NMR and Conductivity Study of Gelatin-Based Polymer Electrolytes

Abstract

Nuclear Magnetic Resonance spectroscopy (NMR) and complex impedance spectroscopy have been used to study gelatin-based polymer electrolytes plasticized with glycerol and containing lithium perchlorate. The studied samples were prepared with salt concentration of 7.9 wt% and 10.3 wt%. Ionic conductivity of about 10⁻⁵ S/cm was obtained at room temperature for both samples. Lithium (⁷Li) and proton (¹H) lineshapes and spin-lattice relaxation times were measured as a function of temperature. The ⁷Li NMR relaxation results indicate that the ionic mobility in this system is comparable to those found in other plasticized polymer electrolytes.

Keywords:

• conductivity
• gelatin
• gel electrolyte
• NMR
• polymer electrolyte

Acknowledgments

The authors would like to acknowledge the financial support given by the Brazilian agencies Capes, CNPq and FAPESP. This work is also part of a PRONEX/FAPESP/CNPq (Grant no 03/09859-2) joint program.