Department of Chemistry
Permanent URI for this collectionhttp://localhost:4000/handle/123456789/1924
Browse
3 results
Search Results
Item Enhanced electrical transport in ionic liquid dispersed TMAI-PEO solid polymer electrolyte(AIP, 2015-02-17) Kumar, Anil; Dalvi, AnshumanA polymer composite is prepared by dispersing ionic liquid [Bmim][BF4] in Polyethylene oxide-tetra methyl ammonium iodide composite and subsequent microwave treatment. X-ray diffraction patterns confirm the composite nature. To explore possibility of proton conductivity in these films, electrical transport is studied by impedance spectroscopy and DC polarization. It is revealed that addition of ionic liquid in host TMAI-PEO solid polymer electrolyte enhances the conductivity by ∼ 2 orders of magnitude. Polarization measurements suggest that composites are essentially ion conducting in nature. The maximum ionic conductivity is found to be ∼2 × 10−5 for 10 wt % ionic liquid.Item Li2SO4⎯Li2O⎯P2O5 ionic glass dispersed with [Bmim] [PF6] ionic liquid: Electrical transport and thermal stability investigations(AIP, 2014-02-17) Kumar, Anil; Dalvi, AnshumanA fast ionic composite is prepared by dispersion of Ionic liquid [Bmim][PF6] in Li2SO4⎯Li2O⎯P2O5 glass matrix by mixing and through grinding. Amorphous/glassy nature of the samples is confirmed by X-Ray diffraction (XRD). Surprisingly, the electrical conductivity of the samples is found to be increasing by ∼ 2 orders of magnitude and exhibits typical Arrhenius behavior with low activation energy. DC polarization and impedance spectroscopy measurements suggest that samples are essentially ionic in nature. The conductivity isotherms were also obtained at different temperatures (T < 100 °C) and found to be appreciably stable at least for ∼ 10 days.Item Ionic liquid dispersed Li+ ion oxide glasses and glass-ceramics: Assessment of electrical transport and thermal stability(Elsiever, 2015-12-01) Kumar, Anil; Dalvi, AnshumanEffect of ionic liquid (BMIM BF4) dispersion on Li+ ion oxide glass and glass-ceramics has been investigated. Addition of ionic liquid in a very small amount (0.5–5 wt.%) enhances the ionic conductivity significantly. For a typical glass composition 60Li2SO4-40(0.5Li2O–0.5P2O5), with grain size of ~ 50 nm, dispersion of ~ 5 wt.% ionic liquid leads to a conductivity rise of ~ 2–4 orders of magnitude. Structure of ionic liquid dispersed glass and glass-ceramic composites has been investigated by X-ray diffraction and FE-SEM, and thermal properties by DSC. It has been revealed by a galvanic cell method, impedance spectroscopy and dc polarization technique that these composites are essentially ionic in nature. Based on these investigations, a model for electrical transport has been proposed according to which Li+ ions are the majority charge carriers in these composites. The model suggests that ionic liquid acts like a filler between the glass/glass-ceramic grains and Li+ ions mainly migrate through these channels. These composites appear promising for Li+ ion battery applications.