Ac Conductivity and Dielectric Properties of Hexanoyl Chitosan-LiClO4-TiO2 Composite Polymer Electrolytes

Hexanoyl chitosan: LiClO4: TiO2composite electrolyte films were prepared by the solution cast technique. The ac conductivity and dielectric properties of the samples prepared have been studied in the frequency range from 100 Hz to 1 MHz over the temperature range from 273 to 333 K. The exponent s in the Jonscher’s universal power law, σ(ω)=σdc+Aωswas analyzed as a function of temperature and the analysis suggests that the conduction mechanism can be interpreted based on the correlated barrier hopping (CBH) model. The barrier heights, WMwere calculated. The values of WMare found to decrease with increasing temperature in the same manner as the exponent s. Both dielectric constant and dielectric loss decrease with increase in frequency and increase with increase in temperature.

Download Full-text

Ac Conductivity Study of Hexanoyl Chitosan-LiCF3SO3-EC-Al2O3 Nanocomposite Polymer Electrolytes

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.667.93 ◽

2013 ◽

Vol 667 ◽

pp. 93-98 ◽

Cited By ~ 1

Author(s):

Tan Winie ◽

Nur Shazlinda Muhammad Hanif ◽

Nurul Hazwani Aminuddin Rosli ◽

Ri Hanum Yahaya Subban

Keyword(s):

Ac Conductivity ◽

Electrolyte System ◽

Casting Technique ◽

Nanocomposite Polymer ◽

Hexanoyl Chitosan ◽

Universal Power Law ◽

Solution Casting Technique ◽

Nanocomposite Electrolyte ◽

Power Law Equation ◽

Increasing Temperature

Films of hexanoyl chitosan-based polymer electrolyte were prepared by solution casting technique. LiCF3SO3, EC and Al2O3 were employed as the doping salt, plasticizer and filler, respectively. The ac conductivity of the electrolyte system under investigation has been studied in the frequency range from 100 Hz to 1 MHz over the temperature range from 273 K to 333 K. The exponent s in the Jonscher’s universal power law equation was analyzed as a function of temperature. The analysis suggests that the conduction mechanism for the nanocomposite electrolyte system can be interpreted based on the correlated barrier hopping (CBH) model. The ac parameters such as the barrier height, WM and cut-off hopping distance, Rmin were calculated. The values of WM and Rmin are found to decrease with increasing temperature in the same manner as the exponent s.

Download Full-text

Dielectric Properties, AC Conductivity, and Electric Modulus Analysis of Bulk Ethylcarbazole-Terphenyl

Advances in Materials Science and Engineering ◽

10.1155/2020/8689150 ◽

2020 ◽

Vol 2020 ◽

pp. 1-8 ◽

Cited By ~ 2

Author(s):

Hussam Bouaamlat ◽

Nasr Hadi ◽

Najat Belghiti ◽

Hayat Sadki ◽

Mohammed Naciri Bennani ◽

...

Keyword(s):

Dielectric Properties ◽

Ac Conductivity ◽

Conduction Mechanism ◽

Electric Modulus ◽

X Ray Diffraction ◽

X Ray ◽

Universal Power Law ◽

Electrical And Dielectric Properties ◽

Increasing Temperature ◽

Hopping Model

Electrical and dielectric properties for bulk ethylcarbazole-terphenyl (PEcbz-Ter) have been studied over frequency range 1 kHz–2 MHz and temperature range (R.T –120°C). The copolymer PEcbz-Ter was characterised by using X-ray diffraction. The frequency dependence of the dielectric constant (εr′) and dielectric loss (εr″) has been investigated using the complex permittivity. εr′ of the copolymer decreases with increasing frequency and increases with temperature. AC conductivity (σac) data were analysed by the universal power law. The behaviour of σac increases with increasing temperature and frequency. The change of the frequency exponent (s) with temperature was analysed in terms of different conduction mechanisms, and it was found that the correlated barrier-hopping model is the predominant conduction mechanism. The electric modulus was used to analyze the relaxation phenomenon in the material.

Download Full-text

Hexanoyl Chitosan-Polystyrene Blend Based Composite Polymer Electrolyte with Surface Treated TiO2 Fillers

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.594-595.656 ◽

2013 ◽

Vol 594-595 ◽

pp. 656-660

Author(s):

Tan Winie ◽

Asheila Jamal ◽

Nur Shazlinda Muhammad Hanif ◽

N.S.M. Shahril

Keyword(s):

Polymer Electrolytes ◽

Composite Polymer Electrolyte ◽

Composite Polymer ◽

X Ray Diffraction ◽

Composite Polymer Electrolytes ◽

X Ray ◽

Casting Technique ◽

Hexanoyl Chitosan ◽

Solution Casting Technique ◽

Increasing Temperature

Composite polymer electrolytes (CPEs) comprised of hexanoyl chitosan-polystyrene-LiCF3SO3-TiO2 were prepared by solution casting technique. The TiO2 fillers were treated with 4% sulphuric acid (H2SO4) aqueous solution. The effect of treated TiO2 on the structural and electrical behaviour of the prepared electrolyte systems was investigated by X-ray diffraction (XRD) and impedance spectroscopy, respectively. Addition of TiO2 decreases the crystallinity of the electrolytes. Ac conductivity was calculated from σ(ω) = εoεrωtanδ. It is found that at all frequencies, σ(ω) increases with increasing temperature. Dielectric constant decreases with increasing frequency and increases with increasing temperature.

