Dipole-Oriented Supramolecular Engineering of Polyester Solid Polymer Electrolytes for High Lithium-Ion Conductivity
발표자
송현준 (성균관대학교)
연구책임자
유필진 (성균관대학교)
공동저자
송현준 (성균관대학교), 유필진 (성균관대학교)
초록
내용
We report a supramolecular strategy to overcome the intrinsic conductivity constraints of polyester-based SPEs by integrating para-phenylenediamine (pPD) as a hydrogen-bonding and anion-trapping motif. A family of six polyesters was synthesized and complexed with pPD, yielding SPEs with enhanced lithium-ion transport and mechanical integrity. The pPD units immobilize TFSI⁻ anions, increasing the lithium-ion transference number by ~20%. Remarkably, conductivity enhancement strongly depends on the orientation of adjacent carbonyl dipoles within the polymer backbone. Polyesters with parallel dipole alignment exhibit over twofold increases in ionic conductivity, whereas those with anti-parallel alignment show negligible improvement. Among them, poly(n-pentyl malonate)–pPD achieves 1.094 mS cm⁻¹ at 80 °C and a lithium-ion conductivity of 0.816 mS cm⁻¹, representing 296% and 357% enhancements, respectively.