The effects of SiO 2 and TiO 2 nanofillers on structural and electrochemical properties of poly(ethylene oxide)–EMIHSO 4 electrolytes

Ketabi, Sanaz; Lian, Keryn

doi:10.1016/j.electacta.2014.12.036

Cited by 35 publications

(23 citation statements)

References 40 publications

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“…The manual bending, twisting, and touching operations realize that the NSPE0 film is little sticky and relatively more flexible whereas the stickiness and flexibility of the NSPE films reduce with the increase of TiO 2 concentration. These manual observations infer that the TiO 2 loading increases the mechanical strength of the NSPE films which are in agreement with earlier experimental results on the TiO 2 containing other NSPE films [57,58,62].…”

Section: Measurementssupporting

confidence: 93%

“…The NSPE0 (primary SPE without nanofiller) film displays the characteristic peaks of PEO (19.11° and 23.38°) but their intensities are much lower than that of the pristine PEO film [33] revealing that a large amount of PEO crystallites have turned into amorphous content due to formation of ion-dipole complexes. A significant intensity β-phase (20.53°), a very low intensity γ-phase (22.02°), and also α-phase (36.32°) crystals peaks in the XRD pattern of this film confirms the PVDF polymorphism [15,42,44,62]. Further, as compared to peaks intensities and positions of NSPE0 film, it is found that there is an increase in intensities of the PEO and PVDF peaks with a small change in their positions for the NSPE2 film (see 2θ and I values given in Table 1).…”

Section: Xrd Spectra and Crystal Structuressupporting

confidence: 65%

“…A survey of literature confirms that for the lithium-ion conducting SPE materials, the LiClO 4 is one of the appealing ionic dopants used enormously for the preparation of SPEs [10,23,27,33,36]. The investigations on numerous NSPE materials have claimed that the dispersion of TiO 2 nanoparticles mostly increases the ionic conductivity, and some studies also reported an unexpected increase by a few orders of magnitude [22,23,30,[49][50][51][52][53][54][55][56][57][58][59][60][61][62]. Some studies have concluded that only the acidic groups surface-modified TiO 2 and some other inorganic nanofillers are effective in increasing the conductivity of the NSPE materials [63,64].…”

Section: Introductionmentioning

confidence: 94%

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Dielectric polarization and relaxation processes of the lithium-ion conducting PEO/PVDF blend matrix-based electrolytes: effect of TiO2 nanofiller

Dhatarwal

Sengwa

2020

SN Appl. Sci.

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The effect of TiO 2 nanofiller concentration on the dielectric polarization and relaxation processes of (75PEO/25PVDF)/25 wt% LiClO 4-x wt% TiO 2 (x = 0, 2, 5, 10, 15, and 20) compositions based nanocomposite solid polymer electrolyte (NSPE) films has been investigated by employing the dielectric relaxation spectroscopy. The SEM micrographs demonstrate that the dispersion of TiO 2 nanoparticles enormously alters the spherulitic morphology with the development of some cracks, pores, and wrinkles of these solution-cast prepared NSPE films. The X-ray diffraction study confirms that the heterostructures of these NSPE materials are semicrystalline and their degree of crystallinity increases irregularly with the increase of TiO 2 concentration, however the crystallinity of host polymer blend matrix of these electrolytes decreases. The complex dielectric permittivity spectra of these NSPE materials in the frequency range from 20 Hz to 1 MHz at 27 °C reveal that there is a dominant contribution of electrode polarization and interfacial polarization at lower frequencies, whereas the high frequency permittivity values attribute to dipolar and ionic polarizations. Four types of relaxation processes have been probed by the 'master curve representation' of the dielectric and electrical spectra of these solid ion-dipole complexes. It is observed that the addition of TiO 2 nanoparticles up to 10 wt% in these electrolytes influences the dielectric properties anomalously, but a huge decrease in the dielectric polarization and increase in the relaxation times are noted resulting in a significant decrease in the ionic conductivity of the film at 20 wt% TiO 2 concentration. The dependence of dc ionic conductivity of these lithium-ion conducting NSPE materials on the chain segmental relaxation time and also the degree of crystallinity has been explored. The results of these NSPE materials have also been compared with the TiO 2 nanoparticles loaded different polymer matrices and salts based electrolytes and discussed appropriately. These lithium-ion based electrolyte films are accredited for the solid-state ion-conducting energy storing devices from their electrochemical parameters characterized by LSV, CV, and CA techniques.

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Section: Measurementssupporting

confidence: 93%

Section: Xrd Spectra and Crystal Structuressupporting

confidence: 65%

Section: Introductionmentioning

confidence: 94%

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Dielectric polarization and relaxation processes of the lithium-ion conducting PEO/PVDF blend matrix-based electrolytes: effect of TiO2 nanofiller

Dhatarwal

Sengwa

2020

SN Appl. Sci.

