Preserving fast ion dynamics while introducing mechanical rigidity in gelatin-based ionogels.

Area of Science:

• Materials Science
• Electrochemistry
• Physical Chemistry

Background:

• Ionogels, combining ionic liquids and gelling agents, offer chemical stability and ionic conductivity for energy applications.
• Traditional ionogels can be expensive; gelatin presents a low-cost alternative gelling agent.

Purpose of the Study:

• To develop and characterize a thermo-irreversible ionogel using 1-butyl-3-methylimidazolium dicyanamide ([BMIM][DCA]), water, and gelatin.
• To investigate the relationship between microscopic ion dynamics and macroscopic mechanical properties of the ionogel.

Main Methods:

• Dielectric spectroscopy to analyze ion transport.
• Dynamic light scattering to study ion reorientational motions and gel matrix fluctuations.
• Rheology to determine the shear response across temperatures.

Main Results:

• The ionogel exhibits thermo-irreversible behavior.
• Ion dynamics in the ionogel are largely unaffected by the gelatin matrix, showing only minor additional slow relaxation modes.
• Macroscopic mechanical properties are dominated by the gelatin gel matrix.

Conclusions:

• The developed gelatin-based ionogel successfully integrates the benefits of ionic liquids with the low cost and mechanical properties of gelatin.
• This material is promising for applications like gel electrolytes in batteries, offering mechanical integrity and flexibility while preventing leakage.