▎ 摘　　要

NOVELTY - Preparing fast ion conductor based on in-situ solidification, comprises (i) mixing 15-30 pts. wt. high steric hindrance monomer and 5-10 pts. wt. cross-linking agent, removing water through molecular sieve, adding 5-10 pts. wt. lithium salt, mixing evenly, and storing the obtained mixed solution A at 2-8 ℃, (ii) mixing 0.04-0.12 pts. wt. initiator and 49.96-79.88 pts. wt. plasticizer, stirring for 30-120 minutes to mix evenly to obtain mixed liquid B, (iii) mixing the mixed solution A in step (i) and the mixed solution B in step (ii), and stirring evenly to obtain solidified precursor solution, and (iv) injecting curing precursor solution into the cell having porous skeleton membrane, adding 10-35 µl per 1 cm2, and curing in situ at a temperature of 30-80 ℃ for 0.5-48 hours to obtain solid polymer fast ion conductor. USE - The fast ion conductor is useful in lithium secondary battery (claimed). ADVANTAGE - The method: utilizes the high space steric hindrance monomer and high activity cross-linking agent to co-polymerize, and improves ion conductivity; utilizes the three-dimensional network structure which has mechanical strength and stable electrode electrolyte interface property; and has improved ionic conductivity, mechanical strength, and interface stability.