Understanding the ion dynamics and relaxation behavior from impedance spectroscopy of NaI doped Zwitterionic polymer system

作者：Kumar Manindra^*; Tiwari Tuhina; Chauhan Jagdish Kumar; Srivastava Neelam

来源：Materials Research Express, 2014, 1(4): 045003.

DOI：10.1088/2053-1591/1/4/045003

• polymer electrolyte
• relaxation time
• conductivity power law
• ion dynamics
• scaling

The ion dynamics and relaxation behavior of a novel polymer electrolyte system is studied by presenting impedance spectroscopy data in a different formalism. The prepared system has conductivity of the order of 10(-3) Scm(-1) at 303 K, and the RH %= 55. Depressed Nyquist plots and broadened M %26apos;%26apos; curves (as a function of.) indicated the distribution of the relaxation time, which is further confirmed by the fractional value of the Kohlrausch-William-Watts (KWW) beta similar to 0.75). The hopping and caged movement of the ions are observed in the experimental frequency range (similar to MHz), which is confirmed by the conductivity and dielectric representations. The scaling of the conductivity data, with reference to salt concentration and temperature, are successfully observed by fitting the conductivity data exclusively in the Jonscher Power Law (JPL) region. An inverse relation between tau(con) and sigma indicated a strong correlation between the ion and polymer segment motion. An additional high frequency relaxation phenomenon is observed at 50% of the salt concentration, which is correlated with the self-diffusion of the ion and proposed that such phenomenon is observed when ions have multiplet forming tendency.

• 出版日期2014-12