Enhanced performance of modified HDPE separators generated from surface enrichment of polyether chains for lithium ion secondary battery

► PEG chains were incorporated into PE separator via TIPS process. ► Affinity between separator and liquid electrolyte was efficiently improved. ► The ionic conductivity was up to 1.24×10−3 S cm−1 at 25 °C. ► Batteries containing modified separators behaved improved cycle performance. ► A promising way was inferred for high performance separator production.