Trapping Anions to Govern the Li⁺ Local Coordination Environment for a Highly Li⁺ Conductive Solid Polymer Electrolyte

High Resolution Image Download MS PowerPoint Slide Solid polymer electrolytes (SPEs) confront the major challenge of low ionic conductivity. The Li + local coordination environment in SPEs affects the ionic conductivity. Herein, a highly ionic conductive SPE is designed and experimentally realized via governing the Li + local coordination environment through 4-acetylphenylboronic acid (APBA). The –OH functional groups in APBA react with F atoms in the PVDF-HFP polymer chain segment and O atoms in TFSI – to form the OH···F hydrogen bond and the OH···O hydrogen bond. This weakens the Li + local coordination with PVDF-HFP and TFSI –, facilitating more free-Li + release and strengthening the molecular dynamics of Li + . This variation results in the greatly increased Li + ionic conductivity from 0.63 × 10 –4 to 2.39 × 10 –4 S/cm of SPE with APBA at 25 °C. This electrolyte makes the symmetric cells full cells with promising electrochemical performance. The strategy provided here is helpful for the development of highly ionic conductive SPEs.