Binder aqueous solution for lithium ion battery electrode, slurry for lithium ion battery negative electrode, negative electrode for lithium ion battery, and lithium ion battery

To provide a binder aqueous solution for lithium ion battery electrodes, a slurry for lithium ion battery negative electrodes, a negative electrode for lithium ion batteries, and a lithium ion battery. The present disclosure provides the binder aqueous solution for the lithium ion battery, the binder aqueous solution comprising an acidic group-containing water-soluble polymer (A) and an amino group-containing water-soluble polymer (B), the acidic group-containing water-soluble polymer (A) being a polymer of a monomer group and having a molecular weight of 100 mol% relative to the monomer group, the monomer group comprises 30-90 mol% of a (meth) acrylamide group-containing compound (a), 3-20 mol% of an unsaturated organic acid (b) and 5-40 mol% of an alkali metal or alkaline earth metal salt (c) of the unsaturated organic acid; the pH of a 1% by mass aqueous solution of the amino group-containing water-soluble polymer (B) is 9 or more. [技术问题]提供锂离子电池电极用粘合剂水溶液、锂离子电池负极用浆料、锂离子电池用负极及锂离子电池。[技术手段]本公开提供锂离子电池用粘合剂水溶液，所述