Preparation method of bipolar membrane with high lithium-ion rejection rate

The invention discloses a preparation method of a bipolar membrane with high lithium-ion rejection rate. The preparation method of the bipolar membrane with the high lithium-ion rejection rate includes the steps: basal membrane preparation of the bipolar membrane; positive surface synthesis of a basal membrane; negative surface synthesis of the basal membrane; post-treatment. The preparation method particularly includes the steps: performing surface activation on a polyether ether ketone membrane, and performing benzodiazepine reaction and polymerization reaction to form the basal membrane; sequentially soaking the prepared basal membrane into sulfuric acid and chloroprene ether to form the basal membrane with a positive surface and a negative surface; inserting the basal membrane with thepositive surface and the negative surface into an electrolytic cell of sodium chloride solution with metaphenylene diamine, and forming the bipolar membrane after powering on; sequentially soaking the acquired bipolar membra