Composite electrolytes from self-assembled colloidal networks

Walls, Howard; Riley, Michael W.; Fedkiw, Peter S.; Spontak, Richard J.; Baker, Gregory L.; Khan, Saad A.

doi:10.1016/s0013-4686(03)00187-7

Cited by 14 publications

(9 citation statements)

References 19 publications

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“…Similarly, behavior in conductivity was observed by many authors for different types of fillers [112,113] used in the matrix. The rheological properties of these composites were also studied elaborately by Raghavan and Khan et al [114][115][116] in PEG matrix using methyl-group-terminated fumed silica composites many fold enhancement observed. The composites were found to be shear sensitive, and the viscosity decreased on applying external force due to the weak physical bonds between the silica particles.…”

Section: Gel Polymer Electrolytementioning

confidence: 97%

RETRACTED ARTICLE: Polymer electrolytes: characteristics and peculiarities

Ahmad

2009

Ionics

110

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Polymer electrolytes are an important component of many electrochemical devices. This paper reviews stateof-the-art of the electrochemical and physical properties of polymer electrolytes. This review mainly encompasses the properties of different salts, solvents, and polymer hosts, which are encaged in liquid electrolytes. The additions of filler in polymer electrolytes result in composite polymer electrolytes, having high mechanical integrity and ionic conductivity, that are ideal electrolyte for these applications. The next generation state-of-the-art room-temperature ionic liquids based electrolytes, which are far superior to corresponding nonionic solvent-based electrolytes, are also discussed.

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Section: Gel Polymer Electrolytementioning

confidence: 97%

RETRACTED ARTICLE: Polymer electrolytes: characteristics and peculiarities

Ahmad

2009

Ionics

110

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“…Figure presents the FTIR spectra of PVDF−HFP, SiO 2 , Nafion−Li, and the complexes, respectively. The main bands that occur in these spectra are listed in Table . ,,− The characteristic vibration bands of PVDF−HFP are at about 1402 cm -1 for CF groups and about 1200 cm -1 for CF 2 groups (Figure b). , The absorption band at 840 cm -1 is assigned to the characteristic frequency of vinylidene groups. When Nafion−Li is mixed with PVDF−HFP, the doublet bands at about 1140 and 1210 cm -1 (CF 2 symmetric and asymmetric stretching vibration in Nafion−Li) transform into a wide band (Figure d).…”

Section: Resultsmentioning

confidence: 99%

A Single Ionic Conductor Based on Nafion and Its Electrochemical Properties Used As Lithium Polymer Electrolyte

2003

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In an attempt to raise the transport number of Li+ to nearly unity in solid polymer electrolytes, commercial perfluorinated sulfonate acid membrane Nafion 117 was lithiated and codissolved with copolymer poly(vinylidene fluoride)hexafluoropropylene. The effect of fumed silica on the physical and electrochemical properties of the single ion conduction polymer electrolyte was studied with atom force microscopy, fourier transform infrared spectroscopy, differential scanning calorimetry, and electrochemical impedance spectroscopy. It was confirmed that the fumed silica has an obvious effect on the morphology of polymer electrolyte membranes and ionic conductivity. The resulting materials exhibit good film formation, solvent-maintaining capability, and dimensional stability. The lithium polymer electrolyte after gelling with a plasticizer shows a high ionic conductivity of 3.18 × 10-4 S/cm.

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“…To avoid concentration polarization, the free movement of anions needs to be limited or totally eliminated. The former case is realized by incorporation of electronically deficient moieties into the polymer chain, which can act as an anion-trapping site to limit the free movement of anions. , The latter case is realized by covalent attachment of the anions to the polymer backbones − to form single ion conductors with a unity lithium transference number (t 0 + = 1). The second case has been shown by theoretical modeling to be preferred for practical applications …”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Network Single Ion Conductors Based on Comb-Branched Polyepoxide Ethers and Lithium Bis(allylmalonato)borate

2005

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Network single ion conductors (NSICs) based on comb-branch polyepoxide ethers and lithium bis(allylmalonato) borate have been synthesized and thoroughly characterized by means of ionic conductivity measurements, electrochemical impedance, and cycling in symmetrical Li/Li half cells, Li/V 6 O 13 full cells in which a NSIC was used as both binder and electrolyte in the cathode electrode and as the electrolyte separator membrane, and by dynamic mechanical analysis (DMA). The substitution of the trimethylene oxide (TMO) unit into the side chains in place of ethylene oxide (EO) units increased the polymer-ion mobility (lower glass transition temperature). However, the ionic conductivity was nearly one and half orders of magnitude lower than the corresponding pure EO-based single ion conductor at the same salt concentration, which may be ascribed to the lower dielectric constant of the TMO side chains that result in a lower concentration of free conducting lithium cations. For a highly cross-linked system (EO/Li ) 20), only 47 wt % plasticizing solvent (ethylene carbonate (EC)/ethyl methyl carbonate (EMC), 1/1 by wt) could be taken up, and the ionic conductivity was only increased by 1 order of magnitude over the dry polyelectrolyte, while for a less densely cross-linked system (EO/Li ) 80), up to 75 wt % plasticizer could be taken up and the ionic conductivity was increased by nearly 2 orders of magnitude. A Li/Li symmetric cell that was cycled at 85 °C at a current density of 25µA cm -2 showed no concentration polarization or diffusional relaxation, which was consistent with a lithium ion transference number of 1. However, both the bulk and interfacial impedance increased after 20 cycles, which was apparently due to continued cross-linking reactions within the membrane and on the surface of the lithium electrodes. A Li/V 6 O 13 full cell constructed using a single ion conductor gel (propylene carbonate (PC)/EMC, 1/1 in wt) was cycled at 25 °C at a current density of 25µA cm -2 and showed an initial capacity of 268 mAh g -1 of V 6 O 13 , which stabilized at around 200 mAh g -1 after the first 20 cycles. During the DMA measurements on the NSICs, it was found that besides the main glass transition (R transition) there was a distinct secondary glass transition (β transition) for NSICs having five EO units in the side chains, while this (the secondary transition) was not clearly visible in the network single ion conductors (NSICs) with shorter side chains (two, three, and four EO units). The main glass transition (R transition) was attributed to the whole network structure of the single ion conductors and secondary glass transition (β transition) appeared to be due to the complexation of lithium by the side-chain chains. Both the main glass transition and the secondary transition were found to shift to higher temperature with increasing salt concentration.

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Composite electrolytes from self-assembled colloidal networks

Cited by 14 publications

References 19 publications

RETRACTED ARTICLE: Polymer electrolytes: characteristics and peculiarities

RETRACTED ARTICLE: Polymer electrolytes: characteristics and peculiarities

A Single Ionic Conductor Based on Nafion and Its Electrochemical Properties Used As Lithium Polymer Electrolyte

Synthesis and Characterization of Network Single Ion Conductors Based on Comb-Branched Polyepoxide Ethers and Lithium Bis(allylmalonato)borate

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