Ionic Bond and Hydrogen Bond Synergistic Endow Electrolytes Self‐Healing Ability for Lithium‐Ion Batteries

Self‐healing electrolytes can heal automatically when cracks occur during battery assembly or operation, improving the cycle life of lithium batteries. However, due to the weak self‐healing force, the current electrolyte healing speed is relatively slow. In this work, the double synergistic action of hydrogen bond and ionic bond is used to improve the healing speed of electrolytes. In addition, the introduction of ionic liquids imparts nonflammability to the electrolyte, greatly improving safety. At room temperature, the tensile ratio of the electrolyte reaches 300%, and the conductivity reaches 7.1 × 10 −4 S cm −1 . It has a wide electrochemical window (5.1 V) and good electrochemical performance with an initial discharge specific capacity of up to 139.3 mAh g −1 at 0.1 C using the LiFePO 4 cathode material.