▎ 摘　　要

NOVELTY - A ethynyl benzene-based crosslinking precursor (I), is new. USE - New ethynyl benzene-based crosslinking precursor used for copolymer of gel polymer electrolyte used in electrochemical device (all claimed). Uses include but are not limited to lithium primary battery, lithium secondary battery, lithium-sulfur battery, lithium-air battery, sodium battery, aluminum battery, magnesium battery, calcium battery, zinc battery, lead-acid battery, etc. ADVANTAGE - The ethynyl benzene-based crosslinking precursor provides gel polymer electrolyte exhibiting single ion conducting, excellent hydrophilicity, hydrophobicity, amphiphilic property, performance, maximizing safety when applied to a lithium ion battery or sodium ion battery and having excellent ionic conductivity, electrochemical stability, thermal stability, mechanical strength, mechanical stability and improved ion conductivity. DETAILED DESCRIPTION - A ethynyl benzene-based crosslinking precursor of formula (I), is new. R=30-100C polyalkylene oxide. INDEPENDENT CLAIMS are included for the following: copolymer, which comprises the crosslinking precursor (I), a cation exchange monomer of formula (II), and optionally a polymerization initiator prepared by thermal polymerization or photopolymerization of a composition; and gel polymer electrolyte, which comprises the copolymer, and a non-aqueous solvent as a plasticizer.