Electrochemical and Rheological Studies of Single-ion Conducting Gel Polymer Electrolytes Containing Zwitterions for Lithium Metal Batteries
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A lithium metal battery (LMB) has been drawing attention as a promising energy storage system. Despite of the advantages, there are significant challenges for their applications. One prominent strategy to overcome the drawbacks is to develop single-ion conducting gel polymer electrolytes (SIGPEs). Herein, we prepared a series of cross-linked SIGPEs based on lithium (cyano)(4-stytrenesulfonyl)amide and 3-(1-vinyl-3-imidazolio)propanesulfonate as weak-binding ionic monomers, and high-dipole zwitterionic monomers. The effect of monomer type and content on the electrical and mechanical properties was investigated using EIS and oscillatory shear measurements. Then, the SIGPE physical properties could be adjusted according to the ratio of each component. As a result, the highest ionic conductivity observed in SIGPEs was 4×10-4 S cm-1 at 298K. Besides, the highest shear storage modulus of SIGPEs was 2×105 Pa at 298K. This assessment of the conductivity and rheological characteristics of the SIGPEs could serve as a guide for designing SIGPE-based LMBs.