期刊
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
卷 195, 期 -, 页码 74-83出版社
ELSEVIER
DOI: 10.1016/j.mseb.2015.02.003
关键词
Polymer electrolyte; Thermal analysis; Ion conduction mechanism; Impedance spectroscopy
资金
- Science and Technology Foundation of Shenzhen, China
Lithium ion conducting polymer electrolyte films based on biodegradable poly(epsilon-caprolactone) (PCL) complexed with lithium thiocyanate (LiSCN) salt were prepared by solution cast technique. Thermal and electrical properties of the polymer electrolyte films were studied using differential scanning calorimetry (DSC) and ac impedance spectroscopy. In order to investigate the ion conduction mechanism and relaxation behavior of complex polymer electrolyte films, the conductivity, dielectric constant, loss tangent and electric modulus were analyzed as a function of frequency and temperature. The variation of conductivity with frequency obeyed the Johnscher's power law. The dielectric constant exhibited a higher value at a lower frequency and increased with rising temperature due to the polar nature of host polymer. The activation energies for both dc conductivity and relaxation had the same value (similar to 0.87 eV), implying that the charge carriers responsible for both conduction and relaxation were the same. (c) 2015 Elsevier B.V. All rights reserved.
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