Preparation method of gel polymer lithium ion battery

The invention discloses a preparation method of a gel polymer lithium ion battery. The preparation method is characterized by comprising the following steps of step A: pre-polymerization of a gel polymer electrolyte, step B: preparation of the gel polymer electrolyte, and step C, preparation of the gel polymer lithium ion battery. The method has the advantages that the pre-polymerization stage ofthe gel polymer electrolyte is carried out under full stirring and long-time heating reaction, and an initiator is added in the post period, so that the conversion rate of monomers reaches a very highlevel; by virtue of co-polymerization with a functional monomer containing a carboxyl group or a hydroxyl group, a linear polymer with a reactive group on one side is synthesized; the linear polymeris subjected to heat reaction with a cross-linking agent to form a chemical bond cross-linked gel, so that the problem of battery performance deterioration caused by low monomer conversion rate of a previous chemical crosslinki