Single‐Ion‐Conducting Hydrogel Electrolytes Based on Slide‐Ring Pseudo‐Polyrotaxane for Ultralong‐Cycling Flexible Zinc‐Ion Batteries

Abstract Flexible zinc‐ion batteries (ZIBs) with high capacity and long cycle stability are essential for wearable electronic devices. Hydrogel electrolytes have been developed to provide ion‐transfer channels while maintaining the integrity of ZIBs under mechanical strain. However, hydrogel matrices are typically swollen with aqueous salt solutions to increase ionic conductivity, which can hinder intimate contact with electrodes and reduce mechanical properties. To address this, a single‐Zn‐ion‐conducting hydrogel electrolyte (SIHE) is developed by integrating polyacrylamide network and pseudo‐polyrotaxane structure. The SIHE exhibits a high Zn 2+ transference number of 0.923 and a high ionic conductivity of…

• NN
  National Natural Science Foundation of China

  Award: 52250010
• CS
  China Scholarship Council

  Award: 202206090249
• NK
  National Key Research and Development Program of China

  Award: 2021YFF0500301
• FR
  Fundamental Research Funds for the Central Universities

  Award: 2242023K40027