Molecular Weight Blending of Poly(ethylene succinate) for Enhanced Performance of Solid Polymer Electrolytes

Solid polymer electrolytes (SPEs) based on biodegradable polyesters present a promising alternative to conventional polymers, yet their ionic conductivity remains a challenge. Herein, we propose a molecular weight blending strategy to fabricate high-performance SPEs using poly(ethylene succinate) (PES). By incorporating low-molecular-weight PES10k (10 kg·mol–1) into a high-molecular-weight PES104k (104 kg·mol–1), we synergistically enhance segmental mobility for ion transport while maintaining m