Abstract
ABSTRACTSolid polyelectrolytes (SPEs) have garnered considerable attention and extensive research due to their exceptional flexibility, low cost, and ease of industrial production. This study synthesized bis‐imidazole cationic functionalized benzonorbornadiene block copolymers rP(NB‐MGE‐b‐BenzoNBD‐BisIm+TFSI−) via ring‐opening metathesis polymerization (ROMP). The block copolymers were blended with lithium trifluoromethanesulfonate (LiTFSI) and nano SiO2 to prepare the composite solid polyelectrolytes membrane (CSPEMs) rP(NB‐MGE‐b‐BenzoNBD‐BisIm+TFSI−)/LiTFSI/SiO2 by a solution casting method for applications in lithium‐ion batteries (LIBs). This research investigates the effect of different nano‐SiO2 content on the ionic conductivity and electrochemical stability of the composite SPEs. The relationship between the intrinsic structure and properties of rP(NB‐MGE‐b‐BenzoNBD‐BisIm+TFSI−)/LiTFSI/z wt% SiO2 (z = 0, 2.5, 5.0, 7.5) was studied. When the SiO2 content is 5.0 wt%, the maximum ionic conductivity reaches 9.3 × 10−5 S cm−1 at 30°C and 1.5 × 10−3 S cm−1 at 80°C. The NCM811/CSPEM/Li battery exhibits an initial reversible discharge capacity of 149.7 mAh g−1 at a current density of 0.2 C, with a coulombic efficiency maintained above 96%. After 50 cycles at a current density of 0.2 C, the capacity remains at 148.9 ± 8 mAh g−1, with the coulombic efficiency continuing to exceed 96%, which demonstrating robust cycling stability.
Published Version
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