Complexation of poly(vinylidene fluoride):LiPF6 solid polymer electrolyte with enhanced ion conduction in ‘wet’ form

Chiang, Chin Yeh; Shen, Yi-Ju; Reddy, M. Jaipal; Chu, Peter P.

doi:10.1016/s0378-7753(03)00514-7

Cited by 128 publications

(71 citation statements)

References 28 publications

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“…When CA was incorporated, the peak at 2θ = 19.9°shifts to a higher degree of 2θ = 20.3°w hich represents β (110) and β (200), and the peak at 2θ = 38.4°becomes less prominent, demonstrating that the crystal structure changes from α to β form. In addition, the diffraction peaks broaden gradually, suggesting a decrease in both crystalline size and the degree of crystallinity which can be confirmed by the degree of crystallinity listed in Table 1 as well as the DSC analysis [38]. Both DSC and XRD analyses imply that the growth of the crystals is affected by the interaction of the component.…”

Section: Ft-ir Spectroscopysupporting

confidence: 53%

“…Hence, a large amount of electrolytes can be trapped in amorphous region. On the other hand, there may be interaction between membranes and electrolyte that lone pair electrons of F in PVdF can generate coordination effect with Li + ions in electrolyte, as described in Scheme 2 [41], which facilitated the CA/PVdF (2:8) membrane to get a high electrolyte uptake. But with the increase of CA content further, the electrolyte uptake declines due to the decreasing available F from PVdF.…”

Section: Hydrophilicity and Electrolyte Uptakementioning

confidence: 99%

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Electrospun cellulose acetate/poly(vinylidene fluoride) nanofibrous membrane for polymer lithium-ion batteries

Kang

Zhao

et al. 2016

J Solid State Electrochem

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The membranes for gel polymer electrolyte (GPE) for lithium-ion batteries were prepared by electrospinning a blend of poly(vinylidene fluoride) (PVdF) with cellulose acetate (CA). The performances of the prepared membranes and the resulted GPEs were investigated, including scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC), X-ray diffraction (XRD), porosity, hydrophilicity, electrolyte uptake, mechanical property, thermal stability, AC impedance measurements, linear sweep voltammetry, and charge-discharge cycle tests. The effect of the ratio of CA to PVdF on the performance of the prepared membranes was considered. It is found that the GPE based on the blended polymer with CA:PVdF =2:8 (in weight) has an outstanding combination property-strength (11.1 MPa), electrolyte uptake (768.2 %), thermal stability (no shrinkage under 80°C without tension), and ionic conductivity (2.61 × 10 −3 S cm −1 ). The Li/GPE/ LiCoO 2 battery using this GPE exhibits superior cyclic stability and storage performance at room temperature. Its specific capacity reaches up to 204.15 mAh g −1 , with embedded lithium capacity utilization rate of 74.94 %, which is higher than the other lithium-ion batteries with the same cathode material LiCoO 2 (about 50 %).

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Section: Ft-ir Spectroscopysupporting

confidence: 53%

Section: Hydrophilicity and Electrolyte Uptakementioning

confidence: 99%

Electrospun cellulose acetate/poly(vinylidene fluoride) nanofibrous membrane for polymer lithium-ion batteries

Kang

Zhao

et al. 2016

J Solid State Electrochem

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“…We purposely use the PVDF film with the polarity that results in a positive piezoelectric potential (piezopotential) at the cathode (LiCoO 2 ) side and negative piezopotential at the anode (TiO 2 ) under compressive strain for separating the charges (see section F and Figure S7 in the Supporting Information). Under the driving of the piezoelectric field with a direction from the cathode to the anode, the Li ions in the electrolyte will migrate along the direction through the ionic conduction paths present in the PVDF film separator for ion conduction in order to screen the piezoelectric field, and finally reach the anode, as shown in Figure 2c (note: a PVDF film is an ionic conductor for Li + , which is why PVDF is used as the base for polymer electrolyte 26 and also the binder 27 for electrodes in Li-ion batteries). The decreased concentration of Li + at the cathode will break the chemical equilibrium of the cathode electrode reaction (LiCoO 2 ↔ Li 1−x CoO 2 + xLi + + xe − ), 28 so that Li + will deintercalate from LiCoO 2 , turning it into Li 1−x CoO 2 and leaving free electrons at the current collector (Al foil) of the cathode electrode.…”

mentioning

confidence: 99%

Hybridizing Energy Conversion and Storage in a Mechanical-to-Electrochemical Process for Self-Charging Power Cell

