NMR studies of ionic mobility in polymer gel electrolytes for advanced lithium batteries

Ward, I. M.; Williamson, Mark J.; Hubbard, Hugh V.St.A.; Southall, Jake; Davies, G. R.

doi:10.1016/s0378-7753(98)00232-8

Cited by 30 publications

(23 citation statements)

References 14 publications

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“…29 Ward et al studied conductivity measurements for PVdF-DMF-LiT gel electrolytes up to 858C. 30 The 1 H NMR results indicate the existence of DMF in the PVAc : DMF : LiClO 4 polymer electrolyte matrix at 308C. However, TG results reveal that evaporation of DMF has been started at 618C, and the rate of evaporation increases when the temperature increases above 1008C as shown in Table IV.…”

Section: Tg/dta Analysismentioning

confidence: 99%

¹H NMR, thermal, and conductivity studies on PVAc based gel polymer electrolytes

Baskaran

Selvasekarapandian

Kuwata

et al. 2008

J of Applied Polymer Sci

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The lithium-ion conducting gel polymer electrolytes (GPE), PVAc-DMF-LiClO 4 of various compositions have been prepared by solution casting technique. 1 H NMR results reveal the existence of DMF in the gel polymer electrolytes at ambient temperature. Structure and surface morphology characterization have been studied by X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM) measurements. Thermal and conductivity behavior of polymer-and plasticizer-salt complexes have been studied by differential scanning calorimetry (DSC), TG/DTA, and impedance spectroscopy results. XRD and SEM analyses indicate the amorphous nature of the gel polymer-salt complex. DSC measurements show a decrease in T g with the increase in DMF concentrations. The thermal stability of the PVAc : DMF : LiClO 4 gel polymer electrolytes has been found to be in the range of (30-608C). The dc conductivity of gel polymer electrolytes, obtained from impedance spectra, has been found to vary between 7.6 Â 10 À7 and 4.1 Â 10 À4 S cm À1 at 303 K depending on the concentration of DMF (10-20 wt %) in the polymer electrolytes. The temperature dependence of conductivity of the polymer electrolyte complexes appears to obey the VTF behavior.

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Section: Tg/dta Analysismentioning

confidence: 99%

¹H NMR, thermal, and conductivity studies on PVAc based gel polymer electrolytes

Baskaran

Selvasekarapandian

Kuwata

et al. 2008

J of Applied Polymer Sci

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“…Other methods have been employed to probe the ion-ion interactions such as Raman spectroscopy as well as using the Walden product and limiting molar conductivities [16,17], however the use of the Nernst-Einstein equation to predict conductivity was been proven to be effective for both liquid electrolytes [18,19,20,21,22,23] and polymer gel electrolytes [24,25,26,27] and has been shown to yield a good approximation of the ionic interactions.…”

Section: Introductionmentioning

confidence: 99%

Pulsed-Field Gradient NMR Self Diffusion and Ionic Conductivity Measurements for Liquid Electrolytes Containing LiBF4 and Propylene Carbonate

Richardson

Voice

Ward

2014

Electrochimica Acta

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Page 1 of 42A c c e p t e d M a n u s c r i p t 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 AbstractLiquid electrolytes have been prepared using lithium tetrafluoroborate (LiBF 4 ) and propylene carbonate (PC). Pulsed-field gradient nuclear magnetic resonance (PFG-NMR) measurements were taken for the cation, anion and solvent molecules using lithium ( 7 Li), fluorine ( 19 F) and hydrogen ( 1 H) nuclei, respectively. It was found that lithium diffusion was slow compared to the much larger fluorinated BF 4 anion likely resulting from a large solvation shell of the lithium. Ionic conductivity and viscosity have also been measured for a range of salt concentrations and temperatures. By comparing the measured conductivity with a ideal predicted conductivity derived from the Nernst-Einstein equation and self diffusion coefficients the degree of ionic association of the anion and cation was determined and was observed to increase with salt concentration and temperature. Using the measured viscosity and self diffusion coefficients the effective radius of each of the species was determined for various salt concentrations.

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“…NMR diffusion measurements have been proven to be a useful tool in understanding the mobility in polymer gel electrolytes [29,30,31,32,16,33,34]. However, the possibility of multiple diffusive species of both the lithium ions and solvent molecules is discussed in this paper, which has previously been reported by us [18] and also in a publication by Magistris et al [17].…”

Section: Conducting Polymer Electrolyte Research At the University Ofmentioning

confidence: 72%

NMR self diffusion and relaxation time measurements for poly (vinylidene fluoride) (PVDF) based polymer gel electrolytes containing LiBF and propylene carbonate

Richardson

Voice

Ward

2016

Polymer

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NMR studies of ionic mobility in polymer gel electrolytes for advanced lithium batteries

Cited by 30 publications

References 14 publications

¹H NMR, thermal, and conductivity studies on PVAc based gel polymer electrolytes

¹H NMR, thermal, and conductivity studies on PVAc based gel polymer electrolytes

Pulsed-Field Gradient NMR Self Diffusion and Ionic Conductivity Measurements for Liquid Electrolytes Containing LiBF4 and Propylene Carbonate

NMR self diffusion and relaxation time measurements for poly (vinylidene fluoride) (PVDF) based polymer gel electrolytes containing LiBF and propylene carbonate

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NMR studies of ionic mobility in polymer gel electrolytes for advanced lithium batteries

Cited by 30 publications

References 14 publications

1H NMR, thermal, and conductivity studies on PVAc based gel polymer electrolytes

1H NMR, thermal, and conductivity studies on PVAc based gel polymer electrolytes

Pulsed-Field Gradient NMR Self Diffusion and Ionic Conductivity Measurements for Liquid Electrolytes Containing LiBF4 and Propylene Carbonate

NMR self diffusion and relaxation time measurements for poly (vinylidene fluoride) (PVDF) based polymer gel electrolytes containing LiBF and propylene carbonate

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¹H NMR, thermal, and conductivity studies on PVAc based gel polymer electrolytes

¹H NMR, thermal, and conductivity studies on PVAc based gel polymer electrolytes