Nuclear magnetic resonance and conductivity study of HEC/polyether-based polymer electrolytes

Tambelli, Caio Eduardo de Campos; Donoso, José Pedro; Regiani, Anelise Maria; Pawlicka, Agnieszka; Gandini, Alessandro; LeNest, Jean-François

doi:10.1016/s0013-4686(00)00768-4

Cited by 41 publications

(21 citation statements)

References 23 publications

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“…Solid-state NMR has the advantage of being able to selectively measure the dynamics of the different species in the polymer electrolytes. [25][26][27][28][29][30] For example, measurements of spin-lattice relaxation rates, as a function of temperature, have been used to study the correlation between the cationic and the polymer chain segmental motions in SPEs. We used 13 C CP/MAS NMR spectrum to characterize the interactions between PEO (or PAN) and LiClO 4 in LiClO 4 -PEO-PAN hybrid polymer electrolyte.…”

Section: Solid-state Nmr Analysismentioning

confidence: 99%

New solid polymer electrolytes based on PEO/PAN hybrids

et al. 2005

J of Applied Polymer Sci

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Hybrid polymer dry electrolytes comprised of poly(ethylene oxide) (PEO), polyacrylonitrile (PAN), and LiClO 4 were investigated. The impedance spectroscopy showed that the effect of PAN on the ion conductivity of PEO-based electrolytes depends on the concentration of lithium salt. When the mole ratio of lithium to oxygen is 0.062 (15%LiClO 4 -PEO), adding PAN will increase the ionic conductivity. Differential scanning calorimetry, NMR, and IR data suggested that the enhanced conductivity was due to both the decreasing of the PEO crystallinity and increasing of the degree of ionization of lithium salt. There was obviously no interaction between PAN and lithium ions, and PAN acts as a reinforcing filler, and hence contributes to the mechanical strength besides reducing the crystallinity of the polymer electrolytes. When the LiClO 4 -PEO-PAN hybrid polymer electrolyte was heated at 200°C under N 2 , PAN crosslinked partially, which further decreased the crystallinity of PEO and increased the ionic conductivity, and at the same time prevented the recrystallization of PEO upon sitting at ambient environment.

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Section: Solid-state Nmr Analysismentioning

confidence: 99%

New solid polymer electrolytes based on PEO/PAN hybrids

et al. 2005

J of Applied Polymer Sci

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“…Polymer electrolytes obtained from natural polymers such as starch and cellulose derivatives like hydroxyethylcellulose and hydroxypropylcellulose have attracted attention in recent times because of their superior mechanical and electrical properties [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Conductivity studies of starch-based polymer electrolytes

Khiar

Arof

2009

Ionics

170

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A proton-conducting polymer electrolyte based on starch and ammonium nitrate (NH 4 NO 3 ) has been prepared through solution casting method. Ionic conductivity for the system was conducted over a wide range of frequency between 50 Hz and 1 MHz and at temperatures between 303 K and 373 K. Impedance analysis shows that sample with 25 wt.% NH 4 NO 3 has a smaller bulk resistance (R b ) compared to that of the pure sample. The amount of NH 4 NO 3 was found to influence the proton conduction; the highest obtainable room temperature conductivity was 2.83×10 −5 S cm −1 , while at 100°C, the conductivity in found to be 2.09×10 −4 S cm −1 . The dielectric analysis demonstrates a non-Debye behavior. Transport parameters of the samples were calculated using the Rice and Roth model and thus shows that the increase in conductivity is due to the increase in the number of mobile ions.

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“…As examples, grafted hydroxyethylcellulose [13] and hydroxypropylcellulose [14], modified starch [15,16], chitosan [17,18], or gelatin [19] have been used to prepare electrolytes achieving Li + or H + ions conductivity values as high as 10 −5 S/cm at room temperature. Also, small ECDs with good color/bleaching properties have been already manufactured with these SPEs [15,20,21].…”

Section: Introductionmentioning

confidence: 99%

Gelatin-based protonic electrolyte for electrochromic windows

Al-Kahlout

Vieira

Avellaneda

et al. 2009

Ionics

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Proton-conducting gel polymer electrolytes based on gelatin plasticized with glycerol and containing acetic acid were investigated, characterized, and applied to electrochromic window. For glycerol contents varying from 7% to 48%, the conductivity of the uniform and predominantly amorphous gel electrolyte was found to follow a Vogel-Tamman-Fulcher behavior with the temperature. Typically, for the electrolyte chosen to make 7×2 cm 2 electrochromic smart window with the configuration: glass/ fluor-doped tin oxide (FTO)/WO 3 /gelatin electrolyte/CeO 2 -TiO 2 /FTO/glass and containing 28% of glycerol, the conductivities were found to be of the order of 5×10 −5 S/cm at room temperature and 3.6×10 −4 S/cm at 80°C. The device was characterized by spectroelectrochemical techniques and was tested up to 10,000 cycles showing a fast coloring/ bleaching behavior, where the coloring process was achieved in 10 s and the bleaching in 2 s. The transmission variation at the wavelength of 550 nm was about 15%. The cyclic voltammograms showed a very good reversibility of the cathodic/anodic processes, and the charge density was about 3.5 mC/cm 2 . The memory tests showed that the transmittance in the colored state increased by 8% in 90 min after removing the potential.

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Nuclear magnetic resonance and conductivity study of HEC/polyether-based polymer electrolytes

Cited by 41 publications

References 23 publications

New solid polymer electrolytes based on PEO/PAN hybrids

New solid polymer electrolytes based on PEO/PAN hybrids

Conductivity studies of starch-based polymer electrolytes

Gelatin-based protonic electrolyte for electrochromic windows

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