et al. 2012

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Energy generation and energy storage are two distinct processes that are usually accomplished using two separated units designed on the basis of different physical principles, such as piezoelectric nanogenerator and Li-ion battery; the former converts mechanical energy into electricity, and the latter stores electric energy as chemical energy. Here, we introduce a fundamental mechanism that directly hybridizes the two processes into one, in which the mechanical energy is directly converted and simultaneously stored as chemical energy without going through the intermediate step of first converting into electricity. By replacing the polyethylene (PE) separator as for conventional Li battery with a piezoelectric poly(vinylidene fluoride) (PVDF) film, the piezoelectric potential from the PVDF film as created by mechanical straining acts as a charge pump to drive Li ions to migrate from the cathode to the anode accompanying charging reactions at electrodes. This new approach can be applied to fabricating a self-charging power cell (SCPC) for sustainable driving micro/nanosystems and personal electronics. KEYWORDS: Self-charging power cell, mechanical energy, piezoelectricity, lithium ion battery, electrochemistry E nergy conversion and storage 1−3 are the two most important technologies in today's green and renewable energy science, which are usually separated units designed on the basis of vastly different approaches. As for energy harvesting, depending on the nature of energy sources, such as solar, 4−7 thermal, 8 chemical, 9 and mechanical, 10,11 various mechanisms have been developed for effectively converting them into electricity. Take smaller scale mechanical energy as an example, piezoelectric nanogenerators (NGs) have been developed into a powerful approach for converting lowfrequency, biomechanical energy into electricity. 12−14 The mechanism of the NG relies on the piezoelectric potential created by an externally applied strain in the piezoelectric material for driving the flow of electrons in the external load. 12 As for energy storage, Li-ion battery 15−20 is one of the most effective approaches, in which the electric energy is stored as chemical energy through the migration of Li ions under the driving of an externally applied voltage source and the follow up electrochemical reactions occurring at the anode and cathode. 21 In general, electricity generation and energy storage are two distinct processes that are accomplished through two different and separated physical units achieving the conversions from mechanical energy to electricity and then from electric energy to chemical energy, respectively. Here, we introduce a fundamental mechanism that directly hybridizes the two processes into one, through which the mechanical energy is directly converted and simultaneously stored as chemical energy, so that the nanogenerator and the battery are hybridized as a single unit. Such an integrated self-charging power cell (SCPC), which can be charged up by mechanical deformation and vibration from the e...

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“…Meanwhile, the diffraction peaks are substantially broader, indicating that the amorphous state of nano-ppy/OMMT is enhanced. This can improve the ionic conductivity and other electrochemical properties of the ionic liquid gel polymer electrolyte [26][27][28]. Figure 3(a), MMT has a particle size, with a diameter of 1-2 m. However, the lamellar structure of nano-ppy/OMMT, which has a diameter of approximately 50-100 nm, is evident in Figure 3 the proportion of amorphous region increases.…”

Section: Resultsmentioning

confidence: 99%

Effect of Nano-ppy/OMMT on the Physical and Electrochemical Properties of an Ionic Liquid Gel Polymer Electrolyte

Yang

Yao

2018

Journal of Nanomaterials

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A new type of nanopolypyrrole/organically modified montmorillonite-ionic liquid gel polymer electrolyte (ppy/OMMT-ILGPE) is prepared based on nanopolypyrrole/organically modified montmorillonite (ppy/OMMT), N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PP14TFSI), lithium-bis(trifluoromethanesulfonyl) (LiTFSI), polyvinylidene difluoride (PVDF), methyl methacrylate (MMA), and benzoyl peroxide (BPO) by an in situ method. The effect of nano-ppy/OMMT on the physical and electrochemical properties of an ionic liquid gel polymer electrolyte is demonstrated. The results show that nanoppy/OMMT-ILGPE has a porous structure with a large surface area, and the diameter of the pores on the surface is approximately 1-2 m. The Li + transference number of 0.72 is achieved, and the ionic conductivity reaches up to 1.2 × 10 −3 S/cm at room temperature. Nano-ppy/OMMT-ILGPE has good thermal stability and mechanical properties. Meanwhile, nano-ppy/OMMT-ILGPE has fine cycle performance in the Li|nano-ppy/OMMT-ILGPE|LiNi 1/3 Co 1/3 Mn 1/3 O 2 coin cell. The good electrochemistry performance of nano-ppy/OMMT-ILGPE means that it can act as an ideal gel polymer electrolyte material for lithium ion batteries.

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Complexation of poly(vinylidene fluoride):LiPF6 solid polymer electrolyte with enhanced ion conduction in ‘wet’ form

Cited by 128 publications

References 28 publications

Electrospun cellulose acetate/poly(vinylidene fluoride) nanofibrous membrane for polymer lithium-ion batteries

Electrospun cellulose acetate/poly(vinylidene fluoride) nanofibrous membrane for polymer lithium-ion batteries

Hybridizing Energy Conversion and Storage in a Mechanical-to-Electrochemical Process for Self-Charging Power Cell

Effect of Nano-ppy/OMMT on the Physical and Electrochemical Properties of an Ionic Liquid Gel Polymer Electrolyte

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