices has stimulated interest in solid polymer blends. The conventional lithium-ion batteries use liquid electrolytes that are chemically unstable due to the presence of carbonates, which are highly volatile and flammable, creating a significant safety risk. Therefore, the need for the development of solid-state electrolytes that are safe, environmentally friendly, with robust mechanical properties. In this work, the solid polymer blend is explored using a mixture of a polymer matrix of polyvinylpyrrolidone/polyvinyl alcohol and lithium perchlorate salt. The produced films are characterized using a scanning electron microscopy, X-ray diffraction, and Fourier transform infrared. The mechanical properties of the flexible films are also measured using nanoindentation techniques, statistical deconvolution mapping, tensile tests, and fracture toughness measurements. (Young's modulus of 6.87 GPa, hardness of 1.3 GPa, tensile strength of 4.3 MPa, and fracture toughness of 0.81 MPa.m 0.5 ) The implications of the results are then discussed for potential applications of robust solid polymer blends-based electrolytes.

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Investigations on lithium acetate-doped PVA/PVP solid polymer blend electrolytes

Cited by 61 publications

References 57 publications

Structural, electrical, and nonlinear optical performance of PVAL embedded with Li⁺‐ions for multifunctional devices

Structural, electrical, and nonlinear optical performance of PVAL embedded with Li⁺‐ions for multifunctional devices

Mechanical Integrity Degradation and Control of All-Solid-State Lithium Battery with Physical Aging Poly (Vinyl Alcohol)-Based Electrolyte

Mechanical properties of polyvinylpyrrolidone/polyvinyl alcohol‐based solid electrolytes

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Investigations on lithium acetate-doped PVA/PVP solid polymer blend electrolytes

Cited by 61 publications

References 57 publications

Structural, electrical, and nonlinear optical performance of PVAL embedded with Li+‐ions for multifunctional devices

Structural, electrical, and nonlinear optical performance of PVAL embedded with Li+‐ions for multifunctional devices

Mechanical Integrity Degradation and Control of All-Solid-State Lithium Battery with Physical Aging Poly (Vinyl Alcohol)-Based Electrolyte

Mechanical properties of polyvinylpyrrolidone/polyvinyl alcohol‐based solid electrolytes

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Structural, electrical, and nonlinear optical performance of PVAL embedded with Li⁺‐ions for multifunctional devices

Structural, electrical, and nonlinear optical performance of PVAL embedded with Li⁺‐ions for multifunctional devices