Download Full-text

Effect of H2SO4 Treated TiO2 Nano Fillers on the AC Conductivity of Hexanoyl Chitosan-Polystyrene-LiCF3SO3 Polymer Electrolytes

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.832.228 ◽

2013 ◽

Vol 832 ◽

pp. 228-232

Author(s):

Tan Winie ◽

Nur Syuhada Mohd Shahril ◽

Nur Shazlinda Muhammad Hanif ◽

Ri Hanum Yahaya Subban ◽

Chin Han Chan

Keyword(s):

Power Law ◽

Polymer Electrolytes ◽

Ac Conductivity ◽

Theoretical Models ◽

Angular Frequency ◽

Casting Technique ◽

Hexanoyl Chitosan ◽

Universal Power Law ◽

Power Law Exponent ◽

Solution Casting Technique

Hexanoyl chitosan exhibited solubility in tetrahydrofuran (THF) was prepared by acyl modification of chitosan. Polystyrene with molecular weight 280,000 g mol-1 was chosen to blend with hexanoyl chitosan. LiCF3SO3 was employed as the doping salt. Untreated and H2SO4 treated TiO2 was added as the filler. Films of hexanoyl chitosan-polystyrene-LiCF3SO3-TiO2 polymer electrolyte were obtained by solution casting technique. The ac conductivity of the sample was calculated from the relation σac = εoεiω, where εo is the permittivity of the free space, the angular frequency, ω=2πf, and εi is the dielectric loss. The ac conductivity dispersion observed is analyzed using the Jonshers universal power law, σ (ω) = σdc + Aωn where A is a pre-exponential constant and n is the power law exponent with value in the range 0 < n < 1. The temperature dependence of exponent n will then be interpreted using the existing theoretical models.

Download Full-text

Ac conductivity and dielectric properties of bulk tin phthalocyanine dichloride (SnPcCl2)

Physica B Condensed Matter ◽

10.1016/j.physb.2007.12.015 ◽

2008 ◽

Vol 403 (13-16) ◽

pp. 2331-2337 ◽

Cited By ~ 31

Author(s):

M.M. El-Nahass ◽

A.M. Farid ◽

K.F. Abd El-Rahman ◽

H.A.M. Ali

Keyword(s):

Dielectric Properties ◽

Ac Conductivity

Download Full-text

Excellent Performances of Composite Polymer Electrolytes with Porous Vinyl-Functionalized SiO2 Nanoparticles for Lithium Metal Batteries

Polymers ◽

10.3390/polym13152468 ◽

2021 ◽

Vol 13 (15) ◽

pp. 2468

Author(s):

Hui Zhan ◽

Mengjun Wu ◽

Rui Wang ◽

Shuohao Wu ◽

Hao Li ◽

...

Keyword(s):

Polymer Electrolytes ◽

Specific Capacity ◽

Sio2 Nanoparticles ◽

Inorganic Materials ◽

Solid Polymer Electrolytes ◽

Lithium Metal ◽

Composite Polymer ◽

Composite Electrolyte ◽

Composite Polymer Electrolytes ◽

Lithium Metal Batteries

Composite polymer electrolytes (CPEs) incorporate the advantages of solid polymer electrolytes (SPEs) and inorganic solid electrolytes (ISEs), which have shown huge potential in the application of safe lithium-metal batteries (LMBs). Effectively avoiding the agglomeration of inorganic fillers in the polymer matrix during the organic–inorganic mixing process is very important for the properties of the composite electrolyte. Herein, a partial cross-linked PEO-based CPE was prepared by porous vinyl-functionalized silicon (p-V-SiO2) nanoparticles as fillers and poly (ethylene glycol diacrylate) (PEGDA) as cross-linkers. By combining the mechanical rigidity of ceramic fillers and the flexibility of PEO, the as-made electrolyte membranes had excellent mechanical properties. The big special surface area and pore volume of nanoparticles inhibited PEO recrystallization and promoted the dissolution of lithium salt. Chemical bonding improved the interfacial compatibility between organic and inorganic materials and facilitated the homogenization of lithium-ion flow. As a result, the symmetric Li|CPE|Li cells could operate stably over 450 h without a short circuit. All solid Li|LiFePO4 batteries were constructed with this composite electrolyte and showed excellent rate and cycling performances. The first discharge-specific capacity of the assembled battery was 155.1 mA h g−1, and the capacity retention was 91% after operating for 300 cycles at 0.5 C. These results demonstrated that the chemical grafting of porous inorganic materials and cross-linking polymerization can greatly improve the properties of CPEs.

Download Full-text