Enhanced electrochemical properties of nanocomposite polymer electrolyte based on copolymer with exfoliated clays

Wang, Mingkui; Dong, Shaojun

doi:10.1016/j.jpowsour.2007.04.031

Cited by 50 publications

(30 citation statements)

References 34 publications

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“…These values are also marked in the same Figure. These values are exactly equal to the tanδ peak frequency f EP . In complex impedance plane plots the extrapolated intercept on the real axis Z′ of the common part of two arcs gives the value of dc bulk resistance R dc , of the dielectric material [7,8,55]. It is observed that the R dc value of these materials decreases with the increase of MMT clay concentration, and hence the σ dc values increases.…”

Section: Complex Impedance Spectramentioning

confidence: 99%

Low frequency dielectric relaxation processes and ionic conductivity of montmorillonite clay nanoparticles colloidal suspension in poly(vinyl pyrrolidone)−ethylene glycol blends

Sengwa¹,

Choudhary²,

Sankhla³

2008

Express Polym. Lett.

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Section: Complex Impedance Spectramentioning

confidence: 99%

Low frequency dielectric relaxation processes and ionic conductivity of montmorillonite clay nanoparticles colloidal suspension in poly(vinyl pyrrolidone)−ethylene glycol blends

Sengwa¹,

Choudhary²,

Sankhla³

2008

Express Polym. Lett.

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“…Complex impedance spectroscopy is commonly used to separate the electrode polarization (EP) effect and bulk material properties, which is distinguished by the appearance of two different arcs in the complex impedance plane plots (Z″ vs. Z ′) [12,37,[38][39][40]. The EP phenomena occur due to formation of electric double layer (EDL) capacitances by the free charges that build up at the interface between the dielectric material and electrode surfaces in plane geometry.…”

Section: Impedance Spectramentioning

confidence: 99%

“…The single arc plots confirm that in the frequency range 20 Hz to 1 MHz, the PVA-MMT clay nanocomposites have good electrical contact with nickel-plated cobal electrodes and there is no formation of EDL capacitances. Further, the large values of imaginary part Z ″ as compared to real part Z′ of the complex impedance confirm a highly capacitive behaviour of these films [34,40]. …”

Section: Impedance Spectramentioning

confidence: 99%

Investigation of correlation between dielectric parameters and nanostructures in aqueous solution grown poly(vinyl alcohol)-montmorillonite clay nanocomposites by dielectric relaxation spectroscopy

Sengwa¹,

Choudhary²

2010

Express Polym. Lett.

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Abstract. Poly(vinyl alcohol) (PVA)-montmorillonite (MMT) clay nanocomposite films up to 10 wt% clay concentration were synthesized by aqueous solution grown technique. The relative complex dielectric function, alternating current electrical conductivity, electric modulus and impedance properties of these organic-inorganic nanocomposites were investigated in the frequency range from 20 Hz to 1 MHz at ambient temperature. The PVA-MMT clay nanocomposite films show a large decrease in the real part and loss of relative dielectric function at 1 wt% MMT clay loading compared to pure PVA film and anomalous behaviour is observed with further increase of clay concentration in PVA matrix. Two dielectric relaxation processes were observed in these nanocomposites; a high frequency relaxation associated with PVA segmental motion and a low frequency relaxation resulting from PVA/dispersed MMT clay interfacial polarization (Maxwell-Wagner relaxation). Dielectric relaxation times corresponding to these processes were determined by fitting dc conductivity corrected complex dielectric function data to the Havriliak-Negami expression. A correlation between change in dielectric relaxation strength, relaxation time and hindrance to the PVA-chain dynamics with the degree of exfoliated structures of dispersed nanoscale MMT clay filler in the PVA matrix were explored. Results confirm the application of dielectric relaxation spectroscopy as a potential tool in the confirmation of nanocomposite formation and their structure characterization.

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“…23 This behavior was often observed in the impedance response of PEO-type polymer electrolytes. 24,25 Hence, the resistance R b can be estimated from the impedance spectra at the point where the line intercepted the real part in the high-frequency region. The ionic conductivity was calculated using the following equation: where r is the ionic conductivity, d is the thickness of the polymer electrolyte, R b is the resistance of bulk electrolyte estimated from the Nyquist plot, and S is the area of the polished gold electrode.…”

Section: Peo/ppc (Wt %)mentioning

confidence: 99%

Fabrication and characterization of PEO/PPC polymer electrolyte for lithium‐ion battery

Xiao

Wang

et al. 2009

J of Applied Polymer Sci

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A new poly(propylene carbonate)/poly(ethylene oxide) (PEO/PPC) polymer electrolytes (PEs) have been developed by solution-casting technique using biodegradable PPC and PEO. The morphology, structure, and thermal properties of the PEO/PPC polymer electrolytes were investigated by scanning electron microscopy, X-ray diffraction, and differential scanning calorimetry methods. The ionic conductivity and the electrochemical stability window of the PEO/PPC polymer electrolytes were also measured. The results showed that the T g and the crystallinity of PEO decrease, and consequently, the ionic conductivity increases because of the addition of amorphous PPC. The PEO/50%PPC/10%LiClO 4 polymer electrolyte possesses good properties such as 6.83 Â 10 À5 S cm À1 of ionic conductivity at room temperature and 4.5 V of the electrochemical stability window.

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Enhanced electrochemical properties of nanocomposite polymer electrolyte based on copolymer with exfoliated clays

Cited by 50 publications

References 34 publications

Low frequency dielectric relaxation processes and ionic conductivity of montmorillonite clay nanoparticles colloidal suspension in poly(vinyl pyrrolidone)−ethylene glycol blends

Low frequency dielectric relaxation processes and ionic conductivity of montmorillonite clay nanoparticles colloidal suspension in poly(vinyl pyrrolidone)−ethylene glycol blends

Investigation of correlation between dielectric parameters and nanostructures in aqueous solution grown poly(vinyl alcohol)-montmorillonite clay nanocomposites by dielectric relaxation spectroscopy

Fabrication and characterization of PEO/PPC polymer electrolyte for lithium‐ion battery

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