Hydrostatic pressure effect on complex impedance spectra and dielectric constant of solid electrolyte of high - polymer P(EO)n - CuBr2

作者：Su F^*; Xie B; Wang W

来源：Acta Polymerica Sinica, 1996, (6): 658-659.

• Complex impedance spectrum
• Dielectric constant
• Hydrostatic pressure
• Ionic conductivity
• Solid polymer electrolytes

By adding different weight of CuBr2 (ratio n=[EO] /[Cu]=24, 16, 12, 8, 4) in Polyoxyethylene (molecular weight = 5 × 106), we prepared a series of high polymer film of solid electrolyte P(EO)n-CuBr2 with the method of mixed solution and evaporation in vacuum. Their complex impedance spectra were measured in detail at different hydrostatic pressure in the range from 0.1 MPa to 300MPa. Through further spectra decomposition the dependence of ionic conductivity (or dielectric constant) on measuring frequency under different pressure was obtained respectively. As a result of spectra analysis, the variation of ionic conductivity and dielectric constant with hydrostatic pressure in P(EO)n-CuBr2 film was calculated precisely. On the basis of X - Ray diffraction, above mentioned pressure effects were discussed tentatively according to the physical picture of ionic transport-passage and polarization mechanism of high polymer. Adding the plasticizers, propylene carbonate with concentration of mol. ratio npc/ntotal= 20 can enhance ionic conductivity under 120 - 300MPa one order of magnitude.

• 出版日期1996
• 单位中国科学技术大学