In-situ polymerization gel electrolyte and preparation method and application thereof

The invention relates to the technical field of new energy batteries, in particular to an in-situ polymerization gel electrolyte and a preparation method and application thereof.The in-situ polymerization gel electrolyte comprises a lithium salt, an organic solvent, an additive, a cross-linking agent monomer and a thermal initiator, and the additive is phenyl fluorosulfonate. The preparation method comprises the following steps: dissolving a lithium salt, an additive, a cross-linking agent monomer and a thermal initiator in an organic solvent, uniformly stirring to obtain an in-situ polymerization gel electrolyte precursor solution, and initiating a cross-linking polymerization reaction under a heating condition to obtain the in-situ polymerization gel electrolyte. The in-situ polymerization gel electrolyte disclosed by the invention has relatively high ionic conductivity and relatively good lithium metal affinity, and can be used for preparing a high-cycle and high-safety quasi-solid negative-electrode-free