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“…49 New lithium difluoro(oxalato)borate LiDFOB salt was proposed by Polu. 53 In poly(ethylene oxide) -1-ethyl-3-methylimidazolium hydrogen sulfate electrolyte, SiO 2 and TiO 2 nanofillers were tested by Ketabi and Lian (2015) 65 as plasticizers for inhibiting the crystallization of the polymer chains. Analysis of the numerous publications reveals that, notwithstanding these strenuous efforts, the maximum conductivity of polymer electrolytes is close to 10 −5 S cm −1 and very rarely approaches 10 −4 S cm −1 at room temperature.…”

Section: Discussionmentioning

confidence: 99%

“…64 In the (PEO)-1-ethyl-3-methylimidazolium hydrogen sulfate (EMIHSO4) electrolyte, SiO 2 and TiO 2 nanofillers acted primarily as "plasticizers" by inhibiting the crystallization of the polymer chains and doubled the ionic conductivity. 65 Fillers with high dielectric constants increased the polarity of the polymer electrolyte and thus promoted ionic dissociation. Wang et al 66 showed that enhanced ionic conductivity in a classic polymer electrolyte can be achieved by controlling the conducting pathway by means of a core-shell structure.…”

Section: Amorphous Polymer Electrolytesmentioning

confidence: 99%

Review—On Order and Disorder in Polymer Electrolytes

Golodnitsky

Strauss

Greenbaum

2015

J. Electrochem. Soc.

203

135

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This contribution presents an overview of more than three-decades-long studies of the structure and mechanism of ion conduction in polyethylene-oxide-based solid polymer electrolytes. Conductivity in polymer electrolytes has long been viewed as confined to the amorphous phase above the glass-transition temperature (Tg). Above Tg, polymer chain motion creates a dynamic, disordered environment that was thought to play a critical role in facilitating ion transport. Difficulty of finding the amorphous polymer with sufficient ionic conductivity has raised the fundamental question of whether polymer electrolytes are intrinsically inferior to other electrolytes in terms of their charge-transport capability. Recently, enhanced ionic conductivity has been detected in ordered (longitudinally stretched and cast under gradient magnetic field) polymer electrolytes, in crystalline ion-polyether 1:6 complexes and polymer-in-salt electrolytes. These results have opened a new trend in the search for ion transport in solid polymer electrolytes. The very latest publications present new hybrid-and block-co-polymers, a new class of functional materials (polymerized ionic liquids), and new promising approaches aimed at the development of polymer-based superionic conductors with rigid nanochannel architectures that enable rapid ion transport decoupled from segmental relaxation. Solid Polymer Electrolytes-Structure and Mechanism of Ion TransportMuch research deals with high-ionic-conductive polymer electrolytes because of their current and potential applications as electrochromic and temperature-sensitive printed electronics devices, biomedical sensors, supercapacitors, solar cells and batteries. Polymer electrolytes offer pronounced advantages over conventional liquid electrolytes. These include: a versatile shape, mechanical strength and stable contact between the electrode and electrolyte interfaces. In addition, solid electrolytes are safer than liquid electrolytes as they do not have a leakage problem and because of their nontoxic, low-vaporpressure, and non-flammable properties. [1][2][3][4][5][6][7] Ion-polyether complexes (or polymer electrolytes) were first discovered by Fenton, Parker and Wright in 1973. 8 Since then, such complexes have been prepared with many different monatomic ions and indeed many different polymeric ligands. Armand in 1979 recognized that Li + -polyether complexes could be used as solid electrolytes in electrochemical devices. 9The classic polymer electrolyte comprises organic macromolecules (usually polyether polymer) that are complexed with inorganic salts. The polymer matrix must contain a Lewis base (e.g. ethylene-oxide unit, -OCH 2 CH 2 -) to solvate the lithium salt. The salt-solvent mixing entropy consists mainly of two components: translational and configurational. Contrary to the case of water, the mixing entropy for the formation of polymer electrolytes is small or even positive. The incorporation of salts into the polymer inevitably reduces the freedom of polymer-chain motion, thus causing ...

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High Performance Composite Polymer Electrolytes for Lithium‐Ion Batteries

Fan

Líu

Marosz

et al. 2021

Adv Funct Materials

190

108

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Today, there is an urgent demand to develop all solid‐state lithium‐ion batteries (LIBs) with a high energy density and a high degree of safety. The core technology in solid‐state batteries is a solid‐state electrolyte, which determines the performance of the battery. Among all the developed solid electrolytes, composite polymer electrolytes (CPEs) have been deemed as one of the most viable candidates because of their comprehensive performance. In this review, the limitations of traditional solid polymer electrolytes and the recent progress of CPEs are introduced. The effect and mechanism of inorganic fillers to the various properties of electrolytes are discussed in detail. Meanwhile, the factors affecting ionic conductivity are intensively reviewed. The recent representative CPEs with synthetic fillers and natural clay‐based fillers are highlighted because of their great potential. Finally, the remaining challenges and promising prospects are outlined to provide strategies to develop novel CPEs for high‐performance LIBs.

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The effects of SiO 2 and TiO 2 nanofillers on structural and electrochemical properties of poly(ethylene oxide)–EMIHSO 4 electrolytes

Cited by 35 publications

References 40 publications

Dielectric polarization and relaxation processes of the lithium-ion conducting PEO/PVDF blend matrix-based electrolytes: effect of TiO2 nanofiller

Dielectric polarization and relaxation processes of the lithium-ion conducting PEO/PVDF blend matrix-based electrolytes: effect of TiO2 nanofiller

Review—On Order and Disorder in Polymer Electrolytes

High Performance Composite Polymer Electrolytes for Lithium‐Ion Batteries

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