Abstract：In order to solve the key problems of elastomeric solid electrolytes for flexible electronic equipment, specifically the balance between mechanical property and ion transport performance and interface stability, isophorone diisocyanate (IPDI) and polycarbonate diol (PCDL) modified elastomeric solid electrolyte were prepared in this paper. Through microscopic characterization, mechanical and electrochemical performance tests, the regulation mode and coupling mechanism of modified components on electrolytes were systematically explored. The results show that IPDI forms a three-dimensional network through covalent crosslinking, thereby enhancing the strength and stability of the electrolyte. However, the increase of crosslinking density will limit the segment motion, increase the ion impedance, and narrow the electrochemical stability window. PCDL destroys the ordered stacking of segments through flexible plasticization, expands the amorphous region, and significantly enhances toughness and ionic conductivity. However, too much PCDL will lead to a slight increase in impedance due to segment winding. In addition, the study also reveals the coupling mechanism of synergistic regulation of mechanical-electrochemical properties by crosslinking enhancement and flexible plasticization, which provides a clear regulatory framework for the synergistic optimization of mechanical and electrochemical properties in elastomeric solid electrolytes.
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